Sync libwebp sources with https://chromium.googlesource.com/webm/libwebp/+/v1.0.0

86 files changed, 3796 insertions, 2250 deletions

diff --git a/media/libwebp/AUTHORS b/media/libwebp/AUTHORS
index b6e9cfb89c..83c7b9c5eb 100644
--- a/media/libwebp/AUTHORS
+++ b/media/libwebp/AUTHORS
@@ -35,4 +35,5 @@ Contributors:
 - Urvang Joshi (urvang at google dot com)
 - Vikas Arora (vikasa at google dot com)
 - Vincent Rabaud (vrabaud at google dot com)
+- Vlad Tsyrklevich (vtsyrklevich at chromium dot org)
 - Yang Zhang (yang dot zhang at arm dot com)
diff --git a/media/libwebp/NEWS b/media/libwebp/NEWS
index 3bf4bd0529..480cb7d34c 100644
--- a/media/libwebp/NEWS
+++ b/media/libwebp/NEWS
@@ -1,3 +1,26 @@
+- 4/2/2018: version 1.0.0
+  This is a binary compatible release.
+  * lossy encoder improvements to avoid chroma shifts in various circumstances
+    (issues #308, #340)
+  * big-endian fixes for decode, RGBA import and WebPPictureDistortion
+  Tool updates:
+    gifwebp, anim_diff - default duration behavior (<= 10ms) changed to match
+                         web browsers, transcoding tools (issue #379)
+    img2webp, webpmux - allow options to be passed in via a file (issue #355)
+
+- 11/24/2017: version 0.6.1
+  This is a binary compatible release.
+  * lossless performance and compression improvements + a new 'cruncher' mode
+    (-m 6 -q 100)
+  * ARM performance improvements with clang (15-20% w/ndk r15c, issue #339)
+  * webp-js: emscripten/webassembly based javascript decoder
+  * miscellaneous bug & build fixes (issue #329, #332, #343, #353, #360, #361,
+    #363)
+  Tool updates / additions:
+    added webpinfo - prints file format information (issue #330)
+    gif2webp - loop behavior modified to match Chrome M63+ (crbug.com/649264);
+               '-loop_compatibility' can be used for the old behavior
+
 - 1/26/2017: version 0.6.0
   * lossless performance and compression improvements
   * miscellaneous performance improvements (SSE2, NEON, MSA)
diff --git a/media/libwebp/README b/media/libwebp/README
index 4c15c4ad87..a76b3787f3 100644
--- a/media/libwebp/README
+++ b/media/libwebp/README
@@ -4,7 +4,7 @@
           \__\__/\____/\_____/__/ ____  ___
                 / _/ /    \    \ /  _ \/ _/
                /  \_/   / /   \ \   __/  \__
-               \____/____/\_____/_____/____/v0.6.0
+               \____/____/\_____/_____/____/v1.0.0
 
 Description:
 ============
@@ -113,8 +113,8 @@ make install
 
 CMake:
 ------
-The support for CMake is minimal: it only helps you compile libwebp, cwebp and
-dwebp.
+With CMake, you can compile libwebp, cwebp, dwebp, gif2web, img2webp, webpinfo
+and the JS bindings.
 
 Prerequisites:
 A compiler (e.g., gcc with autotools) and CMake.
@@ -123,18 +123,25 @@ minimal build:
 $ sudo apt-get install build-essential cmake
 
 When building from git sources, you will need to run cmake to generate the
-configure script.
+makefiles.
 
 mkdir build && cd build && cmake ../
 make
 make install
 
-If you also want cwebp or dwebp, you will need to enable them through CMake:
+If you also want any of the executables, you will need to enable them through
+CMake, e.g.:
 
 cmake -DWEBP_BUILD_CWEBP=ON -DWEBP_BUILD_DWEBP=ON ../
 
 or through your favorite interface (like ccmake or cmake-qt-gui).
 
+Finally, once installed, you can also use WebP in your CMake project by doing:
+
+find_package(WebP)
+
+which will define the CMake variables WebP_INCLUDE_DIRS and WebP_LIBRARIES.
+
 Gradle:
 -------
 The support for Gradle is minimal: it only helps you compile libwebp, cwebp and
@@ -360,6 +367,23 @@ Use following options to convert into alternate image formats:
   -quiet ....... quiet mode, don't print anything
   -noasm ....... disable all assembly optimizations
 
+WebP file analysis tool:
+========================
+
+'webpinfo' can be used to print out the chunk level structure and bitstream
+header information of WebP files. It can also check if the files are of valid
+WebP format.
+
+Usage: webpinfo [options] in_files
+Note: there could be multiple input files;
+      options must come before input files.
+Options:
+  -version ........... Print version number and exit.
+  -quiet ............. Do not show chunk parsing information.
+  -diag .............. Show parsing error diagnosis.
+  -summary ........... Show chunk stats summary.
+  -bitstream_info .... Parse bitstream header.
+
 Visualization tool:
 ===================
 
@@ -434,6 +458,7 @@ File-level options (only used at the start of compression):
  -mixed ............... use mixed lossy/lossless automatic mode
  -v ................... verbose mode
  -h ................... this help
+ -version ............. print version number and exit
 
 Per-frame options (only used for subsequent images input):
  -d <int> ............. frame duration in ms (default: 100)
@@ -470,6 +495,8 @@ Options:
   -metadata <string> ..... comma separated list of metadata to
                            copy from the input to the output if present
                            Valid values: all, none, icc, xmp (default)
+  -loop_compatibility .... use compatibility mode for Chrome
+                           version prior to M62 (inclusive)
   -mt .................... use multi-threading if available
 
   -version ............... print version number and exit
@@ -498,6 +525,11 @@ Options:
   -min_psnr <float> ... minimum per-frame PSNR
   -raw_comparison ..... if this flag is not used, RGB is
                         premultiplied before comparison
+  -max_diff <int> ..... maximum allowed difference per channel
+                        between corresponding pixels in subsequent
+                        frames
+  -h .................. this help
+  -version ............ print version number and exit
 
 Building:
 ---------
diff --git a/media/libwebp/README.mux b/media/libwebp/README.mux
index 04fedd163b..bd4f92fa36 100644
--- a/media/libwebp/README.mux
+++ b/media/libwebp/README.mux
@@ -1,7 +1,7 @@
           __   __  ____  ____  ____  __ __  _     __ __
          /  \\/  \/  _ \/  _ \/  _ \/  \  \/ \___/_ / _\
          \       /   __/  _  \   __/      /  /  (_/  /__
-          \__\__/\_____/_____/__/  \__//_/\_____/__/___/v0.4.0
+          \__\__/\_____/_____/__/  \__//_/\_____/__/___/v1.0.0
 
 
 Description:
@@ -33,6 +33,7 @@ Usage: webpmux -get GET_OPTIONS INPUT -o OUTPUT
        webpmux -info INPUT
        webpmux [-h|-help]
        webpmux -version
+       webpmux argument_file_name
 
 GET_OPTIONS:
  Extract relevant data:
@@ -92,6 +93,9 @@ INPUT & OUTPUT are in WebP format.
 Note: The nature of EXIF, XMP and ICC data is not checked and is assumed to be
 valid.
 
+Note: if a single file name is passed as the argument, the arguments will be
+tokenized from this file. The file name must not start with the character '-'.
+
 Visualization tool:
 ===================
 
diff --git a/media/libwebp/dec/alpha_dec.c b/media/libwebp/dec/alpha_dec.c
index 83ffd4b609..1ff7c62d8b 100644
--- a/media/libwebp/dec/alpha_dec.c
+++ b/media/libwebp/dec/alpha_dec.c
@@ -12,9 +12,9 @@
 // Author: Skal (pascal.massimino@gmail.com)
 
 #include <stdlib.h>
-#include "./alphai_dec.h"
-#include "./vp8i_dec.h"
-#include "./vp8li_dec.h"
+#include "../dec/alphai_dec.h"
+#include "../dec/vp8i_dec.h"
+#include "../dec/vp8li_dec.h"
 #include "../dsp/dsp.h"
 #include "../utils/quant_levels_dec_utils.h"
 #include "../utils/utils.h"
diff --git a/media/libwebp/dec/alphai_dec.h b/media/libwebp/dec/alphai_dec.h
index 561e8151ee..3b40691b54 100644
--- a/media/libwebp/dec/alphai_dec.h
+++ b/media/libwebp/dec/alphai_dec.h
@@ -11,10 +11,10 @@
 //
 // Author: Urvang (urvang@google.com)
 
-#ifndef WEBP_DEC_ALPHAI_H_
-#define WEBP_DEC_ALPHAI_H_
+#ifndef WEBP_DEC_ALPHAI_DEC_H_
+#define WEBP_DEC_ALPHAI_DEC_H_
 
-#include "./webpi_dec.h"
+#include "../dec/webpi_dec.h"
 #include "../utils/filters_utils.h"
 
 #ifdef __cplusplus
@@ -51,4 +51,4 @@ void WebPDeallocateAlphaMemory(VP8Decoder* const dec);
 }    // extern "C"
 #endif
 
-#endif  /* WEBP_DEC_ALPHAI_H_ */
+#endif  /* WEBP_DEC_ALPHAI_DEC_H_ */
diff --git a/media/libwebp/dec/buffer_dec.c b/media/libwebp/dec/buffer_dec.c
index c685fd5646..c7565c1bf5 100644
--- a/media/libwebp/dec/buffer_dec.c
+++ b/media/libwebp/dec/buffer_dec.c
@@ -13,15 +13,15 @@
 
 #include <stdlib.h>
 
-#include "./vp8i_dec.h"
-#include "./webpi_dec.h"
+#include "../dec/vp8i_dec.h"
+#include "../dec/webpi_dec.h"
 #include "../utils/utils.h"
 
 //------------------------------------------------------------------------------
 // WebPDecBuffer
 
 // Number of bytes per pixel for the different color-spaces.
-static const int kModeBpp[MODE_LAST] = {
+static const uint8_t kModeBpp[MODE_LAST] = {
   3, 4, 3, 4, 4, 2, 2,
   4, 4, 4, 2,    // pre-multiplied modes
   1, 1 };
@@ -36,7 +36,7 @@ static int IsValidColorspace(int webp_csp_mode) {
 // strictly speaking, the very last (or first, if flipped) row
 // doesn't require padding.
 #define MIN_BUFFER_SIZE(WIDTH, HEIGHT, STRIDE)       \
-    (uint64_t)(STRIDE) * ((HEIGHT) - 1) + (WIDTH)
+    ((uint64_t)(STRIDE) * ((HEIGHT) - 1) + (WIDTH))
 
 static VP8StatusCode CheckDecBuffer(const WebPDecBuffer* const buffer) {
   int ok = 1;
@@ -98,9 +98,14 @@ static VP8StatusCode AllocateBuffer(WebPDecBuffer* const buffer) {
     uint64_t uv_size = 0, a_size = 0, total_size;
     // We need memory and it hasn't been allocated yet.
     // => initialize output buffer, now that dimensions are known.
-    const int stride = w * kModeBpp[mode];
-    const uint64_t size = (uint64_t)stride * h;
+    int stride;
+    uint64_t size;
 
+    if ((uint64_t)w * kModeBpp[mode] >= (1ull << 32)) {
+      return VP8_STATUS_INVALID_PARAM;
+    }
+    stride = w * kModeBpp[mode];
+    size = (uint64_t)stride * h;
     if (!WebPIsRGBMode(mode)) {
       uv_stride = (w + 1) / 2;
       uv_size = (uint64_t)uv_stride * ((h + 1) / 2);
@@ -169,11 +174,11 @@ VP8StatusCode WebPFlipBuffer(WebPDecBuffer* const buffer) {
   return VP8_STATUS_OK;
 }
 
-VP8StatusCode WebPAllocateDecBuffer(int w, int h,
+VP8StatusCode WebPAllocateDecBuffer(int width, int height,
                                     const WebPDecoderOptions* const options,
-                                    WebPDecBuffer* const out) {
+                                    WebPDecBuffer* const buffer) {
   VP8StatusCode status;
-  if (out == NULL || w <= 0 || h <= 0) {
+  if (buffer == NULL || width <= 0 || height <= 0) {
     return VP8_STATUS_INVALID_PARAM;
   }
   if (options != NULL) {    // First, apply options if there is any.
@@ -182,33 +187,39 @@ VP8StatusCode WebPAllocateDecBuffer(int w, int h,
       const int ch = options->crop_height;
       const int x = options->crop_left & ~1;
       const int y = options->crop_top & ~1;
-      if (x < 0 || y < 0 || cw <= 0 || ch <= 0 || x + cw > w || y + ch > h) {
+      if (x < 0 || y < 0 || cw <= 0 || ch <= 0 ||
+          x + cw > width || y + ch > height) {
         return VP8_STATUS_INVALID_PARAM;   // out of frame boundary.
       }
-      w = cw;
-      h = ch;
+      width = cw;
+      height = ch;
     }
+
     if (options->use_scaling) {
+#if !defined(WEBP_REDUCE_SIZE)
       int scaled_width = options->scaled_width;
       int scaled_height = options->scaled_height;
       if (!WebPRescalerGetScaledDimensions(
-              w, h, &scaled_width, &scaled_height)) {
+              width, height, &scaled_width, &scaled_height)) {
         return VP8_STATUS_INVALID_PARAM;
       }
-      w = scaled_width;
-      h = scaled_height;
+      width = scaled_width;
+      height = scaled_height;
+#else
+      return VP8_STATUS_INVALID_PARAM;   // rescaling not supported
+#endif
     }
   }
-  out->width = w;
-  out->height = h;
+  buffer->width = width;
+  buffer->height = height;
 
   // Then, allocate buffer for real.
-  status = AllocateBuffer(out);
+  status = AllocateBuffer(buffer);
   if (status != VP8_STATUS_OK) return status;
 
   // Use the stride trick if vertical flip is needed.
   if (options != NULL && options->flip) {
-    status = WebPFlipBuffer(out);
+    status = WebPFlipBuffer(buffer);
   }
   return status;
 }
diff --git a/media/libwebp/dec/common_dec.h b/media/libwebp/dec/common_dec.h
index 6961e22470..9995f1a51a 100644
--- a/media/libwebp/dec/common_dec.h
+++ b/media/libwebp/dec/common_dec.h
@@ -11,8 +11,8 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#ifndef WEBP_DEC_COMMON_H_
-#define WEBP_DEC_COMMON_H_
+#ifndef WEBP_DEC_COMMON_DEC_H_
+#define WEBP_DEC_COMMON_DEC_H_
 
 // intra prediction modes
 enum { B_DC_PRED = 0,   // 4x4 modes
@@ -51,4 +51,4 @@ enum { MB_FEATURE_TREE_PROBS = 3,
        NUM_PROBAS = 11
      };
 
-#endif    // WEBP_DEC_COMMON_H_
+#endif    // WEBP_DEC_COMMON_DEC_H_
diff --git a/media/libwebp/dec/frame_dec.c b/media/libwebp/dec/frame_dec.c
index f91e27f7c8..57e4d96692 100644
--- a/media/libwebp/dec/frame_dec.c
+++ b/media/libwebp/dec/frame_dec.c
@@ -12,13 +12,13 @@
 // Author: Skal (pascal.massimino@gmail.com)
 
 #include <stdlib.h>
-#include "./vp8i_dec.h"
+#include "../dec/vp8i_dec.h"
 #include "../utils/utils.h"
 
 //------------------------------------------------------------------------------
 // Main reconstruction function.
 
-static const int kScan[16] = {
+static const uint16_t kScan[16] = {
   0 +  0 * BPS,  4 +  0 * BPS, 8 +  0 * BPS, 12 +  0 * BPS,
   0 +  4 * BPS,  4 +  4 * BPS, 8 +  4 * BPS, 12 +  4 * BPS,
   0 +  8 * BPS,  4 +  8 * BPS, 8 +  8 * BPS, 12 +  8 * BPS,
@@ -320,7 +320,7 @@ static void PrecomputeFilterStrengths(VP8Decoder* const dec) {
 #define MIN_DITHER_AMP 4
 
 #define DITHER_AMP_TAB_SIZE 12
-static const int kQuantToDitherAmp[DITHER_AMP_TAB_SIZE] = {
+static const uint8_t kQuantToDitherAmp[DITHER_AMP_TAB_SIZE] = {
   // roughly, it's dqm->uv_mat_[1]
   8, 7, 6, 4, 4, 2, 2, 2, 1, 1, 1, 1
 };
@@ -400,7 +400,9 @@ static void DitherRow(VP8Decoder* const dec) {
 #define MACROBLOCK_VPOS(mb_y)  ((mb_y) * 16)    // vertical position of a MB
 
 // Finalize and transmit a complete row. Return false in case of user-abort.
-static int FinishRow(VP8Decoder* const dec, VP8Io* const io) {
+static int FinishRow(void* arg1, void* arg2) {
+  VP8Decoder* const dec = (VP8Decoder*)arg1;
+  VP8Io* const io = (VP8Io*)arg2;
   int ok = 1;
   const VP8ThreadContext* const ctx = &dec->thread_ctx_;
   const int cache_id = ctx->id_;
@@ -448,10 +450,9 @@ static int FinishRow(VP8Decoder* const dec, VP8Io* const io) {
     if (y_end > io->crop_bottom) {
       y_end = io->crop_bottom;    // make sure we don't overflow on last row.
     }
+    // If dec->alpha_data_ is not NULL, we have some alpha plane present.
     io->a = NULL;
     if (dec->alpha_data_ != NULL && y_start < y_end) {
-      // TODO(skal): testing presence of alpha with dec->alpha_data_ is not a
-      // good idea.
       io->a = VP8DecompressAlphaRows(dec, io, y_start, y_end - y_start);
       if (io->a == NULL) {
         return VP8SetError(dec, VP8_STATUS_BITSTREAM_ERROR,
@@ -558,7 +559,6 @@ VP8StatusCode VP8EnterCritical(VP8Decoder* const dec, VP8Io* const io) {
   if (io->bypass_filtering) {
     dec->filter_type_ = 0;
   }
-  // TODO(skal): filter type / strength / sharpness forcing
 
   // Define the area where we can skip in-loop filtering, in case of cropping.
   //
@@ -569,8 +569,6 @@ VP8StatusCode VP8EnterCritical(VP8Decoder* const dec, VP8Io* const io) {
   // Means: there's a dependency chain that goes all the way up to the
   // top-left corner of the picture (MB #0). We must filter all the previous
   // macroblocks.
-  // TODO(skal): add an 'approximate_decoding' option, that won't produce
-  // a 1:1 bit-exactness for complex filtering?
   {
     const int extra_pixels = kFilterExtraRows[dec->filter_type_];
     if (dec->filter_type_ == 2) {
@@ -651,7 +649,7 @@ static int InitThreadContext(VP8Decoder* const dec) {
     }
     worker->data1 = dec;
     worker->data2 = (void*)&dec->thread_ctx_.io_;
-    worker->hook = (WebPWorkerHook)FinishRow;
+    worker->hook = FinishRow;
     dec->num_caches_ =
       (dec->filter_type_ > 0) ? MT_CACHE_LINES : MT_CACHE_LINES - 1;
   } else {
@@ -728,7 +726,7 @@ static int AllocateMemory(VP8Decoder* const dec) {
   }
 
   mem = (uint8_t*)dec->mem_;
-  dec->intra_t_ = (uint8_t*)mem;
+  dec->intra_t_ = mem;
   mem += intra_pred_mode_size;
 
   dec->yuv_t_ = (VP8TopSamples*)mem;
@@ -750,7 +748,7 @@ static int AllocateMemory(VP8Decoder* const dec) {
 
   mem = (uint8_t*)WEBP_ALIGN(mem);
   assert((yuv_size & WEBP_ALIGN_CST) == 0);
-  dec->yuv_b_ = (uint8_t*)mem;
+  dec->yuv_b_ = mem;
   mem += yuv_size;
 
   dec->mb_data_ = (VP8MBData*)mem;
@@ -766,7 +764,7 @@ static int AllocateMemory(VP8Decoder* const dec) {
     const int extra_rows = kFilterExtraRows[dec->filter_type_];
     const int extra_y = extra_rows * dec->cache_y_stride_;
     const int extra_uv = (extra_rows / 2) * dec->cache_uv_stride_;
-    dec->cache_y_ = ((uint8_t*)mem) + extra_y;
+    dec->cache_y_ = mem + extra_y;
     dec->cache_u_ = dec->cache_y_
                   + 16 * num_caches * dec->cache_y_stride_ + extra_uv;
     dec->cache_v_ = dec->cache_u_
@@ -776,7 +774,7 @@ static int AllocateMemory(VP8Decoder* const dec) {
   mem += cache_size;
 
   // alpha plane
-  dec->alpha_plane_ = alpha_size ? (uint8_t*)mem : NULL;
+  dec->alpha_plane_ = alpha_size ? mem : NULL;
   mem += alpha_size;
   assert(mem <= (uint8_t*)dec->mem_ + dec->mem_size_);
 
diff --git a/media/libwebp/dec/idec_dec.c b/media/libwebp/dec/idec_dec.c
index 78fb2e7186..6777323c75 100644
--- a/media/libwebp/dec/idec_dec.c
+++ b/media/libwebp/dec/idec_dec.c
@@ -15,9 +15,9 @@
 #include <string.h>
 #include <stdlib.h>
 
-#include "./alphai_dec.h"
-#include "./webpi_dec.h"
-#include "./vp8i_dec.h"
+#include "../dec/alphai_dec.h"
+#include "../dec/webpi_dec.h"
+#include "../dec/vp8i_dec.h"
 #include "../utils/utils.h"
 
 // In append mode, buffer allocations increase as multiples of this value.
@@ -673,12 +673,12 @@ void WebPIDelete(WebPIDecoder* idec) {
 //------------------------------------------------------------------------------
 // Wrapper toward WebPINewDecoder
 
-WebPIDecoder* WebPINewRGB(WEBP_CSP_MODE mode, uint8_t* output_buffer,
+WebPIDecoder* WebPINewRGB(WEBP_CSP_MODE csp, uint8_t* output_buffer,
                           size_t output_buffer_size, int output_stride) {
   const int is_external_memory = (output_buffer != NULL) ? 1 : 0;
   WebPIDecoder* idec;
 
-  if (mode >= MODE_YUV) return NULL;
+  if (csp >= MODE_YUV) return NULL;
   if (is_external_memory == 0) {    // Overwrite parameters to sane values.
     output_buffer_size = 0;
     output_stride = 0;
@@ -689,7 +689,7 @@ WebPIDecoder* WebPINewRGB(WEBP_CSP_MODE mode, uint8_t* output_buffer,
   }
   idec = WebPINewDecoder(NULL);
   if (idec == NULL) return NULL;
-  idec->output_.colorspace = mode;
+  idec->output_.colorspace = csp;
   idec->output_.is_external_memory = is_external_memory;
   idec->output_.u.RGBA.rgba = output_buffer;
   idec->output_.u.RGBA.stride = output_stride;
diff --git a/media/libwebp/dec/io_dec.c b/media/libwebp/dec/io_dec.c
index 8bfab86959..0edd9f526e 100644
--- a/media/libwebp/dec/io_dec.c
+++ b/media/libwebp/dec/io_dec.c
@@ -14,7 +14,7 @@
 #include <assert.h>
 #include <stdlib.h>
 #include "../dec/vp8i_dec.h"
-#include "./webpi_dec.h"
+#include "../dec/webpi_dec.h"
 #include "../dsp/dsp.h"
 #include "../dsp/yuv.h"
 #include "../utils/utils.h"
@@ -212,7 +212,7 @@ static int EmitAlphaRGBA4444(const VP8Io* const io, WebPDecParams* const p,
     int num_rows;
     const int start_y = GetAlphaSourceRow(io, &alpha, &num_rows);
     uint8_t* const base_rgba = buf->rgba + start_y * buf->stride;
-#ifdef WEBP_SWAP_16BIT_CSP
+#if (WEBP_SWAP_16BIT_CSP == 1)
     uint8_t* alpha_dst = base_rgba;
 #else
     uint8_t* alpha_dst = base_rgba + 1;
@@ -241,6 +241,7 @@ static int EmitAlphaRGBA4444(const VP8Io* const io, WebPDecParams* const p,
 //------------------------------------------------------------------------------
 // YUV rescaling (no final RGB conversion needed)
 
+#if !defined(WEBP_REDUCE_SIZE)
 static int Rescale(const uint8_t* src, int src_stride,
                    int new_lines, WebPRescaler* const wrk) {
   int num_lines_out = 0;
@@ -431,7 +432,7 @@ static int ExportAlphaRGBA4444(WebPDecParams* const p, int y_pos,
                                int max_lines_out) {
   const WebPRGBABuffer* const buf = &p->output->u.RGBA;
   uint8_t* const base_rgba = buf->rgba + y_pos * buf->stride;
-#ifdef WEBP_SWAP_16BIT_CSP
+#if (WEBP_SWAP_16BIT_CSP == 1)
   uint8_t* alpha_dst = base_rgba;
 #else
   uint8_t* alpha_dst = base_rgba + 1;
@@ -541,6 +542,8 @@ static int InitRGBRescaler(const VP8Io* const io, WebPDecParams* const p) {
   return 1;
 }
 
+#endif  // WEBP_REDUCE_SIZE
+
 //------------------------------------------------------------------------------
 // Default custom functions
 
@@ -561,10 +564,14 @@ static int CustomSetup(VP8Io* io) {
     WebPInitUpsamplers();
   }
   if (io->use_scaling) {
+#if !defined(WEBP_REDUCE_SIZE)
     const int ok = is_rgb ? InitRGBRescaler(io, p) : InitYUVRescaler(io, p);
     if (!ok) {
       return 0;    // memory error
     }
+#else
+    return 0;   // rescaling support not compiled
+#endif
   } else {
     if (is_rgb) {
       WebPInitSamplers();
@@ -598,9 +605,6 @@ static int CustomSetup(VP8Io* io) {
     }
   }
 
-  if (is_rgb) {
-    VP8YUVInit();
-  }
   return 1;
 }
 
diff --git a/media/libwebp/dec/quant_dec.c b/media/libwebp/dec/quant_dec.c
index 14e3198946..6ecaf1c453 100644
--- a/media/libwebp/dec/quant_dec.c
+++ b/media/libwebp/dec/quant_dec.c
@@ -11,7 +11,7 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#include "./vp8i_dec.h"
+#include "../dec/vp8i_dec.h"
 
 static WEBP_INLINE int clip(int v, int M) {
   return v < 0 ? 0 : v > M ? M : v;
diff --git a/media/libwebp/dec/tree_dec.c b/media/libwebp/dec/tree_dec.c
index 9e805f60f3..5818860254 100644
--- a/media/libwebp/dec/tree_dec.c
+++ b/media/libwebp/dec/tree_dec.c
@@ -11,15 +11,19 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#include "./vp8i_dec.h"
+#include "../dec/vp8i_dec.h"
 #include "../utils/bit_reader_inl_utils.h"
 
+#if !defined(USE_GENERIC_TREE)
 #if !defined(__arm__) && !defined(_M_ARM) && !defined(__aarch64__)
 // using a table is ~1-2% slower on ARM. Prefer the coded-tree approach then.
-#define USE_GENERIC_TREE
+#define USE_GENERIC_TREE 1   // ALTERNATE_CODE
+#else
+#define USE_GENERIC_TREE 0
 #endif
+#endif  // USE_GENERIC_TREE
 
-#ifdef USE_GENERIC_TREE
+#if (USE_GENERIC_TREE == 1)
 static const int8_t kYModesIntra4[18] = {
   -B_DC_PRED, 1,
     -B_TM_PRED, 2,
@@ -317,7 +321,7 @@ static void ParseIntraMode(VP8BitReader* const br,
       int x;
       for (x = 0; x < 4; ++x) {
         const uint8_t* const prob = kBModesProba[top[x]][ymode];
-#ifdef USE_GENERIC_TREE
+#if (USE_GENERIC_TREE == 1)
         // Generic tree-parsing
         int i = kYModesIntra4[VP8GetBit(br, prob[0])];
         while (i > 0) {
@@ -335,7 +339,7 @@ static void ParseIntraMode(VP8BitReader* const br,
                         (!VP8GetBit(br, prob[6]) ? B_LD_PRED :
                           (!VP8GetBit(br, prob[7]) ? B_VL_PRED :
                             (!VP8GetBit(br, prob[8]) ? B_HD_PRED : B_HU_PRED)));
-#endif    // USE_GENERIC_TREE
+#endif  // USE_GENERIC_TREE
         top[x] = ymode;
       }
       memcpy(modes, top, 4 * sizeof(*top));
@@ -498,7 +502,7 @@ static const uint8_t
 
 // Paragraph 9.9
 
-static const int kBands[16 + 1] = {
+static const uint8_t kBands[16 + 1] = {
   0, 1, 2, 3, 6, 4, 5, 6, 6, 6, 6, 6, 6, 6, 6, 7,
   0  // extra entry as sentinel
 };
diff --git a/media/libwebp/dec/vp8_dec.c b/media/libwebp/dec/vp8_dec.c
index fad8d9cf35..e7958be6b0 100644
--- a/media/libwebp/dec/vp8_dec.c
+++ b/media/libwebp/dec/vp8_dec.c
@@ -13,10 +13,10 @@
 
 #include <stdlib.h>
 
-#include "./alphai_dec.h"
-#include "./vp8i_dec.h"
-#include "./vp8li_dec.h"
-#include "./webpi_dec.h"
+#include "../dec/alphai_dec.h"
+#include "../dec/vp8i_dec.h"
+#include "../dec/vp8li_dec.h"
+#include "../dec/webpi_dec.h"
 #include "../utils/bit_reader_inl_utils.h"
 #include "../utils/utils.h"
 
@@ -491,7 +491,7 @@ static int GetCoeffsAlt(VP8BitReader* const br,
   return 16;
 }
 
-WEBP_TSAN_IGNORE_FUNCTION static void InitGetCoeffs(void) {
+static WEBP_TSAN_IGNORE_FUNCTION void InitGetCoeffs(void) {
   if (GetCoeffs == NULL) {
     if (VP8GetCPUInfo != NULL && VP8GetCPUInfo(kSlowSSSE3)) {
       GetCoeffs = GetCoeffsAlt;
diff --git a/media/libwebp/dec/vp8_dec.h b/media/libwebp/dec/vp8_dec.h
index b9337bbec0..7b4941d65e 100644
--- a/media/libwebp/dec/vp8_dec.h
+++ b/media/libwebp/dec/vp8_dec.h
@@ -11,8 +11,8 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#ifndef WEBP_WEBP_DECODE_VP8_H_
-#define WEBP_WEBP_DECODE_VP8_H_
+#ifndef WEBP_DEC_VP8_DEC_H_
+#define WEBP_DEC_VP8_DEC_H_
 
 #include "../webp/decode.h"
 
@@ -33,7 +33,7 @@ extern "C" {
 //   /* customize io's functions (setup()/put()/teardown()) if needed. */
 //
 //   VP8Decoder* dec = VP8New();
-//   bool ok = VP8Decode(dec);
+//   int ok = VP8Decode(dec, &io);
 //   if (!ok) printf("Error: %s\n", VP8StatusMessage(dec));
 //   VP8Delete(dec);
 //   return ok;
@@ -157,24 +157,24 @@ void VP8Delete(VP8Decoder* const dec);
 // Miscellaneous VP8/VP8L bitstream probing functions.
 
 // Returns true if the next 3 bytes in data contain the VP8 signature.
-WEBP_EXTERN(int) VP8CheckSignature(const uint8_t* const data, size_t data_size);
+WEBP_EXTERN int VP8CheckSignature(const uint8_t* const data, size_t data_size);
 
 // Validates the VP8 data-header and retrieves basic header information viz
 // width and height. Returns 0 in case of formatting error. *width/*height
 // can be passed NULL.
-WEBP_EXTERN(int) VP8GetInfo(
+WEBP_EXTERN int VP8GetInfo(
     const uint8_t* data,
     size_t data_size,    // data available so far
     size_t chunk_size,   // total data size expected in the chunk
     int* const width, int* const height);
 
 // Returns true if the next byte(s) in data is a VP8L signature.
-WEBP_EXTERN(int) VP8LCheckSignature(const uint8_t* const data, size_t size);
+WEBP_EXTERN int VP8LCheckSignature(const uint8_t* const data, size_t size);
 
 // Validates the VP8L data-header and retrieves basic header information viz
 // width, height and alpha. Returns 0 in case of formatting error.
 // width/height/has_alpha can be passed NULL.
-WEBP_EXTERN(int) VP8LGetInfo(
+WEBP_EXTERN int VP8LGetInfo(
     const uint8_t* data, size_t data_size,  // data available so far
     int* const width, int* const height, int* const has_alpha);
 
@@ -182,4 +182,4 @@ WEBP_EXTERN(int) VP8LGetInfo(
 }    // extern "C"
 #endif
 
-#endif  /* WEBP_WEBP_DECODE_VP8_H_ */
+#endif  /* WEBP_DEC_VP8_DEC_H_ */
diff --git a/media/libwebp/dec/vp8i_dec.h b/media/libwebp/dec/vp8i_dec.h
index 555853e8f8..d0ef67b91c 100644
--- a/media/libwebp/dec/vp8i_dec.h
+++ b/media/libwebp/dec/vp8i_dec.h
@@ -11,12 +11,12 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#ifndef WEBP_DEC_VP8I_H_
-#define WEBP_DEC_VP8I_H_
+#ifndef WEBP_DEC_VP8I_DEC_H_
+#define WEBP_DEC_VP8I_DEC_H_
 
 #include <string.h>     // for memcpy()
-#include "./common_dec.h"
-#include "./vp8li_dec.h"
+#include "../dec/common_dec.h"
+#include "../dec/vp8li_dec.h"
 #include "../utils/bit_reader_utils.h"
 #include "../utils/random_utils.h"
 #include "../utils/thread_utils.h"
@@ -30,8 +30,8 @@ extern "C" {
 // Various defines and enums
 
 // version numbers
-#define DEC_MAJ_VERSION 0
-#define DEC_MIN_VERSION 6
+#define DEC_MAJ_VERSION 1
+#define DEC_MIN_VERSION 0
 #define DEC_REV_VERSION 0
 
 // YUV-cache parameters. Cache is 32-bytes wide (= one cacheline).
@@ -57,7 +57,6 @@ extern "C" {
 //  '|' = left sample,   '-' = top sample,    '+' = top-left sample
 //  't' = extra top-right sample for 4x4 modes
 #define YUV_SIZE (BPS * 17 + BPS * 9)
-#define Y_SIZE   (BPS * 17)
 #define Y_OFF    (BPS * 1 + 8)
 #define U_OFF    (Y_OFF + BPS * 16 + BPS)
 #define V_OFF    (U_OFF + 16)
@@ -317,4 +316,4 @@ const uint8_t* VP8DecompressAlphaRows(VP8Decoder* const dec,
 }    // extern "C"
 #endif
 
-#endif  /* WEBP_DEC_VP8I_H_ */
+#endif  /* WEBP_DEC_VP8I_DEC_H_ */
diff --git a/media/libwebp/dec/vp8l_dec.c b/media/libwebp/dec/vp8l_dec.c
index ef359a91f0..6af696ddcc 100644
--- a/media/libwebp/dec/vp8l_dec.c
+++ b/media/libwebp/dec/vp8l_dec.c
@@ -14,8 +14,8 @@
 
 #include <stdlib.h>
 
-#include "./alphai_dec.h"
-#include "./vp8li_dec.h"
+#include "../dec/alphai_dec.h"
+#include "../dec/vp8li_dec.h"
 #include "../dsp/dsp.h"
 #include "../dsp/lossless.h"
 #include "../dsp/lossless_common.h"
@@ -28,8 +28,8 @@
 
 static const int kCodeLengthLiterals = 16;
 static const int kCodeLengthRepeatCode = 16;
-static const int kCodeLengthExtraBits[3] = { 2, 3, 7 };
-static const int kCodeLengthRepeatOffsets[3] = { 3, 3, 11 };
+static const uint8_t kCodeLengthExtraBits[3] = { 2, 3, 7 };
+static const uint8_t kCodeLengthRepeatOffsets[3] = { 3, 3, 11 };
 
 // -----------------------------------------------------------------------------
 //  Five Huffman codes are used at each meta code:
@@ -86,7 +86,7 @@ static const uint8_t kCodeToPlane[CODE_TO_PLANE_CODES] = {
 // All values computed for 8-bit first level lookup with Mark Adler's tool:
 // http://www.hdfgroup.org/ftp/lib-external/zlib/zlib-1.2.5/examples/enough.c
 #define FIXED_TABLE_SIZE (630 * 3 + 410)
-static const int kTableSize[12] = {
+static const uint16_t kTableSize[12] = {
   FIXED_TABLE_SIZE + 654,
   FIXED_TABLE_SIZE + 656,
   FIXED_TABLE_SIZE + 658,
@@ -485,6 +485,7 @@ static int ReadHuffmanCodes(VP8LDecoder* const dec, int xsize, int ysize,
 //------------------------------------------------------------------------------
 // Scaling.
 
+#if !defined(WEBP_REDUCE_SIZE)
 static int AllocateAndInitRescaler(VP8LDecoder* const dec, VP8Io* const io) {
   const int num_channels = 4;
   const int in_width = io->mb_w;
@@ -516,10 +517,13 @@ static int AllocateAndInitRescaler(VP8LDecoder* const dec, VP8Io* const io) {
                    out_width, out_height, 0, num_channels, work);
   return 1;
 }
+#endif   // WEBP_REDUCE_SIZE
 
 //------------------------------------------------------------------------------
 // Export to ARGB
 
+#if !defined(WEBP_REDUCE_SIZE)
+
 // We have special "export" function since we need to convert from BGRA
 static int Export(WebPRescaler* const rescaler, WEBP_CSP_MODE colorspace,
                   int rgba_stride, uint8_t* const rgba) {
@@ -561,6 +565,8 @@ static int EmitRescaledRowsRGBA(const VP8LDecoder* const dec,
   return num_lines_out;
 }
 
+#endif   // WEBP_REDUCE_SIZE
+
 // Emit rows without any scaling.
 static int EmitRows(WEBP_CSP_MODE colorspace,
                     const uint8_t* row_in, int in_stride,
@@ -746,9 +752,12 @@ static void ProcessRows(VP8LDecoder* const dec, int row) {
       if (WebPIsRGBMode(output->colorspace)) {  // convert to RGBA
         const WebPRGBABuffer* const buf = &output->u.RGBA;
         uint8_t* const rgba = buf->rgba + dec->last_out_row_ * buf->stride;
-        const int num_rows_out = io->use_scaling ?
+        const int num_rows_out =
+#if !defined(WEBP_REDUCE_SIZE)
+         io->use_scaling ?
             EmitRescaledRowsRGBA(dec, rows_data, in_stride, io->mb_h,
                                  rgba, buf->stride) :
+#endif  // WEBP_REDUCE_SIZE
             EmitRows(output->colorspace, rows_data, in_stride,
                      io->mb_w, io->mb_h, rgba, buf->stride);
         // Update 'last_out_row_'.
@@ -1012,12 +1021,13 @@ static int DecodeAlphaData(VP8LDecoder* const dec, uint8_t* const data,
       ok = 0;
       goto End;
     }
-    assert(br->eos_ == VP8LIsEndOfStream(br));
+    br->eos_ = VP8LIsEndOfStream(br);
   }
   // Process the remaining rows corresponding to last row-block.
   ExtractPalettedAlphaRows(dec, row > last_row ? last_row : row);
 
  End:
+  br->eos_ = VP8LIsEndOfStream(br);
   if (!ok || (br->eos_ && pos < end)) {
     ok = 0;
     dec->status_ = br->eos_ ? VP8_STATUS_SUSPENDED
@@ -1090,11 +1100,12 @@ static int DecodeImageData(VP8LDecoder* const dec, uint32_t* const data,
     VP8LFillBitWindow(br);
     if (htree_group->use_packed_table) {
       code = ReadPackedSymbols(htree_group, br, src);
+      if (VP8LIsEndOfStream(br)) break;
       if (code == PACKED_NON_LITERAL_CODE) goto AdvanceByOne;
     } else {
       code = ReadSymbol(htree_group->htrees[GREEN], br);
     }
-    if (br->eos_) break;  // early out
+    if (VP8LIsEndOfStream(br)) break;
     if (code < NUM_LITERAL_CODES) {  // Literal
       if (htree_group->is_trivial_literal) {
         *src = htree_group->literal_arb | (code << 8);
@@ -1104,7 +1115,7 @@ static int DecodeImageData(VP8LDecoder* const dec, uint32_t* const data,
         VP8LFillBitWindow(br);
         blue = ReadSymbol(htree_group->htrees[BLUE], br);
         alpha = ReadSymbol(htree_group->htrees[ALPHA], br);
-        if (br->eos_) break;
+        if (VP8LIsEndOfStream(br)) break;
         *src = ((uint32_t)alpha << 24) | (red << 16) | (code << 8) | blue;
       }
     AdvanceByOne:
@@ -1132,7 +1143,7 @@ static int DecodeImageData(VP8LDecoder* const dec, uint32_t* const data,
       VP8LFillBitWindow(br);
       dist_code = GetCopyDistance(dist_symbol, br);
       dist = PlaneCodeToDistance(width, dist_code);
-      if (br->eos_) break;
+      if (VP8LIsEndOfStream(br)) break;
       if (src - data < (ptrdiff_t)dist || src_end - src < (ptrdiff_t)length) {
         goto Error;
       } else {
@@ -1169,9 +1180,9 @@ static int DecodeImageData(VP8LDecoder* const dec, uint32_t* const data,
     } else {  // Not reached
       goto Error;
     }
-    assert(br->eos_ == VP8LIsEndOfStream(br));
   }
 
+  br->eos_ = VP8LIsEndOfStream(br);
   if (dec->incremental_ && br->eos_ && src < src_end) {
     RestoreState(dec);
   } else if (!br->eos_) {
@@ -1630,12 +1641,19 @@ int VP8LDecodeImage(VP8LDecoder* const dec) {
 
     if (!AllocateInternalBuffers32b(dec, io->width)) goto Err;
 
+#if !defined(WEBP_REDUCE_SIZE)
     if (io->use_scaling && !AllocateAndInitRescaler(dec, io)) goto Err;
-
+#else
+    if (io->use_scaling) {
+      dec->status_ = VP8_STATUS_INVALID_PARAM;
+      goto Err;
+    }
+#endif
     if (io->use_scaling || WebPIsPremultipliedMode(dec->output_->colorspace)) {
       // need the alpha-multiply functions for premultiplied output or rescaling
       WebPInitAlphaProcessing();
     }
+
     if (!WebPIsRGBMode(dec->output_->colorspace)) {
       WebPInitConvertARGBToYUV();
       if (dec->output_->u.YUVA.a != NULL) WebPInitAlphaProcessing();
diff --git a/media/libwebp/dec/vp8li_dec.h b/media/libwebp/dec/vp8li_dec.h
index 097a9d0589..ed89a02a94 100644
--- a/media/libwebp/dec/vp8li_dec.h
+++ b/media/libwebp/dec/vp8li_dec.h
@@ -12,11 +12,11 @@
 // Author: Skal (pascal.massimino@gmail.com)
 //         Vikas Arora(vikaas.arora@gmail.com)
 
-#ifndef WEBP_DEC_VP8LI_H_
-#define WEBP_DEC_VP8LI_H_
+#ifndef WEBP_DEC_VP8LI_DEC_H_
+#define WEBP_DEC_VP8LI_DEC_H_
 
 #include <string.h>     // for memcpy()
-#include "./webpi_dec.h"
+#include "../dec/webpi_dec.h"
 #include "../utils/bit_reader_utils.h"
 #include "../utils/color_cache_utils.h"
 #include "../utils/huffman_utils.h"
@@ -132,4 +132,4 @@ void VP8LDelete(VP8LDecoder* const dec);
 }    // extern "C"
 #endif
 
-#endif  /* WEBP_DEC_VP8LI_H_ */
+#endif  /* WEBP_DEC_VP8LI_DEC_H_ */
diff --git a/media/libwebp/dec/webp_dec.c b/media/libwebp/dec/webp_dec.c
index a8e9c2c510..89c264d0a0 100644
--- a/media/libwebp/dec/webp_dec.c
+++ b/media/libwebp/dec/webp_dec.c
@@ -13,9 +13,9 @@
 
 #include <stdlib.h>
 
-#include "./vp8i_dec.h"
-#include "./vp8li_dec.h"
-#include "./webpi_dec.h"
+#include "../dec/vp8i_dec.h"
+#include "../dec/vp8li_dec.h"
+#include "../dec/webpi_dec.h"
 #include "../utils/utils.h"
 #include "../webp/mux_types.h"  // ALPHA_FLAG
 
@@ -421,7 +421,9 @@ VP8StatusCode WebPParseHeaders(WebPHeaderStructure* const headers) {
                                 NULL, NULL, NULL, &has_animation,
                                 NULL, headers);
   if (status == VP8_STATUS_OK || status == VP8_STATUS_NOT_ENOUGH_DATA) {
-    // TODO(jzern): full support of animation frames will require API additions.
+    // The WebPDemux API + libwebp can be used to decode individual
+    // uncomposited frames or the WebPAnimDecoder can be used to fully
+    // reconstruct them (see webp/demux.h).
     if (has_animation) {
       status = VP8_STATUS_UNSUPPORTED_FEATURE;
     }
diff --git a/media/libwebp/dec/webpi_dec.h b/media/libwebp/dec/webpi_dec.h
index 696abc1958..d0a045e703 100644
--- a/media/libwebp/dec/webpi_dec.h
+++ b/media/libwebp/dec/webpi_dec.h
@@ -11,15 +11,15 @@
 //
 // Author: somnath@google.com (Somnath Banerjee)
 
-#ifndef WEBP_DEC_WEBPI_H_
-#define WEBP_DEC_WEBPI_H_
+#ifndef WEBP_DEC_WEBPI_DEC_H_
+#define WEBP_DEC_WEBPI_DEC_H_
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 #include "../utils/rescaler_utils.h"
-#include "./vp8_dec.h"
+#include "../dec/vp8_dec.h"
 
 //------------------------------------------------------------------------------
 // WebPDecParams: Decoding output parameters. Transient internal object.
@@ -130,4 +130,4 @@ int WebPAvoidSlowMemory(const WebPDecBuffer* const output,
 }    // extern "C"
 #endif
 
-#endif  /* WEBP_DEC_WEBPI_H_ */
+#endif  /* WEBP_DEC_WEBPI_DEC_H_ */
diff --git a/media/libwebp/demux/demux.c b/media/libwebp/demux/demux.c
index 100eab8c01..aec2a0a2d1 100644
--- a/media/libwebp/demux/demux.c
+++ b/media/libwebp/demux/demux.c
@@ -23,9 +23,9 @@
 #include "../webp/demux.h"
 #include "../webp/format_constants.h"
 
-#define DMUX_MAJ_VERSION 0
-#define DMUX_MIN_VERSION 3
-#define DMUX_REV_VERSION 2
+#define DMUX_MAJ_VERSION 1
+#define DMUX_MIN_VERSION 0
+#define DMUX_REV_VERSION 0
 
 typedef struct {
   size_t start_;        // start location of the data
@@ -205,12 +205,14 @@ static void SetFrameInfo(size_t start_offset, size_t size,
   frame->complete_ = complete;
 }
 
-// Store image bearing chunks to 'frame'.
+// Store image bearing chunks to 'frame'. 'min_size' is an optional size
+// requirement, it may be zero.
 static ParseStatus StoreFrame(int frame_num, uint32_t min_size,
                               MemBuffer* const mem, Frame* const frame) {
   int alpha_chunks = 0;
   int image_chunks = 0;
-  int done = (MemDataSize(mem) < min_size);
+  int done = (MemDataSize(mem) < CHUNK_HEADER_SIZE ||
+              MemDataSize(mem) < min_size);
   ParseStatus status = PARSE_OK;
 
   if (done) return PARSE_NEED_MORE_DATA;
@@ -401,9 +403,9 @@ static ParseStatus ParseSingleImage(WebPDemuxer* const dmux) {
   frame = (Frame*)WebPSafeCalloc(1ULL, sizeof(*frame));
   if (frame == NULL) return PARSE_ERROR;
 
-  // For the single image case we allow parsing of a partial frame, but we need
-  // at least CHUNK_HEADER_SIZE for parsing.
-  status = StoreFrame(1, CHUNK_HEADER_SIZE, &dmux->mem_, frame);
+  // For the single image case we allow parsing of a partial frame, so no
+  // minimum size is imposed here.
+  status = StoreFrame(1, 0, &dmux->mem_, frame);
   if (status != PARSE_ERROR) {
     const int has_alpha = !!(dmux->feature_flags_ & ALPHA_FLAG);
     // Clear any alpha when the alpha flag is missing.
diff --git a/media/libwebp/dsp/alpha_processing.c b/media/libwebp/dsp/alpha_processing.c
index 4b60e092be..6ff1352ae2 100644
--- a/media/libwebp/dsp/alpha_processing.c
+++ b/media/libwebp/dsp/alpha_processing.c
@@ -12,10 +12,13 @@
 // Author: Skal (pascal.massimino@gmail.com)
 
 #include <assert.h>
-#include "./dsp.h"
+#include "../dsp/dsp.h"
 
 // Tables can be faster on some platform but incur some extra binary size (~2k).
-// #define USE_TABLES_FOR_ALPHA_MULT
+#if !defined(USE_TABLES_FOR_ALPHA_MULT)
+#define USE_TABLES_FOR_ALPHA_MULT 0   // ALTERNATE_CODE
+#endif
+
 
 // -----------------------------------------------------------------------------
 
@@ -29,7 +32,7 @@ static uint32_t Mult(uint8_t x, uint32_t mult) {
   return v;
 }
 
-#ifdef USE_TABLES_FOR_ALPHA_MULT
+#if (USE_TABLES_FOR_ALPHA_MULT == 1)
 
 static const uint32_t kMultTables[2][256] = {
   {    // (255u << MFIX) / alpha
@@ -132,9 +135,9 @@ static WEBP_INLINE uint32_t GetScale(uint32_t a, int inverse) {
   return inverse ? (255u << MFIX) / a : a * KINV_255;
 }
 
-#endif    // USE_TABLES_FOR_ALPHA_MULT
+#endif  // USE_TABLES_FOR_ALPHA_MULT
 
-void WebPMultARGBRowC(uint32_t* const ptr, int width, int inverse) {
+void WebPMultARGBRow_C(uint32_t* const ptr, int width, int inverse) {
   int x;
   for (x = 0; x < width; ++x) {
     const uint32_t argb = ptr[x];
@@ -154,8 +157,8 @@ void WebPMultARGBRowC(uint32_t* const ptr, int width, int inverse) {
   }
 }
 
-void WebPMultRowC(uint8_t* const ptr, const uint8_t* const alpha,
-                  int width, int inverse) {
+void WebPMultRow_C(uint8_t* const ptr, const uint8_t* const alpha,
+                   int width, int inverse) {
   int x;
   for (x = 0; x < width; ++x) {
     const uint32_t a = alpha[x];
@@ -217,8 +220,9 @@ void WebPMultRows(uint8_t* ptr, int stride,
 #define PREMULTIPLY(x, m) (((x) * (m) + (1U << 23)) >> 24)
 #endif
 
-static void ApplyAlphaMultiply(uint8_t* rgba, int alpha_first,
-                               int w, int h, int stride) {
+#if !WEBP_NEON_OMIT_C_CODE
+static void ApplyAlphaMultiply_C(uint8_t* rgba, int alpha_first,
+                                 int w, int h, int stride) {
   while (h-- > 0) {
     uint8_t* const rgb = rgba + (alpha_first ? 1 : 0);
     const uint8_t* const alpha = rgba + (alpha_first ? 0 : 3);
@@ -235,6 +239,7 @@ static void ApplyAlphaMultiply(uint8_t* rgba, int alpha_first,
     rgba += stride;
   }
 }
+#endif  // !WEBP_NEON_OMIT_C_CODE
 #undef MULTIPLIER
 #undef PREMULTIPLY
 
@@ -254,9 +259,9 @@ static WEBP_INLINE uint8_t multiply(uint8_t x, uint32_t m) {
   return (x * m) >> 16;
 }
 
-static WEBP_INLINE void ApplyAlphaMultiply4444(uint8_t* rgba4444,
-                                               int w, int h, int stride,
-                                               int rg_byte_pos /* 0 or 1 */) {
+static WEBP_INLINE void ApplyAlphaMultiply4444_C(uint8_t* rgba4444,
+                                                 int w, int h, int stride,
+                                                 int rg_byte_pos /* 0 or 1 */) {
   while (h-- > 0) {
     int i;
     for (i = 0; i < w; ++i) {
@@ -275,15 +280,16 @@ static WEBP_INLINE void ApplyAlphaMultiply4444(uint8_t* rgba4444,
 }
 #undef MULTIPLIER
 
-static void ApplyAlphaMultiply_16b(uint8_t* rgba4444,
-                                   int w, int h, int stride) {
-#ifdef WEBP_SWAP_16BIT_CSP
-  ApplyAlphaMultiply4444(rgba4444, w, h, stride, 1);
+static void ApplyAlphaMultiply_16b_C(uint8_t* rgba4444,
+                                     int w, int h, int stride) {
+#if (WEBP_SWAP_16BIT_CSP == 1)
+  ApplyAlphaMultiply4444_C(rgba4444, w, h, stride, 1);
 #else
-  ApplyAlphaMultiply4444(rgba4444, w, h, stride, 0);
+  ApplyAlphaMultiply4444_C(rgba4444, w, h, stride, 0);
 #endif
 }
 
+#if !WEBP_NEON_OMIT_C_CODE
 static int DispatchAlpha_C(const uint8_t* alpha, int alpha_stride,
                            int width, int height,
                            uint8_t* dst, int dst_stride) {
@@ -338,6 +344,46 @@ static void ExtractGreen_C(const uint32_t* argb, uint8_t* alpha, int size) {
   int i;
   for (i = 0; i < size; ++i) alpha[i] = argb[i] >> 8;
 }
+#endif  // !WEBP_NEON_OMIT_C_CODE
+
+//------------------------------------------------------------------------------
+
+static int HasAlpha8b_C(const uint8_t* src, int length) {
+  while (length-- > 0) if (*src++ != 0xff) return 1;
+  return 0;
+}
+
+static int HasAlpha32b_C(const uint8_t* src, int length) {
+  int x;
+  for (x = 0; length-- > 0; x += 4) if (src[x] != 0xff) return 1;
+  return 0;
+}
+
+//------------------------------------------------------------------------------
+// Simple channel manipulations.
+
+static WEBP_INLINE uint32_t MakeARGB32(int a, int r, int g, int b) {
+  return (((uint32_t)a << 24) | (r << 16) | (g << 8) | b);
+}
+
+#ifdef WORDS_BIGENDIAN
+static void PackARGB_C(const uint8_t* a, const uint8_t* r, const uint8_t* g,
+                       const uint8_t* b, int len, uint32_t* out) {
+  int i;
+  for (i = 0; i < len; ++i) {
+    out[i] = MakeARGB32(a[4 * i], r[4 * i], g[4 * i], b[4 * i]);
+  }
+}
+#endif
+
+static void PackRGB_C(const uint8_t* r, const uint8_t* g, const uint8_t* b,
+                      int len, int step, uint32_t* out) {
+  int i, offset = 0;
+  for (i = 0; i < len; ++i) {
+    out[i] = MakeARGB32(0xff, r[offset], g[offset], b[offset]);
+    offset += step;
+  }
+}
 
 void (*WebPApplyAlphaMultiply)(uint8_t*, int, int, int, int);
 void (*WebPApplyAlphaMultiply4444)(uint8_t*, int, int, int);
@@ -345,6 +391,15 @@ int (*WebPDispatchAlpha)(const uint8_t*, int, int, int, uint8_t*, int);
 void (*WebPDispatchAlphaToGreen)(const uint8_t*, int, int, int, uint32_t*, int);
 int (*WebPExtractAlpha)(const uint8_t*, int, int, int, uint8_t*, int);
 void (*WebPExtractGreen)(const uint32_t* argb, uint8_t* alpha, int size);
+#ifdef WORDS_BIGENDIAN
+void (*WebPPackARGB)(const uint8_t* a, const uint8_t* r, const uint8_t* g,
+                     const uint8_t* b, int, uint32_t*);
+#endif
+void (*WebPPackRGB)(const uint8_t* r, const uint8_t* g, const uint8_t* b,
+                    int len, int step, uint32_t* out);
+
+int (*WebPHasAlpha8b)(const uint8_t* src, int length);
+int (*WebPHasAlpha32b)(const uint8_t* src, int length);
 
 //------------------------------------------------------------------------------
 // Init function
@@ -354,21 +409,25 @@ extern void WebPInitAlphaProcessingSSE2(void);
 extern void WebPInitAlphaProcessingSSE41(void);
 extern void WebPInitAlphaProcessingNEON(void);
 
-static volatile VP8CPUInfo alpha_processing_last_cpuinfo_used =
-    (VP8CPUInfo)&alpha_processing_last_cpuinfo_used;
-
-WEBP_TSAN_IGNORE_FUNCTION void WebPInitAlphaProcessing(void) {
-  if (alpha_processing_last_cpuinfo_used == VP8GetCPUInfo) return;
-
-  WebPMultARGBRow = WebPMultARGBRowC;
-  WebPMultRow = WebPMultRowC;
-  WebPApplyAlphaMultiply = ApplyAlphaMultiply;
-  WebPApplyAlphaMultiply4444 = ApplyAlphaMultiply_16b;
+WEBP_DSP_INIT_FUNC(WebPInitAlphaProcessing) {
+  WebPMultARGBRow = WebPMultARGBRow_C;
+  WebPMultRow = WebPMultRow_C;
+  WebPApplyAlphaMultiply4444 = ApplyAlphaMultiply_16b_C;
 
+#ifdef WORDS_BIGENDIAN
+  WebPPackARGB = PackARGB_C;
+#endif
+  WebPPackRGB = PackRGB_C;
+#if !WEBP_NEON_OMIT_C_CODE
+  WebPApplyAlphaMultiply = ApplyAlphaMultiply_C;
   WebPDispatchAlpha = DispatchAlpha_C;
   WebPDispatchAlphaToGreen = DispatchAlphaToGreen_C;
   WebPExtractAlpha = ExtractAlpha_C;
   WebPExtractGreen = ExtractGreen_C;
+#endif
+
+  WebPHasAlpha8b = HasAlpha8b_C;
+  WebPHasAlpha32b = HasAlpha32b_C;
 
   // If defined, use CPUInfo() to overwrite some pointers with faster versions.
   if (VP8GetCPUInfo != NULL) {
@@ -382,16 +441,32 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitAlphaProcessing(void) {
 #endif
     }
 #endif
-#if defined(WEBP_USE_NEON)
-    if (VP8GetCPUInfo(kNEON)) {
-      WebPInitAlphaProcessingNEON();
-    }
-#endif
 #if defined(WEBP_USE_MIPS_DSP_R2)
     if (VP8GetCPUInfo(kMIPSdspR2)) {
       WebPInitAlphaProcessingMIPSdspR2();
     }
 #endif
   }
-  alpha_processing_last_cpuinfo_used = VP8GetCPUInfo;
+
+#if defined(WEBP_USE_NEON)
+  if (WEBP_NEON_OMIT_C_CODE ||
+      (VP8GetCPUInfo != NULL && VP8GetCPUInfo(kNEON))) {
+    WebPInitAlphaProcessingNEON();
+  }
+#endif
+
+  assert(WebPMultARGBRow != NULL);
+  assert(WebPMultRow != NULL);
+  assert(WebPApplyAlphaMultiply != NULL);
+  assert(WebPApplyAlphaMultiply4444 != NULL);
+  assert(WebPDispatchAlpha != NULL);
+  assert(WebPDispatchAlphaToGreen != NULL);
+  assert(WebPExtractAlpha != NULL);
+  assert(WebPExtractGreen != NULL);
+#ifdef WORDS_BIGENDIAN
+  assert(WebPPackARGB != NULL);
+#endif
+  assert(WebPPackRGB != NULL);
+  assert(WebPHasAlpha8b != NULL);
+  assert(WebPHasAlpha32b != NULL);
 }
diff --git a/media/libwebp/dsp/alpha_processing_sse2.c b/media/libwebp/dsp/alpha_processing_sse2.c
index 83dc559fac..9a3bc4485a 100644
--- a/media/libwebp/dsp/alpha_processing_sse2.c
+++ b/media/libwebp/dsp/alpha_processing_sse2.c
@@ -11,16 +11,16 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#include "./dsp.h"
+#include "../dsp/dsp.h"
 
 #if defined(WEBP_USE_SSE2)
 #include <emmintrin.h>
 
 //------------------------------------------------------------------------------
 
-static int DispatchAlpha(const uint8_t* alpha, int alpha_stride,
-                         int width, int height,
-                         uint8_t* dst, int dst_stride) {
+static int DispatchAlpha_SSE2(const uint8_t* alpha, int alpha_stride,
+                              int width, int height,
+                              uint8_t* dst, int dst_stride) {
   // alpha_and stores an 'and' operation of all the alpha[] values. The final
   // value is not 0xff if any of the alpha[] is not equal to 0xff.
   uint32_t alpha_and = 0xff;
@@ -72,9 +72,9 @@ static int DispatchAlpha(const uint8_t* alpha, int alpha_stride,
   return (alpha_and != 0xff);
 }
 
-static void DispatchAlphaToGreen(const uint8_t* alpha, int alpha_stride,
-                                 int width, int height,
-                                 uint32_t* dst, int dst_stride) {
+static void DispatchAlphaToGreen_SSE2(const uint8_t* alpha, int alpha_stride,
+                                      int width, int height,
+                                      uint32_t* dst, int dst_stride) {
   int i, j;
   const __m128i zero = _mm_setzero_si128();
   const int limit = width & ~15;
@@ -98,9 +98,9 @@ static void DispatchAlphaToGreen(const uint8_t* alpha, int alpha_stride,
   }
 }
 
-static int ExtractAlpha(const uint8_t* argb, int argb_stride,
-                        int width, int height,
-                        uint8_t* alpha, int alpha_stride) {
+static int ExtractAlpha_SSE2(const uint8_t* argb, int argb_stride,
+                             int width, int height,
+                             uint8_t* alpha, int alpha_stride) {
   // alpha_and stores an 'and' operation of all the alpha[] values. The final
   // value is not 0xff if any of the alpha[] is not equal to 0xff.
   uint32_t alpha_and = 0xff;
@@ -210,6 +210,61 @@ static void ApplyAlphaMultiply_SSE2(uint8_t* rgba, int alpha_first,
 #undef MULTIPLIER
 #undef PREMULTIPLY
 
+//------------------------------------------------------------------------------
+// Alpha detection
+
+static int HasAlpha8b_SSE2(const uint8_t* src, int length) {
+  const __m128i all_0xff = _mm_set1_epi8(0xff);
+  int i = 0;
+  for (; i + 16 <= length; i += 16) {
+    const __m128i v = _mm_loadu_si128((const __m128i*)(src + i));
+    const __m128i bits = _mm_cmpeq_epi8(v, all_0xff);
+    const int mask = _mm_movemask_epi8(bits);
+    if (mask != 0xffff) return 1;
+  }
+  for (; i < length; ++i) if (src[i] != 0xff) return 1;
+  return 0;
+}
+
+static int HasAlpha32b_SSE2(const uint8_t* src, int length) {
+  const __m128i alpha_mask = _mm_set1_epi32(0xff);
+  const __m128i all_0xff = _mm_set1_epi8(0xff);
+  int i = 0;
+  // We don't know if we can access the last 3 bytes after the last alpha
+  // value 'src[4 * length - 4]' (because we don't know if alpha is the first
+  // or the last byte of the quadruplet). Hence the '-3' protection below.
+  length = length * 4 - 3;   // size in bytes
+  for (; i + 64 <= length; i += 64) {
+    const __m128i a0 = _mm_loadu_si128((const __m128i*)(src + i +  0));
+    const __m128i a1 = _mm_loadu_si128((const __m128i*)(src + i + 16));
+    const __m128i a2 = _mm_loadu_si128((const __m128i*)(src + i + 32));
+    const __m128i a3 = _mm_loadu_si128((const __m128i*)(src + i + 48));
+    const __m128i b0 = _mm_and_si128(a0, alpha_mask);
+    const __m128i b1 = _mm_and_si128(a1, alpha_mask);
+    const __m128i b2 = _mm_and_si128(a2, alpha_mask);
+    const __m128i b3 = _mm_and_si128(a3, alpha_mask);
+    const __m128i c0 = _mm_packs_epi32(b0, b1);
+    const __m128i c1 = _mm_packs_epi32(b2, b3);
+    const __m128i d  = _mm_packus_epi16(c0, c1);
+    const __m128i bits = _mm_cmpeq_epi8(d, all_0xff);
+    const int mask = _mm_movemask_epi8(bits);
+    if (mask != 0xffff) return 1;
+  }
+  for (; i + 32 <= length; i += 32) {
+    const __m128i a0 = _mm_loadu_si128((const __m128i*)(src + i +  0));
+    const __m128i a1 = _mm_loadu_si128((const __m128i*)(src + i + 16));
+    const __m128i b0 = _mm_and_si128(a0, alpha_mask);
+    const __m128i b1 = _mm_and_si128(a1, alpha_mask);
+    const __m128i c  = _mm_packs_epi32(b0, b1);
+    const __m128i d  = _mm_packus_epi16(c, c);
+    const __m128i bits = _mm_cmpeq_epi8(d, all_0xff);
+    const int mask = _mm_movemask_epi8(bits);
+    if (mask != 0xffff) return 1;
+  }
+  for (; i <= length; i += 4) if (src[i] != 0xff) return 1;
+  return 0;
+}
+
 // -----------------------------------------------------------------------------
 // Apply alpha value to rows
 
@@ -238,7 +293,7 @@ static void MultARGBRow_SSE2(uint32_t* const ptr, int width, int inverse) {
     }
   }
   width -= x;
-  if (width > 0) WebPMultARGBRowC(ptr + x, width, inverse);
+  if (width > 0) WebPMultARGBRow_C(ptr + x, width, inverse);
 }
 
 static void MultRow_SSE2(uint8_t* const ptr, const uint8_t* const alpha,
@@ -261,7 +316,7 @@ static void MultRow_SSE2(uint8_t* const ptr, const uint8_t* const alpha,
     }
   }
   width -= x;
-  if (width > 0) WebPMultRowC(ptr + x, alpha + x, width, inverse);
+  if (width > 0) WebPMultRow_C(ptr + x, alpha + x, width, inverse);
 }
 
 //------------------------------------------------------------------------------
@@ -273,9 +328,12 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitAlphaProcessingSSE2(void) {
   WebPMultARGBRow = MultARGBRow_SSE2;
   WebPMultRow = MultRow_SSE2;
   WebPApplyAlphaMultiply = ApplyAlphaMultiply_SSE2;
-  WebPDispatchAlpha = DispatchAlpha;
-  WebPDispatchAlphaToGreen = DispatchAlphaToGreen;
-  WebPExtractAlpha = ExtractAlpha;
+  WebPDispatchAlpha = DispatchAlpha_SSE2;
+  WebPDispatchAlphaToGreen = DispatchAlphaToGreen_SSE2;
+  WebPExtractAlpha = ExtractAlpha_SSE2;
+
+  WebPHasAlpha8b = HasAlpha8b_SSE2;
+  WebPHasAlpha32b = HasAlpha32b_SSE2;
 }
 
 #else  // !WEBP_USE_SSE2
diff --git a/media/libwebp/dsp/alpha_processing_sse41.c b/media/libwebp/dsp/alpha_processing_sse41.c
index 986fde94ed..e33c1aba4d 100644
--- a/media/libwebp/dsp/alpha_processing_sse41.c
+++ b/media/libwebp/dsp/alpha_processing_sse41.c
@@ -11,7 +11,7 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#include "./dsp.h"
+#include "../dsp/dsp.h"
 
 #if defined(WEBP_USE_SSE41)
 
@@ -19,9 +19,9 @@
 
 //------------------------------------------------------------------------------
 
-static int ExtractAlpha(const uint8_t* argb, int argb_stride,
-                        int width, int height,
-                        uint8_t* alpha, int alpha_stride) {
+static int ExtractAlpha_SSE41(const uint8_t* argb, int argb_stride,
+                              int width, int height,
+                              uint8_t* alpha, int alpha_stride) {
   // alpha_and stores an 'and' operation of all the alpha[] values. The final
   // value is not 0xff if any of the alpha[] is not equal to 0xff.
   uint32_t alpha_and = 0xff;
@@ -82,7 +82,7 @@ static int ExtractAlpha(const uint8_t* argb, int argb_stride,
 extern void WebPInitAlphaProcessingSSE41(void);
 
 WEBP_TSAN_IGNORE_FUNCTION void WebPInitAlphaProcessingSSE41(void) {
-  WebPExtractAlpha = ExtractAlpha;
+  WebPExtractAlpha = ExtractAlpha_SSE41;
 }
 
 #else  // !WEBP_USE_SSE41
diff --git a/media/libwebp/dsp/common_sse2.h b/media/libwebp/dsp/common_sse2.h
index 995d7cf4ea..e9f1ebff44 100644
--- a/media/libwebp/dsp/common_sse2.h
+++ b/media/libwebp/dsp/common_sse2.h
@@ -128,9 +128,9 @@ static WEBP_INLINE void VP8Transpose_2_4x4_16b(
 // Pack the planar buffers
 // rrrr... rrrr... gggg... gggg... bbbb... bbbb....
 // triplet by triplet in the output buffer rgb as rgbrgbrgbrgb ...
-static WEBP_INLINE void VP8PlanarTo24b(__m128i* const in0, __m128i* const in1,
-                                       __m128i* const in2, __m128i* const in3,
-                                       __m128i* const in4, __m128i* const in5) {
+static WEBP_INLINE void VP8PlanarTo24b_SSE2(
+    __m128i* const in0, __m128i* const in1, __m128i* const in2,
+    __m128i* const in3, __m128i* const in4, __m128i* const in5) {
   // The input is 6 registers of sixteen 8b but for the sake of explanation,
   // let's take 6 registers of four 8b values.
   // To pack, we will keep taking one every two 8b integer and move it
@@ -159,10 +159,10 @@ static WEBP_INLINE void VP8PlanarTo24b(__m128i* const in0, __m128i* const in1,
 
 // Convert four packed four-channel buffers like argbargbargbargb... into the
 // split channels aaaaa ... rrrr ... gggg .... bbbbb ......
-static WEBP_INLINE void VP8L32bToPlanar(__m128i* const in0,
-                                        __m128i* const in1,
-                                        __m128i* const in2,
-                                        __m128i* const in3) {
+static WEBP_INLINE void VP8L32bToPlanar_SSE2(__m128i* const in0,
+                                             __m128i* const in1,
+                                             __m128i* const in2,
+                                             __m128i* const in3) {
   // Column-wise transpose.
   const __m128i A0 = _mm_unpacklo_epi8(*in0, *in1);
   const __m128i A1 = _mm_unpackhi_epi8(*in0, *in1);
diff --git a/media/libwebp/dsp/common_sse41.h b/media/libwebp/dsp/common_sse41.h
new file mode 100644
index 0000000000..2f173c024a
--- /dev/null
+++ b/media/libwebp/dsp/common_sse41.h
@@ -0,0 +1,132 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+// SSE4 code common to several files.
+//
+// Author: Vincent Rabaud (vrabaud@google.com)
+
+#ifndef WEBP_DSP_COMMON_SSE41_H_
+#define WEBP_DSP_COMMON_SSE41_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if defined(WEBP_USE_SSE41)
+#include <smmintrin.h>
+
+//------------------------------------------------------------------------------
+// Channel mixing.
+// Shuffles the input buffer as A0 0 0 A1 0 0 A2 ...
+#define WEBP_SSE41_SHUFF(OUT, IN0, IN1)    \
+  OUT##0 = _mm_shuffle_epi8(*IN0, shuff0); \
+  OUT##1 = _mm_shuffle_epi8(*IN0, shuff1); \
+  OUT##2 = _mm_shuffle_epi8(*IN0, shuff2); \
+  OUT##3 = _mm_shuffle_epi8(*IN1, shuff0); \
+  OUT##4 = _mm_shuffle_epi8(*IN1, shuff1); \
+  OUT##5 = _mm_shuffle_epi8(*IN1, shuff2);
+
+// Pack the planar buffers
+// rrrr... rrrr... gggg... gggg... bbbb... bbbb....
+// triplet by triplet in the output buffer rgb as rgbrgbrgbrgb ...
+static WEBP_INLINE void VP8PlanarTo24b_SSE41(
+    __m128i* const in0, __m128i* const in1, __m128i* const in2,
+    __m128i* const in3, __m128i* const in4, __m128i* const in5) {
+  __m128i R0, R1, R2, R3, R4, R5;
+  __m128i G0, G1, G2, G3, G4, G5;
+  __m128i B0, B1, B2, B3, B4, B5;
+
+  // Process R.
+  {
+    const __m128i shuff0 = _mm_set_epi8(
+        5, -1, -1, 4, -1, -1, 3, -1, -1, 2, -1, -1, 1, -1, -1, 0);
+    const __m128i shuff1 = _mm_set_epi8(
+        -1, 10, -1, -1, 9, -1, -1, 8, -1, -1, 7, -1, -1, 6, -1, -1);
+    const __m128i shuff2 = _mm_set_epi8(
+     -1, -1, 15, -1, -1, 14, -1, -1, 13, -1, -1, 12, -1, -1, 11, -1);
+    WEBP_SSE41_SHUFF(R, in0, in1)
+  }
+
+  // Process G.
+  {
+    // Same as before, just shifted to the left by one and including the right
+    // padding.
+    const __m128i shuff0 = _mm_set_epi8(
+        -1, -1, 4, -1, -1, 3, -1, -1, 2, -1, -1, 1, -1, -1, 0, -1);
+    const __m128i shuff1 = _mm_set_epi8(
+        10, -1, -1, 9, -1, -1, 8, -1, -1, 7, -1, -1, 6, -1, -1, 5);
+    const __m128i shuff2 = _mm_set_epi8(
+     -1, 15, -1, -1, 14, -1, -1, 13, -1, -1, 12, -1, -1, 11, -1, -1);
+    WEBP_SSE41_SHUFF(G, in2, in3)
+  }
+
+  // Process B.
+  {
+    const __m128i shuff0 = _mm_set_epi8(
+        -1, 4, -1, -1, 3, -1, -1, 2, -1, -1, 1, -1, -1, 0, -1, -1);
+    const __m128i shuff1 = _mm_set_epi8(
+        -1, -1, 9, -1, -1, 8, -1, -1, 7, -1, -1, 6, -1, -1, 5, -1);
+    const __m128i shuff2 = _mm_set_epi8(
+      15, -1, -1, 14, -1, -1, 13, -1, -1, 12, -1, -1, 11, -1, -1, 10);
+    WEBP_SSE41_SHUFF(B, in4, in5)
+  }
+
+  // OR the different channels.
+  {
+    const __m128i RG0 = _mm_or_si128(R0, G0);
+    const __m128i RG1 = _mm_or_si128(R1, G1);
+    const __m128i RG2 = _mm_or_si128(R2, G2);
+    const __m128i RG3 = _mm_or_si128(R3, G3);
+    const __m128i RG4 = _mm_or_si128(R4, G4);
+    const __m128i RG5 = _mm_or_si128(R5, G5);
+    *in0 = _mm_or_si128(RG0, B0);
+    *in1 = _mm_or_si128(RG1, B1);
+    *in2 = _mm_or_si128(RG2, B2);
+    *in3 = _mm_or_si128(RG3, B3);
+    *in4 = _mm_or_si128(RG4, B4);
+    *in5 = _mm_or_si128(RG5, B5);
+  }
+}
+
+#undef WEBP_SSE41_SHUFF
+
+// Convert four packed four-channel buffers like argbargbargbargb... into the
+// split channels aaaaa ... rrrr ... gggg .... bbbbb ......
+static WEBP_INLINE void VP8L32bToPlanar_SSE41(__m128i* const in0,
+                                              __m128i* const in1,
+                                              __m128i* const in2,
+                                              __m128i* const in3) {
+  // aaaarrrrggggbbbb
+  const __m128i shuff0 =
+      _mm_set_epi8(15, 11, 7, 3, 14, 10, 6, 2, 13, 9, 5, 1, 12, 8, 4, 0);
+  const __m128i A0 = _mm_shuffle_epi8(*in0, shuff0);
+  const __m128i A1 = _mm_shuffle_epi8(*in1, shuff0);
+  const __m128i A2 = _mm_shuffle_epi8(*in2, shuff0);
+  const __m128i A3 = _mm_shuffle_epi8(*in3, shuff0);
+  // A0A1R0R1
+  // G0G1B0B1
+  // A2A3R2R3
+  // G0G1B0B1
+  const __m128i B0 = _mm_unpacklo_epi32(A0, A1);
+  const __m128i B1 = _mm_unpackhi_epi32(A0, A1);
+  const __m128i B2 = _mm_unpacklo_epi32(A2, A3);
+  const __m128i B3 = _mm_unpackhi_epi32(A2, A3);
+  *in3 = _mm_unpacklo_epi64(B0, B2);
+  *in2 = _mm_unpackhi_epi64(B0, B2);
+  *in1 = _mm_unpacklo_epi64(B1, B3);
+  *in0 = _mm_unpackhi_epi64(B1, B3);
+}
+
+#endif  // WEBP_USE_SSE41
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // WEBP_DSP_COMMON_SSE41_H_
diff --git a/media/libwebp/dsp/dec.c b/media/libwebp/dsp/dec.c
index 007e985d8b..a599d26bc0 100644
--- a/media/libwebp/dsp/dec.c
+++ b/media/libwebp/dsp/dec.c
@@ -11,7 +11,9 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#include "./dsp.h"
+#include <assert.h>
+
+#include "../dsp/dsp.h"
 #include "../dec/vp8i_dec.h"
 #include "../utils/utils.h"
 
@@ -25,7 +27,7 @@ static WEBP_INLINE uint8_t clip_8b(int v) {
 // Transforms (Paragraph 14.4)
 
 #define STORE(x, y, v) \
-  dst[x + y * BPS] = clip_8b(dst[x + y * BPS] + ((v) >> 3))
+  dst[(x) + (y) * BPS] = clip_8b(dst[(x) + (y) * BPS] + ((v) >> 3))
 
 #define STORE2(y, dc, d, c) do {    \
   const int DC = (dc);              \
@@ -38,7 +40,8 @@ static WEBP_INLINE uint8_t clip_8b(int v) {
 #define MUL1(a) ((((a) * 20091) >> 16) + (a))
 #define MUL2(a) (((a) * 35468) >> 16)
 
-static void TransformOne(const int16_t* in, uint8_t* dst) {
+#if !WEBP_NEON_OMIT_C_CODE
+static void TransformOne_C(const int16_t* in, uint8_t* dst) {
   int C[4 * 4], *tmp;
   int i;
   tmp = C;
@@ -78,7 +81,7 @@ static void TransformOne(const int16_t* in, uint8_t* dst) {
 }
 
 // Simplified transform when only in[0], in[1] and in[4] are non-zero
-static void TransformAC3(const int16_t* in, uint8_t* dst) {
+static void TransformAC3_C(const int16_t* in, uint8_t* dst) {
   const int a = in[0] + 4;
   const int c4 = MUL2(in[4]);
   const int d4 = MUL1(in[4]);
@@ -93,19 +96,21 @@ static void TransformAC3(const int16_t* in, uint8_t* dst) {
 #undef MUL2
 #undef STORE2
 
-static void TransformTwo(const int16_t* in, uint8_t* dst, int do_two) {
-  TransformOne(in, dst);
+static void TransformTwo_C(const int16_t* in, uint8_t* dst, int do_two) {
+  TransformOne_C(in, dst);
   if (do_two) {
-    TransformOne(in + 16, dst + 4);
+    TransformOne_C(in + 16, dst + 4);
   }
 }
+#endif  // !WEBP_NEON_OMIT_C_CODE
 
-static void TransformUV(const int16_t* in, uint8_t* dst) {
+static void TransformUV_C(const int16_t* in, uint8_t* dst) {
   VP8Transform(in + 0 * 16, dst, 1);
   VP8Transform(in + 2 * 16, dst + 4 * BPS, 1);
 }
 
-static void TransformDC(const int16_t* in, uint8_t* dst) {
+#if !WEBP_NEON_OMIT_C_CODE
+static void TransformDC_C(const int16_t* in, uint8_t* dst) {
   const int DC = in[0] + 4;
   int i, j;
   for (j = 0; j < 4; ++j) {
@@ -114,8 +119,9 @@ static void TransformDC(const int16_t* in, uint8_t* dst) {
     }
   }
 }
+#endif  // !WEBP_NEON_OMIT_C_CODE
 
-static void TransformDCUV(const int16_t* in, uint8_t* dst) {
+static void TransformDCUV_C(const int16_t* in, uint8_t* dst) {
   if (in[0 * 16]) VP8TransformDC(in + 0 * 16, dst);
   if (in[1 * 16]) VP8TransformDC(in + 1 * 16, dst + 4);
   if (in[2 * 16]) VP8TransformDC(in + 2 * 16, dst + 4 * BPS);
@@ -127,7 +133,8 @@ static void TransformDCUV(const int16_t* in, uint8_t* dst) {
 //------------------------------------------------------------------------------
 // Paragraph 14.3
 
-static void TransformWHT(const int16_t* in, int16_t* out) {
+#if !WEBP_NEON_OMIT_C_CODE
+static void TransformWHT_C(const int16_t* in, int16_t* out) {
   int tmp[16];
   int i;
   for (i = 0; i < 4; ++i) {
@@ -153,6 +160,7 @@ static void TransformWHT(const int16_t* in, int16_t* out) {
     out += 64;
   }
 }
+#endif  // !WEBP_NEON_OMIT_C_CODE
 
 void (*VP8TransformWHT)(const int16_t* in, int16_t* out);
 
@@ -161,6 +169,7 @@ void (*VP8TransformWHT)(const int16_t* in, int16_t* out);
 
 #define DST(x, y) dst[(x) + (y) * BPS]
 
+#if !WEBP_NEON_OMIT_C_CODE
 static WEBP_INLINE void TrueMotion(uint8_t* dst, int size) {
   const uint8_t* top = dst - BPS;
   const uint8_t* const clip0 = VP8kclip1 - top[-1];
@@ -174,21 +183,21 @@ static WEBP_INLINE void TrueMotion(uint8_t* dst, int size) {
     dst += BPS;
   }
 }
-static void TM4(uint8_t* dst)   { TrueMotion(dst, 4); }
-static void TM8uv(uint8_t* dst) { TrueMotion(dst, 8); }
-static void TM16(uint8_t* dst)  { TrueMotion(dst, 16); }
+static void TM4_C(uint8_t* dst)   { TrueMotion(dst, 4); }
+static void TM8uv_C(uint8_t* dst) { TrueMotion(dst, 8); }
+static void TM16_C(uint8_t* dst)  { TrueMotion(dst, 16); }
 
 //------------------------------------------------------------------------------
 // 16x16
 
-static void VE16(uint8_t* dst) {     // vertical
+static void VE16_C(uint8_t* dst) {     // vertical
   int j;
   for (j = 0; j < 16; ++j) {
     memcpy(dst + j * BPS, dst - BPS, 16);
   }
 }
 
-static void HE16(uint8_t* dst) {     // horizontal
+static void HE16_C(uint8_t* dst) {     // horizontal
   int j;
   for (j = 16; j > 0; --j) {
     memset(dst, dst[-1], 16);
@@ -203,7 +212,7 @@ static WEBP_INLINE void Put16(int v, uint8_t* dst) {
   }
 }
 
-static void DC16(uint8_t* dst) {    // DC
+static void DC16_C(uint8_t* dst) {    // DC
   int DC = 16;
   int j;
   for (j = 0; j < 16; ++j) {
@@ -212,7 +221,7 @@ static void DC16(uint8_t* dst) {    // DC
   Put16(DC >> 5, dst);
 }
 
-static void DC16NoTop(uint8_t* dst) {   // DC with top samples not available
+static void DC16NoTop_C(uint8_t* dst) {   // DC with top samples not available
   int DC = 8;
   int j;
   for (j = 0; j < 16; ++j) {
@@ -221,7 +230,7 @@ static void DC16NoTop(uint8_t* dst) {   // DC with top samples not available
   Put16(DC >> 4, dst);
 }
 
-static void DC16NoLeft(uint8_t* dst) {  // DC with left samples not available
+static void DC16NoLeft_C(uint8_t* dst) {  // DC with left samples not available
   int DC = 8;
   int i;
   for (i = 0; i < 16; ++i) {
@@ -230,9 +239,10 @@ static void DC16NoLeft(uint8_t* dst) {  // DC with left samples not available
   Put16(DC >> 4, dst);
 }
 
-static void DC16NoTopLeft(uint8_t* dst) {  // DC with no top and left samples
+static void DC16NoTopLeft_C(uint8_t* dst) {  // DC with no top and left samples
   Put16(0x80, dst);
 }
+#endif  // !WEBP_NEON_OMIT_C_CODE
 
 VP8PredFunc VP8PredLuma16[NUM_B_DC_MODES];
 
@@ -242,7 +252,8 @@ VP8PredFunc VP8PredLuma16[NUM_B_DC_MODES];
 #define AVG3(a, b, c) ((uint8_t)(((a) + 2 * (b) + (c) + 2) >> 2))
 #define AVG2(a, b) (((a) + (b) + 1) >> 1)
 
-static void VE4(uint8_t* dst) {    // vertical
+#if !WEBP_NEON_OMIT_C_CODE
+static void VE4_C(uint8_t* dst) {    // vertical
   const uint8_t* top = dst - BPS;
   const uint8_t vals[4] = {
     AVG3(top[-1], top[0], top[1]),
@@ -255,8 +266,9 @@ static void VE4(uint8_t* dst) {    // vertical
     memcpy(dst + i * BPS, vals, sizeof(vals));
   }
 }
+#endif  // !WEBP_NEON_OMIT_C_CODE
 
-static void HE4(uint8_t* dst) {    // horizontal
+static void HE4_C(uint8_t* dst) {    // horizontal
   const int A = dst[-1 - BPS];
   const int B = dst[-1];
   const int C = dst[-1 + BPS];
@@ -268,7 +280,8 @@ static void HE4(uint8_t* dst) {    // horizontal
   WebPUint32ToMem(dst + 3 * BPS, 0x01010101U * AVG3(D, E, E));
 }
 
-static void DC4(uint8_t* dst) {   // DC
+#if !WEBP_NEON_OMIT_C_CODE
+static void DC4_C(uint8_t* dst) {   // DC
   uint32_t dc = 4;
   int i;
   for (i = 0; i < 4; ++i) dc += dst[i - BPS] + dst[-1 + i * BPS];
@@ -276,7 +289,7 @@ static void DC4(uint8_t* dst) {   // DC
   for (i = 0; i < 4; ++i) memset(dst + i * BPS, dc, 4);
 }
 
-static void RD4(uint8_t* dst) {   // Down-right
+static void RD4_C(uint8_t* dst) {   // Down-right
   const int I = dst[-1 + 0 * BPS];
   const int J = dst[-1 + 1 * BPS];
   const int K = dst[-1 + 2 * BPS];
@@ -295,7 +308,7 @@ static void RD4(uint8_t* dst) {   // Down-right
                                       DST(3, 0) = AVG3(D, C, B);
 }
 
-static void LD4(uint8_t* dst) {   // Down-Left
+static void LD4_C(uint8_t* dst) {   // Down-Left
   const int A = dst[0 - BPS];
   const int B = dst[1 - BPS];
   const int C = dst[2 - BPS];
@@ -312,8 +325,9 @@ static void LD4(uint8_t* dst) {   // Down-Left
                           DST(3, 2) = DST(2, 3) = AVG3(F, G, H);
                                       DST(3, 3) = AVG3(G, H, H);
 }
+#endif  // !WEBP_NEON_OMIT_C_CODE
 
-static void VR4(uint8_t* dst) {   // Vertical-Right
+static void VR4_C(uint8_t* dst) {   // Vertical-Right
   const int I = dst[-1 + 0 * BPS];
   const int J = dst[-1 + 1 * BPS];
   const int K = dst[-1 + 2 * BPS];
@@ -335,7 +349,7 @@ static void VR4(uint8_t* dst) {   // Vertical-Right
   DST(3, 1) =             AVG3(B, C, D);
 }
 
-static void VL4(uint8_t* dst) {   // Vertical-Left
+static void VL4_C(uint8_t* dst) {   // Vertical-Left
   const int A = dst[0 - BPS];
   const int B = dst[1 - BPS];
   const int C = dst[2 - BPS];
@@ -357,7 +371,7 @@ static void VL4(uint8_t* dst) {   // Vertical-Left
               DST(3, 3) = AVG3(F, G, H);
 }
 
-static void HU4(uint8_t* dst) {   // Horizontal-Up
+static void HU4_C(uint8_t* dst) {   // Horizontal-Up
   const int I = dst[-1 + 0 * BPS];
   const int J = dst[-1 + 1 * BPS];
   const int K = dst[-1 + 2 * BPS];
@@ -372,7 +386,7 @@ static void HU4(uint8_t* dst) {   // Horizontal-Up
     DST(0, 3) = DST(1, 3) = DST(2, 3) = DST(3, 3) = L;
 }
 
-static void HD4(uint8_t* dst) {  // Horizontal-Down
+static void HD4_C(uint8_t* dst) {  // Horizontal-Down
   const int I = dst[-1 + 0 * BPS];
   const int J = dst[-1 + 1 * BPS];
   const int K = dst[-1 + 2 * BPS];
@@ -404,14 +418,15 @@ VP8PredFunc VP8PredLuma4[NUM_BMODES];
 //------------------------------------------------------------------------------
 // Chroma
 
-static void VE8uv(uint8_t* dst) {    // vertical
+#if !WEBP_NEON_OMIT_C_CODE
+static void VE8uv_C(uint8_t* dst) {    // vertical
   int j;
   for (j = 0; j < 8; ++j) {
     memcpy(dst + j * BPS, dst - BPS, 8);
   }
 }
 
-static void HE8uv(uint8_t* dst) {    // horizontal
+static void HE8uv_C(uint8_t* dst) {    // horizontal
   int j;
   for (j = 0; j < 8; ++j) {
     memset(dst, dst[-1], 8);
@@ -427,7 +442,7 @@ static WEBP_INLINE void Put8x8uv(uint8_t value, uint8_t* dst) {
   }
 }
 
-static void DC8uv(uint8_t* dst) {     // DC
+static void DC8uv_C(uint8_t* dst) {     // DC
   int dc0 = 8;
   int i;
   for (i = 0; i < 8; ++i) {
@@ -436,7 +451,7 @@ static void DC8uv(uint8_t* dst) {     // DC
   Put8x8uv(dc0 >> 4, dst);
 }
 
-static void DC8uvNoLeft(uint8_t* dst) {   // DC with no left samples
+static void DC8uvNoLeft_C(uint8_t* dst) {   // DC with no left samples
   int dc0 = 4;
   int i;
   for (i = 0; i < 8; ++i) {
@@ -445,7 +460,7 @@ static void DC8uvNoLeft(uint8_t* dst) {   // DC with no left samples
   Put8x8uv(dc0 >> 3, dst);
 }
 
-static void DC8uvNoTop(uint8_t* dst) {  // DC with no top samples
+static void DC8uvNoTop_C(uint8_t* dst) {  // DC with no top samples
   int dc0 = 4;
   int i;
   for (i = 0; i < 8; ++i) {
@@ -454,17 +469,19 @@ static void DC8uvNoTop(uint8_t* dst) {  // DC with no top samples
   Put8x8uv(dc0 >> 3, dst);
 }
 
-static void DC8uvNoTopLeft(uint8_t* dst) {    // DC with nothing
+static void DC8uvNoTopLeft_C(uint8_t* dst) {    // DC with nothing
   Put8x8uv(0x80, dst);
 }
+#endif  // !WEBP_NEON_OMIT_C_CODE
 
 VP8PredFunc VP8PredChroma8[NUM_B_DC_MODES];
 
 //------------------------------------------------------------------------------
 // Edge filtering functions
 
+#if !WEBP_NEON_OMIT_C_CODE || WEBP_NEON_WORK_AROUND_GCC
 // 4 pixels in, 2 pixels out
-static WEBP_INLINE void do_filter2(uint8_t* p, int step) {
+static WEBP_INLINE void DoFilter2_C(uint8_t* p, int step) {
   const int p1 = p[-2*step], p0 = p[-step], q0 = p[0], q1 = p[step];
   const int a = 3 * (q0 - p0) + VP8ksclip1[p1 - q1];  // in [-893,892]
   const int a1 = VP8ksclip2[(a + 4) >> 3];            // in [-16,15]
@@ -474,7 +491,7 @@ static WEBP_INLINE void do_filter2(uint8_t* p, int step) {
 }
 
 // 4 pixels in, 4 pixels out
-static WEBP_INLINE void do_filter4(uint8_t* p, int step) {
+static WEBP_INLINE void DoFilter4_C(uint8_t* p, int step) {
   const int p1 = p[-2*step], p0 = p[-step], q0 = p[0], q1 = p[step];
   const int a = 3 * (q0 - p0);
   const int a1 = VP8ksclip2[(a + 4) >> 3];
@@ -487,7 +504,7 @@ static WEBP_INLINE void do_filter4(uint8_t* p, int step) {
 }
 
 // 6 pixels in, 6 pixels out
-static WEBP_INLINE void do_filter6(uint8_t* p, int step) {
+static WEBP_INLINE void DoFilter6_C(uint8_t* p, int step) {
   const int p2 = p[-3*step], p1 = p[-2*step], p0 = p[-step];
   const int q0 = p[0], q1 = p[step], q2 = p[2*step];
   const int a = VP8ksclip1[3 * (q0 - p0) + VP8ksclip1[p1 - q1]];
@@ -503,18 +520,22 @@ static WEBP_INLINE void do_filter6(uint8_t* p, int step) {
   p[ 2*step] = VP8kclip1[q2 - a3];
 }
 
-static WEBP_INLINE int hev(const uint8_t* p, int step, int thresh) {
+static WEBP_INLINE int Hev(const uint8_t* p, int step, int thresh) {
   const int p1 = p[-2*step], p0 = p[-step], q0 = p[0], q1 = p[step];
   return (VP8kabs0[p1 - p0] > thresh) || (VP8kabs0[q1 - q0] > thresh);
 }
+#endif  // !WEBP_NEON_OMIT_C_CODE || WEBP_NEON_WORK_AROUND_GCC
 
-static WEBP_INLINE int needs_filter(const uint8_t* p, int step, int t) {
+#if !WEBP_NEON_OMIT_C_CODE
+static WEBP_INLINE int NeedsFilter_C(const uint8_t* p, int step, int t) {
   const int p1 = p[-2 * step], p0 = p[-step], q0 = p[0], q1 = p[step];
   return ((4 * VP8kabs0[p0 - q0] + VP8kabs0[p1 - q1]) <= t);
 }
+#endif  // !WEBP_NEON_OMIT_C_CODE
 
-static WEBP_INLINE int needs_filter2(const uint8_t* p,
-                                     int step, int t, int it) {
+#if !WEBP_NEON_OMIT_C_CODE || WEBP_NEON_WORK_AROUND_GCC
+static WEBP_INLINE int NeedsFilter2_C(const uint8_t* p,
+                                      int step, int t, int it) {
   const int p3 = p[-4 * step], p2 = p[-3 * step], p1 = p[-2 * step];
   const int p0 = p[-step], q0 = p[0];
   const int q1 = p[step], q2 = p[2 * step], q3 = p[3 * step];
@@ -523,140 +544,159 @@ static WEBP_INLINE int needs_filter2(const uint8_t* p,
          VP8kabs0[p1 - p0] <= it && VP8kabs0[q3 - q2] <= it &&
          VP8kabs0[q2 - q1] <= it && VP8kabs0[q1 - q0] <= it;
 }
+#endif  // !WEBP_NEON_OMIT_C_CODE || WEBP_NEON_WORK_AROUND_GCC
 
 //------------------------------------------------------------------------------
 // Simple In-loop filtering (Paragraph 15.2)
 
-static void SimpleVFilter16(uint8_t* p, int stride, int thresh) {
+#if !WEBP_NEON_OMIT_C_CODE
+static void SimpleVFilter16_C(uint8_t* p, int stride, int thresh) {
   int i;
   const int thresh2 = 2 * thresh + 1;
   for (i = 0; i < 16; ++i) {
-    if (needs_filter(p + i, stride, thresh2)) {
-      do_filter2(p + i, stride);
+    if (NeedsFilter_C(p + i, stride, thresh2)) {
+      DoFilter2_C(p + i, stride);
     }
   }
 }
 
-static void SimpleHFilter16(uint8_t* p, int stride, int thresh) {
+static void SimpleHFilter16_C(uint8_t* p, int stride, int thresh) {
   int i;
   const int thresh2 = 2 * thresh + 1;
   for (i = 0; i < 16; ++i) {
-    if (needs_filter(p + i * stride, 1, thresh2)) {
-      do_filter2(p + i * stride, 1);
+    if (NeedsFilter_C(p + i * stride, 1, thresh2)) {
+      DoFilter2_C(p + i * stride, 1);
     }
   }
 }
 
-static void SimpleVFilter16i(uint8_t* p, int stride, int thresh) {
+static void SimpleVFilter16i_C(uint8_t* p, int stride, int thresh) {
   int k;
   for (k = 3; k > 0; --k) {
     p += 4 * stride;
-    SimpleVFilter16(p, stride, thresh);
+    SimpleVFilter16_C(p, stride, thresh);
   }
 }
 
-static void SimpleHFilter16i(uint8_t* p, int stride, int thresh) {
+static void SimpleHFilter16i_C(uint8_t* p, int stride, int thresh) {
   int k;
   for (k = 3; k > 0; --k) {
     p += 4;
-    SimpleHFilter16(p, stride, thresh);
+    SimpleHFilter16_C(p, stride, thresh);
   }
 }
+#endif  // !WEBP_NEON_OMIT_C_CODE
 
 //------------------------------------------------------------------------------
 // Complex In-loop filtering (Paragraph 15.3)
 
-static WEBP_INLINE void FilterLoop26(uint8_t* p,
-                                     int hstride, int vstride, int size,
-                                     int thresh, int ithresh, int hev_thresh) {
+#if !WEBP_NEON_OMIT_C_CODE || WEBP_NEON_WORK_AROUND_GCC
+static WEBP_INLINE void FilterLoop26_C(uint8_t* p,
+                                       int hstride, int vstride, int size,
+                                       int thresh, int ithresh,
+                                       int hev_thresh) {
   const int thresh2 = 2 * thresh + 1;
   while (size-- > 0) {
-    if (needs_filter2(p, hstride, thresh2, ithresh)) {
-      if (hev(p, hstride, hev_thresh)) {
-        do_filter2(p, hstride);
+    if (NeedsFilter2_C(p, hstride, thresh2, ithresh)) {
+      if (Hev(p, hstride, hev_thresh)) {
+        DoFilter2_C(p, hstride);
       } else {
-        do_filter6(p, hstride);
+        DoFilter6_C(p, hstride);
       }
     }
     p += vstride;
   }
 }
 
-static WEBP_INLINE void FilterLoop24(uint8_t* p,
-                                     int hstride, int vstride, int size,
-                                     int thresh, int ithresh, int hev_thresh) {
+static WEBP_INLINE void FilterLoop24_C(uint8_t* p,
+                                       int hstride, int vstride, int size,
+                                       int thresh, int ithresh,
+                                       int hev_thresh) {
   const int thresh2 = 2 * thresh + 1;
   while (size-- > 0) {
-    if (needs_filter2(p, hstride, thresh2, ithresh)) {
-      if (hev(p, hstride, hev_thresh)) {
-        do_filter2(p, hstride);
+    if (NeedsFilter2_C(p, hstride, thresh2, ithresh)) {
+      if (Hev(p, hstride, hev_thresh)) {
+        DoFilter2_C(p, hstride);
       } else {
-        do_filter4(p, hstride);
+        DoFilter4_C(p, hstride);
       }
     }
     p += vstride;
   }
 }
+#endif  // !WEBP_NEON_OMIT_C_CODE || WEBP_NEON_WORK_AROUND_GCC
 
+#if !WEBP_NEON_OMIT_C_CODE
 // on macroblock edges
-static void VFilter16(uint8_t* p, int stride,
-                      int thresh, int ithresh, int hev_thresh) {
-  FilterLoop26(p, stride, 1, 16, thresh, ithresh, hev_thresh);
+static void VFilter16_C(uint8_t* p, int stride,
+                        int thresh, int ithresh, int hev_thresh) {
+  FilterLoop26_C(p, stride, 1, 16, thresh, ithresh, hev_thresh);
 }
 
-static void HFilter16(uint8_t* p, int stride,
-                      int thresh, int ithresh, int hev_thresh) {
-  FilterLoop26(p, 1, stride, 16, thresh, ithresh, hev_thresh);
+static void HFilter16_C(uint8_t* p, int stride,
+                        int thresh, int ithresh, int hev_thresh) {
+  FilterLoop26_C(p, 1, stride, 16, thresh, ithresh, hev_thresh);
 }
 
 // on three inner edges
-static void VFilter16i(uint8_t* p, int stride,
-                       int thresh, int ithresh, int hev_thresh) {
+static void VFilter16i_C(uint8_t* p, int stride,
+                         int thresh, int ithresh, int hev_thresh) {
   int k;
   for (k = 3; k > 0; --k) {
     p += 4 * stride;
-    FilterLoop24(p, stride, 1, 16, thresh, ithresh, hev_thresh);
+    FilterLoop24_C(p, stride, 1, 16, thresh, ithresh, hev_thresh);
   }
 }
+#endif  // !WEBP_NEON_OMIT_C_CODE
 
-static void HFilter16i(uint8_t* p, int stride,
-                       int thresh, int ithresh, int hev_thresh) {
+#if !WEBP_NEON_OMIT_C_CODE || WEBP_NEON_WORK_AROUND_GCC
+static void HFilter16i_C(uint8_t* p, int stride,
+                         int thresh, int ithresh, int hev_thresh) {
   int k;
   for (k = 3; k > 0; --k) {
     p += 4;
-    FilterLoop24(p, 1, stride, 16, thresh, ithresh, hev_thresh);
+    FilterLoop24_C(p, 1, stride, 16, thresh, ithresh, hev_thresh);
   }
 }
+#endif  // !WEBP_NEON_OMIT_C_CODE || WEBP_NEON_WORK_AROUND_GCC
 
+#if !WEBP_NEON_OMIT_C_CODE
 // 8-pixels wide variant, for chroma filtering
-static void VFilter8(uint8_t* u, uint8_t* v, int stride,
-                     int thresh, int ithresh, int hev_thresh) {
-  FilterLoop26(u, stride, 1, 8, thresh, ithresh, hev_thresh);
-  FilterLoop26(v, stride, 1, 8, thresh, ithresh, hev_thresh);
+static void VFilter8_C(uint8_t* u, uint8_t* v, int stride,
+                       int thresh, int ithresh, int hev_thresh) {
+  FilterLoop26_C(u, stride, 1, 8, thresh, ithresh, hev_thresh);
+  FilterLoop26_C(v, stride, 1, 8, thresh, ithresh, hev_thresh);
 }
+#endif  // !WEBP_NEON_OMIT_C_CODE
 
-static void HFilter8(uint8_t* u, uint8_t* v, int stride,
-                     int thresh, int ithresh, int hev_thresh) {
-  FilterLoop26(u, 1, stride, 8, thresh, ithresh, hev_thresh);
-  FilterLoop26(v, 1, stride, 8, thresh, ithresh, hev_thresh);
+#if !WEBP_NEON_OMIT_C_CODE || WEBP_NEON_WORK_AROUND_GCC
+static void HFilter8_C(uint8_t* u, uint8_t* v, int stride,
+                       int thresh, int ithresh, int hev_thresh) {
+  FilterLoop26_C(u, 1, stride, 8, thresh, ithresh, hev_thresh);
+  FilterLoop26_C(v, 1, stride, 8, thresh, ithresh, hev_thresh);
 }
+#endif  // !WEBP_NEON_OMIT_C_CODE || WEBP_NEON_WORK_AROUND_GCC
 
-static void VFilter8i(uint8_t* u, uint8_t* v, int stride,
-                      int thresh, int ithresh, int hev_thresh) {
-  FilterLoop24(u + 4 * stride, stride, 1, 8, thresh, ithresh, hev_thresh);
-  FilterLoop24(v + 4 * stride, stride, 1, 8, thresh, ithresh, hev_thresh);
+#if !WEBP_NEON_OMIT_C_CODE
+static void VFilter8i_C(uint8_t* u, uint8_t* v, int stride,
+                        int thresh, int ithresh, int hev_thresh) {
+  FilterLoop24_C(u + 4 * stride, stride, 1, 8, thresh, ithresh, hev_thresh);
+  FilterLoop24_C(v + 4 * stride, stride, 1, 8, thresh, ithresh, hev_thresh);
 }
+#endif  // !WEBP_NEON_OMIT_C_CODE
 
-static void HFilter8i(uint8_t* u, uint8_t* v, int stride,
-                      int thresh, int ithresh, int hev_thresh) {
-  FilterLoop24(u + 4, 1, stride, 8, thresh, ithresh, hev_thresh);
-  FilterLoop24(v + 4, 1, stride, 8, thresh, ithresh, hev_thresh);
+#if !WEBP_NEON_OMIT_C_CODE || WEBP_NEON_WORK_AROUND_GCC
+static void HFilter8i_C(uint8_t* u, uint8_t* v, int stride,
+                        int thresh, int ithresh, int hev_thresh) {
+  FilterLoop24_C(u + 4, 1, stride, 8, thresh, ithresh, hev_thresh);
+  FilterLoop24_C(v + 4, 1, stride, 8, thresh, ithresh, hev_thresh);
 }
+#endif  // !WEBP_NEON_OMIT_C_CODE || WEBP_NEON_WORK_AROUND_GCC
 
 //------------------------------------------------------------------------------
 
-static void DitherCombine8x8(const uint8_t* dither, uint8_t* dst,
-                             int dst_stride) {
+static void DitherCombine8x8_C(const uint8_t* dither, uint8_t* dst,
+                               int dst_stride) {
   int i, j;
   for (j = 0; j < 8; ++j) {
     for (i = 0; i < 8; ++i) {
@@ -701,62 +741,69 @@ extern void VP8DspInitMIPS32(void);
 extern void VP8DspInitMIPSdspR2(void);
 extern void VP8DspInitMSA(void);
 
-static volatile VP8CPUInfo dec_last_cpuinfo_used =
-    (VP8CPUInfo)&dec_last_cpuinfo_used;
+WEBP_DSP_INIT_FUNC(VP8DspInit) {
+  VP8InitClipTables();
 
-WEBP_TSAN_IGNORE_FUNCTION void VP8DspInit(void) {
-  if (dec_last_cpuinfo_used == VP8GetCPUInfo) return;
+#if !WEBP_NEON_OMIT_C_CODE
+  VP8TransformWHT = TransformWHT_C;
+  VP8Transform = TransformTwo_C;
+  VP8TransformDC = TransformDC_C;
+  VP8TransformAC3 = TransformAC3_C;
+#endif
+  VP8TransformUV = TransformUV_C;
+  VP8TransformDCUV = TransformDCUV_C;
+
+#if !WEBP_NEON_OMIT_C_CODE
+  VP8VFilter16 = VFilter16_C;
+  VP8VFilter16i = VFilter16i_C;
+  VP8HFilter16 = HFilter16_C;
+  VP8VFilter8 = VFilter8_C;
+  VP8VFilter8i = VFilter8i_C;
+  VP8SimpleVFilter16 = SimpleVFilter16_C;
+  VP8SimpleHFilter16 = SimpleHFilter16_C;
+  VP8SimpleVFilter16i = SimpleVFilter16i_C;
+  VP8SimpleHFilter16i = SimpleHFilter16i_C;
+#endif
 
-  VP8InitClipTables();
+#if !WEBP_NEON_OMIT_C_CODE || WEBP_NEON_WORK_AROUND_GCC
+  VP8HFilter16i = HFilter16i_C;
+  VP8HFilter8 = HFilter8_C;
+  VP8HFilter8i = HFilter8i_C;
+#endif
+
+#if !WEBP_NEON_OMIT_C_CODE
+  VP8PredLuma4[0] = DC4_C;
+  VP8PredLuma4[1] = TM4_C;
+  VP8PredLuma4[2] = VE4_C;
+  VP8PredLuma4[4] = RD4_C;
+  VP8PredLuma4[6] = LD4_C;
+#endif
+
+  VP8PredLuma4[3] = HE4_C;
+  VP8PredLuma4[5] = VR4_C;
+  VP8PredLuma4[7] = VL4_C;
+  VP8PredLuma4[8] = HD4_C;
+  VP8PredLuma4[9] = HU4_C;
+
+#if !WEBP_NEON_OMIT_C_CODE
+  VP8PredLuma16[0] = DC16_C;
+  VP8PredLuma16[1] = TM16_C;
+  VP8PredLuma16[2] = VE16_C;
+  VP8PredLuma16[3] = HE16_C;
+  VP8PredLuma16[4] = DC16NoTop_C;
+  VP8PredLuma16[5] = DC16NoLeft_C;
+  VP8PredLuma16[6] = DC16NoTopLeft_C;
+
+  VP8PredChroma8[0] = DC8uv_C;
+  VP8PredChroma8[1] = TM8uv_C;
+  VP8PredChroma8[2] = VE8uv_C;
+  VP8PredChroma8[3] = HE8uv_C;
+  VP8PredChroma8[4] = DC8uvNoTop_C;
+  VP8PredChroma8[5] = DC8uvNoLeft_C;
+  VP8PredChroma8[6] = DC8uvNoTopLeft_C;
+#endif
 
-  VP8TransformWHT = TransformWHT;
-  VP8Transform = TransformTwo;
-  VP8TransformUV = TransformUV;
-  VP8TransformDC = TransformDC;
-  VP8TransformDCUV = TransformDCUV;
-  VP8TransformAC3 = TransformAC3;
-
-  VP8VFilter16 = VFilter16;
-  VP8HFilter16 = HFilter16;
-  VP8VFilter8 = VFilter8;
-  VP8HFilter8 = HFilter8;
-  VP8VFilter16i = VFilter16i;
-  VP8HFilter16i = HFilter16i;
-  VP8VFilter8i = VFilter8i;
-  VP8HFilter8i = HFilter8i;
-  VP8SimpleVFilter16 = SimpleVFilter16;
-  VP8SimpleHFilter16 = SimpleHFilter16;
-  VP8SimpleVFilter16i = SimpleVFilter16i;
-  VP8SimpleHFilter16i = SimpleHFilter16i;
-
-  VP8PredLuma4[0] = DC4;
-  VP8PredLuma4[1] = TM4;
-  VP8PredLuma4[2] = VE4;
-  VP8PredLuma4[3] = HE4;
-  VP8PredLuma4[4] = RD4;
-  VP8PredLuma4[5] = VR4;
-  VP8PredLuma4[6] = LD4;
-  VP8PredLuma4[7] = VL4;
-  VP8PredLuma4[8] = HD4;
-  VP8PredLuma4[9] = HU4;
-
-  VP8PredLuma16[0] = DC16;
-  VP8PredLuma16[1] = TM16;
-  VP8PredLuma16[2] = VE16;
-  VP8PredLuma16[3] = HE16;
-  VP8PredLuma16[4] = DC16NoTop;
-  VP8PredLuma16[5] = DC16NoLeft;
-  VP8PredLuma16[6] = DC16NoTopLeft;
-
-  VP8PredChroma8[0] = DC8uv;
-  VP8PredChroma8[1] = TM8uv;
-  VP8PredChroma8[2] = VE8uv;
-  VP8PredChroma8[3] = HE8uv;
-  VP8PredChroma8[4] = DC8uvNoTop;
-  VP8PredChroma8[5] = DC8uvNoLeft;
-  VP8PredChroma8[6] = DC8uvNoTopLeft;
-
-  VP8DitherCombine8x8 = DitherCombine8x8;
+  VP8DitherCombine8x8 = DitherCombine8x8_C;
 
   // If defined, use CPUInfo() to overwrite some pointers with faster versions.
   if (VP8GetCPUInfo != NULL) {
@@ -770,11 +817,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8DspInit(void) {
 #endif
     }
 #endif
-#if defined(WEBP_USE_NEON)
-    if (VP8GetCPUInfo(kNEON)) {
-      VP8DspInitNEON();
-    }
-#endif
 #if defined(WEBP_USE_MIPS32)
     if (VP8GetCPUInfo(kMIPS32)) {
       VP8DspInitMIPS32();
@@ -791,5 +833,55 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8DspInit(void) {
     }
 #endif
   }
-  dec_last_cpuinfo_used = VP8GetCPUInfo;
+
+#if defined(WEBP_USE_NEON)
+  if (WEBP_NEON_OMIT_C_CODE ||
+      (VP8GetCPUInfo != NULL && VP8GetCPUInfo(kNEON))) {
+    VP8DspInitNEON();
+  }
+#endif
+
+  assert(VP8TransformWHT != NULL);
+  assert(VP8Transform != NULL);
+  assert(VP8TransformDC != NULL);
+  assert(VP8TransformAC3 != NULL);
+  assert(VP8TransformUV != NULL);
+  assert(VP8TransformDCUV != NULL);
+  assert(VP8VFilter16 != NULL);
+  assert(VP8HFilter16 != NULL);
+  assert(VP8VFilter8 != NULL);
+  assert(VP8HFilter8 != NULL);
+  assert(VP8VFilter16i != NULL);
+  assert(VP8HFilter16i != NULL);
+  assert(VP8VFilter8i != NULL);
+  assert(VP8HFilter8i != NULL);
+  assert(VP8SimpleVFilter16 != NULL);
+  assert(VP8SimpleHFilter16 != NULL);
+  assert(VP8SimpleVFilter16i != NULL);
+  assert(VP8SimpleHFilter16i != NULL);
+  assert(VP8PredLuma4[0] != NULL);
+  assert(VP8PredLuma4[1] != NULL);
+  assert(VP8PredLuma4[2] != NULL);
+  assert(VP8PredLuma4[3] != NULL);
+  assert(VP8PredLuma4[4] != NULL);
+  assert(VP8PredLuma4[5] != NULL);
+  assert(VP8PredLuma4[6] != NULL);
+  assert(VP8PredLuma4[7] != NULL);
+  assert(VP8PredLuma4[8] != NULL);
+  assert(VP8PredLuma4[9] != NULL);
+  assert(VP8PredLuma16[0] != NULL);
+  assert(VP8PredLuma16[1] != NULL);
+  assert(VP8PredLuma16[2] != NULL);
+  assert(VP8PredLuma16[3] != NULL);
+  assert(VP8PredLuma16[4] != NULL);
+  assert(VP8PredLuma16[5] != NULL);
+  assert(VP8PredLuma16[6] != NULL);
+  assert(VP8PredChroma8[0] != NULL);
+  assert(VP8PredChroma8[1] != NULL);
+  assert(VP8PredChroma8[2] != NULL);
+  assert(VP8PredChroma8[3] != NULL);
+  assert(VP8PredChroma8[4] != NULL);
+  assert(VP8PredChroma8[5] != NULL);
+  assert(VP8PredChroma8[6] != NULL);
+  assert(VP8DitherCombine8x8 != NULL);
 }
diff --git a/media/libwebp/dsp/dec_clip_tables.c b/media/libwebp/dsp/dec_clip_tables.c
index 74ba34c0bb..9c86011d26 100644
--- a/media/libwebp/dsp/dec_clip_tables.c
+++ b/media/libwebp/dsp/dec_clip_tables.c
@@ -11,11 +11,14 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#include "./dsp.h"
+#include "../dsp/dsp.h"
 
-#define USE_STATIC_TABLES     // undefine to have run-time table initialization
+// define to 0 to have run-time table initialization
+#if !defined(USE_STATIC_TABLES)
+#define USE_STATIC_TABLES 1   // ALTERNATE_CODE
+#endif
 
-#ifdef USE_STATIC_TABLES
+#if (USE_STATIC_TABLES == 1)
 
 static const uint8_t abs0[255 + 255 + 1] = {
   0xff, 0xfe, 0xfd, 0xfc, 0xfb, 0xfa, 0xf9, 0xf8, 0xf7, 0xf6, 0xf5, 0xf4,
@@ -337,7 +340,7 @@ static uint8_t clip1[255 + 511 + 1];
 // and make sure it's set to true _last_ (so as to be thread-safe)
 static volatile int tables_ok = 0;
 
-#endif
+#endif    // USE_STATIC_TABLES
 
 const int8_t* const VP8ksclip1 = (const int8_t*)&sclip1[1020];
 const int8_t* const VP8ksclip2 = (const int8_t*)&sclip2[112];
@@ -345,7 +348,7 @@ const uint8_t* const VP8kclip1 = &clip1[255];
 const uint8_t* const VP8kabs0 = &abs0[255];
 
 WEBP_TSAN_IGNORE_FUNCTION void VP8InitClipTables(void) {
-#if !defined(USE_STATIC_TABLES)
+#if (USE_STATIC_TABLES == 0)
   int i;
   if (!tables_ok) {
     for (i = -255; i <= 255; ++i) {
diff --git a/media/libwebp/dsp/dec_neon.c b/media/libwebp/dsp/dec_neon.c
index 34796cf4a2..e8341327e4 100644
--- a/media/libwebp/dsp/dec_neon.c
+++ b/media/libwebp/dsp/dec_neon.c
@@ -12,43 +12,23 @@
 // Authors: Somnath Banerjee (somnath@google.com)
 //          Johann Koenig (johannkoenig@google.com)
 
-#include "./dsp.h"
+#include "../dsp/dsp.h"
 
 #if defined(WEBP_USE_NEON)
 
-#include "./neon.h"
+#include "../dsp/neon.h"
 #include "../dec/vp8i_dec.h"
 
 //------------------------------------------------------------------------------
 // NxM Loading functions
 
-// Load/Store vertical edge
-#define LOAD8x4(c1, c2, c3, c4, b1, b2, stride)                                \
-  "vld4.8 {" #c1 "[0]," #c2 "[0]," #c3 "[0]," #c4 "[0]}," #b1 "," #stride "\n" \
-  "vld4.8 {" #c1 "[1]," #c2 "[1]," #c3 "[1]," #c4 "[1]}," #b2 "," #stride "\n" \
-  "vld4.8 {" #c1 "[2]," #c2 "[2]," #c3 "[2]," #c4 "[2]}," #b1 "," #stride "\n" \
-  "vld4.8 {" #c1 "[3]," #c2 "[3]," #c3 "[3]," #c4 "[3]}," #b2 "," #stride "\n" \
-  "vld4.8 {" #c1 "[4]," #c2 "[4]," #c3 "[4]," #c4 "[4]}," #b1 "," #stride "\n" \
-  "vld4.8 {" #c1 "[5]," #c2 "[5]," #c3 "[5]," #c4 "[5]}," #b2 "," #stride "\n" \
-  "vld4.8 {" #c1 "[6]," #c2 "[6]," #c3 "[6]," #c4 "[6]}," #b1 "," #stride "\n" \
-  "vld4.8 {" #c1 "[7]," #c2 "[7]," #c3 "[7]," #c4 "[7]}," #b2 "," #stride "\n"
-
-#define STORE8x2(c1, c2, p, stride)                                            \
-  "vst2.8   {" #c1 "[0], " #c2 "[0]}," #p "," #stride " \n"                    \
-  "vst2.8   {" #c1 "[1], " #c2 "[1]}," #p "," #stride " \n"                    \
-  "vst2.8   {" #c1 "[2], " #c2 "[2]}," #p "," #stride " \n"                    \
-  "vst2.8   {" #c1 "[3], " #c2 "[3]}," #p "," #stride " \n"                    \
-  "vst2.8   {" #c1 "[4], " #c2 "[4]}," #p "," #stride " \n"                    \
-  "vst2.8   {" #c1 "[5], " #c2 "[5]}," #p "," #stride " \n"                    \
-  "vst2.8   {" #c1 "[6], " #c2 "[6]}," #p "," #stride " \n"                    \
-  "vst2.8   {" #c1 "[7], " #c2 "[7]}," #p "," #stride " \n"
-
 #if !defined(WORK_AROUND_GCC)
 
 // This intrinsics version makes gcc-4.6.3 crash during Load4x??() compilation
 // (register alloc, probably). The variants somewhat mitigate the problem, but
 // not quite. HFilter16i() remains problematic.
-static WEBP_INLINE uint8x8x4_t Load4x8(const uint8_t* const src, int stride) {
+static WEBP_INLINE uint8x8x4_t Load4x8_NEON(const uint8_t* const src,
+                                            int stride) {
   const uint8x8_t zero = vdup_n_u8(0);
   uint8x8x4_t out;
   INIT_VECTOR4(out, zero, zero, zero, zero);
@@ -63,13 +43,15 @@ static WEBP_INLINE uint8x8x4_t Load4x8(const uint8_t* const src, int stride) {
   return out;
 }
 
-static WEBP_INLINE void Load4x16(const uint8_t* const src, int stride,
-                                 uint8x16_t* const p1, uint8x16_t* const p0,
-                                 uint8x16_t* const q0, uint8x16_t* const q1) {
+static WEBP_INLINE void Load4x16_NEON(const uint8_t* const src, int stride,
+                                      uint8x16_t* const p1,
+                                      uint8x16_t* const p0,
+                                      uint8x16_t* const q0,
+                                      uint8x16_t* const q1) {
   // row0 = p1[0..7]|p0[0..7]|q0[0..7]|q1[0..7]
   // row8 = p1[8..15]|p0[8..15]|q0[8..15]|q1[8..15]
-  const uint8x8x4_t row0 = Load4x8(src - 2 + 0 * stride, stride);
-  const uint8x8x4_t row8 = Load4x8(src - 2 + 8 * stride, stride);
+  const uint8x8x4_t row0 = Load4x8_NEON(src - 2 + 0 * stride, stride);
+  const uint8x8x4_t row8 = Load4x8_NEON(src - 2 + 8 * stride, stride);
   *p1 = vcombine_u8(row0.val[0], row8.val[0]);
   *p0 = vcombine_u8(row0.val[1], row8.val[1]);
   *q0 = vcombine_u8(row0.val[2], row8.val[2]);
@@ -83,9 +65,11 @@ static WEBP_INLINE void Load4x16(const uint8_t* const src, int stride,
   src += stride;                                                     \
 } while (0)
 
-static WEBP_INLINE void Load4x16(const uint8_t* src, int stride,
-                                 uint8x16_t* const p1, uint8x16_t* const p0,
-                                 uint8x16_t* const q0, uint8x16_t* const q1) {
+static WEBP_INLINE void Load4x16_NEON(const uint8_t* src, int stride,
+                                      uint8x16_t* const p1,
+                                      uint8x16_t* const p0,
+                                      uint8x16_t* const q0,
+                                      uint8x16_t* const q1) {
   const uint32x4_t zero = vdupq_n_u32(0);
   uint32x4x4_t in;
   INIT_VECTOR4(in, zero, zero, zero, zero);
@@ -126,40 +110,40 @@ static WEBP_INLINE void Load4x16(const uint8_t* src, int stride,
 
 #endif  // !WORK_AROUND_GCC
 
-static WEBP_INLINE void Load8x16(const uint8_t* const src, int stride,
-                                 uint8x16_t* const p3, uint8x16_t* const p2,
-                                 uint8x16_t* const p1, uint8x16_t* const p0,
-                                 uint8x16_t* const q0, uint8x16_t* const q1,
-                                 uint8x16_t* const q2, uint8x16_t* const q3) {
-  Load4x16(src - 2, stride, p3, p2, p1, p0);
-  Load4x16(src + 2, stride, q0, q1, q2, q3);
+static WEBP_INLINE void Load8x16_NEON(
+    const uint8_t* const src, int stride,
+    uint8x16_t* const p3, uint8x16_t* const p2, uint8x16_t* const p1,
+    uint8x16_t* const p0, uint8x16_t* const q0, uint8x16_t* const q1,
+    uint8x16_t* const q2, uint8x16_t* const q3) {
+  Load4x16_NEON(src - 2, stride, p3, p2, p1, p0);
+  Load4x16_NEON(src + 2, stride, q0, q1, q2, q3);
 }
 
-static WEBP_INLINE void Load16x4(const uint8_t* const src, int stride,
-                                 uint8x16_t* const p1, uint8x16_t* const p0,
-                                 uint8x16_t* const q0, uint8x16_t* const q1) {
+static WEBP_INLINE void Load16x4_NEON(const uint8_t* const src, int stride,
+                                      uint8x16_t* const p1,
+                                      uint8x16_t* const p0,
+                                      uint8x16_t* const q0,
+                                      uint8x16_t* const q1) {
   *p1 = vld1q_u8(src - 2 * stride);
   *p0 = vld1q_u8(src - 1 * stride);
   *q0 = vld1q_u8(src + 0 * stride);
   *q1 = vld1q_u8(src + 1 * stride);
 }
 
-static WEBP_INLINE void Load16x8(const uint8_t* const src, int stride,
-                                 uint8x16_t* const p3, uint8x16_t* const p2,
-                                 uint8x16_t* const p1, uint8x16_t* const p0,
-                                 uint8x16_t* const q0, uint8x16_t* const q1,
-                                 uint8x16_t* const q2, uint8x16_t* const q3) {
-  Load16x4(src - 2  * stride, stride, p3, p2, p1, p0);
-  Load16x4(src + 2  * stride, stride, q0, q1, q2, q3);
+static WEBP_INLINE void Load16x8_NEON(
+    const uint8_t* const src, int stride,
+    uint8x16_t* const p3, uint8x16_t* const p2, uint8x16_t* const p1,
+    uint8x16_t* const p0, uint8x16_t* const q0, uint8x16_t* const q1,
+    uint8x16_t* const q2, uint8x16_t* const q3) {
+  Load16x4_NEON(src - 2  * stride, stride, p3, p2, p1, p0);
+  Load16x4_NEON(src + 2  * stride, stride, q0, q1, q2, q3);
 }
 
-static WEBP_INLINE void Load8x8x2(const uint8_t* const u,
-                                  const uint8_t* const v,
-                                  int stride,
-                                  uint8x16_t* const p3, uint8x16_t* const p2,
-                                  uint8x16_t* const p1, uint8x16_t* const p0,
-                                  uint8x16_t* const q0, uint8x16_t* const q1,
-                                  uint8x16_t* const q2, uint8x16_t* const q3) {
+static WEBP_INLINE void Load8x8x2_NEON(
+    const uint8_t* const u, const uint8_t* const v, int stride,
+    uint8x16_t* const p3, uint8x16_t* const p2, uint8x16_t* const p1,
+    uint8x16_t* const p0, uint8x16_t* const q0, uint8x16_t* const q1,
+    uint8x16_t* const q2, uint8x16_t* const q3) {
   // We pack the 8x8 u-samples in the lower half of the uint8x16_t destination
   // and the v-samples on the higher half.
   *p3 = vcombine_u8(vld1_u8(u - 4 * stride), vld1_u8(v - 4 * stride));
@@ -177,13 +161,11 @@ static WEBP_INLINE void Load8x8x2(const uint8_t* const u,
 #define LOAD_UV_8(ROW) \
   vcombine_u8(vld1_u8(u - 4 + (ROW) * stride), vld1_u8(v - 4 + (ROW) * stride))
 
-static WEBP_INLINE void Load8x8x2T(const uint8_t* const u,
-                                   const uint8_t* const v,
-                                   int stride,
-                                   uint8x16_t* const p3, uint8x16_t* const p2,
-                                   uint8x16_t* const p1, uint8x16_t* const p0,
-                                   uint8x16_t* const q0, uint8x16_t* const q1,
-                                   uint8x16_t* const q2, uint8x16_t* const q3) {
+static WEBP_INLINE void Load8x8x2T_NEON(
+    const uint8_t* const u, const uint8_t* const v, int stride,
+    uint8x16_t* const p3, uint8x16_t* const p2, uint8x16_t* const p1,
+    uint8x16_t* const p0, uint8x16_t* const q0, uint8x16_t* const q1,
+    uint8x16_t* const q2, uint8x16_t* const q3) {
   // We pack the 8x8 u-samples in the lower half of the uint8x16_t destination
   // and the v-samples on the higher half.
   const uint8x16_t row0 = LOAD_UV_8(0);
@@ -238,8 +220,8 @@ static WEBP_INLINE void Load8x8x2T(const uint8_t* const u,
 
 #endif  // !WORK_AROUND_GCC
 
-static WEBP_INLINE void Store2x8(const uint8x8x2_t v,
-                                 uint8_t* const dst, int stride) {
+static WEBP_INLINE void Store2x8_NEON(const uint8x8x2_t v,
+                                      uint8_t* const dst, int stride) {
   vst2_lane_u8(dst + 0 * stride, v, 0);
   vst2_lane_u8(dst + 1 * stride, v, 1);
   vst2_lane_u8(dst + 2 * stride, v, 2);
@@ -250,20 +232,20 @@ static WEBP_INLINE void Store2x8(const uint8x8x2_t v,
   vst2_lane_u8(dst + 7 * stride, v, 7);
 }
 
-static WEBP_INLINE void Store2x16(const uint8x16_t p0, const uint8x16_t q0,
-                                  uint8_t* const dst, int stride) {
+static WEBP_INLINE void Store2x16_NEON(const uint8x16_t p0, const uint8x16_t q0,
+                                       uint8_t* const dst, int stride) {
   uint8x8x2_t lo, hi;
   lo.val[0] = vget_low_u8(p0);
   lo.val[1] = vget_low_u8(q0);
   hi.val[0] = vget_high_u8(p0);
   hi.val[1] = vget_high_u8(q0);
-  Store2x8(lo, dst - 1 + 0 * stride, stride);
-  Store2x8(hi, dst - 1 + 8 * stride, stride);
+  Store2x8_NEON(lo, dst - 1 + 0 * stride, stride);
+  Store2x8_NEON(hi, dst - 1 + 8 * stride, stride);
 }
 
 #if !defined(WORK_AROUND_GCC)
-static WEBP_INLINE void Store4x8(const uint8x8x4_t v,
-                                 uint8_t* const dst, int stride) {
+static WEBP_INLINE void Store4x8_NEON(const uint8x8x4_t v,
+                                      uint8_t* const dst, int stride) {
   vst4_lane_u8(dst + 0 * stride, v, 0);
   vst4_lane_u8(dst + 1 * stride, v, 1);
   vst4_lane_u8(dst + 2 * stride, v, 2);
@@ -274,9 +256,9 @@ static WEBP_INLINE void Store4x8(const uint8x8x4_t v,
   vst4_lane_u8(dst + 7 * stride, v, 7);
 }
 
-static WEBP_INLINE void Store4x16(const uint8x16_t p1, const uint8x16_t p0,
-                                  const uint8x16_t q0, const uint8x16_t q1,
-                                  uint8_t* const dst, int stride) {
+static WEBP_INLINE void Store4x16_NEON(const uint8x16_t p1, const uint8x16_t p0,
+                                       const uint8x16_t q0, const uint8x16_t q1,
+                                       uint8_t* const dst, int stride) {
   uint8x8x4_t lo, hi;
   INIT_VECTOR4(lo,
                vget_low_u8(p1), vget_low_u8(p0),
@@ -284,27 +266,28 @@ static WEBP_INLINE void Store4x16(const uint8x16_t p1, const uint8x16_t p0,
   INIT_VECTOR4(hi,
                vget_high_u8(p1), vget_high_u8(p0),
                vget_high_u8(q0), vget_high_u8(q1));
-  Store4x8(lo, dst - 2 + 0 * stride, stride);
-  Store4x8(hi, dst - 2 + 8 * stride, stride);
+  Store4x8_NEON(lo, dst - 2 + 0 * stride, stride);
+  Store4x8_NEON(hi, dst - 2 + 8 * stride, stride);
 }
 #endif  // !WORK_AROUND_GCC
 
-static WEBP_INLINE void Store16x2(const uint8x16_t p0, const uint8x16_t q0,
-                                  uint8_t* const dst, int stride) {
+static WEBP_INLINE void Store16x2_NEON(const uint8x16_t p0, const uint8x16_t q0,
+                                       uint8_t* const dst, int stride) {
   vst1q_u8(dst - stride, p0);
   vst1q_u8(dst, q0);
 }
 
-static WEBP_INLINE void Store16x4(const uint8x16_t p1, const uint8x16_t p0,
-                                  const uint8x16_t q0, const uint8x16_t q1,
-                                  uint8_t* const dst, int stride) {
-  Store16x2(p1, p0, dst - stride, stride);
-  Store16x2(q0, q1, dst + stride, stride);
+static WEBP_INLINE void Store16x4_NEON(const uint8x16_t p1, const uint8x16_t p0,
+                                       const uint8x16_t q0, const uint8x16_t q1,
+                                       uint8_t* const dst, int stride) {
+  Store16x2_NEON(p1, p0, dst - stride, stride);
+  Store16x2_NEON(q0, q1, dst + stride, stride);
 }
 
-static WEBP_INLINE void Store8x2x2(const uint8x16_t p0, const uint8x16_t q0,
-                                   uint8_t* const u, uint8_t* const v,
-                                   int stride) {
+static WEBP_INLINE void Store8x2x2_NEON(const uint8x16_t p0,
+                                        const uint8x16_t q0,
+                                        uint8_t* const u, uint8_t* const v,
+                                        int stride) {
   // p0 and q0 contain the u+v samples packed in low/high halves.
   vst1_u8(u - stride, vget_low_u8(p0));
   vst1_u8(u,          vget_low_u8(q0));
@@ -312,13 +295,15 @@ static WEBP_INLINE void Store8x2x2(const uint8x16_t p0, const uint8x16_t q0,
   vst1_u8(v,          vget_high_u8(q0));
 }
 
-static WEBP_INLINE void Store8x4x2(const uint8x16_t p1, const uint8x16_t p0,
-                                   const uint8x16_t q0, const uint8x16_t q1,
-                                   uint8_t* const u, uint8_t* const v,
-                                   int stride) {
+static WEBP_INLINE void Store8x4x2_NEON(const uint8x16_t p1,
+                                        const uint8x16_t p0,
+                                        const uint8x16_t q0,
+                                        const uint8x16_t q1,
+                                        uint8_t* const u, uint8_t* const v,
+                                        int stride) {
   // The p1...q1 registers contain the u+v samples packed in low/high halves.
-  Store8x2x2(p1, p0, u - stride, v - stride, stride);
-  Store8x2x2(q0, q1, u + stride, v + stride, stride);
+  Store8x2x2_NEON(p1, p0, u - stride, v - stride, stride);
+  Store8x2x2_NEON(q0, q1, u + stride, v + stride, stride);
 }
 
 #if !defined(WORK_AROUND_GCC)
@@ -329,11 +314,10 @@ static WEBP_INLINE void Store8x4x2(const uint8x16_t p1, const uint8x16_t p0,
   (DST) += stride;                                \
 } while (0)
 
-static WEBP_INLINE void Store6x8x2(const uint8x16_t p2, const uint8x16_t p1,
-                                   const uint8x16_t p0, const uint8x16_t q0,
-                                   const uint8x16_t q1, const uint8x16_t q2,
-                                   uint8_t* u, uint8_t* v,
-                                   int stride) {
+static WEBP_INLINE void Store6x8x2_NEON(
+    const uint8x16_t p2, const uint8x16_t p1, const uint8x16_t p0,
+    const uint8x16_t q0, const uint8x16_t q1, const uint8x16_t q2,
+    uint8_t* u, uint8_t* v, int stride) {
   uint8x8x3_t u0, u1, v0, v1;
   INIT_VECTOR3(u0, vget_low_u8(p2), vget_low_u8(p1), vget_low_u8(p0));
   INIT_VECTOR3(u1, vget_low_u8(q0), vget_low_u8(q1), vget_low_u8(q2));
@@ -358,10 +342,12 @@ static WEBP_INLINE void Store6x8x2(const uint8x16_t p2, const uint8x16_t p1,
 }
 #undef STORE6_LANE
 
-static WEBP_INLINE void Store4x8x2(const uint8x16_t p1, const uint8x16_t p0,
-                                   const uint8x16_t q0, const uint8x16_t q1,
-                                   uint8_t* const u, uint8_t* const v,
-                                   int stride) {
+static WEBP_INLINE void Store4x8x2_NEON(const uint8x16_t p1,
+                                        const uint8x16_t p0,
+                                        const uint8x16_t q0,
+                                        const uint8x16_t q1,
+                                        uint8_t* const u, uint8_t* const v,
+                                        int stride) {
   uint8x8x4_t u0, v0;
   INIT_VECTOR4(u0,
                vget_low_u8(p1), vget_low_u8(p0),
@@ -390,15 +376,15 @@ static WEBP_INLINE void Store4x8x2(const uint8x16_t p1, const uint8x16_t p0,
 #endif  // !WORK_AROUND_GCC
 
 // Zero extend 'v' to an int16x8_t.
-static WEBP_INLINE int16x8_t ConvertU8ToS16(uint8x8_t v) {
+static WEBP_INLINE int16x8_t ConvertU8ToS16_NEON(uint8x8_t v) {
   return vreinterpretq_s16_u16(vmovl_u8(v));
 }
 
 // Performs unsigned 8b saturation on 'dst01' and 'dst23' storing the result
 // to the corresponding rows of 'dst'.
-static WEBP_INLINE void SaturateAndStore4x4(uint8_t* const dst,
-                                            const int16x8_t dst01,
-                                            const int16x8_t dst23) {
+static WEBP_INLINE void SaturateAndStore4x4_NEON(uint8_t* const dst,
+                                                 const int16x8_t dst01,
+                                                 const int16x8_t dst23) {
   // Unsigned saturate to 8b.
   const uint8x8_t dst01_u8 = vqmovun_s16(dst01);
   const uint8x8_t dst23_u8 = vqmovun_s16(dst23);
@@ -410,8 +396,9 @@ static WEBP_INLINE void SaturateAndStore4x4(uint8_t* const dst,
   vst1_lane_u32((uint32_t*)(dst + 3 * BPS), vreinterpret_u32_u8(dst23_u8), 1);
 }
 
-static WEBP_INLINE void Add4x4(const int16x8_t row01, const int16x8_t row23,
-                               uint8_t* const dst) {
+static WEBP_INLINE void Add4x4_NEON(const int16x8_t row01,
+                                    const int16x8_t row23,
+                                    uint8_t* const dst) {
   uint32x2_t dst01 = vdup_n_u32(0);
   uint32x2_t dst23 = vdup_n_u32(0);
 
@@ -423,23 +410,23 @@ static WEBP_INLINE void Add4x4(const int16x8_t row01, const int16x8_t row23,
 
   {
     // Convert to 16b.
-    const int16x8_t dst01_s16 = ConvertU8ToS16(vreinterpret_u8_u32(dst01));
-    const int16x8_t dst23_s16 = ConvertU8ToS16(vreinterpret_u8_u32(dst23));
+    const int16x8_t dst01_s16 = ConvertU8ToS16_NEON(vreinterpret_u8_u32(dst01));
+    const int16x8_t dst23_s16 = ConvertU8ToS16_NEON(vreinterpret_u8_u32(dst23));
 
     // Descale with rounding.
     const int16x8_t out01 = vrsraq_n_s16(dst01_s16, row01, 3);
     const int16x8_t out23 = vrsraq_n_s16(dst23_s16, row23, 3);
     // Add the inverse transform.
-    SaturateAndStore4x4(dst, out01, out23);
+    SaturateAndStore4x4_NEON(dst, out01, out23);
   }
 }
 
 //-----------------------------------------------------------------------------
 // Simple In-loop filtering (Paragraph 15.2)
 
-static uint8x16_t NeedsFilter(const uint8x16_t p1, const uint8x16_t p0,
-                              const uint8x16_t q0, const uint8x16_t q1,
-                              int thresh) {
+static uint8x16_t NeedsFilter_NEON(const uint8x16_t p1, const uint8x16_t p0,
+                                   const uint8x16_t q0, const uint8x16_t q1,
+                                   int thresh) {
   const uint8x16_t thresh_v = vdupq_n_u8((uint8_t)thresh);
   const uint8x16_t a_p0_q0 = vabdq_u8(p0, q0);               // abs(p0-q0)
   const uint8x16_t a_p1_q1 = vabdq_u8(p1, q1);               // abs(p1-q1)
@@ -450,18 +437,18 @@ static uint8x16_t NeedsFilter(const uint8x16_t p1, const uint8x16_t p0,
   return mask;
 }
 
-static int8x16_t FlipSign(const uint8x16_t v) {
+static int8x16_t FlipSign_NEON(const uint8x16_t v) {
   const uint8x16_t sign_bit = vdupq_n_u8(0x80);
   return vreinterpretq_s8_u8(veorq_u8(v, sign_bit));
 }
 
-static uint8x16_t FlipSignBack(const int8x16_t v) {
+static uint8x16_t FlipSignBack_NEON(const int8x16_t v) {
   const int8x16_t sign_bit = vdupq_n_s8(0x80);
   return vreinterpretq_u8_s8(veorq_s8(v, sign_bit));
 }
 
-static int8x16_t GetBaseDelta(const int8x16_t p1, const int8x16_t p0,
-                              const int8x16_t q0, const int8x16_t q1) {
+static int8x16_t GetBaseDelta_NEON(const int8x16_t p1, const int8x16_t p0,
+                                   const int8x16_t q0, const int8x16_t q1) {
   const int8x16_t q0_p0 = vqsubq_s8(q0, p0);      // (q0-p0)
   const int8x16_t p1_q1 = vqsubq_s8(p1, q1);      // (p1-q1)
   const int8x16_t s1 = vqaddq_s8(p1_q1, q0_p0);   // (p1-q1) + 1 * (q0 - p0)
@@ -470,7 +457,7 @@ static int8x16_t GetBaseDelta(const int8x16_t p1, const int8x16_t p0,
   return s3;
 }
 
-static int8x16_t GetBaseDelta0(const int8x16_t p0, const int8x16_t q0) {
+static int8x16_t GetBaseDelta0_NEON(const int8x16_t p0, const int8x16_t q0) {
   const int8x16_t q0_p0 = vqsubq_s8(q0, p0);      // (q0-p0)
   const int8x16_t s1 = vqaddq_s8(q0_p0, q0_p0);   // 2 * (q0 - p0)
   const int8x16_t s2 = vqaddq_s8(q0_p0, s1);      // 3 * (q0 - p0)
@@ -479,9 +466,10 @@ static int8x16_t GetBaseDelta0(const int8x16_t p0, const int8x16_t q0) {
 
 //------------------------------------------------------------------------------
 
-static void ApplyFilter2NoFlip(const int8x16_t p0s, const int8x16_t q0s,
-                               const int8x16_t delta,
-                               int8x16_t* const op0, int8x16_t* const oq0) {
+static void ApplyFilter2NoFlip_NEON(const int8x16_t p0s, const int8x16_t q0s,
+                                    const int8x16_t delta,
+                                    int8x16_t* const op0,
+                                    int8x16_t* const oq0) {
   const int8x16_t kCst3 = vdupq_n_s8(0x03);
   const int8x16_t kCst4 = vdupq_n_s8(0x04);
   const int8x16_t delta_p3 = vqaddq_s8(delta, kCst3);
@@ -494,9 +482,9 @@ static void ApplyFilter2NoFlip(const int8x16_t p0s, const int8x16_t q0s,
 
 #if defined(WEBP_USE_INTRINSICS)
 
-static void ApplyFilter2(const int8x16_t p0s, const int8x16_t q0s,
-                         const int8x16_t delta,
-                         uint8x16_t* const op0, uint8x16_t* const oq0) {
+static void ApplyFilter2_NEON(const int8x16_t p0s, const int8x16_t q0s,
+                              const int8x16_t delta,
+                              uint8x16_t* const op0, uint8x16_t* const oq0) {
   const int8x16_t kCst3 = vdupq_n_s8(0x03);
   const int8x16_t kCst4 = vdupq_n_s8(0x04);
   const int8x16_t delta_p3 = vqaddq_s8(delta, kCst3);
@@ -505,45 +493,66 @@ static void ApplyFilter2(const int8x16_t p0s, const int8x16_t q0s,
   const int8x16_t delta4 = vshrq_n_s8(delta_p4, 3);
   const int8x16_t sp0 = vqaddq_s8(p0s, delta3);
   const int8x16_t sq0 = vqsubq_s8(q0s, delta4);
-  *op0 = FlipSignBack(sp0);
-  *oq0 = FlipSignBack(sq0);
-}
-
-static void DoFilter2(const uint8x16_t p1, const uint8x16_t p0,
-                      const uint8x16_t q0, const uint8x16_t q1,
-                      const uint8x16_t mask,
-                      uint8x16_t* const op0, uint8x16_t* const oq0) {
-  const int8x16_t p1s = FlipSign(p1);
-  const int8x16_t p0s = FlipSign(p0);
-  const int8x16_t q0s = FlipSign(q0);
-  const int8x16_t q1s = FlipSign(q1);
-  const int8x16_t delta0 = GetBaseDelta(p1s, p0s, q0s, q1s);
+  *op0 = FlipSignBack_NEON(sp0);
+  *oq0 = FlipSignBack_NEON(sq0);
+}
+
+static void DoFilter2_NEON(const uint8x16_t p1, const uint8x16_t p0,
+                           const uint8x16_t q0, const uint8x16_t q1,
+                           const uint8x16_t mask,
+                           uint8x16_t* const op0, uint8x16_t* const oq0) {
+  const int8x16_t p1s = FlipSign_NEON(p1);
+  const int8x16_t p0s = FlipSign_NEON(p0);
+  const int8x16_t q0s = FlipSign_NEON(q0);
+  const int8x16_t q1s = FlipSign_NEON(q1);
+  const int8x16_t delta0 = GetBaseDelta_NEON(p1s, p0s, q0s, q1s);
   const int8x16_t delta1 = vandq_s8(delta0, vreinterpretq_s8_u8(mask));
-  ApplyFilter2(p0s, q0s, delta1, op0, oq0);
+  ApplyFilter2_NEON(p0s, q0s, delta1, op0, oq0);
 }
 
-static void SimpleVFilter16(uint8_t* p, int stride, int thresh) {
+static void SimpleVFilter16_NEON(uint8_t* p, int stride, int thresh) {
   uint8x16_t p1, p0, q0, q1, op0, oq0;
-  Load16x4(p, stride, &p1, &p0, &q0, &q1);
+  Load16x4_NEON(p, stride, &p1, &p0, &q0, &q1);
   {
-    const uint8x16_t mask = NeedsFilter(p1, p0, q0, q1, thresh);
-    DoFilter2(p1, p0, q0, q1, mask, &op0, &oq0);
+    const uint8x16_t mask = NeedsFilter_NEON(p1, p0, q0, q1, thresh);
+    DoFilter2_NEON(p1, p0, q0, q1, mask, &op0, &oq0);
   }
-  Store16x2(op0, oq0, p, stride);
+  Store16x2_NEON(op0, oq0, p, stride);
 }
 
-static void SimpleHFilter16(uint8_t* p, int stride, int thresh) {
+static void SimpleHFilter16_NEON(uint8_t* p, int stride, int thresh) {
   uint8x16_t p1, p0, q0, q1, oq0, op0;
-  Load4x16(p, stride, &p1, &p0, &q0, &q1);
+  Load4x16_NEON(p, stride, &p1, &p0, &q0, &q1);
   {
-    const uint8x16_t mask = NeedsFilter(p1, p0, q0, q1, thresh);
-    DoFilter2(p1, p0, q0, q1, mask, &op0, &oq0);
+    const uint8x16_t mask = NeedsFilter_NEON(p1, p0, q0, q1, thresh);
+    DoFilter2_NEON(p1, p0, q0, q1, mask, &op0, &oq0);
   }
-  Store2x16(op0, oq0, p, stride);
+  Store2x16_NEON(op0, oq0, p, stride);
 }
 
 #else
 
+// Load/Store vertical edge
+#define LOAD8x4(c1, c2, c3, c4, b1, b2, stride)                                \
+  "vld4.8 {" #c1 "[0]," #c2 "[0]," #c3 "[0]," #c4 "[0]}," #b1 "," #stride "\n" \
+  "vld4.8 {" #c1 "[1]," #c2 "[1]," #c3 "[1]," #c4 "[1]}," #b2 "," #stride "\n" \
+  "vld4.8 {" #c1 "[2]," #c2 "[2]," #c3 "[2]," #c4 "[2]}," #b1 "," #stride "\n" \
+  "vld4.8 {" #c1 "[3]," #c2 "[3]," #c3 "[3]," #c4 "[3]}," #b2 "," #stride "\n" \
+  "vld4.8 {" #c1 "[4]," #c2 "[4]," #c3 "[4]," #c4 "[4]}," #b1 "," #stride "\n" \
+  "vld4.8 {" #c1 "[5]," #c2 "[5]," #c3 "[5]," #c4 "[5]}," #b2 "," #stride "\n" \
+  "vld4.8 {" #c1 "[6]," #c2 "[6]," #c3 "[6]," #c4 "[6]}," #b1 "," #stride "\n" \
+  "vld4.8 {" #c1 "[7]," #c2 "[7]," #c3 "[7]," #c4 "[7]}," #b2 "," #stride "\n"
+
+#define STORE8x2(c1, c2, p, stride)                                            \
+  "vst2.8   {" #c1 "[0], " #c2 "[0]}," #p "," #stride " \n"                    \
+  "vst2.8   {" #c1 "[1], " #c2 "[1]}," #p "," #stride " \n"                    \
+  "vst2.8   {" #c1 "[2], " #c2 "[2]}," #p "," #stride " \n"                    \
+  "vst2.8   {" #c1 "[3], " #c2 "[3]}," #p "," #stride " \n"                    \
+  "vst2.8   {" #c1 "[4], " #c2 "[4]}," #p "," #stride " \n"                    \
+  "vst2.8   {" #c1 "[5], " #c2 "[5]}," #p "," #stride " \n"                    \
+  "vst2.8   {" #c1 "[6], " #c2 "[6]}," #p "," #stride " \n"                    \
+  "vst2.8   {" #c1 "[7], " #c2 "[7]}," #p "," #stride " \n"
+
 #define QRegs "q0", "q1", "q2", "q3",                                          \
               "q8", "q9", "q10", "q11", "q12", "q13", "q14", "q15"
 
@@ -592,7 +601,7 @@ static void SimpleHFilter16(uint8_t* p, int stride, int thresh) {
   DO_SIMPLE_FILTER(p0, q0, q9)                 /* apply filter */              \
   FLIP_SIGN_BIT2(p0, q0, q10)
 
-static void SimpleVFilter16(uint8_t* p, int stride, int thresh) {
+static void SimpleVFilter16_NEON(uint8_t* p, int stride, int thresh) {
   __asm__ volatile (
     "sub        %[p], %[p], %[stride], lsl #1  \n"  // p -= 2 * stride
 
@@ -613,7 +622,7 @@ static void SimpleVFilter16(uint8_t* p, int stride, int thresh) {
   );
 }
 
-static void SimpleHFilter16(uint8_t* p, int stride, int thresh) {
+static void SimpleHFilter16_NEON(uint8_t* p, int stride, int thresh) {
   __asm__ volatile (
     "sub        r4, %[p], #2                   \n"  // base1 = p - 2
     "lsl        r6, %[stride], #1              \n"  // r6 = 2 * stride
@@ -639,30 +648,33 @@ static void SimpleHFilter16(uint8_t* p, int stride, int thresh) {
   );
 }
 
+#undef LOAD8x4
+#undef STORE8x2
+
 #endif    // WEBP_USE_INTRINSICS
 
-static void SimpleVFilter16i(uint8_t* p, int stride, int thresh) {
+static void SimpleVFilter16i_NEON(uint8_t* p, int stride, int thresh) {
   uint32_t k;
   for (k = 3; k != 0; --k) {
     p += 4 * stride;
-    SimpleVFilter16(p, stride, thresh);
+    SimpleVFilter16_NEON(p, stride, thresh);
   }
 }
 
-static void SimpleHFilter16i(uint8_t* p, int stride, int thresh) {
+static void SimpleHFilter16i_NEON(uint8_t* p, int stride, int thresh) {
   uint32_t k;
   for (k = 3; k != 0; --k) {
     p += 4;
-    SimpleHFilter16(p, stride, thresh);
+    SimpleHFilter16_NEON(p, stride, thresh);
   }
 }
 
 //------------------------------------------------------------------------------
 // Complex In-loop filtering (Paragraph 15.3)
 
-static uint8x16_t NeedsHev(const uint8x16_t p1, const uint8x16_t p0,
-                           const uint8x16_t q0, const uint8x16_t q1,
-                           int hev_thresh) {
+static uint8x16_t NeedsHev_NEON(const uint8x16_t p1, const uint8x16_t p0,
+                                const uint8x16_t q0, const uint8x16_t q1,
+                                int hev_thresh) {
   const uint8x16_t hev_thresh_v = vdupq_n_u8((uint8_t)hev_thresh);
   const uint8x16_t a_p1_p0 = vabdq_u8(p1, p0);  // abs(p1 - p0)
   const uint8x16_t a_q1_q0 = vabdq_u8(q1, q0);  // abs(q1 - q0)
@@ -671,11 +683,11 @@ static uint8x16_t NeedsHev(const uint8x16_t p1, const uint8x16_t p0,
   return mask;
 }
 
-static uint8x16_t NeedsFilter2(const uint8x16_t p3, const uint8x16_t p2,
-                               const uint8x16_t p1, const uint8x16_t p0,
-                               const uint8x16_t q0, const uint8x16_t q1,
-                               const uint8x16_t q2, const uint8x16_t q3,
-                               int ithresh, int thresh) {
+static uint8x16_t NeedsFilter2_NEON(const uint8x16_t p3, const uint8x16_t p2,
+                                    const uint8x16_t p1, const uint8x16_t p0,
+                                    const uint8x16_t q0, const uint8x16_t q1,
+                                    const uint8x16_t q2, const uint8x16_t q3,
+                                    int ithresh, int thresh) {
   const uint8x16_t ithresh_v = vdupq_n_u8((uint8_t)ithresh);
   const uint8x16_t a_p3_p2 = vabdq_u8(p3, p2);  // abs(p3 - p2)
   const uint8x16_t a_p2_p1 = vabdq_u8(p2, p1);  // abs(p2 - p1)
@@ -689,14 +701,14 @@ static uint8x16_t NeedsFilter2(const uint8x16_t p3, const uint8x16_t p2,
   const uint8x16_t max12 = vmaxq_u8(max1, max2);
   const uint8x16_t max123 = vmaxq_u8(max12, max3);
   const uint8x16_t mask2 = vcgeq_u8(ithresh_v, max123);
-  const uint8x16_t mask1 = NeedsFilter(p1, p0, q0, q1, thresh);
+  const uint8x16_t mask1 = NeedsFilter_NEON(p1, p0, q0, q1, thresh);
   const uint8x16_t mask = vandq_u8(mask1, mask2);
   return mask;
 }
 
 //  4-points filter
 
-static void ApplyFilter4(
+static void ApplyFilter4_NEON(
     const int8x16_t p1, const int8x16_t p0,
     const int8x16_t q0, const int8x16_t q1,
     const int8x16_t delta0,
@@ -709,47 +721,47 @@ static void ApplyFilter4(
   const int8x16_t a1 = vshrq_n_s8(delta1, 3);
   const int8x16_t a2 = vshrq_n_s8(delta2, 3);
   const int8x16_t a3 = vrshrq_n_s8(a1, 1);   // a3 = (a1 + 1) >> 1
-  *op0 = FlipSignBack(vqaddq_s8(p0, a2));  // clip(p0 + a2)
-  *oq0 = FlipSignBack(vqsubq_s8(q0, a1));  // clip(q0 - a1)
-  *op1 = FlipSignBack(vqaddq_s8(p1, a3));  // clip(p1 + a3)
-  *oq1 = FlipSignBack(vqsubq_s8(q1, a3));  // clip(q1 - a3)
+  *op0 = FlipSignBack_NEON(vqaddq_s8(p0, a2));  // clip(p0 + a2)
+  *oq0 = FlipSignBack_NEON(vqsubq_s8(q0, a1));  // clip(q0 - a1)
+  *op1 = FlipSignBack_NEON(vqaddq_s8(p1, a3));  // clip(p1 + a3)
+  *oq1 = FlipSignBack_NEON(vqsubq_s8(q1, a3));  // clip(q1 - a3)
 }
 
-static void DoFilter4(
+static void DoFilter4_NEON(
     const uint8x16_t p1, const uint8x16_t p0,
     const uint8x16_t q0, const uint8x16_t q1,
     const uint8x16_t mask, const uint8x16_t hev_mask,
     uint8x16_t* const op1, uint8x16_t* const op0,
     uint8x16_t* const oq0, uint8x16_t* const oq1) {
   // This is a fused version of DoFilter2() calling ApplyFilter2 directly
-  const int8x16_t p1s = FlipSign(p1);
-  int8x16_t p0s = FlipSign(p0);
-  int8x16_t q0s = FlipSign(q0);
-  const int8x16_t q1s = FlipSign(q1);
+  const int8x16_t p1s = FlipSign_NEON(p1);
+  int8x16_t p0s = FlipSign_NEON(p0);
+  int8x16_t q0s = FlipSign_NEON(q0);
+  const int8x16_t q1s = FlipSign_NEON(q1);
   const uint8x16_t simple_lf_mask = vandq_u8(mask, hev_mask);
 
   // do_filter2 part (simple loopfilter on pixels with hev)
   {
-    const int8x16_t delta = GetBaseDelta(p1s, p0s, q0s, q1s);
+    const int8x16_t delta = GetBaseDelta_NEON(p1s, p0s, q0s, q1s);
     const int8x16_t simple_lf_delta =
         vandq_s8(delta, vreinterpretq_s8_u8(simple_lf_mask));
-    ApplyFilter2NoFlip(p0s, q0s, simple_lf_delta, &p0s, &q0s);
+    ApplyFilter2NoFlip_NEON(p0s, q0s, simple_lf_delta, &p0s, &q0s);
   }
 
   // do_filter4 part (complex loopfilter on pixels without hev)
   {
-    const int8x16_t delta0 = GetBaseDelta0(p0s, q0s);
+    const int8x16_t delta0 = GetBaseDelta0_NEON(p0s, q0s);
     // we use: (mask & hev_mask) ^ mask = mask & !hev_mask
     const uint8x16_t complex_lf_mask = veorq_u8(simple_lf_mask, mask);
     const int8x16_t complex_lf_delta =
         vandq_s8(delta0, vreinterpretq_s8_u8(complex_lf_mask));
-    ApplyFilter4(p1s, p0s, q0s, q1s, complex_lf_delta, op1, op0, oq0, oq1);
+    ApplyFilter4_NEON(p1s, p0s, q0s, q1s, complex_lf_delta, op1, op0, oq0, oq1);
   }
 }
 
 //  6-points filter
 
-static void ApplyFilter6(
+static void ApplyFilter6_NEON(
     const int8x16_t p2, const int8x16_t p1, const int8x16_t p0,
     const int8x16_t q0, const int8x16_t q1, const int8x16_t q2,
     const int8x16_t delta,
@@ -778,35 +790,35 @@ static void ApplyFilter6(
   const int8x16_t a2 = vcombine_s8(a2_lo, a2_hi);
   const int8x16_t a3 = vcombine_s8(a3_lo, a3_hi);
 
-  *op0 = FlipSignBack(vqaddq_s8(p0, a1));  // clip(p0 + a1)
-  *oq0 = FlipSignBack(vqsubq_s8(q0, a1));  // clip(q0 - q1)
-  *oq1 = FlipSignBack(vqsubq_s8(q1, a2));  // clip(q1 - a2)
-  *op1 = FlipSignBack(vqaddq_s8(p1, a2));  // clip(p1 + a2)
-  *oq2 = FlipSignBack(vqsubq_s8(q2, a3));  // clip(q2 - a3)
-  *op2 = FlipSignBack(vqaddq_s8(p2, a3));  // clip(p2 + a3)
+  *op0 = FlipSignBack_NEON(vqaddq_s8(p0, a1));  // clip(p0 + a1)
+  *oq0 = FlipSignBack_NEON(vqsubq_s8(q0, a1));  // clip(q0 - q1)
+  *oq1 = FlipSignBack_NEON(vqsubq_s8(q1, a2));  // clip(q1 - a2)
+  *op1 = FlipSignBack_NEON(vqaddq_s8(p1, a2));  // clip(p1 + a2)
+  *oq2 = FlipSignBack_NEON(vqsubq_s8(q2, a3));  // clip(q2 - a3)
+  *op2 = FlipSignBack_NEON(vqaddq_s8(p2, a3));  // clip(p2 + a3)
 }
 
-static void DoFilter6(
+static void DoFilter6_NEON(
     const uint8x16_t p2, const uint8x16_t p1, const uint8x16_t p0,
     const uint8x16_t q0, const uint8x16_t q1, const uint8x16_t q2,
     const uint8x16_t mask, const uint8x16_t hev_mask,
     uint8x16_t* const op2, uint8x16_t* const op1, uint8x16_t* const op0,
     uint8x16_t* const oq0, uint8x16_t* const oq1, uint8x16_t* const oq2) {
   // This is a fused version of DoFilter2() calling ApplyFilter2 directly
-  const int8x16_t p2s = FlipSign(p2);
-  const int8x16_t p1s = FlipSign(p1);
-  int8x16_t p0s = FlipSign(p0);
-  int8x16_t q0s = FlipSign(q0);
-  const int8x16_t q1s = FlipSign(q1);
-  const int8x16_t q2s = FlipSign(q2);
+  const int8x16_t p2s = FlipSign_NEON(p2);
+  const int8x16_t p1s = FlipSign_NEON(p1);
+  int8x16_t p0s = FlipSign_NEON(p0);
+  int8x16_t q0s = FlipSign_NEON(q0);
+  const int8x16_t q1s = FlipSign_NEON(q1);
+  const int8x16_t q2s = FlipSign_NEON(q2);
   const uint8x16_t simple_lf_mask = vandq_u8(mask, hev_mask);
-  const int8x16_t delta0 = GetBaseDelta(p1s, p0s, q0s, q1s);
+  const int8x16_t delta0 = GetBaseDelta_NEON(p1s, p0s, q0s, q1s);
 
   // do_filter2 part (simple loopfilter on pixels with hev)
   {
     const int8x16_t simple_lf_delta =
         vandq_s8(delta0, vreinterpretq_s8_u8(simple_lf_mask));
-    ApplyFilter2NoFlip(p0s, q0s, simple_lf_delta, &p0s, &q0s);
+    ApplyFilter2NoFlip_NEON(p0s, q0s, simple_lf_delta, &p0s, &q0s);
   }
 
   // do_filter6 part (complex loopfilter on pixels without hev)
@@ -815,65 +827,65 @@ static void DoFilter6(
     const uint8x16_t complex_lf_mask = veorq_u8(simple_lf_mask, mask);
     const int8x16_t complex_lf_delta =
         vandq_s8(delta0, vreinterpretq_s8_u8(complex_lf_mask));
-    ApplyFilter6(p2s, p1s, p0s, q0s, q1s, q2s, complex_lf_delta,
-                 op2, op1, op0, oq0, oq1, oq2);
+    ApplyFilter6_NEON(p2s, p1s, p0s, q0s, q1s, q2s, complex_lf_delta,
+                      op2, op1, op0, oq0, oq1, oq2);
   }
 }
 
 // on macroblock edges
 
-static void VFilter16(uint8_t* p, int stride,
-                      int thresh, int ithresh, int hev_thresh) {
+static void VFilter16_NEON(uint8_t* p, int stride,
+                           int thresh, int ithresh, int hev_thresh) {
   uint8x16_t p3, p2, p1, p0, q0, q1, q2, q3;
-  Load16x8(p, stride, &p3, &p2, &p1, &p0, &q0, &q1, &q2, &q3);
+  Load16x8_NEON(p, stride, &p3, &p2, &p1, &p0, &q0, &q1, &q2, &q3);
   {
-    const uint8x16_t mask = NeedsFilter2(p3, p2, p1, p0, q0, q1, q2, q3,
-                                         ithresh, thresh);
-    const uint8x16_t hev_mask = NeedsHev(p1, p0, q0, q1, hev_thresh);
+    const uint8x16_t mask = NeedsFilter2_NEON(p3, p2, p1, p0, q0, q1, q2, q3,
+                                              ithresh, thresh);
+    const uint8x16_t hev_mask = NeedsHev_NEON(p1, p0, q0, q1, hev_thresh);
     uint8x16_t op2, op1, op0, oq0, oq1, oq2;
-    DoFilter6(p2, p1, p0, q0, q1, q2, mask, hev_mask,
-              &op2, &op1, &op0, &oq0, &oq1, &oq2);
-    Store16x2(op2, op1, p - 2 * stride, stride);
-    Store16x2(op0, oq0, p + 0 * stride, stride);
-    Store16x2(oq1, oq2, p + 2 * stride, stride);
+    DoFilter6_NEON(p2, p1, p0, q0, q1, q2, mask, hev_mask,
+                   &op2, &op1, &op0, &oq0, &oq1, &oq2);
+    Store16x2_NEON(op2, op1, p - 2 * stride, stride);
+    Store16x2_NEON(op0, oq0, p + 0 * stride, stride);
+    Store16x2_NEON(oq1, oq2, p + 2 * stride, stride);
   }
 }
 
-static void HFilter16(uint8_t* p, int stride,
-                      int thresh, int ithresh, int hev_thresh) {
+static void HFilter16_NEON(uint8_t* p, int stride,
+                           int thresh, int ithresh, int hev_thresh) {
   uint8x16_t p3, p2, p1, p0, q0, q1, q2, q3;
-  Load8x16(p, stride, &p3, &p2, &p1, &p0, &q0, &q1, &q2, &q3);
+  Load8x16_NEON(p, stride, &p3, &p2, &p1, &p0, &q0, &q1, &q2, &q3);
   {
-    const uint8x16_t mask = NeedsFilter2(p3, p2, p1, p0, q0, q1, q2, q3,
-                                         ithresh, thresh);
-    const uint8x16_t hev_mask = NeedsHev(p1, p0, q0, q1, hev_thresh);
+    const uint8x16_t mask = NeedsFilter2_NEON(p3, p2, p1, p0, q0, q1, q2, q3,
+                                              ithresh, thresh);
+    const uint8x16_t hev_mask = NeedsHev_NEON(p1, p0, q0, q1, hev_thresh);
     uint8x16_t op2, op1, op0, oq0, oq1, oq2;
-    DoFilter6(p2, p1, p0, q0, q1, q2, mask, hev_mask,
-              &op2, &op1, &op0, &oq0, &oq1, &oq2);
-    Store2x16(op2, op1, p - 2, stride);
-    Store2x16(op0, oq0, p + 0, stride);
-    Store2x16(oq1, oq2, p + 2, stride);
+    DoFilter6_NEON(p2, p1, p0, q0, q1, q2, mask, hev_mask,
+                   &op2, &op1, &op0, &oq0, &oq1, &oq2);
+    Store2x16_NEON(op2, op1, p - 2, stride);
+    Store2x16_NEON(op0, oq0, p + 0, stride);
+    Store2x16_NEON(oq1, oq2, p + 2, stride);
   }
 }
 
 // on three inner edges
-static void VFilter16i(uint8_t* p, int stride,
-                       int thresh, int ithresh, int hev_thresh) {
+static void VFilter16i_NEON(uint8_t* p, int stride,
+                            int thresh, int ithresh, int hev_thresh) {
   uint32_t k;
   uint8x16_t p3, p2, p1, p0;
-  Load16x4(p + 2  * stride, stride, &p3, &p2, &p1, &p0);
+  Load16x4_NEON(p + 2  * stride, stride, &p3, &p2, &p1, &p0);
   for (k = 3; k != 0; --k) {
     uint8x16_t q0, q1, q2, q3;
     p += 4 * stride;
-    Load16x4(p + 2  * stride, stride, &q0, &q1, &q2, &q3);
+    Load16x4_NEON(p + 2  * stride, stride, &q0, &q1, &q2, &q3);
     {
       const uint8x16_t mask =
-          NeedsFilter2(p3, p2, p1, p0, q0, q1, q2, q3, ithresh, thresh);
-      const uint8x16_t hev_mask = NeedsHev(p1, p0, q0, q1, hev_thresh);
+          NeedsFilter2_NEON(p3, p2, p1, p0, q0, q1, q2, q3, ithresh, thresh);
+      const uint8x16_t hev_mask = NeedsHev_NEON(p1, p0, q0, q1, hev_thresh);
       // p3 and p2 are not just temporary variables here: they will be
       // re-used for next span. And q2/q3 will become p1/p0 accordingly.
-      DoFilter4(p1, p0, q0, q1, mask, hev_mask, &p1, &p0, &p3, &p2);
-      Store16x4(p1, p0, p3, p2, p, stride);
+      DoFilter4_NEON(p1, p0, q0, q1, mask, hev_mask, &p1, &p0, &p3, &p2);
+      Store16x4_NEON(p1, p0, p3, p2, p, stride);
       p1 = q2;
       p0 = q3;
     }
@@ -881,21 +893,21 @@ static void VFilter16i(uint8_t* p, int stride,
 }
 
 #if !defined(WORK_AROUND_GCC)
-static void HFilter16i(uint8_t* p, int stride,
-                       int thresh, int ithresh, int hev_thresh) {
+static void HFilter16i_NEON(uint8_t* p, int stride,
+                            int thresh, int ithresh, int hev_thresh) {
   uint32_t k;
   uint8x16_t p3, p2, p1, p0;
-  Load4x16(p + 2, stride, &p3, &p2, &p1, &p0);
+  Load4x16_NEON(p + 2, stride, &p3, &p2, &p1, &p0);
   for (k = 3; k != 0; --k) {
     uint8x16_t q0, q1, q2, q3;
     p += 4;
-    Load4x16(p + 2, stride, &q0, &q1, &q2, &q3);
+    Load4x16_NEON(p + 2, stride, &q0, &q1, &q2, &q3);
     {
       const uint8x16_t mask =
-          NeedsFilter2(p3, p2, p1, p0, q0, q1, q2, q3, ithresh, thresh);
-      const uint8x16_t hev_mask = NeedsHev(p1, p0, q0, q1, hev_thresh);
-      DoFilter4(p1, p0, q0, q1, mask, hev_mask, &p1, &p0, &p3, &p2);
-      Store4x16(p1, p0, p3, p2, p, stride);
+          NeedsFilter2_NEON(p3, p2, p1, p0, q0, q1, q2, q3, ithresh, thresh);
+      const uint8x16_t hev_mask = NeedsHev_NEON(p1, p0, q0, q1, hev_thresh);
+      DoFilter4_NEON(p1, p0, q0, q1, mask, hev_mask, &p1, &p0, &p3, &p2);
+      Store4x16_NEON(p1, p0, p3, p2, p, stride);
       p1 = q2;
       p0 = q3;
     }
@@ -904,67 +916,67 @@ static void HFilter16i(uint8_t* p, int stride,
 #endif  // !WORK_AROUND_GCC
 
 // 8-pixels wide variant, for chroma filtering
-static void VFilter8(uint8_t* u, uint8_t* v, int stride,
-                     int thresh, int ithresh, int hev_thresh) {
+static void VFilter8_NEON(uint8_t* u, uint8_t* v, int stride,
+                          int thresh, int ithresh, int hev_thresh) {
   uint8x16_t p3, p2, p1, p0, q0, q1, q2, q3;
-  Load8x8x2(u, v, stride, &p3, &p2, &p1, &p0, &q0, &q1, &q2, &q3);
+  Load8x8x2_NEON(u, v, stride, &p3, &p2, &p1, &p0, &q0, &q1, &q2, &q3);
   {
-    const uint8x16_t mask = NeedsFilter2(p3, p2, p1, p0, q0, q1, q2, q3,
-                                         ithresh, thresh);
-    const uint8x16_t hev_mask = NeedsHev(p1, p0, q0, q1, hev_thresh);
+    const uint8x16_t mask = NeedsFilter2_NEON(p3, p2, p1, p0, q0, q1, q2, q3,
+                                              ithresh, thresh);
+    const uint8x16_t hev_mask = NeedsHev_NEON(p1, p0, q0, q1, hev_thresh);
     uint8x16_t op2, op1, op0, oq0, oq1, oq2;
-    DoFilter6(p2, p1, p0, q0, q1, q2, mask, hev_mask,
-              &op2, &op1, &op0, &oq0, &oq1, &oq2);
-    Store8x2x2(op2, op1, u - 2 * stride, v - 2 * stride, stride);
-    Store8x2x2(op0, oq0, u + 0 * stride, v + 0 * stride, stride);
-    Store8x2x2(oq1, oq2, u + 2 * stride, v + 2 * stride, stride);
+    DoFilter6_NEON(p2, p1, p0, q0, q1, q2, mask, hev_mask,
+                   &op2, &op1, &op0, &oq0, &oq1, &oq2);
+    Store8x2x2_NEON(op2, op1, u - 2 * stride, v - 2 * stride, stride);
+    Store8x2x2_NEON(op0, oq0, u + 0 * stride, v + 0 * stride, stride);
+    Store8x2x2_NEON(oq1, oq2, u + 2 * stride, v + 2 * stride, stride);
   }
 }
-static void VFilter8i(uint8_t* u, uint8_t* v, int stride,
-                      int thresh, int ithresh, int hev_thresh) {
+static void VFilter8i_NEON(uint8_t* u, uint8_t* v, int stride,
+                           int thresh, int ithresh, int hev_thresh) {
   uint8x16_t p3, p2, p1, p0, q0, q1, q2, q3;
   u += 4 * stride;
   v += 4 * stride;
-  Load8x8x2(u, v, stride, &p3, &p2, &p1, &p0, &q0, &q1, &q2, &q3);
+  Load8x8x2_NEON(u, v, stride, &p3, &p2, &p1, &p0, &q0, &q1, &q2, &q3);
   {
-    const uint8x16_t mask = NeedsFilter2(p3, p2, p1, p0, q0, q1, q2, q3,
-                                         ithresh, thresh);
-    const uint8x16_t hev_mask = NeedsHev(p1, p0, q0, q1, hev_thresh);
+    const uint8x16_t mask = NeedsFilter2_NEON(p3, p2, p1, p0, q0, q1, q2, q3,
+                                              ithresh, thresh);
+    const uint8x16_t hev_mask = NeedsHev_NEON(p1, p0, q0, q1, hev_thresh);
     uint8x16_t op1, op0, oq0, oq1;
-    DoFilter4(p1, p0, q0, q1, mask, hev_mask, &op1, &op0, &oq0, &oq1);
-    Store8x4x2(op1, op0, oq0, oq1, u, v, stride);
+    DoFilter4_NEON(p1, p0, q0, q1, mask, hev_mask, &op1, &op0, &oq0, &oq1);
+    Store8x4x2_NEON(op1, op0, oq0, oq1, u, v, stride);
   }
 }
 
 #if !defined(WORK_AROUND_GCC)
-static void HFilter8(uint8_t* u, uint8_t* v, int stride,
-                     int thresh, int ithresh, int hev_thresh) {
+static void HFilter8_NEON(uint8_t* u, uint8_t* v, int stride,
+                          int thresh, int ithresh, int hev_thresh) {
   uint8x16_t p3, p2, p1, p0, q0, q1, q2, q3;
-  Load8x8x2T(u, v, stride, &p3, &p2, &p1, &p0, &q0, &q1, &q2, &q3);
+  Load8x8x2T_NEON(u, v, stride, &p3, &p2, &p1, &p0, &q0, &q1, &q2, &q3);
   {
-    const uint8x16_t mask = NeedsFilter2(p3, p2, p1, p0, q0, q1, q2, q3,
-                                         ithresh, thresh);
-    const uint8x16_t hev_mask = NeedsHev(p1, p0, q0, q1, hev_thresh);
+    const uint8x16_t mask = NeedsFilter2_NEON(p3, p2, p1, p0, q0, q1, q2, q3,
+                                              ithresh, thresh);
+    const uint8x16_t hev_mask = NeedsHev_NEON(p1, p0, q0, q1, hev_thresh);
     uint8x16_t op2, op1, op0, oq0, oq1, oq2;
-    DoFilter6(p2, p1, p0, q0, q1, q2, mask, hev_mask,
-              &op2, &op1, &op0, &oq0, &oq1, &oq2);
-    Store6x8x2(op2, op1, op0, oq0, oq1, oq2, u, v, stride);
+    DoFilter6_NEON(p2, p1, p0, q0, q1, q2, mask, hev_mask,
+                   &op2, &op1, &op0, &oq0, &oq1, &oq2);
+    Store6x8x2_NEON(op2, op1, op0, oq0, oq1, oq2, u, v, stride);
   }
 }
 
-static void HFilter8i(uint8_t* u, uint8_t* v, int stride,
-                      int thresh, int ithresh, int hev_thresh) {
+static void HFilter8i_NEON(uint8_t* u, uint8_t* v, int stride,
+                           int thresh, int ithresh, int hev_thresh) {
   uint8x16_t p3, p2, p1, p0, q0, q1, q2, q3;
   u += 4;
   v += 4;
-  Load8x8x2T(u, v, stride, &p3, &p2, &p1, &p0, &q0, &q1, &q2, &q3);
+  Load8x8x2T_NEON(u, v, stride, &p3, &p2, &p1, &p0, &q0, &q1, &q2, &q3);
   {
-    const uint8x16_t mask = NeedsFilter2(p3, p2, p1, p0, q0, q1, q2, q3,
-                                         ithresh, thresh);
-    const uint8x16_t hev_mask = NeedsHev(p1, p0, q0, q1, hev_thresh);
+    const uint8x16_t mask = NeedsFilter2_NEON(p3, p2, p1, p0, q0, q1, q2, q3,
+                                              ithresh, thresh);
+    const uint8x16_t hev_mask = NeedsHev_NEON(p1, p0, q0, q1, hev_thresh);
     uint8x16_t op1, op0, oq0, oq1;
-    DoFilter4(p1, p0, q0, q1, mask, hev_mask, &op1, &op0, &oq0, &oq1);
-    Store4x8x2(op1, op0, oq0, oq1, u, v, stride);
+    DoFilter4_NEON(p1, p0, q0, q1, mask, hev_mask, &op1, &op0, &oq0, &oq1);
+    Store4x8x2_NEON(op1, op0, oq0, oq1, u, v, stride);
   }
 }
 #endif  // !WORK_AROUND_GCC
@@ -992,8 +1004,9 @@ static const int16_t kC1 = 20091;
 static const int16_t kC2 = 17734;  // half of kC2, actually. See comment above.
 
 #if defined(WEBP_USE_INTRINSICS)
-static WEBP_INLINE void Transpose8x2(const int16x8_t in0, const int16x8_t in1,
-                                     int16x8x2_t* const out) {
+static WEBP_INLINE void Transpose8x2_NEON(const int16x8_t in0,
+                                          const int16x8_t in1,
+                                          int16x8x2_t* const out) {
   // a0 a1 a2 a3 | b0 b1 b2 b3   => a0 b0 c0 d0 | a1 b1 c1 d1
   // c0 c1 c2 c3 | d0 d1 d2 d3      a2 b2 c2 d2 | a3 b3 c3 d3
   const int16x8x2_t tmp0 = vzipq_s16(in0, in1);   // a0 c0 a1 c1 a2 c2 ...
@@ -1001,7 +1014,7 @@ static WEBP_INLINE void Transpose8x2(const int16x8_t in0, const int16x8_t in1,
   *out = vzipq_s16(tmp0.val[0], tmp0.val[1]);
 }
 
-static WEBP_INLINE void TransformPass(int16x8x2_t* const rows) {
+static WEBP_INLINE void TransformPass_NEON(int16x8x2_t* const rows) {
   // {rows} = in0 | in4
   //          in8 | in12
   // B1 = in4 | in12
@@ -1024,20 +1037,20 @@ static WEBP_INLINE void TransformPass(int16x8x2_t* const rows) {
   const int16x8_t E0 = vqaddq_s16(D0, D1);      // a+d | b+c
   const int16x8_t E_tmp = vqsubq_s16(D0, D1);   // a-d | b-c
   const int16x8_t E1 = vcombine_s16(vget_high_s16(E_tmp), vget_low_s16(E_tmp));
-  Transpose8x2(E0, E1, rows);
+  Transpose8x2_NEON(E0, E1, rows);
 }
 
-static void TransformOne(const int16_t* in, uint8_t* dst) {
+static void TransformOne_NEON(const int16_t* in, uint8_t* dst) {
   int16x8x2_t rows;
   INIT_VECTOR2(rows, vld1q_s16(in + 0), vld1q_s16(in + 8));
-  TransformPass(&rows);
-  TransformPass(&rows);
-  Add4x4(rows.val[0], rows.val[1], dst);
+  TransformPass_NEON(&rows);
+  TransformPass_NEON(&rows);
+  Add4x4_NEON(rows.val[0], rows.val[1], dst);
 }
 
 #else
 
-static void TransformOne(const int16_t* in, uint8_t* dst) {
+static void TransformOne_NEON(const int16_t* in, uint8_t* dst) {
   const int kBPS = BPS;
   // kC1, kC2. Padded because vld1.16 loads 8 bytes
   const int16_t constants[4] = { kC1, kC2, 0, 0 };
@@ -1170,16 +1183,16 @@ static void TransformOne(const int16_t* in, uint8_t* dst) {
 
 #endif    // WEBP_USE_INTRINSICS
 
-static void TransformTwo(const int16_t* in, uint8_t* dst, int do_two) {
-  TransformOne(in, dst);
+static void TransformTwo_NEON(const int16_t* in, uint8_t* dst, int do_two) {
+  TransformOne_NEON(in, dst);
   if (do_two) {
-    TransformOne(in + 16, dst + 4);
+    TransformOne_NEON(in + 16, dst + 4);
   }
 }
 
-static void TransformDC(const int16_t* in, uint8_t* dst) {
+static void TransformDC_NEON(const int16_t* in, uint8_t* dst) {
   const int16x8_t DC = vdupq_n_s16(in[0]);
-  Add4x4(DC, DC, dst);
+  Add4x4_NEON(DC, DC, dst);
 }
 
 //------------------------------------------------------------------------------
@@ -1191,7 +1204,7 @@ static void TransformDC(const int16_t* in, uint8_t* dst) {
   *dst = vgetq_lane_s32(rows.val[3], col); (dst) += 16; \
 } while (0)
 
-static void TransformWHT(const int16_t* in, int16_t* out) {
+static void TransformWHT_NEON(const int16_t* in, int16_t* out) {
   int32x4x4_t tmp;
 
   {
@@ -1209,7 +1222,7 @@ static void TransformWHT(const int16_t* in, int16_t* out) {
     tmp.val[2] = vsubq_s32(a0, a1);
     tmp.val[3] = vsubq_s32(a3, a2);
     // Arrange the temporary results column-wise.
-    tmp = Transpose4x4(tmp);
+    tmp = Transpose4x4_NEON(tmp);
   }
 
   {
@@ -1243,7 +1256,7 @@ static void TransformWHT(const int16_t* in, int16_t* out) {
 //------------------------------------------------------------------------------
 
 #define MUL(a, b) (((a) * (b)) >> 16)
-static void TransformAC3(const int16_t* in, uint8_t* dst) {
+static void TransformAC3_NEON(const int16_t* in, uint8_t* dst) {
   static const int kC1_full = 20091 + (1 << 16);
   static const int kC2_full = 35468;
   const int16x4_t A = vld1_dup_s16(in);
@@ -1259,14 +1272,14 @@ static void TransformAC3(const int16_t* in, uint8_t* dst) {
   const int16x4_t B = vqadd_s16(A, CD);
   const int16x8_t m0_m1 = vcombine_s16(vqadd_s16(B, d4), vqadd_s16(B, c4));
   const int16x8_t m2_m3 = vcombine_s16(vqsub_s16(B, c4), vqsub_s16(B, d4));
-  Add4x4(m0_m1, m2_m3, dst);
+  Add4x4_NEON(m0_m1, m2_m3, dst);
 }
 #undef MUL
 
 //------------------------------------------------------------------------------
 // 4x4
 
-static void DC4(uint8_t* dst) {    // DC
+static void DC4_NEON(uint8_t* dst) {    // DC
   const uint8x8_t A = vld1_u8(dst - BPS);  // top row
   const uint16x4_t p0 = vpaddl_u8(A);  // cascading summation of the top
   const uint16x4_t p1 = vpadd_u16(p0, p0);
@@ -1287,17 +1300,17 @@ static void DC4(uint8_t* dst) {    // DC
 }
 
 // TrueMotion (4x4 + 8x8)
-static WEBP_INLINE void TrueMotion(uint8_t* dst, int size) {
+static WEBP_INLINE void TrueMotion_NEON(uint8_t* dst, int size) {
   const uint8x8_t TL = vld1_dup_u8(dst - BPS - 1);  // top-left pixel 'A[-1]'
   const uint8x8_t T = vld1_u8(dst - BPS);  // top row 'A[0..3]'
   const int16x8_t d = vreinterpretq_s16_u16(vsubl_u8(T, TL));  // A[c] - A[-1]
   int y;
   for (y = 0; y < size; y += 4) {
     // left edge
-    const int16x8_t L0 = ConvertU8ToS16(vld1_dup_u8(dst + 0 * BPS - 1));
-    const int16x8_t L1 = ConvertU8ToS16(vld1_dup_u8(dst + 1 * BPS - 1));
-    const int16x8_t L2 = ConvertU8ToS16(vld1_dup_u8(dst + 2 * BPS - 1));
-    const int16x8_t L3 = ConvertU8ToS16(vld1_dup_u8(dst + 3 * BPS - 1));
+    const int16x8_t L0 = ConvertU8ToS16_NEON(vld1_dup_u8(dst + 0 * BPS - 1));
+    const int16x8_t L1 = ConvertU8ToS16_NEON(vld1_dup_u8(dst + 1 * BPS - 1));
+    const int16x8_t L2 = ConvertU8ToS16_NEON(vld1_dup_u8(dst + 2 * BPS - 1));
+    const int16x8_t L3 = ConvertU8ToS16_NEON(vld1_dup_u8(dst + 3 * BPS - 1));
     const int16x8_t r0 = vaddq_s16(L0, d);  // L[r] + A[c] - A[-1]
     const int16x8_t r1 = vaddq_s16(L1, d);
     const int16x8_t r2 = vaddq_s16(L2, d);
@@ -1322,9 +1335,9 @@ static WEBP_INLINE void TrueMotion(uint8_t* dst, int size) {
   }
 }
 
-static void TM4(uint8_t* dst) { TrueMotion(dst, 4); }
+static void TM4_NEON(uint8_t* dst) { TrueMotion_NEON(dst, 4); }
 
-static void VE4(uint8_t* dst) {    // vertical
+static void VE4_NEON(uint8_t* dst) {    // vertical
   // NB: avoid vld1_u64 here as an alignment hint may be added -> SIGBUS.
   const uint64x1_t A0 = vreinterpret_u64_u8(vld1_u8(dst - BPS - 1));  // top row
   const uint64x1_t A1 = vshr_n_u64(A0, 8);
@@ -1340,7 +1353,7 @@ static void VE4(uint8_t* dst) {    // vertical
   }
 }
 
-static void RD4(uint8_t* dst) {   // Down-right
+static void RD4_NEON(uint8_t* dst) {   // Down-right
   const uint8x8_t XABCD_u8 = vld1_u8(dst - BPS - 1);
   const uint64x1_t XABCD = vreinterpret_u64_u8(XABCD_u8);
   const uint64x1_t ____XABC = vshl_n_u64(XABCD, 32);
@@ -1368,7 +1381,7 @@ static void RD4(uint8_t* dst) {   // Down-right
   vst1_lane_u32((uint32_t*)(dst + 3 * BPS), r3, 0);
 }
 
-static void LD4(uint8_t* dst) {    // Down-left
+static void LD4_NEON(uint8_t* dst) {    // Down-left
   // Note using the same shift trick as VE4() is slower here.
   const uint8x8_t ABCDEFGH = vld1_u8(dst - BPS + 0);
   const uint8x8_t BCDEFGH0 = vld1_u8(dst - BPS + 1);
@@ -1390,7 +1403,7 @@ static void LD4(uint8_t* dst) {    // Down-left
 //------------------------------------------------------------------------------
 // Chroma
 
-static void VE8uv(uint8_t* dst) {    // vertical
+static void VE8uv_NEON(uint8_t* dst) {    // vertical
   const uint8x8_t top = vld1_u8(dst - BPS);
   int j;
   for (j = 0; j < 8; ++j) {
@@ -1398,7 +1411,7 @@ static void VE8uv(uint8_t* dst) {    // vertical
   }
 }
 
-static void HE8uv(uint8_t* dst) {    // horizontal
+static void HE8uv_NEON(uint8_t* dst) {    // horizontal
   int j;
   for (j = 0; j < 8; ++j) {
     const uint8x8_t left = vld1_dup_u8(dst - 1);
@@ -1407,7 +1420,7 @@ static void HE8uv(uint8_t* dst) {    // horizontal
   }
 }
 
-static WEBP_INLINE void DC8(uint8_t* dst, int do_top, int do_left) {
+static WEBP_INLINE void DC8_NEON(uint8_t* dst, int do_top, int do_left) {
   uint16x8_t sum_top;
   uint16x8_t sum_left;
   uint8x8_t dc0;
@@ -1458,17 +1471,17 @@ static WEBP_INLINE void DC8(uint8_t* dst, int do_top, int do_left) {
   }
 }
 
-static void DC8uv(uint8_t* dst) { DC8(dst, 1, 1); }
-static void DC8uvNoTop(uint8_t* dst) { DC8(dst, 0, 1); }
-static void DC8uvNoLeft(uint8_t* dst) { DC8(dst, 1, 0); }
-static void DC8uvNoTopLeft(uint8_t* dst) { DC8(dst, 0, 0); }
+static void DC8uv_NEON(uint8_t* dst) { DC8_NEON(dst, 1, 1); }
+static void DC8uvNoTop_NEON(uint8_t* dst) { DC8_NEON(dst, 0, 1); }
+static void DC8uvNoLeft_NEON(uint8_t* dst) { DC8_NEON(dst, 1, 0); }
+static void DC8uvNoTopLeft_NEON(uint8_t* dst) { DC8_NEON(dst, 0, 0); }
 
-static void TM8uv(uint8_t* dst) { TrueMotion(dst, 8); }
+static void TM8uv_NEON(uint8_t* dst) { TrueMotion_NEON(dst, 8); }
 
 //------------------------------------------------------------------------------
 // 16x16
 
-static void VE16(uint8_t* dst) {     // vertical
+static void VE16_NEON(uint8_t* dst) {     // vertical
   const uint8x16_t top = vld1q_u8(dst - BPS);
   int j;
   for (j = 0; j < 16; ++j) {
@@ -1476,7 +1489,7 @@ static void VE16(uint8_t* dst) {     // vertical
   }
 }
 
-static void HE16(uint8_t* dst) {     // horizontal
+static void HE16_NEON(uint8_t* dst) {     // horizontal
   int j;
   for (j = 0; j < 16; ++j) {
     const uint8x16_t left = vld1q_dup_u8(dst - 1);
@@ -1485,7 +1498,7 @@ static void HE16(uint8_t* dst) {     // horizontal
   }
 }
 
-static WEBP_INLINE void DC16(uint8_t* dst, int do_top, int do_left) {
+static WEBP_INLINE void DC16_NEON(uint8_t* dst, int do_top, int do_left) {
   uint16x8_t sum_top;
   uint16x8_t sum_left;
   uint8x8_t dc0;
@@ -1542,12 +1555,12 @@ static WEBP_INLINE void DC16(uint8_t* dst, int do_top, int do_left) {
   }
 }
 
-static void DC16TopLeft(uint8_t* dst) { DC16(dst, 1, 1); }
-static void DC16NoTop(uint8_t* dst) { DC16(dst, 0, 1); }
-static void DC16NoLeft(uint8_t* dst) { DC16(dst, 1, 0); }
-static void DC16NoTopLeft(uint8_t* dst) { DC16(dst, 0, 0); }
+static void DC16TopLeft_NEON(uint8_t* dst) { DC16_NEON(dst, 1, 1); }
+static void DC16NoTop_NEON(uint8_t* dst) { DC16_NEON(dst, 0, 1); }
+static void DC16NoLeft_NEON(uint8_t* dst) { DC16_NEON(dst, 1, 0); }
+static void DC16NoTopLeft_NEON(uint8_t* dst) { DC16_NEON(dst, 0, 0); }
 
-static void TM16(uint8_t* dst) {
+static void TM16_NEON(uint8_t* dst) {
   const uint8x8_t TL = vld1_dup_u8(dst - BPS - 1);  // top-left pixel 'A[-1]'
   const uint8x16_t T = vld1q_u8(dst - BPS);  // top row 'A[0..15]'
   // A[c] - A[-1]
@@ -1556,10 +1569,10 @@ static void TM16(uint8_t* dst) {
   int y;
   for (y = 0; y < 16; y += 4) {
     // left edge
-    const int16x8_t L0 = ConvertU8ToS16(vld1_dup_u8(dst + 0 * BPS - 1));
-    const int16x8_t L1 = ConvertU8ToS16(vld1_dup_u8(dst + 1 * BPS - 1));
-    const int16x8_t L2 = ConvertU8ToS16(vld1_dup_u8(dst + 2 * BPS - 1));
-    const int16x8_t L3 = ConvertU8ToS16(vld1_dup_u8(dst + 3 * BPS - 1));
+    const int16x8_t L0 = ConvertU8ToS16_NEON(vld1_dup_u8(dst + 0 * BPS - 1));
+    const int16x8_t L1 = ConvertU8ToS16_NEON(vld1_dup_u8(dst + 1 * BPS - 1));
+    const int16x8_t L2 = ConvertU8ToS16_NEON(vld1_dup_u8(dst + 2 * BPS - 1));
+    const int16x8_t L3 = ConvertU8ToS16_NEON(vld1_dup_u8(dst + 3 * BPS - 1));
     const int16x8_t r0_lo = vaddq_s16(L0, d_lo);  // L[r] + A[c] - A[-1]
     const int16x8_t r1_lo = vaddq_s16(L1, d_lo);
     const int16x8_t r2_lo = vaddq_s16(L2, d_lo);
@@ -1587,49 +1600,49 @@ static void TM16(uint8_t* dst) {
 extern void VP8DspInitNEON(void);
 
 WEBP_TSAN_IGNORE_FUNCTION void VP8DspInitNEON(void) {
-  VP8Transform = TransformTwo;
-  VP8TransformAC3 = TransformAC3;
-  VP8TransformDC = TransformDC;
-  VP8TransformWHT = TransformWHT;
-
-  VP8VFilter16 = VFilter16;
-  VP8VFilter16i = VFilter16i;
-  VP8HFilter16 = HFilter16;
+  VP8Transform = TransformTwo_NEON;
+  VP8TransformAC3 = TransformAC3_NEON;
+  VP8TransformDC = TransformDC_NEON;
+  VP8TransformWHT = TransformWHT_NEON;
+
+  VP8VFilter16 = VFilter16_NEON;
+  VP8VFilter16i = VFilter16i_NEON;
+  VP8HFilter16 = HFilter16_NEON;
 #if !defined(WORK_AROUND_GCC)
-  VP8HFilter16i = HFilter16i;
+  VP8HFilter16i = HFilter16i_NEON;
 #endif
-  VP8VFilter8 = VFilter8;
-  VP8VFilter8i = VFilter8i;
+  VP8VFilter8 = VFilter8_NEON;
+  VP8VFilter8i = VFilter8i_NEON;
 #if !defined(WORK_AROUND_GCC)
-  VP8HFilter8 = HFilter8;
-  VP8HFilter8i = HFilter8i;
+  VP8HFilter8 = HFilter8_NEON;
+  VP8HFilter8i = HFilter8i_NEON;
 #endif
-  VP8SimpleVFilter16 = SimpleVFilter16;
-  VP8SimpleHFilter16 = SimpleHFilter16;
-  VP8SimpleVFilter16i = SimpleVFilter16i;
-  VP8SimpleHFilter16i = SimpleHFilter16i;
-
-  VP8PredLuma4[0] = DC4;
-  VP8PredLuma4[1] = TM4;
-  VP8PredLuma4[2] = VE4;
-  VP8PredLuma4[4] = RD4;
-  VP8PredLuma4[6] = LD4;
-
-  VP8PredLuma16[0] = DC16TopLeft;
-  VP8PredLuma16[1] = TM16;
-  VP8PredLuma16[2] = VE16;
-  VP8PredLuma16[3] = HE16;
-  VP8PredLuma16[4] = DC16NoTop;
-  VP8PredLuma16[5] = DC16NoLeft;
-  VP8PredLuma16[6] = DC16NoTopLeft;
-
-  VP8PredChroma8[0] = DC8uv;
-  VP8PredChroma8[1] = TM8uv;
-  VP8PredChroma8[2] = VE8uv;
-  VP8PredChroma8[3] = HE8uv;
-  VP8PredChroma8[4] = DC8uvNoTop;
-  VP8PredChroma8[5] = DC8uvNoLeft;
-  VP8PredChroma8[6] = DC8uvNoTopLeft;
+  VP8SimpleVFilter16 = SimpleVFilter16_NEON;
+  VP8SimpleHFilter16 = SimpleHFilter16_NEON;
+  VP8SimpleVFilter16i = SimpleVFilter16i_NEON;
+  VP8SimpleHFilter16i = SimpleHFilter16i_NEON;
+
+  VP8PredLuma4[0] = DC4_NEON;
+  VP8PredLuma4[1] = TM4_NEON;
+  VP8PredLuma4[2] = VE4_NEON;
+  VP8PredLuma4[4] = RD4_NEON;
+  VP8PredLuma4[6] = LD4_NEON;
+
+  VP8PredLuma16[0] = DC16TopLeft_NEON;
+  VP8PredLuma16[1] = TM16_NEON;
+  VP8PredLuma16[2] = VE16_NEON;
+  VP8PredLuma16[3] = HE16_NEON;
+  VP8PredLuma16[4] = DC16NoTop_NEON;
+  VP8PredLuma16[5] = DC16NoLeft_NEON;
+  VP8PredLuma16[6] = DC16NoTopLeft_NEON;
+
+  VP8PredChroma8[0] = DC8uv_NEON;
+  VP8PredChroma8[1] = TM8uv_NEON;
+  VP8PredChroma8[2] = VE8uv_NEON;
+  VP8PredChroma8[3] = HE8uv_NEON;
+  VP8PredChroma8[4] = DC8uvNoTop_NEON;
+  VP8PredChroma8[5] = DC8uvNoLeft_NEON;
+  VP8PredChroma8[6] = DC8uvNoTopLeft_NEON;
 }
 
 #else  // !WEBP_USE_NEON
diff --git a/media/libwebp/dsp/dec_sse2.c b/media/libwebp/dsp/dec_sse2.c
index 411fb02768..f187a5bb48 100644
--- a/media/libwebp/dsp/dec_sse2.c
+++ b/media/libwebp/dsp/dec_sse2.c
@@ -12,23 +12,25 @@
 // Author: somnath@google.com (Somnath Banerjee)
 //         cduvivier@google.com (Christian Duvivier)
 
-#include "./dsp.h"
+#include "../dsp/dsp.h"
 
 #if defined(WEBP_USE_SSE2)
 
 // The 3-coeff sparse transform in SSE2 is not really faster than the plain-C
 // one it seems => disable it by default. Uncomment the following to enable:
-// #define USE_TRANSFORM_AC3
+#if !defined(USE_TRANSFORM_AC3)
+#define USE_TRANSFORM_AC3 0   // ALTERNATE_CODE
+#endif
 
 #include <emmintrin.h>
-#include "./common_sse2.h"
+#include "../dsp/common_sse2.h"
 #include "../dec/vp8i_dec.h"
 #include "../utils/utils.h"
 
 //------------------------------------------------------------------------------
 // Transforms (Paragraph 14.4)
 
-static void Transform(const int16_t* in, uint8_t* dst, int do_two) {
+static void Transform_SSE2(const int16_t* in, uint8_t* dst, int do_two) {
   // This implementation makes use of 16-bit fixed point versions of two
   // multiply constants:
   //    K1 = sqrt(2) * cos (pi/8) ~= 85627 / 2^16
@@ -193,7 +195,7 @@ static void Transform(const int16_t* in, uint8_t* dst, int do_two) {
   }
 }
 
-#if defined(USE_TRANSFORM_AC3)
+#if (USE_TRANSFORM_AC3 == 1)
 #define MUL(a, b) (((a) * (b)) >> 16)
 static void TransformAC3(const int16_t* in, uint8_t* dst) {
   static const int kC1 = 20091 + (1 << 16);
@@ -248,7 +250,7 @@ static void TransformAC3(const int16_t* in, uint8_t* dst) {
     _mm_subs_epu8((p), (q)))
 
 // Shift each byte of "x" by 3 bits while preserving by the sign bit.
-static WEBP_INLINE void SignedShift8b(__m128i* const x) {
+static WEBP_INLINE void SignedShift8b_SSE2(__m128i* const x) {
   const __m128i zero = _mm_setzero_si128();
   const __m128i lo_0 = _mm_unpacklo_epi8(zero, *x);
   const __m128i hi_0 = _mm_unpackhi_epi8(zero, *x);
@@ -258,8 +260,8 @@ static WEBP_INLINE void SignedShift8b(__m128i* const x) {
 }
 
 #define FLIP_SIGN_BIT2(a, b) {                                                 \
-  a = _mm_xor_si128(a, sign_bit);                                              \
-  b = _mm_xor_si128(b, sign_bit);                                              \
+  (a) = _mm_xor_si128(a, sign_bit);                                            \
+  (b) = _mm_xor_si128(b, sign_bit);                                            \
 }
 
 #define FLIP_SIGN_BIT4(a, b, c, d) {                                           \
@@ -268,11 +270,11 @@ static WEBP_INLINE void SignedShift8b(__m128i* const x) {
 }
 
 // input/output is uint8_t
-static WEBP_INLINE void GetNotHEV(const __m128i* const p1,
-                                  const __m128i* const p0,
-                                  const __m128i* const q0,
-                                  const __m128i* const q1,
-                                  int hev_thresh, __m128i* const not_hev) {
+static WEBP_INLINE void GetNotHEV_SSE2(const __m128i* const p1,
+                                       const __m128i* const p0,
+                                       const __m128i* const q0,
+                                       const __m128i* const q1,
+                                       int hev_thresh, __m128i* const not_hev) {
   const __m128i zero = _mm_setzero_si128();
   const __m128i t_1 = MM_ABS(*p1, *p0);
   const __m128i t_2 = MM_ABS(*q1, *q0);
@@ -285,11 +287,11 @@ static WEBP_INLINE void GetNotHEV(const __m128i* const p1,
 }
 
 // input pixels are int8_t
-static WEBP_INLINE void GetBaseDelta(const __m128i* const p1,
-                                     const __m128i* const p0,
-                                     const __m128i* const q0,
-                                     const __m128i* const q1,
-                                     __m128i* const delta) {
+static WEBP_INLINE void GetBaseDelta_SSE2(const __m128i* const p1,
+                                          const __m128i* const p0,
+                                          const __m128i* const q0,
+                                          const __m128i* const q1,
+                                          __m128i* const delta) {
   // beware of addition order, for saturation!
   const __m128i p1_q1 = _mm_subs_epi8(*p1, *q1);   // p1 - q1
   const __m128i q0_p0 = _mm_subs_epi8(*q0, *p0);   // q0 - p0
@@ -300,15 +302,16 @@ static WEBP_INLINE void GetBaseDelta(const __m128i* const p1,
 }
 
 // input and output are int8_t
-static WEBP_INLINE void DoSimpleFilter(__m128i* const p0, __m128i* const q0,
-                                       const __m128i* const fl) {
+static WEBP_INLINE void DoSimpleFilter_SSE2(__m128i* const p0,
+                                            __m128i* const q0,
+                                            const __m128i* const fl) {
   const __m128i k3 = _mm_set1_epi8(3);
   const __m128i k4 = _mm_set1_epi8(4);
   __m128i v3 = _mm_adds_epi8(*fl, k3);
   __m128i v4 = _mm_adds_epi8(*fl, k4);
 
-  SignedShift8b(&v4);                  // v4 >> 3
-  SignedShift8b(&v3);                  // v3 >> 3
+  SignedShift8b_SSE2(&v4);             // v4 >> 3
+  SignedShift8b_SSE2(&v3);             // v3 >> 3
   *q0 = _mm_subs_epi8(*q0, v4);        // q0 -= v4
   *p0 = _mm_adds_epi8(*p0, v3);        // p0 += v3
 }
@@ -317,9 +320,9 @@ static WEBP_INLINE void DoSimpleFilter(__m128i* const p0, __m128i* const q0,
 // Update operations:
 // q = q - delta and p = p + delta; where delta = [(a_hi >> 7), (a_lo >> 7)]
 // Pixels 'pi' and 'qi' are int8_t on input, uint8_t on output (sign flip).
-static WEBP_INLINE void Update2Pixels(__m128i* const pi, __m128i* const qi,
-                                      const __m128i* const a0_lo,
-                                      const __m128i* const a0_hi) {
+static WEBP_INLINE void Update2Pixels_SSE2(__m128i* const pi, __m128i* const qi,
+                                           const __m128i* const a0_lo,
+                                           const __m128i* const a0_hi) {
   const __m128i a1_lo = _mm_srai_epi16(*a0_lo, 7);
   const __m128i a1_hi = _mm_srai_epi16(*a0_hi, 7);
   const __m128i delta = _mm_packs_epi16(a1_lo, a1_hi);
@@ -330,11 +333,11 @@ static WEBP_INLINE void Update2Pixels(__m128i* const pi, __m128i* const qi,
 }
 
 // input pixels are uint8_t
-static WEBP_INLINE void NeedsFilter(const __m128i* const p1,
-                                    const __m128i* const p0,
-                                    const __m128i* const q0,
-                                    const __m128i* const q1,
-                                    int thresh, __m128i* const mask) {
+static WEBP_INLINE void NeedsFilter_SSE2(const __m128i* const p1,
+                                         const __m128i* const p0,
+                                         const __m128i* const q0,
+                                         const __m128i* const q1,
+                                         int thresh, __m128i* const mask) {
   const __m128i m_thresh = _mm_set1_epi8(thresh);
   const __m128i t1 = MM_ABS(*p1, *q1);        // abs(p1 - q1)
   const __m128i kFE = _mm_set1_epi8(0xFE);
@@ -353,28 +356,29 @@ static WEBP_INLINE void NeedsFilter(const __m128i* const p1,
 // Edge filtering functions
 
 // Applies filter on 2 pixels (p0 and q0)
-static WEBP_INLINE void DoFilter2(__m128i* const p1, __m128i* const p0,
-                                  __m128i* const q0, __m128i* const q1,
-                                  int thresh) {
+static WEBP_INLINE void DoFilter2_SSE2(__m128i* const p1, __m128i* const p0,
+                                       __m128i* const q0, __m128i* const q1,
+                                       int thresh) {
   __m128i a, mask;
   const __m128i sign_bit = _mm_set1_epi8(0x80);
-  // convert p1/q1 to int8_t (for GetBaseDelta)
+  // convert p1/q1 to int8_t (for GetBaseDelta_SSE2)
   const __m128i p1s = _mm_xor_si128(*p1, sign_bit);
   const __m128i q1s = _mm_xor_si128(*q1, sign_bit);
 
-  NeedsFilter(p1, p0, q0, q1, thresh, &mask);
+  NeedsFilter_SSE2(p1, p0, q0, q1, thresh, &mask);
 
   FLIP_SIGN_BIT2(*p0, *q0);
-  GetBaseDelta(&p1s, p0, q0, &q1s, &a);
+  GetBaseDelta_SSE2(&p1s, p0, q0, &q1s, &a);
   a = _mm_and_si128(a, mask);     // mask filter values we don't care about
-  DoSimpleFilter(p0, q0, &a);
+  DoSimpleFilter_SSE2(p0, q0, &a);
   FLIP_SIGN_BIT2(*p0, *q0);
 }
 
 // Applies filter on 4 pixels (p1, p0, q0 and q1)
-static WEBP_INLINE void DoFilter4(__m128i* const p1, __m128i* const p0,
-                                  __m128i* const q0, __m128i* const q1,
-                                  const __m128i* const mask, int hev_thresh) {
+static WEBP_INLINE void DoFilter4_SSE2(__m128i* const p1, __m128i* const p0,
+                                       __m128i* const q0, __m128i* const q1,
+                                       const __m128i* const mask,
+                                       int hev_thresh) {
   const __m128i zero = _mm_setzero_si128();
   const __m128i sign_bit = _mm_set1_epi8(0x80);
   const __m128i k64 = _mm_set1_epi8(64);
@@ -384,7 +388,7 @@ static WEBP_INLINE void DoFilter4(__m128i* const p1, __m128i* const p0,
   __m128i t1, t2, t3;
 
   // compute hev mask
-  GetNotHEV(p1, p0, q0, q1, hev_thresh, &not_hev);
+  GetNotHEV_SSE2(p1, p0, q0, q1, hev_thresh, &not_hev);
 
   // convert to signed values
   FLIP_SIGN_BIT4(*p1, *p0, *q0, *q1);
@@ -399,8 +403,8 @@ static WEBP_INLINE void DoFilter4(__m128i* const p1, __m128i* const p0,
 
   t2 = _mm_adds_epi8(t1, k3);        // 3 * (q0 - p0) + hev(p1 - q1) + 3
   t3 = _mm_adds_epi8(t1, k4);        // 3 * (q0 - p0) + hev(p1 - q1) + 4
-  SignedShift8b(&t2);                // (3 * (q0 - p0) + hev(p1 - q1) + 3) >> 3
-  SignedShift8b(&t3);                // (3 * (q0 - p0) + hev(p1 - q1) + 4) >> 3
+  SignedShift8b_SSE2(&t2);           // (3 * (q0 - p0) + hev(p1 - q1) + 3) >> 3
+  SignedShift8b_SSE2(&t3);           // (3 * (q0 - p0) + hev(p1 - q1) + 4) >> 3
   *p0 = _mm_adds_epi8(*p0, t2);      // p0 += t2
   *q0 = _mm_subs_epi8(*q0, t3);      // q0 -= t3
   FLIP_SIGN_BIT2(*p0, *q0);
@@ -417,25 +421,26 @@ static WEBP_INLINE void DoFilter4(__m128i* const p1, __m128i* const p0,
 }
 
 // Applies filter on 6 pixels (p2, p1, p0, q0, q1 and q2)
-static WEBP_INLINE void DoFilter6(__m128i* const p2, __m128i* const p1,
-                                  __m128i* const p0, __m128i* const q0,
-                                  __m128i* const q1, __m128i* const q2,
-                                  const __m128i* const mask, int hev_thresh) {
+static WEBP_INLINE void DoFilter6_SSE2(__m128i* const p2, __m128i* const p1,
+                                       __m128i* const p0, __m128i* const q0,
+                                       __m128i* const q1, __m128i* const q2,
+                                       const __m128i* const mask,
+                                       int hev_thresh) {
   const __m128i zero = _mm_setzero_si128();
   const __m128i sign_bit = _mm_set1_epi8(0x80);
   __m128i a, not_hev;
 
   // compute hev mask
-  GetNotHEV(p1, p0, q0, q1, hev_thresh, &not_hev);
+  GetNotHEV_SSE2(p1, p0, q0, q1, hev_thresh, &not_hev);
 
   FLIP_SIGN_BIT4(*p1, *p0, *q0, *q1);
   FLIP_SIGN_BIT2(*p2, *q2);
-  GetBaseDelta(p1, p0, q0, q1, &a);
+  GetBaseDelta_SSE2(p1, p0, q0, q1, &a);
 
   { // do simple filter on pixels with hev
     const __m128i m = _mm_andnot_si128(not_hev, *mask);
     const __m128i f = _mm_and_si128(a, m);
-    DoSimpleFilter(p0, q0, &f);
+    DoSimpleFilter_SSE2(p0, q0, &f);
   }
 
   { // do strong filter on pixels with not hev
@@ -460,15 +465,15 @@ static WEBP_INLINE void DoFilter6(__m128i* const p2, __m128i* const p1,
     const __m128i a0_lo = _mm_add_epi16(a1_lo, f9_lo);  // Filter * 27 + 63
     const __m128i a0_hi = _mm_add_epi16(a1_hi, f9_hi);  // Filter * 27 + 63
 
-    Update2Pixels(p2, q2, &a2_lo, &a2_hi);
-    Update2Pixels(p1, q1, &a1_lo, &a1_hi);
-    Update2Pixels(p0, q0, &a0_lo, &a0_hi);
+    Update2Pixels_SSE2(p2, q2, &a2_lo, &a2_hi);
+    Update2Pixels_SSE2(p1, q1, &a1_lo, &a1_hi);
+    Update2Pixels_SSE2(p0, q0, &a0_lo, &a0_hi);
   }
 }
 
 // reads 8 rows across a vertical edge.
-static WEBP_INLINE void Load8x4(const uint8_t* const b, int stride,
-                                __m128i* const p, __m128i* const q) {
+static WEBP_INLINE void Load8x4_SSE2(const uint8_t* const b, int stride,
+                                     __m128i* const p, __m128i* const q) {
   // A0 = 63 62 61 60 23 22 21 20 43 42 41 40 03 02 01 00
   // A1 = 73 72 71 70 33 32 31 30 53 52 51 50 13 12 11 10
   const __m128i A0 = _mm_set_epi32(
@@ -494,11 +499,11 @@ static WEBP_INLINE void Load8x4(const uint8_t* const b, int stride,
   *q = _mm_unpackhi_epi32(C0, C1);
 }
 
-static WEBP_INLINE void Load16x4(const uint8_t* const r0,
-                                 const uint8_t* const r8,
-                                 int stride,
-                                 __m128i* const p1, __m128i* const p0,
-                                 __m128i* const q0, __m128i* const q1) {
+static WEBP_INLINE void Load16x4_SSE2(const uint8_t* const r0,
+                                      const uint8_t* const r8,
+                                      int stride,
+                                      __m128i* const p1, __m128i* const p0,
+                                      __m128i* const q0, __m128i* const q1) {
   // Assume the pixels around the edge (|) are numbered as follows
   //                00 01 | 02 03
   //                10 11 | 12 13
@@ -514,8 +519,8 @@ static WEBP_INLINE void Load16x4(const uint8_t* const r0,
   // q0 = 73 63 53 43 33 23 13 03 72 62 52 42 32 22 12 02
   // p0 = f1 e1 d1 c1 b1 a1 91 81 f0 e0 d0 c0 b0 a0 90 80
   // q1 = f3 e3 d3 c3 b3 a3 93 83 f2 e2 d2 c2 b2 a2 92 82
-  Load8x4(r0, stride, p1, q0);
-  Load8x4(r8, stride, p0, q1);
+  Load8x4_SSE2(r0, stride, p1, q0);
+  Load8x4_SSE2(r8, stride, p0, q1);
 
   {
     // p1 = f0 e0 d0 c0 b0 a0 90 80 70 60 50 40 30 20 10 00
@@ -531,7 +536,8 @@ static WEBP_INLINE void Load16x4(const uint8_t* const r0,
   }
 }
 
-static WEBP_INLINE void Store4x4(__m128i* const x, uint8_t* dst, int stride) {
+static WEBP_INLINE void Store4x4_SSE2(__m128i* const x,
+                                      uint8_t* dst, int stride) {
   int i;
   for (i = 0; i < 4; ++i, dst += stride) {
     WebPUint32ToMem(dst, _mm_cvtsi128_si32(*x));
@@ -540,12 +546,12 @@ static WEBP_INLINE void Store4x4(__m128i* const x, uint8_t* dst, int stride) {
 }
 
 // Transpose back and store
-static WEBP_INLINE void Store16x4(const __m128i* const p1,
-                                  const __m128i* const p0,
-                                  const __m128i* const q0,
-                                  const __m128i* const q1,
-                                  uint8_t* r0, uint8_t* r8,
-                                  int stride) {
+static WEBP_INLINE void Store16x4_SSE2(const __m128i* const p1,
+                                       const __m128i* const p0,
+                                       const __m128i* const q0,
+                                       const __m128i* const q1,
+                                       uint8_t* r0, uint8_t* r8,
+                                       int stride) {
   __m128i t1, p1_s, p0_s, q0_s, q1_s;
 
   // p0 = 71 70 61 60 51 50 41 40 31 30 21 20 11 10 01 00
@@ -572,55 +578,55 @@ static WEBP_INLINE void Store16x4(const __m128i* const p1,
   p1_s = _mm_unpacklo_epi16(t1, q1_s);
   q1_s = _mm_unpackhi_epi16(t1, q1_s);
 
-  Store4x4(&p0_s, r0, stride);
+  Store4x4_SSE2(&p0_s, r0, stride);
   r0 += 4 * stride;
-  Store4x4(&q0_s, r0, stride);
+  Store4x4_SSE2(&q0_s, r0, stride);
 
-  Store4x4(&p1_s, r8, stride);
+  Store4x4_SSE2(&p1_s, r8, stride);
   r8 += 4 * stride;
-  Store4x4(&q1_s, r8, stride);
+  Store4x4_SSE2(&q1_s, r8, stride);
 }
 
 //------------------------------------------------------------------------------
 // Simple In-loop filtering (Paragraph 15.2)
 
-static void SimpleVFilter16(uint8_t* p, int stride, int thresh) {
+static void SimpleVFilter16_SSE2(uint8_t* p, int stride, int thresh) {
   // Load
   __m128i p1 = _mm_loadu_si128((__m128i*)&p[-2 * stride]);
   __m128i p0 = _mm_loadu_si128((__m128i*)&p[-stride]);
   __m128i q0 = _mm_loadu_si128((__m128i*)&p[0]);
   __m128i q1 = _mm_loadu_si128((__m128i*)&p[stride]);
 
-  DoFilter2(&p1, &p0, &q0, &q1, thresh);
+  DoFilter2_SSE2(&p1, &p0, &q0, &q1, thresh);
 
   // Store
   _mm_storeu_si128((__m128i*)&p[-stride], p0);
   _mm_storeu_si128((__m128i*)&p[0], q0);
 }
 
-static void SimpleHFilter16(uint8_t* p, int stride, int thresh) {
+static void SimpleHFilter16_SSE2(uint8_t* p, int stride, int thresh) {
   __m128i p1, p0, q0, q1;
 
   p -= 2;  // beginning of p1
 
-  Load16x4(p, p + 8 * stride, stride, &p1, &p0, &q0, &q1);
-  DoFilter2(&p1, &p0, &q0, &q1, thresh);
-  Store16x4(&p1, &p0, &q0, &q1, p, p + 8 * stride, stride);
+  Load16x4_SSE2(p, p + 8 * stride, stride, &p1, &p0, &q0, &q1);
+  DoFilter2_SSE2(&p1, &p0, &q0, &q1, thresh);
+  Store16x4_SSE2(&p1, &p0, &q0, &q1, p, p + 8 * stride, stride);
 }
 
-static void SimpleVFilter16i(uint8_t* p, int stride, int thresh) {
+static void SimpleVFilter16i_SSE2(uint8_t* p, int stride, int thresh) {
   int k;
   for (k = 3; k > 0; --k) {
     p += 4 * stride;
-    SimpleVFilter16(p, stride, thresh);
+    SimpleVFilter16_SSE2(p, stride, thresh);
   }
 }
 
-static void SimpleHFilter16i(uint8_t* p, int stride, int thresh) {
+static void SimpleHFilter16i_SSE2(uint8_t* p, int stride, int thresh) {
   int k;
   for (k = 3; k > 0; --k) {
     p += 4;
-    SimpleHFilter16(p, stride, thresh);
+    SimpleHFilter16_SSE2(p, stride, thresh);
   }
 }
 
@@ -628,60 +634,60 @@ static void SimpleHFilter16i(uint8_t* p, int stride, int thresh) {
 // Complex In-loop filtering (Paragraph 15.3)
 
 #define MAX_DIFF1(p3, p2, p1, p0, m) do {                                      \
-  m = MM_ABS(p1, p0);                                                          \
-  m = _mm_max_epu8(m, MM_ABS(p3, p2));                                         \
-  m = _mm_max_epu8(m, MM_ABS(p2, p1));                                         \
+  (m) = MM_ABS(p1, p0);                                                        \
+  (m) = _mm_max_epu8(m, MM_ABS(p3, p2));                                       \
+  (m) = _mm_max_epu8(m, MM_ABS(p2, p1));                                       \
 } while (0)
 
 #define MAX_DIFF2(p3, p2, p1, p0, m) do {                                      \
-  m = _mm_max_epu8(m, MM_ABS(p1, p0));                                         \
-  m = _mm_max_epu8(m, MM_ABS(p3, p2));                                         \
-  m = _mm_max_epu8(m, MM_ABS(p2, p1));                                         \
+  (m) = _mm_max_epu8(m, MM_ABS(p1, p0));                                       \
+  (m) = _mm_max_epu8(m, MM_ABS(p3, p2));                                       \
+  (m) = _mm_max_epu8(m, MM_ABS(p2, p1));                                       \
 } while (0)
 
 #define LOAD_H_EDGES4(p, stride, e1, e2, e3, e4) {                             \
-  e1 = _mm_loadu_si128((__m128i*)&(p)[0 * stride]);                            \
-  e2 = _mm_loadu_si128((__m128i*)&(p)[1 * stride]);                            \
-  e3 = _mm_loadu_si128((__m128i*)&(p)[2 * stride]);                            \
-  e4 = _mm_loadu_si128((__m128i*)&(p)[3 * stride]);                            \
+  (e1) = _mm_loadu_si128((__m128i*)&(p)[0 * (stride)]);                        \
+  (e2) = _mm_loadu_si128((__m128i*)&(p)[1 * (stride)]);                        \
+  (e3) = _mm_loadu_si128((__m128i*)&(p)[2 * (stride)]);                        \
+  (e4) = _mm_loadu_si128((__m128i*)&(p)[3 * (stride)]);                        \
 }
 
 #define LOADUV_H_EDGE(p, u, v, stride) do {                                    \
   const __m128i U = _mm_loadl_epi64((__m128i*)&(u)[(stride)]);                 \
   const __m128i V = _mm_loadl_epi64((__m128i*)&(v)[(stride)]);                 \
-  p = _mm_unpacklo_epi64(U, V);                                                \
+  (p) = _mm_unpacklo_epi64(U, V);                                              \
 } while (0)
 
 #define LOADUV_H_EDGES4(u, v, stride, e1, e2, e3, e4) {                        \
-  LOADUV_H_EDGE(e1, u, v, 0 * stride);                                         \
-  LOADUV_H_EDGE(e2, u, v, 1 * stride);                                         \
-  LOADUV_H_EDGE(e3, u, v, 2 * stride);                                         \
-  LOADUV_H_EDGE(e4, u, v, 3 * stride);                                         \
+  LOADUV_H_EDGE(e1, u, v, 0 * (stride));                                       \
+  LOADUV_H_EDGE(e2, u, v, 1 * (stride));                                       \
+  LOADUV_H_EDGE(e3, u, v, 2 * (stride));                                       \
+  LOADUV_H_EDGE(e4, u, v, 3 * (stride));                                       \
 }
 
 #define STOREUV(p, u, v, stride) {                                             \
-  _mm_storel_epi64((__m128i*)&u[(stride)], p);                                 \
-  p = _mm_srli_si128(p, 8);                                                    \
-  _mm_storel_epi64((__m128i*)&v[(stride)], p);                                 \
+  _mm_storel_epi64((__m128i*)&(u)[(stride)], p);                               \
+  (p) = _mm_srli_si128(p, 8);                                                  \
+  _mm_storel_epi64((__m128i*)&(v)[(stride)], p);                               \
 }
 
-static WEBP_INLINE void ComplexMask(const __m128i* const p1,
-                                    const __m128i* const p0,
-                                    const __m128i* const q0,
-                                    const __m128i* const q1,
-                                    int thresh, int ithresh,
-                                    __m128i* const mask) {
+static WEBP_INLINE void ComplexMask_SSE2(const __m128i* const p1,
+                                         const __m128i* const p0,
+                                         const __m128i* const q0,
+                                         const __m128i* const q1,
+                                         int thresh, int ithresh,
+                                         __m128i* const mask) {
   const __m128i it = _mm_set1_epi8(ithresh);
   const __m128i diff = _mm_subs_epu8(*mask, it);
   const __m128i thresh_mask = _mm_cmpeq_epi8(diff, _mm_setzero_si128());
   __m128i filter_mask;
-  NeedsFilter(p1, p0, q0, q1, thresh, &filter_mask);
+  NeedsFilter_SSE2(p1, p0, q0, q1, thresh, &filter_mask);
   *mask = _mm_and_si128(thresh_mask, filter_mask);
 }
 
 // on macroblock edges
-static void VFilter16(uint8_t* p, int stride,
-                      int thresh, int ithresh, int hev_thresh) {
+static void VFilter16_SSE2(uint8_t* p, int stride,
+                           int thresh, int ithresh, int hev_thresh) {
   __m128i t1;
   __m128i mask;
   __m128i p2, p1, p0, q0, q1, q2;
@@ -694,8 +700,8 @@ static void VFilter16(uint8_t* p, int stride,
   LOAD_H_EDGES4(p, stride, q0, q1, q2, t1);
   MAX_DIFF2(t1, q2, q1, q0, mask);
 
-  ComplexMask(&p1, &p0, &q0, &q1, thresh, ithresh, &mask);
-  DoFilter6(&p2, &p1, &p0, &q0, &q1, &q2, &mask, hev_thresh);
+  ComplexMask_SSE2(&p1, &p0, &q0, &q1, thresh, ithresh, &mask);
+  DoFilter6_SSE2(&p2, &p1, &p0, &q0, &q1, &q2, &mask, hev_thresh);
 
   // Store
   _mm_storeu_si128((__m128i*)&p[-3 * stride], p2);
@@ -706,28 +712,28 @@ static void VFilter16(uint8_t* p, int stride,
   _mm_storeu_si128((__m128i*)&p[+2 * stride], q2);
 }
 
-static void HFilter16(uint8_t* p, int stride,
-                      int thresh, int ithresh, int hev_thresh) {
+static void HFilter16_SSE2(uint8_t* p, int stride,
+                           int thresh, int ithresh, int hev_thresh) {
   __m128i mask;
   __m128i p3, p2, p1, p0, q0, q1, q2, q3;
 
   uint8_t* const b = p - 4;
-  Load16x4(b, b + 8 * stride, stride, &p3, &p2, &p1, &p0);  // p3, p2, p1, p0
+  Load16x4_SSE2(b, b + 8 * stride, stride, &p3, &p2, &p1, &p0);
   MAX_DIFF1(p3, p2, p1, p0, mask);
 
-  Load16x4(p, p + 8 * stride, stride, &q0, &q1, &q2, &q3);  // q0, q1, q2, q3
+  Load16x4_SSE2(p, p + 8 * stride, stride, &q0, &q1, &q2, &q3);
   MAX_DIFF2(q3, q2, q1, q0, mask);
 
-  ComplexMask(&p1, &p0, &q0, &q1, thresh, ithresh, &mask);
-  DoFilter6(&p2, &p1, &p0, &q0, &q1, &q2, &mask, hev_thresh);
+  ComplexMask_SSE2(&p1, &p0, &q0, &q1, thresh, ithresh, &mask);
+  DoFilter6_SSE2(&p2, &p1, &p0, &q0, &q1, &q2, &mask, hev_thresh);
 
-  Store16x4(&p3, &p2, &p1, &p0, b, b + 8 * stride, stride);
-  Store16x4(&q0, &q1, &q2, &q3, p, p + 8 * stride, stride);
+  Store16x4_SSE2(&p3, &p2, &p1, &p0, b, b + 8 * stride, stride);
+  Store16x4_SSE2(&q0, &q1, &q2, &q3, p, p + 8 * stride, stride);
 }
 
 // on three inner edges
-static void VFilter16i(uint8_t* p, int stride,
-                       int thresh, int ithresh, int hev_thresh) {
+static void VFilter16i_SSE2(uint8_t* p, int stride,
+                            int thresh, int ithresh, int hev_thresh) {
   int k;
   __m128i p3, p2, p1, p0;   // loop invariants
 
@@ -744,8 +750,8 @@ static void VFilter16i(uint8_t* p, int stride,
 
     // p3 and p2 are not just temporary variables here: they will be
     // re-used for next span. And q2/q3 will become p1/p0 accordingly.
-    ComplexMask(&p1, &p0, &p3, &p2, thresh, ithresh, &mask);
-    DoFilter4(&p1, &p0, &p3, &p2, &mask, hev_thresh);
+    ComplexMask_SSE2(&p1, &p0, &p3, &p2, thresh, ithresh, &mask);
+    DoFilter4_SSE2(&p1, &p0, &p3, &p2, &mask, hev_thresh);
 
     // Store
     _mm_storeu_si128((__m128i*)&b[0 * stride], p1);
@@ -759,12 +765,12 @@ static void VFilter16i(uint8_t* p, int stride,
   }
 }
 
-static void HFilter16i(uint8_t* p, int stride,
-                       int thresh, int ithresh, int hev_thresh) {
+static void HFilter16i_SSE2(uint8_t* p, int stride,
+                            int thresh, int ithresh, int hev_thresh) {
   int k;
   __m128i p3, p2, p1, p0;   // loop invariants
 
-  Load16x4(p, p + 8 * stride, stride, &p3, &p2, &p1, &p0);  // prologue
+  Load16x4_SSE2(p, p + 8 * stride, stride, &p3, &p2, &p1, &p0);  // prologue
 
   for (k = 3; k > 0; --k) {
     __m128i mask, tmp1, tmp2;
@@ -773,13 +779,13 @@ static void HFilter16i(uint8_t* p, int stride,
     p += 4;  // beginning of q0 (and next span)
 
     MAX_DIFF1(p3, p2, p1, p0, mask);   // compute partial mask
-    Load16x4(p, p + 8 * stride, stride, &p3, &p2, &tmp1, &tmp2);
+    Load16x4_SSE2(p, p + 8 * stride, stride, &p3, &p2, &tmp1, &tmp2);
     MAX_DIFF2(p3, p2, tmp1, tmp2, mask);
 
-    ComplexMask(&p1, &p0, &p3, &p2, thresh, ithresh, &mask);
-    DoFilter4(&p1, &p0, &p3, &p2, &mask, hev_thresh);
+    ComplexMask_SSE2(&p1, &p0, &p3, &p2, thresh, ithresh, &mask);
+    DoFilter4_SSE2(&p1, &p0, &p3, &p2, &mask, hev_thresh);
 
-    Store16x4(&p1, &p0, &p3, &p2, b, b + 8 * stride, stride);
+    Store16x4_SSE2(&p1, &p0, &p3, &p2, b, b + 8 * stride, stride);
 
     // rotate samples
     p1 = tmp1;
@@ -788,8 +794,8 @@ static void HFilter16i(uint8_t* p, int stride,
 }
 
 // 8-pixels wide variant, for chroma filtering
-static void VFilter8(uint8_t* u, uint8_t* v, int stride,
-                     int thresh, int ithresh, int hev_thresh) {
+static void VFilter8_SSE2(uint8_t* u, uint8_t* v, int stride,
+                          int thresh, int ithresh, int hev_thresh) {
   __m128i mask;
   __m128i t1, p2, p1, p0, q0, q1, q2;
 
@@ -801,8 +807,8 @@ static void VFilter8(uint8_t* u, uint8_t* v, int stride,
   LOADUV_H_EDGES4(u, v, stride, q0, q1, q2, t1);
   MAX_DIFF2(t1, q2, q1, q0, mask);
 
-  ComplexMask(&p1, &p0, &q0, &q1, thresh, ithresh, &mask);
-  DoFilter6(&p2, &p1, &p0, &q0, &q1, &q2, &mask, hev_thresh);
+  ComplexMask_SSE2(&p1, &p0, &q0, &q1, thresh, ithresh, &mask);
+  DoFilter6_SSE2(&p2, &p1, &p0, &q0, &q1, &q2, &mask, hev_thresh);
 
   // Store
   STOREUV(p2, u, v, -3 * stride);
@@ -813,28 +819,28 @@ static void VFilter8(uint8_t* u, uint8_t* v, int stride,
   STOREUV(q2, u, v, 2 * stride);
 }
 
-static void HFilter8(uint8_t* u, uint8_t* v, int stride,
-                     int thresh, int ithresh, int hev_thresh) {
+static void HFilter8_SSE2(uint8_t* u, uint8_t* v, int stride,
+                          int thresh, int ithresh, int hev_thresh) {
   __m128i mask;
   __m128i p3, p2, p1, p0, q0, q1, q2, q3;
 
   uint8_t* const tu = u - 4;
   uint8_t* const tv = v - 4;
-  Load16x4(tu, tv, stride, &p3, &p2, &p1, &p0);  // p3, p2, p1, p0
+  Load16x4_SSE2(tu, tv, stride, &p3, &p2, &p1, &p0);
   MAX_DIFF1(p3, p2, p1, p0, mask);
 
-  Load16x4(u, v, stride, &q0, &q1, &q2, &q3);    // q0, q1, q2, q3
+  Load16x4_SSE2(u, v, stride, &q0, &q1, &q2, &q3);
   MAX_DIFF2(q3, q2, q1, q0, mask);
 
-  ComplexMask(&p1, &p0, &q0, &q1, thresh, ithresh, &mask);
-  DoFilter6(&p2, &p1, &p0, &q0, &q1, &q2, &mask, hev_thresh);
+  ComplexMask_SSE2(&p1, &p0, &q0, &q1, thresh, ithresh, &mask);
+  DoFilter6_SSE2(&p2, &p1, &p0, &q0, &q1, &q2, &mask, hev_thresh);
 
-  Store16x4(&p3, &p2, &p1, &p0, tu, tv, stride);
-  Store16x4(&q0, &q1, &q2, &q3, u, v, stride);
+  Store16x4_SSE2(&p3, &p2, &p1, &p0, tu, tv, stride);
+  Store16x4_SSE2(&q0, &q1, &q2, &q3, u, v, stride);
 }
 
-static void VFilter8i(uint8_t* u, uint8_t* v, int stride,
-                      int thresh, int ithresh, int hev_thresh) {
+static void VFilter8i_SSE2(uint8_t* u, uint8_t* v, int stride,
+                           int thresh, int ithresh, int hev_thresh) {
   __m128i mask;
   __m128i t1, t2, p1, p0, q0, q1;
 
@@ -849,8 +855,8 @@ static void VFilter8i(uint8_t* u, uint8_t* v, int stride,
   LOADUV_H_EDGES4(u, v, stride, q0, q1, t1, t2);
   MAX_DIFF2(t2, t1, q1, q0, mask);
 
-  ComplexMask(&p1, &p0, &q0, &q1, thresh, ithresh, &mask);
-  DoFilter4(&p1, &p0, &q0, &q1, &mask, hev_thresh);
+  ComplexMask_SSE2(&p1, &p0, &q0, &q1, thresh, ithresh, &mask);
+  DoFilter4_SSE2(&p1, &p0, &q0, &q1, &mask, hev_thresh);
 
   // Store
   STOREUV(p1, u, v, -2 * stride);
@@ -859,24 +865,24 @@ static void VFilter8i(uint8_t* u, uint8_t* v, int stride,
   STOREUV(q1, u, v, 1 * stride);
 }
 
-static void HFilter8i(uint8_t* u, uint8_t* v, int stride,
-                      int thresh, int ithresh, int hev_thresh) {
+static void HFilter8i_SSE2(uint8_t* u, uint8_t* v, int stride,
+                           int thresh, int ithresh, int hev_thresh) {
   __m128i mask;
   __m128i t1, t2, p1, p0, q0, q1;
-  Load16x4(u, v, stride, &t2, &t1, &p1, &p0);   // p3, p2, p1, p0
+  Load16x4_SSE2(u, v, stride, &t2, &t1, &p1, &p0);   // p3, p2, p1, p0
   MAX_DIFF1(t2, t1, p1, p0, mask);
 
   u += 4;  // beginning of q0
   v += 4;
-  Load16x4(u, v, stride, &q0, &q1, &t1, &t2);  // q0, q1, q2, q3
+  Load16x4_SSE2(u, v, stride, &q0, &q1, &t1, &t2);  // q0, q1, q2, q3
   MAX_DIFF2(t2, t1, q1, q0, mask);
 
-  ComplexMask(&p1, &p0, &q0, &q1, thresh, ithresh, &mask);
-  DoFilter4(&p1, &p0, &q0, &q1, &mask, hev_thresh);
+  ComplexMask_SSE2(&p1, &p0, &q0, &q1, thresh, ithresh, &mask);
+  DoFilter4_SSE2(&p1, &p0, &q0, &q1, &mask, hev_thresh);
 
   u -= 2;  // beginning of p1
   v -= 2;
-  Store16x4(&p1, &p0, &q0, &q1, u, v, stride);
+  Store16x4_SSE2(&p1, &p0, &q0, &q1, u, v, stride);
 }
 
 //------------------------------------------------------------------------------
@@ -893,7 +899,7 @@ static void HFilter8i(uint8_t* u, uint8_t* v, int stride,
 //   where: AC = (a + b + 1) >> 1,   BC = (b + c + 1) >> 1
 //   and ab = a ^ b, bc = b ^ c, lsb = (AC^BC)&1
 
-static void VE4(uint8_t* dst) {    // vertical
+static void VE4_SSE2(uint8_t* dst) {    // vertical
   const __m128i one = _mm_set1_epi8(1);
   const __m128i ABCDEFGH = _mm_loadl_epi64((__m128i*)(dst - BPS - 1));
   const __m128i BCDEFGH0 = _mm_srli_si128(ABCDEFGH, 1);
@@ -909,7 +915,7 @@ static void VE4(uint8_t* dst) {    // vertical
   }
 }
 
-static void LD4(uint8_t* dst) {   // Down-Left
+static void LD4_SSE2(uint8_t* dst) {   // Down-Left
   const __m128i one = _mm_set1_epi8(1);
   const __m128i ABCDEFGH = _mm_loadl_epi64((__m128i*)(dst - BPS));
   const __m128i BCDEFGH0 = _mm_srli_si128(ABCDEFGH, 1);
@@ -925,7 +931,7 @@ static void LD4(uint8_t* dst) {   // Down-Left
   WebPUint32ToMem(dst + 3 * BPS, _mm_cvtsi128_si32(_mm_srli_si128(abcdefg, 3)));
 }
 
-static void VR4(uint8_t* dst) {   // Vertical-Right
+static void VR4_SSE2(uint8_t* dst) {   // Vertical-Right
   const __m128i one = _mm_set1_epi8(1);
   const int I = dst[-1 + 0 * BPS];
   const int J = dst[-1 + 1 * BPS];
@@ -950,7 +956,7 @@ static void VR4(uint8_t* dst) {   // Vertical-Right
   DST(0, 3) = AVG3(K, J, I);
 }
 
-static void VL4(uint8_t* dst) {   // Vertical-Left
+static void VL4_SSE2(uint8_t* dst) {   // Vertical-Left
   const __m128i one = _mm_set1_epi8(1);
   const __m128i ABCDEFGH = _mm_loadl_epi64((__m128i*)(dst - BPS));
   const __m128i BCDEFGH_ = _mm_srli_si128(ABCDEFGH, 1);
@@ -975,7 +981,7 @@ static void VL4(uint8_t* dst) {   // Vertical-Left
   DST(3, 3) = (extra_out >> 8) & 0xff;
 }
 
-static void RD4(uint8_t* dst) {   // Down-right
+static void RD4_SSE2(uint8_t* dst) {   // Down-right
   const __m128i one = _mm_set1_epi8(1);
   const __m128i XABCD = _mm_loadl_epi64((__m128i*)(dst - BPS - 1));
   const __m128i ____XABCD = _mm_slli_si128(XABCD, 4);
@@ -1004,7 +1010,7 @@ static void RD4(uint8_t* dst) {   // Down-right
 //------------------------------------------------------------------------------
 // Luma 16x16
 
-static WEBP_INLINE void TrueMotion(uint8_t* dst, int size) {
+static WEBP_INLINE void TrueMotion_SSE2(uint8_t* dst, int size) {
   const uint8_t* top = dst - BPS;
   const __m128i zero = _mm_setzero_si128();
   int y;
@@ -1041,11 +1047,11 @@ static WEBP_INLINE void TrueMotion(uint8_t* dst, int size) {
   }
 }
 
-static void TM4(uint8_t* dst)   { TrueMotion(dst, 4); }
-static void TM8uv(uint8_t* dst) { TrueMotion(dst, 8); }
-static void TM16(uint8_t* dst)  { TrueMotion(dst, 16); }
+static void TM4_SSE2(uint8_t* dst)   { TrueMotion_SSE2(dst, 4); }
+static void TM8uv_SSE2(uint8_t* dst) { TrueMotion_SSE2(dst, 8); }
+static void TM16_SSE2(uint8_t* dst)  { TrueMotion_SSE2(dst, 16); }
 
-static void VE16(uint8_t* dst) {
+static void VE16_SSE2(uint8_t* dst) {
   const __m128i top = _mm_loadu_si128((const __m128i*)(dst - BPS));
   int j;
   for (j = 0; j < 16; ++j) {
@@ -1053,7 +1059,7 @@ static void VE16(uint8_t* dst) {
   }
 }
 
-static void HE16(uint8_t* dst) {     // horizontal
+static void HE16_SSE2(uint8_t* dst) {     // horizontal
   int j;
   for (j = 16; j > 0; --j) {
     const __m128i values = _mm_set1_epi8(dst[-1]);
@@ -1062,7 +1068,7 @@ static void HE16(uint8_t* dst) {     // horizontal
   }
 }
 
-static WEBP_INLINE void Put16(uint8_t v, uint8_t* dst) {
+static WEBP_INLINE void Put16_SSE2(uint8_t v, uint8_t* dst) {
   int j;
   const __m128i values = _mm_set1_epi8(v);
   for (j = 0; j < 16; ++j) {
@@ -1070,7 +1076,7 @@ static WEBP_INLINE void Put16(uint8_t v, uint8_t* dst) {
   }
 }
 
-static void DC16(uint8_t* dst) {    // DC
+static void DC16_SSE2(uint8_t* dst) {  // DC
   const __m128i zero = _mm_setzero_si128();
   const __m128i top = _mm_loadu_si128((const __m128i*)(dst - BPS));
   const __m128i sad8x2 = _mm_sad_epu8(top, zero);
@@ -1083,37 +1089,37 @@ static void DC16(uint8_t* dst) {    // DC
   }
   {
     const int DC = _mm_cvtsi128_si32(sum) + left + 16;
-    Put16(DC >> 5, dst);
+    Put16_SSE2(DC >> 5, dst);
   }
 }
 
-static void DC16NoTop(uint8_t* dst) {   // DC with top samples not available
+static void DC16NoTop_SSE2(uint8_t* dst) {  // DC with top samples unavailable
   int DC = 8;
   int j;
   for (j = 0; j < 16; ++j) {
     DC += dst[-1 + j * BPS];
   }
-  Put16(DC >> 4, dst);
+  Put16_SSE2(DC >> 4, dst);
 }
 
-static void DC16NoLeft(uint8_t* dst) {  // DC with left samples not available
+static void DC16NoLeft_SSE2(uint8_t* dst) {  // DC with left samples unavailable
   const __m128i zero = _mm_setzero_si128();
   const __m128i top = _mm_loadu_si128((const __m128i*)(dst - BPS));
   const __m128i sad8x2 = _mm_sad_epu8(top, zero);
   // sum the two sads: sad8x2[0:1] + sad8x2[8:9]
   const __m128i sum = _mm_add_epi16(sad8x2, _mm_shuffle_epi32(sad8x2, 2));
   const int DC = _mm_cvtsi128_si32(sum) + 8;
-  Put16(DC >> 4, dst);
+  Put16_SSE2(DC >> 4, dst);
 }
 
-static void DC16NoTopLeft(uint8_t* dst) {  // DC with no top and left samples
-  Put16(0x80, dst);
+static void DC16NoTopLeft_SSE2(uint8_t* dst) {  // DC with no top & left samples
+  Put16_SSE2(0x80, dst);
 }
 
 //------------------------------------------------------------------------------
 // Chroma
 
-static void VE8uv(uint8_t* dst) {    // vertical
+static void VE8uv_SSE2(uint8_t* dst) {    // vertical
   int j;
   const __m128i top = _mm_loadl_epi64((const __m128i*)(dst - BPS));
   for (j = 0; j < 8; ++j) {
@@ -1121,17 +1127,8 @@ static void VE8uv(uint8_t* dst) {    // vertical
   }
 }
 
-static void HE8uv(uint8_t* dst) {    // horizontal
-  int j;
-  for (j = 0; j < 8; ++j) {
-    const __m128i values = _mm_set1_epi8(dst[-1]);
-    _mm_storel_epi64((__m128i*)dst, values);
-    dst += BPS;
-  }
-}
-
 // helper for chroma-DC predictions
-static WEBP_INLINE void Put8x8uv(uint8_t v, uint8_t* dst) {
+static WEBP_INLINE void Put8x8uv_SSE2(uint8_t v, uint8_t* dst) {
   int j;
   const __m128i values = _mm_set1_epi8(v);
   for (j = 0; j < 8; ++j) {
@@ -1139,7 +1136,7 @@ static WEBP_INLINE void Put8x8uv(uint8_t v, uint8_t* dst) {
   }
 }
 
-static void DC8uv(uint8_t* dst) {     // DC
+static void DC8uv_SSE2(uint8_t* dst) {     // DC
   const __m128i zero = _mm_setzero_si128();
   const __m128i top = _mm_loadl_epi64((const __m128i*)(dst - BPS));
   const __m128i sum = _mm_sad_epu8(top, zero);
@@ -1150,29 +1147,29 @@ static void DC8uv(uint8_t* dst) {     // DC
   }
   {
     const int DC = _mm_cvtsi128_si32(sum) + left + 8;
-    Put8x8uv(DC >> 4, dst);
+    Put8x8uv_SSE2(DC >> 4, dst);
   }
 }
 
-static void DC8uvNoLeft(uint8_t* dst) {   // DC with no left samples
+static void DC8uvNoLeft_SSE2(uint8_t* dst) {   // DC with no left samples
   const __m128i zero = _mm_setzero_si128();
   const __m128i top = _mm_loadl_epi64((const __m128i*)(dst - BPS));
   const __m128i sum = _mm_sad_epu8(top, zero);
   const int DC = _mm_cvtsi128_si32(sum) + 4;
-  Put8x8uv(DC >> 3, dst);
+  Put8x8uv_SSE2(DC >> 3, dst);
 }
 
-static void DC8uvNoTop(uint8_t* dst) {  // DC with no top samples
+static void DC8uvNoTop_SSE2(uint8_t* dst) {  // DC with no top samples
   int dc0 = 4;
   int i;
   for (i = 0; i < 8; ++i) {
     dc0 += dst[-1 + i * BPS];
   }
-  Put8x8uv(dc0 >> 3, dst);
+  Put8x8uv_SSE2(dc0 >> 3, dst);
 }
 
-static void DC8uvNoTopLeft(uint8_t* dst) {    // DC with nothing
-  Put8x8uv(0x80, dst);
+static void DC8uvNoTopLeft_SSE2(uint8_t* dst) {    // DC with nothing
+  Put8x8uv_SSE2(0x80, dst);
 }
 
 //------------------------------------------------------------------------------
@@ -1181,47 +1178,46 @@ static void DC8uvNoTopLeft(uint8_t* dst) {    // DC with nothing
 extern void VP8DspInitSSE2(void);
 
 WEBP_TSAN_IGNORE_FUNCTION void VP8DspInitSSE2(void) {
-  VP8Transform = Transform;
-#if defined(USE_TRANSFORM_AC3)
-  VP8TransformAC3 = TransformAC3;
+  VP8Transform = Transform_SSE2;
+#if (USE_TRANSFORM_AC3 == 1)
+  VP8TransformAC3 = TransformAC3_SSE2;
 #endif
 
-  VP8VFilter16 = VFilter16;
-  VP8HFilter16 = HFilter16;
-  VP8VFilter8 = VFilter8;
-  VP8HFilter8 = HFilter8;
-  VP8VFilter16i = VFilter16i;
-  VP8HFilter16i = HFilter16i;
-  VP8VFilter8i = VFilter8i;
-  VP8HFilter8i = HFilter8i;
-
-  VP8SimpleVFilter16 = SimpleVFilter16;
-  VP8SimpleHFilter16 = SimpleHFilter16;
-  VP8SimpleVFilter16i = SimpleVFilter16i;
-  VP8SimpleHFilter16i = SimpleHFilter16i;
-
-  VP8PredLuma4[1] = TM4;
-  VP8PredLuma4[2] = VE4;
-  VP8PredLuma4[4] = RD4;
-  VP8PredLuma4[5] = VR4;
-  VP8PredLuma4[6] = LD4;
-  VP8PredLuma4[7] = VL4;
-
-  VP8PredLuma16[0] = DC16;
-  VP8PredLuma16[1] = TM16;
-  VP8PredLuma16[2] = VE16;
-  VP8PredLuma16[3] = HE16;
-  VP8PredLuma16[4] = DC16NoTop;
-  VP8PredLuma16[5] = DC16NoLeft;
-  VP8PredLuma16[6] = DC16NoTopLeft;
-
-  VP8PredChroma8[0] = DC8uv;
-  VP8PredChroma8[1] = TM8uv;
-  VP8PredChroma8[2] = VE8uv;
-  VP8PredChroma8[3] = HE8uv;
-  VP8PredChroma8[4] = DC8uvNoTop;
-  VP8PredChroma8[5] = DC8uvNoLeft;
-  VP8PredChroma8[6] = DC8uvNoTopLeft;
+  VP8VFilter16 = VFilter16_SSE2;
+  VP8HFilter16 = HFilter16_SSE2;
+  VP8VFilter8 = VFilter8_SSE2;
+  VP8HFilter8 = HFilter8_SSE2;
+  VP8VFilter16i = VFilter16i_SSE2;
+  VP8HFilter16i = HFilter16i_SSE2;
+  VP8VFilter8i = VFilter8i_SSE2;
+  VP8HFilter8i = HFilter8i_SSE2;
+
+  VP8SimpleVFilter16 = SimpleVFilter16_SSE2;
+  VP8SimpleHFilter16 = SimpleHFilter16_SSE2;
+  VP8SimpleVFilter16i = SimpleVFilter16i_SSE2;
+  VP8SimpleHFilter16i = SimpleHFilter16i_SSE2;
+
+  VP8PredLuma4[1] = TM4_SSE2;
+  VP8PredLuma4[2] = VE4_SSE2;
+  VP8PredLuma4[4] = RD4_SSE2;
+  VP8PredLuma4[5] = VR4_SSE2;
+  VP8PredLuma4[6] = LD4_SSE2;
+  VP8PredLuma4[7] = VL4_SSE2;
+
+  VP8PredLuma16[0] = DC16_SSE2;
+  VP8PredLuma16[1] = TM16_SSE2;
+  VP8PredLuma16[2] = VE16_SSE2;
+  VP8PredLuma16[3] = HE16_SSE2;
+  VP8PredLuma16[4] = DC16NoTop_SSE2;
+  VP8PredLuma16[5] = DC16NoLeft_SSE2;
+  VP8PredLuma16[6] = DC16NoTopLeft_SSE2;
+
+  VP8PredChroma8[0] = DC8uv_SSE2;
+  VP8PredChroma8[1] = TM8uv_SSE2;
+  VP8PredChroma8[2] = VE8uv_SSE2;
+  VP8PredChroma8[4] = DC8uvNoTop_SSE2;
+  VP8PredChroma8[5] = DC8uvNoLeft_SSE2;
+  VP8PredChroma8[6] = DC8uvNoTopLeft_SSE2;
 }
 
 #else  // !WEBP_USE_SSE2
diff --git a/media/libwebp/dsp/dec_sse41.c b/media/libwebp/dsp/dec_sse41.c
index 4e81ec4d80..02deae9563 100644
--- a/media/libwebp/dsp/dec_sse41.c
+++ b/media/libwebp/dsp/dec_sse41.c
@@ -11,7 +11,7 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#include "./dsp.h"
+#include "../dsp/dsp.h"
 
 #if defined(WEBP_USE_SSE41)
 
@@ -19,7 +19,7 @@
 #include "../dec/vp8i_dec.h"
 #include "../utils/utils.h"
 
-static void HE16(uint8_t* dst) {     // horizontal
+static void HE16_SSE41(uint8_t* dst) {     // horizontal
   int j;
   const __m128i kShuffle3 = _mm_set1_epi8(3);
   for (j = 16; j > 0; --j) {
@@ -36,7 +36,7 @@ static void HE16(uint8_t* dst) {     // horizontal
 extern void VP8DspInitSSE41(void);
 
 WEBP_TSAN_IGNORE_FUNCTION void VP8DspInitSSE41(void) {
-  VP8PredLuma16[3] = HE16;
+  VP8PredLuma16[3] = HE16_SSE41;
 }
 
 #else  // !WEBP_USE_SSE41
diff --git a/media/libwebp/dsp/dsp.h b/media/libwebp/dsp/dsp.h
index 813fed4a35..537ea20440 100644
--- a/media/libwebp/dsp/dsp.h
+++ b/media/libwebp/dsp/dsp.h
@@ -38,10 +38,22 @@ extern "C" {
 # define LOCAL_GCC_PREREQ(maj, min) 0
 #endif
 
+#if defined(__clang__)
+# define LOCAL_CLANG_VERSION ((__clang_major__ << 8) | __clang_minor__)
+# define LOCAL_CLANG_PREREQ(maj, min) \
+    (LOCAL_CLANG_VERSION >= (((maj) << 8) | (min)))
+#else
+# define LOCAL_CLANG_VERSION 0
+# define LOCAL_CLANG_PREREQ(maj, min) 0
+#endif
+
 #ifndef __has_builtin
 # define __has_builtin(x) 0
 #endif
 
+// for now, none of the optimizations below are available in emscripten
+#if !defined(EMSCRIPTEN)
+
 #if defined(_MSC_VER) && _MSC_VER > 1310 && \
     (defined(_M_X64) || defined(_M_IX86))
 #define WEBP_MSC_SSE2  // Visual C++ SSE2 targets
@@ -68,18 +80,20 @@ extern "C" {
 #define WEBP_USE_AVX2
 #endif
 
-#if defined(__ANDROID__) && defined(__ARM_ARCH_7A__)
-#define WEBP_ANDROID_NEON  // Android targets that might support NEON
-#endif
-
 // The intrinsics currently cause compiler errors with arm-nacl-gcc and the
 // inline assembly would need to be modified for use with Native Client.
-#if (defined(__ARM_NEON__) || defined(WEBP_ANDROID_NEON) || \
+#if (defined(__ARM_NEON__) || \
      defined(__aarch64__) || defined(WEBP_HAVE_NEON)) && \
     !defined(__native_client__)
 #define WEBP_USE_NEON
 #endif
 
+#if !defined(WEBP_USE_NEON) && defined(__ANDROID__) && \
+    defined(__ARM_ARCH_7A__) && defined(HAVE_CPU_FEATURES_H)
+#define WEBP_ANDROID_NEON  // Android targets that may have NEON
+#define WEBP_USE_NEON
+#endif
+
 #if defined(_MSC_VER) && _MSC_VER >= 1700 && defined(_M_ARM)
 #define WEBP_USE_NEON
 #define WEBP_USE_INTRINSICS
@@ -90,7 +104,7 @@ extern "C" {
 #define WEBP_USE_MIPS32
 #if (__mips_isa_rev >= 2)
 #define WEBP_USE_MIPS32_R2
-#if defined(__mips_dspr2) || (__mips_dsp_rev >= 2)
+#if defined(__mips_dspr2) || (defined(__mips_dsp_rev) && __mips_dsp_rev >= 2)
 #define WEBP_USE_MIPS_DSP_R2
 #endif
 #endif
@@ -100,6 +114,24 @@ extern "C" {
 #define WEBP_USE_MSA
 #endif
 
+#endif  /* EMSCRIPTEN */
+
+#ifndef WEBP_DSP_OMIT_C_CODE
+#define WEBP_DSP_OMIT_C_CODE 1
+#endif
+
+#if (defined(__aarch64__) || defined(__ARM_NEON__)) && WEBP_DSP_OMIT_C_CODE
+#define WEBP_NEON_OMIT_C_CODE 1
+#else
+#define WEBP_NEON_OMIT_C_CODE 0
+#endif
+
+#if !(LOCAL_CLANG_PREREQ(3,8) || LOCAL_GCC_PREREQ(4,8) || defined(__aarch64__))
+#define WEBP_NEON_WORK_AROUND_GCC 1
+#else
+#define WEBP_NEON_WORK_AROUND_GCC 0
+#endif
+
 // This macro prevents thread_sanitizer from reporting known concurrent writes.
 #define WEBP_TSAN_IGNORE_FUNCTION
 #if defined(__has_feature)
@@ -109,6 +141,42 @@ extern "C" {
 #endif
 #endif
 
+#if defined(WEBP_USE_THREAD) && !defined(_WIN32)
+#include <pthread.h>  // NOLINT
+
+#define WEBP_DSP_INIT(func) do {                                    \
+  static volatile VP8CPUInfo func ## _last_cpuinfo_used =           \
+      (VP8CPUInfo)&func ## _last_cpuinfo_used;                      \
+  static pthread_mutex_t func ## _lock = PTHREAD_MUTEX_INITIALIZER; \
+  if (pthread_mutex_lock(&func ## _lock)) break;                    \
+  if (func ## _last_cpuinfo_used != VP8GetCPUInfo) func();          \
+  func ## _last_cpuinfo_used = VP8GetCPUInfo;                       \
+  (void)pthread_mutex_unlock(&func ## _lock);                       \
+} while (0)
+#else  // !(defined(WEBP_USE_THREAD) && !defined(_WIN32))
+#define WEBP_DSP_INIT(func) do {                                    \
+  static volatile VP8CPUInfo func ## _last_cpuinfo_used =           \
+      (VP8CPUInfo)&func ## _last_cpuinfo_used;                      \
+  if (func ## _last_cpuinfo_used == VP8GetCPUInfo) break;           \
+  func();                                                           \
+  func ## _last_cpuinfo_used = VP8GetCPUInfo;                       \
+} while (0)
+#endif  // defined(WEBP_USE_THREAD) && !defined(_WIN32)
+
+// Defines an Init + helper function that control multiple initialization of
+// function pointers / tables.
+/* Usage:
+   WEBP_DSP_INIT_FUNC(InitFunc) {
+     ...function body
+   }
+*/
+#define WEBP_DSP_INIT_FUNC(name)                             \
+  static WEBP_TSAN_IGNORE_FUNCTION void name ## _body(void); \
+  WEBP_TSAN_IGNORE_FUNCTION void name(void) {                \
+    WEBP_DSP_INIT(name ## _body);                            \
+  }                                                          \
+  static WEBP_TSAN_IGNORE_FUNCTION void name ## _body(void)
+
 #define WEBP_UBSAN_IGNORE_UNDEF
 #define WEBP_UBSAN_IGNORE_UNSIGNED_OVERFLOW
 #if defined(__clang__) && defined(__has_attribute)
@@ -129,6 +197,18 @@ extern "C" {
 #endif
 #endif
 
+// Regularize the definition of WEBP_SWAP_16BIT_CSP (backward compatibility)
+#if !defined(WEBP_SWAP_16BIT_CSP)
+#define WEBP_SWAP_16BIT_CSP 0
+#endif
+
+// some endian fix (e.g.: mips-gcc doesn't define __BIG_ENDIAN__)
+#if !defined(WORDS_BIGENDIAN) && \
+    (defined(__BIG_ENDIAN__) || defined(_M_PPC) || \
+     (defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)))
+#define WORDS_BIGENDIAN
+#endif
+
 typedef enum {
   kSSE2,
   kSSE3,
@@ -143,7 +223,7 @@ typedef enum {
 } CPUFeature;
 // returns true if the CPU supports the feature.
 typedef int (*VP8CPUInfo)(CPUFeature feature);
-WEBP_EXTERN(VP8CPUInfo) VP8GetCPUInfo;
+WEBP_EXTERN VP8CPUInfo VP8GetCPUInfo;
 
 //------------------------------------------------------------------------------
 // Init stub generator
@@ -152,7 +232,7 @@ WEBP_EXTERN(VP8CPUInfo) VP8GetCPUInfo;
 // avoiding a compiler warning.
 #define WEBP_DSP_INIT_STUB(func) \
   extern void func(void); \
-  WEBP_TSAN_IGNORE_FUNCTION void func(void) {}
+  void func(void) {}
 
 //------------------------------------------------------------------------------
 // Encoding
@@ -271,6 +351,7 @@ typedef double (*VP8SSIMGetClippedFunc)(const uint8_t* src1, int stride1,
                                         int xo, int yo,  // center position
                                         int W, int H);   // plane dimension
 
+#if !defined(WEBP_REDUCE_SIZE)
 // This version is called with the guarantee that you can load 8 bytes and
 // 8 rows at offset src1 and src2
 typedef double (*VP8SSIMGetFunc)(const uint8_t* src1, int stride1,
@@ -278,10 +359,13 @@ typedef double (*VP8SSIMGetFunc)(const uint8_t* src1, int stride1,
 
 extern VP8SSIMGetFunc VP8SSIMGet;         // unclipped / unchecked
 extern VP8SSIMGetClippedFunc VP8SSIMGetClipped;   // with clipping
+#endif
 
+#if !defined(WEBP_DISABLE_STATS)
 typedef uint32_t (*VP8AccumulateSSEFunc)(const uint8_t* src1,
                                          const uint8_t* src2, int len);
 extern VP8AccumulateSSEFunc VP8AccumulateSSE;
+#endif
 
 // must be called before using any of the above directly
 void VP8SSIMDspInit(void);
@@ -462,12 +546,12 @@ extern WebPRescalerExportRowFunc WebPRescalerExportRowExpand;
 extern WebPRescalerExportRowFunc WebPRescalerExportRowShrink;
 
 // Plain-C implementation, as fall-back.
-extern void WebPRescalerImportRowExpandC(struct WebPRescaler* const wrk,
-                                         const uint8_t* src);
-extern void WebPRescalerImportRowShrinkC(struct WebPRescaler* const wrk,
-                                         const uint8_t* src);
-extern void WebPRescalerExportRowExpandC(struct WebPRescaler* const wrk);
-extern void WebPRescalerExportRowShrinkC(struct WebPRescaler* const wrk);
+extern void WebPRescalerImportRowExpand_C(struct WebPRescaler* const wrk,
+                                          const uint8_t* src);
+extern void WebPRescalerImportRowShrink_C(struct WebPRescaler* const wrk,
+                                          const uint8_t* src);
+extern void WebPRescalerExportRowExpand_C(struct WebPRescaler* const wrk);
+extern void WebPRescalerExportRowShrink_C(struct WebPRescaler* const wrk);
 
 // Main entry calls:
 extern void WebPRescalerImportRow(struct WebPRescaler* const wrk,
@@ -533,24 +617,28 @@ void WebPMultRows(uint8_t* ptr, int stride,
                   int width, int num_rows, int inverse);
 
 // Plain-C versions, used as fallback by some implementations.
-void WebPMultRowC(uint8_t* const ptr, const uint8_t* const alpha,
-                  int width, int inverse);
-void WebPMultARGBRowC(uint32_t* const ptr, int width, int inverse);
-
-// To be called first before using the above.
-void WebPInitAlphaProcessing(void);
+void WebPMultRow_C(uint8_t* const ptr, const uint8_t* const alpha,
+                   int width, int inverse);
+void WebPMultARGBRow_C(uint32_t* const ptr, int width, int inverse);
 
+#ifdef WORDS_BIGENDIAN
 // ARGB packing function: a/r/g/b input is rgba or bgra order.
-extern void (*VP8PackARGB)(const uint8_t* a, const uint8_t* r,
-                           const uint8_t* g, const uint8_t* b, int len,
-                           uint32_t* out);
+extern void (*WebPPackARGB)(const uint8_t* a, const uint8_t* r,
+                            const uint8_t* g, const uint8_t* b, int len,
+                            uint32_t* out);
+#endif
 
 // RGB packing function. 'step' can be 3 or 4. r/g/b input is rgb or bgr order.
-extern void (*VP8PackRGB)(const uint8_t* r, const uint8_t* g, const uint8_t* b,
-                          int len, int step, uint32_t* out);
+extern void (*WebPPackRGB)(const uint8_t* r, const uint8_t* g, const uint8_t* b,
+                           int len, int step, uint32_t* out);
+
+// This function returns true if src[i] contains a value different from 0xff.
+extern int (*WebPHasAlpha8b)(const uint8_t* src, int length);
+// This function returns true if src[4*i] contains a value different from 0xff.
+extern int (*WebPHasAlpha32b)(const uint8_t* src, int length);
 
 // To be called first before using the above.
-void VP8EncDspARGBInit(void);
+void WebPInitAlphaProcessing(void);
 
 //------------------------------------------------------------------------------
 // Filter functions
diff --git a/media/libwebp/dsp/filters.c b/media/libwebp/dsp/filters.c
index 65f34aad1f..dea3eb4101 100644
--- a/media/libwebp/dsp/filters.c
+++ b/media/libwebp/dsp/filters.c
@@ -11,7 +11,7 @@
 //
 // Author: Urvang (urvang@google.com)
 
-#include "./dsp.h"
+#include "../dsp/dsp.h"
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>
@@ -20,16 +20,17 @@
 // Helpful macro.
 
 # define SANITY_CHECK(in, out)                                                 \
-  assert(in != NULL);                                                          \
-  assert(out != NULL);                                                         \
+  assert((in) != NULL);                                                        \
+  assert((out) != NULL);                                                       \
   assert(width > 0);                                                           \
   assert(height > 0);                                                          \
   assert(stride >= width);                                                     \
   assert(row >= 0 && num_rows > 0 && row + num_rows <= height);                \
   (void)height;  // Silence unused warning.
 
-static WEBP_INLINE void PredictLine(const uint8_t* src, const uint8_t* pred,
-                                    uint8_t* dst, int length, int inverse) {
+#if !WEBP_NEON_OMIT_C_CODE
+static WEBP_INLINE void PredictLine_C(const uint8_t* src, const uint8_t* pred,
+                                      uint8_t* dst, int length, int inverse) {
   int i;
   if (inverse) {
     for (i = 0; i < length; ++i) dst[i] = src[i] + pred[i];
@@ -41,10 +42,10 @@ static WEBP_INLINE void PredictLine(const uint8_t* src, const uint8_t* pred,
 //------------------------------------------------------------------------------
 // Horizontal filter.
 
-static WEBP_INLINE void DoHorizontalFilter(const uint8_t* in,
-                                           int width, int height, int stride,
-                                           int row, int num_rows,
-                                           int inverse, uint8_t* out) {
+static WEBP_INLINE void DoHorizontalFilter_C(const uint8_t* in,
+                                             int width, int height, int stride,
+                                             int row, int num_rows,
+                                             int inverse, uint8_t* out) {
   const uint8_t* preds;
   const size_t start_offset = row * stride;
   const int last_row = row + num_rows;
@@ -56,7 +57,7 @@ static WEBP_INLINE void DoHorizontalFilter(const uint8_t* in,
   if (row == 0) {
     // Leftmost pixel is the same as input for topmost scanline.
     out[0] = in[0];
-    PredictLine(in + 1, preds, out + 1, width - 1, inverse);
+    PredictLine_C(in + 1, preds, out + 1, width - 1, inverse);
     row = 1;
     preds += stride;
     in += stride;
@@ -66,8 +67,8 @@ static WEBP_INLINE void DoHorizontalFilter(const uint8_t* in,
   // Filter line-by-line.
   while (row < last_row) {
     // Leftmost pixel is predicted from above.
-    PredictLine(in, preds - stride, out, 1, inverse);
-    PredictLine(in + 1, preds, out + 1, width - 1, inverse);
+    PredictLine_C(in, preds - stride, out, 1, inverse);
+    PredictLine_C(in + 1, preds, out + 1, width - 1, inverse);
     ++row;
     preds += stride;
     in += stride;
@@ -78,10 +79,10 @@ static WEBP_INLINE void DoHorizontalFilter(const uint8_t* in,
 //------------------------------------------------------------------------------
 // Vertical filter.
 
-static WEBP_INLINE void DoVerticalFilter(const uint8_t* in,
-                                         int width, int height, int stride,
-                                         int row, int num_rows,
-                                         int inverse, uint8_t* out) {
+static WEBP_INLINE void DoVerticalFilter_C(const uint8_t* in,
+                                           int width, int height, int stride,
+                                           int row, int num_rows,
+                                           int inverse, uint8_t* out) {
   const uint8_t* preds;
   const size_t start_offset = row * stride;
   const int last_row = row + num_rows;
@@ -94,7 +95,7 @@ static WEBP_INLINE void DoVerticalFilter(const uint8_t* in,
     // Very first top-left pixel is copied.
     out[0] = in[0];
     // Rest of top scan-line is left-predicted.
-    PredictLine(in + 1, preds, out + 1, width - 1, inverse);
+    PredictLine_C(in + 1, preds, out + 1, width - 1, inverse);
     row = 1;
     in += stride;
     out += stride;
@@ -105,26 +106,28 @@ static WEBP_INLINE void DoVerticalFilter(const uint8_t* in,
 
   // Filter line-by-line.
   while (row < last_row) {
-    PredictLine(in, preds, out, width, inverse);
+    PredictLine_C(in, preds, out, width, inverse);
     ++row;
     preds += stride;
     in += stride;
     out += stride;
   }
 }
+#endif  // !WEBP_NEON_OMIT_C_CODE
 
 //------------------------------------------------------------------------------
 // Gradient filter.
 
-static WEBP_INLINE int GradientPredictor(uint8_t a, uint8_t b, uint8_t c) {
+static WEBP_INLINE int GradientPredictor_C(uint8_t a, uint8_t b, uint8_t c) {
   const int g = a + b - c;
   return ((g & ~0xff) == 0) ? g : (g < 0) ? 0 : 255;  // clip to 8bit
 }
 
-static WEBP_INLINE void DoGradientFilter(const uint8_t* in,
-                                         int width, int height, int stride,
-                                         int row, int num_rows,
-                                         int inverse, uint8_t* out) {
+#if !WEBP_NEON_OMIT_C_CODE
+static WEBP_INLINE void DoGradientFilter_C(const uint8_t* in,
+                                           int width, int height, int stride,
+                                           int row, int num_rows,
+                                           int inverse, uint8_t* out) {
   const uint8_t* preds;
   const size_t start_offset = row * stride;
   const int last_row = row + num_rows;
@@ -136,7 +139,7 @@ static WEBP_INLINE void DoGradientFilter(const uint8_t* in,
   // left prediction for top scan-line
   if (row == 0) {
     out[0] = in[0];
-    PredictLine(in + 1, preds, out + 1, width - 1, inverse);
+    PredictLine_C(in + 1, preds, out + 1, width - 1, inverse);
     row = 1;
     preds += stride;
     in += stride;
@@ -147,11 +150,11 @@ static WEBP_INLINE void DoGradientFilter(const uint8_t* in,
   while (row < last_row) {
     int w;
     // leftmost pixel: predict from above.
-    PredictLine(in, preds - stride, out, 1, inverse);
+    PredictLine_C(in, preds - stride, out, 1, inverse);
     for (w = 1; w < width; ++w) {
-      const int pred = GradientPredictor(preds[w - 1],
-                                         preds[w - stride],
-                                         preds[w - stride - 1]);
+      const int pred = GradientPredictor_C(preds[w - 1],
+                                           preds[w - stride],
+                                           preds[w - stride - 1]);
       out[w] = in[w] + (inverse ? pred : -pred);
     }
     ++row;
@@ -160,32 +163,34 @@ static WEBP_INLINE void DoGradientFilter(const uint8_t* in,
     out += stride;
   }
 }
+#endif  // !WEBP_NEON_OMIT_C_CODE
 
 #undef SANITY_CHECK
 
 //------------------------------------------------------------------------------
 
-static void HorizontalFilter(const uint8_t* data, int width, int height,
-                             int stride, uint8_t* filtered_data) {
-  DoHorizontalFilter(data, width, height, stride, 0, height, 0, filtered_data);
+#if !WEBP_NEON_OMIT_C_CODE
+static void HorizontalFilter_C(const uint8_t* data, int width, int height,
+                               int stride, uint8_t* filtered_data) {
+  DoHorizontalFilter_C(data, width, height, stride, 0, height, 0,
+                       filtered_data);
 }
 
-static void VerticalFilter(const uint8_t* data, int width, int height,
-                           int stride, uint8_t* filtered_data) {
-  DoVerticalFilter(data, width, height, stride, 0, height, 0, filtered_data);
+static void VerticalFilter_C(const uint8_t* data, int width, int height,
+                             int stride, uint8_t* filtered_data) {
+  DoVerticalFilter_C(data, width, height, stride, 0, height, 0, filtered_data);
 }
 
-
-static void GradientFilter(const uint8_t* data, int width, int height,
-                           int stride, uint8_t* filtered_data) {
-  DoGradientFilter(data, width, height, stride, 0, height, 0, filtered_data);
+static void GradientFilter_C(const uint8_t* data, int width, int height,
+                             int stride, uint8_t* filtered_data) {
+  DoGradientFilter_C(data, width, height, stride, 0, height, 0, filtered_data);
 }
-
+#endif  // !WEBP_NEON_OMIT_C_CODE
 
 //------------------------------------------------------------------------------
 
-static void HorizontalUnfilter(const uint8_t* prev, const uint8_t* in,
-                               uint8_t* out, int width) {
+static void HorizontalUnfilter_C(const uint8_t* prev, const uint8_t* in,
+                                 uint8_t* out, int width) {
   uint8_t pred = (prev == NULL) ? 0 : prev[0];
   int i;
   for (i = 0; i < width; ++i) {
@@ -194,26 +199,28 @@ static void HorizontalUnfilter(const uint8_t* prev, const uint8_t* in,
   }
 }
 
-static void VerticalUnfilter(const uint8_t* prev, const uint8_t* in,
-                             uint8_t* out, int width) {
+#if !WEBP_NEON_OMIT_C_CODE
+static void VerticalUnfilter_C(const uint8_t* prev, const uint8_t* in,
+                               uint8_t* out, int width) {
   if (prev == NULL) {
-    HorizontalUnfilter(NULL, in, out, width);
+    HorizontalUnfilter_C(NULL, in, out, width);
   } else {
     int i;
     for (i = 0; i < width; ++i) out[i] = prev[i] + in[i];
   }
 }
+#endif  // !WEBP_NEON_OMIT_C_CODE
 
-static void GradientUnfilter(const uint8_t* prev, const uint8_t* in,
-                             uint8_t* out, int width) {
+static void GradientUnfilter_C(const uint8_t* prev, const uint8_t* in,
+                               uint8_t* out, int width) {
   if (prev == NULL) {
-    HorizontalUnfilter(NULL, in, out, width);
+    HorizontalUnfilter_C(NULL, in, out, width);
   } else {
     uint8_t top = prev[0], top_left = top, left = top;
     int i;
     for (i = 0; i < width; ++i) {
       top = prev[i];  // need to read this first, in case prev==out
-      left = in[i] + GradientPredictor(left, top, top_left);
+      left = in[i] + GradientPredictor_C(left, top, top_left);
       top_left = top;
       out[i] = left;
     }
@@ -231,21 +238,20 @@ extern void VP8FiltersInitMSA(void);
 extern void VP8FiltersInitNEON(void);
 extern void VP8FiltersInitSSE2(void);
 
-static volatile VP8CPUInfo filters_last_cpuinfo_used =
-    (VP8CPUInfo)&filters_last_cpuinfo_used;
-
-WEBP_TSAN_IGNORE_FUNCTION void VP8FiltersInit(void) {
-  if (filters_last_cpuinfo_used == VP8GetCPUInfo) return;
-
+WEBP_DSP_INIT_FUNC(VP8FiltersInit) {
   WebPUnfilters[WEBP_FILTER_NONE] = NULL;
-  WebPUnfilters[WEBP_FILTER_HORIZONTAL] = HorizontalUnfilter;
-  WebPUnfilters[WEBP_FILTER_VERTICAL] = VerticalUnfilter;
-  WebPUnfilters[WEBP_FILTER_GRADIENT] = GradientUnfilter;
+#if !WEBP_NEON_OMIT_C_CODE
+  WebPUnfilters[WEBP_FILTER_HORIZONTAL] = HorizontalUnfilter_C;
+  WebPUnfilters[WEBP_FILTER_VERTICAL] = VerticalUnfilter_C;
+#endif
+  WebPUnfilters[WEBP_FILTER_GRADIENT] = GradientUnfilter_C;
 
   WebPFilters[WEBP_FILTER_NONE] = NULL;
-  WebPFilters[WEBP_FILTER_HORIZONTAL] = HorizontalFilter;
-  WebPFilters[WEBP_FILTER_VERTICAL] = VerticalFilter;
-  WebPFilters[WEBP_FILTER_GRADIENT] = GradientFilter;
+#if !WEBP_NEON_OMIT_C_CODE
+  WebPFilters[WEBP_FILTER_HORIZONTAL] = HorizontalFilter_C;
+  WebPFilters[WEBP_FILTER_VERTICAL] = VerticalFilter_C;
+  WebPFilters[WEBP_FILTER_GRADIENT] = GradientFilter_C;
+#endif
 
   if (VP8GetCPUInfo != NULL) {
 #if defined(WEBP_USE_SSE2)
@@ -253,11 +259,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8FiltersInit(void) {
       VP8FiltersInitSSE2();
     }
 #endif
-#if defined(WEBP_USE_NEON)
-    if (VP8GetCPUInfo(kNEON)) {
-      VP8FiltersInitNEON();
-    }
-#endif
 #if defined(WEBP_USE_MIPS_DSP_R2)
     if (VP8GetCPUInfo(kMIPSdspR2)) {
       VP8FiltersInitMIPSdspR2();
@@ -269,5 +270,18 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8FiltersInit(void) {
     }
 #endif
   }
-  filters_last_cpuinfo_used = VP8GetCPUInfo;
+
+#if defined(WEBP_USE_NEON)
+  if (WEBP_NEON_OMIT_C_CODE ||
+      (VP8GetCPUInfo != NULL && VP8GetCPUInfo(kNEON))) {
+    VP8FiltersInitNEON();
+  }
+#endif
+
+  assert(WebPUnfilters[WEBP_FILTER_HORIZONTAL] != NULL);
+  assert(WebPUnfilters[WEBP_FILTER_VERTICAL] != NULL);
+  assert(WebPUnfilters[WEBP_FILTER_GRADIENT] != NULL);
+  assert(WebPFilters[WEBP_FILTER_HORIZONTAL] != NULL);
+  assert(WebPFilters[WEBP_FILTER_VERTICAL] != NULL);
+  assert(WebPFilters[WEBP_FILTER_GRADIENT] != NULL);
 }
diff --git a/media/libwebp/dsp/filters_sse2.c b/media/libwebp/dsp/filters_sse2.c
index 67f77999e6..2cc9bb9766 100644
--- a/media/libwebp/dsp/filters_sse2.c
+++ b/media/libwebp/dsp/filters_sse2.c
@@ -11,7 +11,7 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#include "./dsp.h"
+#include "../dsp/dsp.h"
 
 #if defined(WEBP_USE_SSE2)
 
@@ -24,16 +24,16 @@
 // Helpful macro.
 
 # define SANITY_CHECK(in, out)                                                 \
-  assert(in != NULL);                                                          \
-  assert(out != NULL);                                                         \
+  assert((in) != NULL);                                                        \
+  assert((out) != NULL);                                                       \
   assert(width > 0);                                                           \
   assert(height > 0);                                                          \
   assert(stride >= width);                                                     \
   assert(row >= 0 && num_rows > 0 && row + num_rows <= height);                \
   (void)height;  // Silence unused warning.
 
-static void PredictLineTop(const uint8_t* src, const uint8_t* pred,
-                           uint8_t* dst, int length) {
+static void PredictLineTop_SSE2(const uint8_t* src, const uint8_t* pred,
+                                uint8_t* dst, int length) {
   int i;
   const int max_pos = length & ~31;
   assert(length >= 0);
@@ -51,7 +51,7 @@ static void PredictLineTop(const uint8_t* src, const uint8_t* pred,
 }
 
 // Special case for left-based prediction (when preds==dst-1 or preds==src-1).
-static void PredictLineLeft(const uint8_t* src, uint8_t* dst, int length) {
+static void PredictLineLeft_SSE2(const uint8_t* src, uint8_t* dst, int length) {
   int i;
   const int max_pos = length & ~31;
   assert(length >= 0);
@@ -71,10 +71,11 @@ static void PredictLineLeft(const uint8_t* src, uint8_t* dst, int length) {
 //------------------------------------------------------------------------------
 // Horizontal filter.
 
-static WEBP_INLINE void DoHorizontalFilter(const uint8_t* in,
-                                           int width, int height, int stride,
-                                           int row, int num_rows,
-                                           uint8_t* out) {
+static WEBP_INLINE void DoHorizontalFilter_SSE2(const uint8_t* in,
+                                                int width, int height,
+                                                int stride,
+                                                int row, int num_rows,
+                                                uint8_t* out) {
   const size_t start_offset = row * stride;
   const int last_row = row + num_rows;
   SANITY_CHECK(in, out);
@@ -84,7 +85,7 @@ static WEBP_INLINE void DoHorizontalFilter(const uint8_t* in,
   if (row == 0) {
     // Leftmost pixel is the same as input for topmost scanline.
     out[0] = in[0];
-    PredictLineLeft(in + 1, out + 1, width - 1);
+    PredictLineLeft_SSE2(in + 1, out + 1, width - 1);
     row = 1;
     in += stride;
     out += stride;
@@ -94,7 +95,7 @@ static WEBP_INLINE void DoHorizontalFilter(const uint8_t* in,
   while (row < last_row) {
     // Leftmost pixel is predicted from above.
     out[0] = in[0] - in[-stride];
-    PredictLineLeft(in + 1, out + 1, width - 1);
+    PredictLineLeft_SSE2(in + 1, out + 1, width - 1);
     ++row;
     in += stride;
     out += stride;
@@ -104,9 +105,10 @@ static WEBP_INLINE void DoHorizontalFilter(const uint8_t* in,
 //------------------------------------------------------------------------------
 // Vertical filter.
 
-static WEBP_INLINE void DoVerticalFilter(const uint8_t* in,
-                                         int width, int height, int stride,
-                                         int row, int num_rows, uint8_t* out) {
+static WEBP_INLINE void DoVerticalFilter_SSE2(const uint8_t* in,
+                                              int width, int height, int stride,
+                                              int row, int num_rows,
+                                              uint8_t* out) {
   const size_t start_offset = row * stride;
   const int last_row = row + num_rows;
   SANITY_CHECK(in, out);
@@ -117,7 +119,7 @@ static WEBP_INLINE void DoVerticalFilter(const uint8_t* in,
     // Very first top-left pixel is copied.
     out[0] = in[0];
     // Rest of top scan-line is left-predicted.
-    PredictLineLeft(in + 1, out + 1, width - 1);
+    PredictLineLeft_SSE2(in + 1, out + 1, width - 1);
     row = 1;
     in += stride;
     out += stride;
@@ -125,7 +127,7 @@ static WEBP_INLINE void DoVerticalFilter(const uint8_t* in,
 
   // Filter line-by-line.
   while (row < last_row) {
-    PredictLineTop(in, in - stride, out, width);
+    PredictLineTop_SSE2(in, in - stride, out, width);
     ++row;
     in += stride;
     out += stride;
@@ -135,14 +137,14 @@ static WEBP_INLINE void DoVerticalFilter(const uint8_t* in,
 //------------------------------------------------------------------------------
 // Gradient filter.
 
-static WEBP_INLINE int GradientPredictorC(uint8_t a, uint8_t b, uint8_t c) {
+static WEBP_INLINE int GradientPredictor_SSE2(uint8_t a, uint8_t b, uint8_t c) {
   const int g = a + b - c;
   return ((g & ~0xff) == 0) ? g : (g < 0) ? 0 : 255;  // clip to 8bit
 }
 
-static void GradientPredictDirect(const uint8_t* const row,
-                                  const uint8_t* const top,
-                                  uint8_t* const out, int length) {
+static void GradientPredictDirect_SSE2(const uint8_t* const row,
+                                       const uint8_t* const top,
+                                       uint8_t* const out, int length) {
   const int max_pos = length & ~7;
   int i;
   const __m128i zero = _mm_setzero_si128();
@@ -161,14 +163,14 @@ static void GradientPredictDirect(const uint8_t* const row,
     _mm_storel_epi64((__m128i*)(out + i), H);
   }
   for (; i < length; ++i) {
-    out[i] = row[i] - GradientPredictorC(row[i - 1], top[i], top[i - 1]);
+    out[i] = row[i] - GradientPredictor_SSE2(row[i - 1], top[i], top[i - 1]);
   }
 }
 
-static WEBP_INLINE void DoGradientFilter(const uint8_t* in,
-                                         int width, int height, int stride,
-                                         int row, int num_rows,
-                                         uint8_t* out) {
+static WEBP_INLINE void DoGradientFilter_SSE2(const uint8_t* in,
+                                              int width, int height, int stride,
+                                              int row, int num_rows,
+                                              uint8_t* out) {
   const size_t start_offset = row * stride;
   const int last_row = row + num_rows;
   SANITY_CHECK(in, out);
@@ -178,7 +180,7 @@ static WEBP_INLINE void DoGradientFilter(const uint8_t* in,
   // left prediction for top scan-line
   if (row == 0) {
     out[0] = in[0];
-    PredictLineLeft(in + 1, out + 1, width - 1);
+    PredictLineLeft_SSE2(in + 1, out + 1, width - 1);
     row = 1;
     in += stride;
     out += stride;
@@ -187,7 +189,7 @@ static WEBP_INLINE void DoGradientFilter(const uint8_t* in,
   // Filter line-by-line.
   while (row < last_row) {
     out[0] = in[0] - in[-stride];
-    GradientPredictDirect(in + 1, in + 1 - stride, out + 1, width - 1);
+    GradientPredictDirect_SSE2(in + 1, in + 1 - stride, out + 1, width - 1);
     ++row;
     in += stride;
     out += stride;
@@ -198,26 +200,27 @@ static WEBP_INLINE void DoGradientFilter(const uint8_t* in,
 
 //------------------------------------------------------------------------------
 
-static void HorizontalFilter(const uint8_t* data, int width, int height,
-                             int stride, uint8_t* filtered_data) {
-  DoHorizontalFilter(data, width, height, stride, 0, height, filtered_data);
+static void HorizontalFilter_SSE2(const uint8_t* data, int width, int height,
+                                  int stride, uint8_t* filtered_data) {
+  DoHorizontalFilter_SSE2(data, width, height, stride, 0, height,
+                          filtered_data);
 }
 
-static void VerticalFilter(const uint8_t* data, int width, int height,
-                           int stride, uint8_t* filtered_data) {
-  DoVerticalFilter(data, width, height, stride, 0, height, filtered_data);
+static void VerticalFilter_SSE2(const uint8_t* data, int width, int height,
+                                int stride, uint8_t* filtered_data) {
+  DoVerticalFilter_SSE2(data, width, height, stride, 0, height, filtered_data);
 }
 
-static void GradientFilter(const uint8_t* data, int width, int height,
-                           int stride, uint8_t* filtered_data) {
-  DoGradientFilter(data, width, height, stride, 0, height, filtered_data);
+static void GradientFilter_SSE2(const uint8_t* data, int width, int height,
+                                int stride, uint8_t* filtered_data) {
+  DoGradientFilter_SSE2(data, width, height, stride, 0, height, filtered_data);
 }
 
 //------------------------------------------------------------------------------
 // Inverse transforms
 
-static void HorizontalUnfilter(const uint8_t* prev, const uint8_t* in,
-                               uint8_t* out, int width) {
+static void HorizontalUnfilter_SSE2(const uint8_t* prev, const uint8_t* in,
+                                    uint8_t* out, int width) {
   int i;
   __m128i last;
   out[0] = in[0] + (prev == NULL ? 0 : prev[0]);
@@ -238,10 +241,10 @@ static void HorizontalUnfilter(const uint8_t* prev, const uint8_t* in,
   for (; i < width; ++i) out[i] = in[i] + out[i - 1];
 }
 
-static void VerticalUnfilter(const uint8_t* prev, const uint8_t* in,
-                             uint8_t* out, int width) {
+static void VerticalUnfilter_SSE2(const uint8_t* prev, const uint8_t* in,
+                                  uint8_t* out, int width) {
   if (prev == NULL) {
-    HorizontalUnfilter(NULL, in, out, width);
+    HorizontalUnfilter_SSE2(NULL, in, out, width);
   } else {
     int i;
     const int max_pos = width & ~31;
@@ -260,9 +263,9 @@ static void VerticalUnfilter(const uint8_t* prev, const uint8_t* in,
   }
 }
 
-static void GradientPredictInverse(const uint8_t* const in,
-                                   const uint8_t* const top,
-                                   uint8_t* const row, int length) {
+static void GradientPredictInverse_SSE2(const uint8_t* const in,
+                                        const uint8_t* const top,
+                                        uint8_t* const row, int length) {
   if (length > 0) {
     int i;
     const int max_pos = length & ~7;
@@ -293,18 +296,18 @@ static void GradientPredictInverse(const uint8_t* const in,
       _mm_storel_epi64((__m128i*)&row[i], out);
     }
     for (; i < length; ++i) {
-      row[i] = in[i] + GradientPredictorC(row[i - 1], top[i], top[i - 1]);
+      row[i] = in[i] + GradientPredictor_SSE2(row[i - 1], top[i], top[i - 1]);
     }
   }
 }
 
-static void GradientUnfilter(const uint8_t* prev, const uint8_t* in,
-                             uint8_t* out, int width) {
+static void GradientUnfilter_SSE2(const uint8_t* prev, const uint8_t* in,
+                                  uint8_t* out, int width) {
   if (prev == NULL) {
-    HorizontalUnfilter(NULL, in, out, width);
+    HorizontalUnfilter_SSE2(NULL, in, out, width);
   } else {
     out[0] = in[0] + prev[0];  // predict from above
-    GradientPredictInverse(in + 1, prev + 1, out + 1, width - 1);
+    GradientPredictInverse_SSE2(in + 1, prev + 1, out + 1, width - 1);
   }
 }
 
@@ -314,13 +317,13 @@ static void GradientUnfilter(const uint8_t* prev, const uint8_t* in,
 extern void VP8FiltersInitSSE2(void);
 
 WEBP_TSAN_IGNORE_FUNCTION void VP8FiltersInitSSE2(void) {
-  WebPUnfilters[WEBP_FILTER_HORIZONTAL] = HorizontalUnfilter;
-  WebPUnfilters[WEBP_FILTER_VERTICAL] = VerticalUnfilter;
-  WebPUnfilters[WEBP_FILTER_GRADIENT] = GradientUnfilter;
+  WebPUnfilters[WEBP_FILTER_HORIZONTAL] = HorizontalUnfilter_SSE2;
+  WebPUnfilters[WEBP_FILTER_VERTICAL] = VerticalUnfilter_SSE2;
+  WebPUnfilters[WEBP_FILTER_GRADIENT] = GradientUnfilter_SSE2;
 
-  WebPFilters[WEBP_FILTER_HORIZONTAL] = HorizontalFilter;
-  WebPFilters[WEBP_FILTER_VERTICAL] = VerticalFilter;
-  WebPFilters[WEBP_FILTER_GRADIENT] = GradientFilter;
+  WebPFilters[WEBP_FILTER_HORIZONTAL] = HorizontalFilter_SSE2;
+  WebPFilters[WEBP_FILTER_VERTICAL] = VerticalFilter_SSE2;
+  WebPFilters[WEBP_FILTER_GRADIENT] = GradientFilter_SSE2;
 }
 
 #else  // !WEBP_USE_SSE2
diff --git a/media/libwebp/dsp/lossless.c b/media/libwebp/dsp/lossless.c
index 20d18f6ecd..93ccecdfd7 100644
--- a/media/libwebp/dsp/lossless.c
+++ b/media/libwebp/dsp/lossless.c
@@ -13,14 +13,15 @@
 //          Jyrki Alakuijala (jyrki@google.com)
 //          Urvang Joshi (urvang@google.com)
 
-#include "./dsp.h"
+#include "../dsp/dsp.h"
 
+#include <assert.h>
 #include <math.h>
 #include <stdlib.h>
 #include "../dec/vp8li_dec.h"
 #include "../utils/endian_inl_utils.h"
-#include "./lossless.h"
-#include "./lossless_common.h"
+#include "../dsp/lossless.h"
+#include "../dsp/lossless_common.h"
 
 #define MAX_DIFF_COST (1e30f)
 
@@ -80,8 +81,9 @@ static WEBP_INLINE uint32_t ClampedAddSubtractHalf(uint32_t c0, uint32_t c1,
   return ((uint32_t)a << 24) | (r << 16) | (g << 8) | b;
 }
 
-// gcc-4.9 on ARM generates incorrect code in Select() when Sub3() is inlined.
-#if defined(__arm__) && LOCAL_GCC_VERSION == 0x409
+// gcc <= 4.9 on ARM generates incorrect code in Select() when Sub3() is
+// inlined.
+#if defined(__arm__) && LOCAL_GCC_VERSION <= 0x409
 # define LOCAL_INLINE __attribute__ ((noinline))
 #else
 # define LOCAL_INLINE WEBP_INLINE
@@ -107,69 +109,69 @@ static WEBP_INLINE uint32_t Select(uint32_t a, uint32_t b, uint32_t c) {
 //------------------------------------------------------------------------------
 // Predictors
 
-static uint32_t Predictor0(uint32_t left, const uint32_t* const top) {
+static uint32_t Predictor0_C(uint32_t left, const uint32_t* const top) {
   (void)top;
   (void)left;
   return ARGB_BLACK;
 }
-static uint32_t Predictor1(uint32_t left, const uint32_t* const top) {
+static uint32_t Predictor1_C(uint32_t left, const uint32_t* const top) {
   (void)top;
   return left;
 }
-static uint32_t Predictor2(uint32_t left, const uint32_t* const top) {
+static uint32_t Predictor2_C(uint32_t left, const uint32_t* const top) {
   (void)left;
   return top[0];
 }
-static uint32_t Predictor3(uint32_t left, const uint32_t* const top) {
+static uint32_t Predictor3_C(uint32_t left, const uint32_t* const top) {
   (void)left;
   return top[1];
 }
-static uint32_t Predictor4(uint32_t left, const uint32_t* const top) {
+static uint32_t Predictor4_C(uint32_t left, const uint32_t* const top) {
   (void)left;
   return top[-1];
 }
-static uint32_t Predictor5(uint32_t left, const uint32_t* const top) {
+static uint32_t Predictor5_C(uint32_t left, const uint32_t* const top) {
   const uint32_t pred = Average3(left, top[0], top[1]);
   return pred;
 }
-static uint32_t Predictor6(uint32_t left, const uint32_t* const top) {
+static uint32_t Predictor6_C(uint32_t left, const uint32_t* const top) {
   const uint32_t pred = Average2(left, top[-1]);
   return pred;
 }
-static uint32_t Predictor7(uint32_t left, const uint32_t* const top) {
+static uint32_t Predictor7_C(uint32_t left, const uint32_t* const top) {
   const uint32_t pred = Average2(left, top[0]);
   return pred;
 }
-static uint32_t Predictor8(uint32_t left, const uint32_t* const top) {
+static uint32_t Predictor8_C(uint32_t left, const uint32_t* const top) {
   const uint32_t pred = Average2(top[-1], top[0]);
   (void)left;
   return pred;
 }
-static uint32_t Predictor9(uint32_t left, const uint32_t* const top) {
+static uint32_t Predictor9_C(uint32_t left, const uint32_t* const top) {
   const uint32_t pred = Average2(top[0], top[1]);
   (void)left;
   return pred;
 }
-static uint32_t Predictor10(uint32_t left, const uint32_t* const top) {
+static uint32_t Predictor10_C(uint32_t left, const uint32_t* const top) {
   const uint32_t pred = Average4(left, top[-1], top[0], top[1]);
   return pred;
 }
-static uint32_t Predictor11(uint32_t left, const uint32_t* const top) {
+static uint32_t Predictor11_C(uint32_t left, const uint32_t* const top) {
   const uint32_t pred = Select(top[0], left, top[-1]);
   return pred;
 }
-static uint32_t Predictor12(uint32_t left, const uint32_t* const top) {
+static uint32_t Predictor12_C(uint32_t left, const uint32_t* const top) {
   const uint32_t pred = ClampedAddSubtractFull(left, top[0], top[-1]);
   return pred;
 }
-static uint32_t Predictor13(uint32_t left, const uint32_t* const top) {
+static uint32_t Predictor13_C(uint32_t left, const uint32_t* const top) {
   const uint32_t pred = ClampedAddSubtractHalf(left, top[0], top[-1]);
   return pred;
 }
 
-GENERATE_PREDICTOR_ADD(Predictor0, PredictorAdd0)
-static void PredictorAdd1(const uint32_t* in, const uint32_t* upper,
-                          int num_pixels, uint32_t* out) {
+GENERATE_PREDICTOR_ADD(Predictor0_C, PredictorAdd0_C)
+static void PredictorAdd1_C(const uint32_t* in, const uint32_t* upper,
+                            int num_pixels, uint32_t* out) {
   int i;
   uint32_t left = out[-1];
   for (i = 0; i < num_pixels; ++i) {
@@ -177,29 +179,29 @@ static void PredictorAdd1(const uint32_t* in, const uint32_t* upper,
   }
   (void)upper;
 }
-GENERATE_PREDICTOR_ADD(Predictor2, PredictorAdd2)
-GENERATE_PREDICTOR_ADD(Predictor3, PredictorAdd3)
-GENERATE_PREDICTOR_ADD(Predictor4, PredictorAdd4)
-GENERATE_PREDICTOR_ADD(Predictor5, PredictorAdd5)
-GENERATE_PREDICTOR_ADD(Predictor6, PredictorAdd6)
-GENERATE_PREDICTOR_ADD(Predictor7, PredictorAdd7)
-GENERATE_PREDICTOR_ADD(Predictor8, PredictorAdd8)
-GENERATE_PREDICTOR_ADD(Predictor9, PredictorAdd9)
-GENERATE_PREDICTOR_ADD(Predictor10, PredictorAdd10)
-GENERATE_PREDICTOR_ADD(Predictor11, PredictorAdd11)
-GENERATE_PREDICTOR_ADD(Predictor12, PredictorAdd12)
-GENERATE_PREDICTOR_ADD(Predictor13, PredictorAdd13)
+GENERATE_PREDICTOR_ADD(Predictor2_C, PredictorAdd2_C)
+GENERATE_PREDICTOR_ADD(Predictor3_C, PredictorAdd3_C)
+GENERATE_PREDICTOR_ADD(Predictor4_C, PredictorAdd4_C)
+GENERATE_PREDICTOR_ADD(Predictor5_C, PredictorAdd5_C)
+GENERATE_PREDICTOR_ADD(Predictor6_C, PredictorAdd6_C)
+GENERATE_PREDICTOR_ADD(Predictor7_C, PredictorAdd7_C)
+GENERATE_PREDICTOR_ADD(Predictor8_C, PredictorAdd8_C)
+GENERATE_PREDICTOR_ADD(Predictor9_C, PredictorAdd9_C)
+GENERATE_PREDICTOR_ADD(Predictor10_C, PredictorAdd10_C)
+GENERATE_PREDICTOR_ADD(Predictor11_C, PredictorAdd11_C)
+GENERATE_PREDICTOR_ADD(Predictor12_C, PredictorAdd12_C)
+GENERATE_PREDICTOR_ADD(Predictor13_C, PredictorAdd13_C)
 
 //------------------------------------------------------------------------------
 
 // Inverse prediction.
-static void PredictorInverseTransform(const VP8LTransform* const transform,
-                                      int y_start, int y_end,
-                                      const uint32_t* in, uint32_t* out) {
+static void PredictorInverseTransform_C(const VP8LTransform* const transform,
+                                        int y_start, int y_end,
+                                        const uint32_t* in, uint32_t* out) {
   const int width = transform->xsize_;
   if (y_start == 0) {  // First Row follows the L (mode=1) mode.
-    PredictorAdd0(in, NULL, 1, out);
-    PredictorAdd1(in + 1, NULL, width - 1, out + 1);
+    PredictorAdd0_C(in, NULL, 1, out);
+    PredictorAdd1_C(in + 1, NULL, width - 1, out + 1);
     in += width;
     out += width;
     ++y_start;
@@ -217,7 +219,7 @@ static void PredictorInverseTransform(const VP8LTransform* const transform,
       const uint32_t* pred_mode_src = pred_mode_base;
       int x = 1;
       // First pixel follows the T (mode=2) mode.
-      PredictorAdd2(in, out - width, 1, out);
+      PredictorAdd2_C(in, out - width, 1, out);
       // .. the rest:
       while (x < width) {
         const VP8LPredictorAddSubFunc pred_func =
@@ -272,8 +274,8 @@ void VP8LTransformColorInverse_C(const VP8LMultipliers* const m,
     const uint32_t argb = src[i];
     const uint32_t green = argb >> 8;
     const uint32_t red = argb >> 16;
-    int new_red = red;
-    int new_blue = argb;
+    int new_red = red & 0xff;
+    int new_blue = argb & 0xff;
     new_red += ColorTransformDelta(m->green_to_red_, green);
     new_red &= 0xff;
     new_blue += ColorTransformDelta(m->green_to_blue_, green);
@@ -284,9 +286,9 @@ void VP8LTransformColorInverse_C(const VP8LMultipliers* const m,
 }
 
 // Color space inverse transform.
-static void ColorSpaceInverseTransform(const VP8LTransform* const transform,
-                                       int y_start, int y_end,
-                                       const uint32_t* src, uint32_t* dst) {
+static void ColorSpaceInverseTransform_C(const VP8LTransform* const transform,
+                                         int y_start, int y_end,
+                                         const uint32_t* src, uint32_t* dst) {
   const int width = transform->xsize_;
   const int tile_width = 1 << transform->bits_;
   const int mask = tile_width - 1;
@@ -362,10 +364,10 @@ STATIC_DECL void FUNC_NAME(const VP8LTransform* const transform,               \
   }                                                                            \
 }
 
-COLOR_INDEX_INVERSE(ColorIndexInverseTransform, MapARGB, static, uint32_t, 32b,
-                    VP8GetARGBIndex, VP8GetARGBValue)
-COLOR_INDEX_INVERSE(VP8LColorIndexInverseTransformAlpha, MapAlpha, , uint8_t,
-                    8b, VP8GetAlphaIndex, VP8GetAlphaValue)
+COLOR_INDEX_INVERSE(ColorIndexInverseTransform_C, MapARGB_C, static,
+                    uint32_t, 32b, VP8GetARGBIndex, VP8GetARGBValue)
+COLOR_INDEX_INVERSE(VP8LColorIndexInverseTransformAlpha, MapAlpha_C, ,
+                    uint8_t, 8b, VP8GetAlphaIndex, VP8GetAlphaValue)
 
 #undef COLOR_INDEX_INVERSE
 
@@ -380,7 +382,7 @@ void VP8LInverseTransform(const VP8LTransform* const transform,
       VP8LAddGreenToBlueAndRed(in, (row_end - row_start) * width, out);
       break;
     case PREDICTOR_TRANSFORM:
-      PredictorInverseTransform(transform, row_start, row_end, in, out);
+      PredictorInverseTransform_C(transform, row_start, row_end, in, out);
       if (row_end != transform->ysize_) {
         // The last predicted row in this iteration will be the top-pred row
         // for the first row in next iteration.
@@ -389,7 +391,7 @@ void VP8LInverseTransform(const VP8LTransform* const transform,
       }
       break;
     case CROSS_COLOR_TRANSFORM:
-      ColorSpaceInverseTransform(transform, row_start, row_end, in, out);
+      ColorSpaceInverseTransform_C(transform, row_start, row_end, in, out);
       break;
     case COLOR_INDEXING_TRANSFORM:
       if (in == out && transform->bits_ > 0) {
@@ -403,9 +405,9 @@ void VP8LInverseTransform(const VP8LTransform* const transform,
             VP8LSubSampleSize(transform->xsize_, transform->bits_);
         uint32_t* const src = out + out_stride - in_stride;
         memmove(src, out, in_stride * sizeof(*src));
-        ColorIndexInverseTransform(transform, row_start, row_end, src, out);
+        ColorIndexInverseTransform_C(transform, row_start, row_end, src, out);
       } else {
-        ColorIndexInverseTransform(transform, row_start, row_end, in, out);
+        ColorIndexInverseTransform_C(transform, row_start, row_end, in, out);
       }
       break;
   }
@@ -452,7 +454,7 @@ void VP8LConvertBGRAToRGBA4444_C(const uint32_t* src,
     const uint32_t argb = *src++;
     const uint8_t rg = ((argb >> 16) & 0xf0) | ((argb >> 12) & 0xf);
     const uint8_t ba = ((argb >>  0) & 0xf0) | ((argb >> 28) & 0xf);
-#ifdef WEBP_SWAP_16BIT_CSP
+#if (WEBP_SWAP_16BIT_CSP == 1)
     *dst++ = ba;
     *dst++ = rg;
 #else
@@ -469,7 +471,7 @@ void VP8LConvertBGRAToRGB565_C(const uint32_t* src,
     const uint32_t argb = *src++;
     const uint8_t rg = ((argb >> 16) & 0xf8) | ((argb >> 13) & 0x7);
     const uint8_t gb = ((argb >>  5) & 0xe0) | ((argb >>  3) & 0x1f);
-#ifdef WEBP_SWAP_16BIT_CSP
+#if (WEBP_SWAP_16BIT_CSP == 1)
     *dst++ = gb;
     *dst++ = rg;
 #else
@@ -496,22 +498,7 @@ static void CopyOrSwap(const uint32_t* src, int num_pixels, uint8_t* dst,
     const uint32_t* const src_end = src + num_pixels;
     while (src < src_end) {
       const uint32_t argb = *src++;
-
-#if !defined(WORDS_BIGENDIAN)
-#if !defined(WEBP_REFERENCE_IMPLEMENTATION)
       WebPUint32ToMem(dst, BSwap32(argb));
-#else  // WEBP_REFERENCE_IMPLEMENTATION
-      dst[0] = (argb >> 24) & 0xff;
-      dst[1] = (argb >> 16) & 0xff;
-      dst[2] = (argb >>  8) & 0xff;
-      dst[3] = (argb >>  0) & 0xff;
-#endif
-#else  // WORDS_BIGENDIAN
-      dst[0] = (argb >>  0) & 0xff;
-      dst[1] = (argb >>  8) & 0xff;
-      dst[2] = (argb >> 16) & 0xff;
-      dst[3] = (argb >> 24) & 0xff;
-#endif
       dst += sizeof(argb);
     }
   } else {
@@ -590,48 +577,46 @@ extern void VP8LDspInitNEON(void);
 extern void VP8LDspInitMIPSdspR2(void);
 extern void VP8LDspInitMSA(void);
 
-static volatile VP8CPUInfo lossless_last_cpuinfo_used =
-    (VP8CPUInfo)&lossless_last_cpuinfo_used;
-
-#define COPY_PREDICTOR_ARRAY(IN, OUT) do {              \
-  (OUT)[0] = IN##0;                                     \
-  (OUT)[1] = IN##1;                                     \
-  (OUT)[2] = IN##2;                                     \
-  (OUT)[3] = IN##3;                                     \
-  (OUT)[4] = IN##4;                                     \
-  (OUT)[5] = IN##5;                                     \
-  (OUT)[6] = IN##6;                                     \
-  (OUT)[7] = IN##7;                                     \
-  (OUT)[8] = IN##8;                                     \
-  (OUT)[9] = IN##9;                                     \
-  (OUT)[10] = IN##10;                                   \
-  (OUT)[11] = IN##11;                                   \
-  (OUT)[12] = IN##12;                                   \
-  (OUT)[13] = IN##13;                                   \
-  (OUT)[14] = IN##0; /* <- padding security sentinels*/ \
-  (OUT)[15] = IN##0;                                    \
+#define COPY_PREDICTOR_ARRAY(IN, OUT) do {                \
+  (OUT)[0] = IN##0_C;                                     \
+  (OUT)[1] = IN##1_C;                                     \
+  (OUT)[2] = IN##2_C;                                     \
+  (OUT)[3] = IN##3_C;                                     \
+  (OUT)[4] = IN##4_C;                                     \
+  (OUT)[5] = IN##5_C;                                     \
+  (OUT)[6] = IN##6_C;                                     \
+  (OUT)[7] = IN##7_C;                                     \
+  (OUT)[8] = IN##8_C;                                     \
+  (OUT)[9] = IN##9_C;                                     \
+  (OUT)[10] = IN##10_C;                                   \
+  (OUT)[11] = IN##11_C;                                   \
+  (OUT)[12] = IN##12_C;                                   \
+  (OUT)[13] = IN##13_C;                                   \
+  (OUT)[14] = IN##0_C; /* <- padding security sentinels*/ \
+  (OUT)[15] = IN##0_C;                                    \
 } while (0);
 
-WEBP_TSAN_IGNORE_FUNCTION void VP8LDspInit(void) {
-  if (lossless_last_cpuinfo_used == VP8GetCPUInfo) return;
-
+WEBP_DSP_INIT_FUNC(VP8LDspInit) {
   COPY_PREDICTOR_ARRAY(Predictor, VP8LPredictors)
   COPY_PREDICTOR_ARRAY(Predictor, VP8LPredictors_C)
   COPY_PREDICTOR_ARRAY(PredictorAdd, VP8LPredictorsAdd)
   COPY_PREDICTOR_ARRAY(PredictorAdd, VP8LPredictorsAdd_C)
 
+#if !WEBP_NEON_OMIT_C_CODE
   VP8LAddGreenToBlueAndRed = VP8LAddGreenToBlueAndRed_C;
 
   VP8LTransformColorInverse = VP8LTransformColorInverse_C;
 
-  VP8LConvertBGRAToRGB = VP8LConvertBGRAToRGB_C;
   VP8LConvertBGRAToRGBA = VP8LConvertBGRAToRGBA_C;
+  VP8LConvertBGRAToRGB = VP8LConvertBGRAToRGB_C;
+  VP8LConvertBGRAToBGR = VP8LConvertBGRAToBGR_C;
+#endif
+
   VP8LConvertBGRAToRGBA4444 = VP8LConvertBGRAToRGBA4444_C;
   VP8LConvertBGRAToRGB565 = VP8LConvertBGRAToRGB565_C;
-  VP8LConvertBGRAToBGR = VP8LConvertBGRAToBGR_C;
 
-  VP8LMapColor32b = MapARGB;
-  VP8LMapColor8b = MapAlpha;
+  VP8LMapColor32b = MapARGB_C;
+  VP8LMapColor8b = MapAlpha_C;
 
   // If defined, use CPUInfo() to overwrite some pointers with faster versions.
   if (VP8GetCPUInfo != NULL) {
@@ -640,11 +625,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8LDspInit(void) {
       VP8LDspInitSSE2();
     }
 #endif
-#if defined(WEBP_USE_NEON)
-    if (VP8GetCPUInfo(kNEON)) {
-      VP8LDspInitNEON();
-    }
-#endif
 #if defined(WEBP_USE_MIPS_DSP_R2)
     if (VP8GetCPUInfo(kMIPSdspR2)) {
       VP8LDspInitMIPSdspR2();
@@ -656,7 +636,23 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8LDspInit(void) {
     }
 #endif
   }
-  lossless_last_cpuinfo_used = VP8GetCPUInfo;
+
+#if defined(WEBP_USE_NEON)
+  if (WEBP_NEON_OMIT_C_CODE ||
+      (VP8GetCPUInfo != NULL && VP8GetCPUInfo(kNEON))) {
+    VP8LDspInitNEON();
+  }
+#endif
+
+  assert(VP8LAddGreenToBlueAndRed != NULL);
+  assert(VP8LTransformColorInverse != NULL);
+  assert(VP8LConvertBGRAToRGBA != NULL);
+  assert(VP8LConvertBGRAToRGB != NULL);
+  assert(VP8LConvertBGRAToBGR != NULL);
+  assert(VP8LConvertBGRAToRGBA4444 != NULL);
+  assert(VP8LConvertBGRAToRGB565 != NULL);
+  assert(VP8LMapColor32b != NULL);
+  assert(VP8LMapColor8b != NULL);
 }
 #undef COPY_PREDICTOR_ARRAY
 
diff --git a/media/libwebp/dsp/lossless.h b/media/libwebp/dsp/lossless.h
index 352a54e509..4a1d1e0ddc 100644
--- a/media/libwebp/dsp/lossless.h
+++ b/media/libwebp/dsp/lossless.h
@@ -25,10 +25,6 @@
 extern "C" {
 #endif
 
-#ifdef WEBP_EXPERIMENTAL_FEATURES
-#include "../enc/delta_palettization_enc.h"
-#endif  // WEBP_EXPERIMENTAL_FEATURES
-
 //------------------------------------------------------------------------------
 // Decoding
 
@@ -124,7 +120,7 @@ void VP8LDspInit(void);
 typedef void (*VP8LProcessEncBlueAndRedFunc)(uint32_t* dst, int num_pixels);
 extern VP8LProcessEncBlueAndRedFunc VP8LSubtractGreenFromBlueAndRed;
 typedef void (*VP8LTransformColorFunc)(const VP8LMultipliers* const m,
-                                       uint32_t* const dst, int num_pixels);
+                                       uint32_t* dst, int num_pixels);
 extern VP8LTransformColorFunc VP8LTransformColor;
 typedef void (*VP8LCollectColorBlueTransformsFunc)(
     const uint32_t* argb, int stride,
diff --git a/media/libwebp/dsp/lossless_common.h b/media/libwebp/dsp/lossless_common.h
index c40f711208..dd2e4f247e 100644
--- a/media/libwebp/dsp/lossless_common.h
+++ b/media/libwebp/dsp/lossless_common.h
@@ -93,14 +93,6 @@ static WEBP_INLINE float VP8LFastSLog2(uint32_t v) {
 // -----------------------------------------------------------------------------
 // PrefixEncode()
 
-static WEBP_INLINE int VP8LBitsLog2Ceiling(uint32_t n) {
-  const int log_floor = BitsLog2Floor(n);
-  if (n == (n & ~(n - 1))) {  // zero or a power of two.
-    return log_floor;
-  }
-  return log_floor + 1;
-}
-
 // Splitting of distance and length codes into prefixes and
 // extra bits. The prefixes are encoded with an entropy code
 // while the extra bits are stored just as normal bits.
diff --git a/media/libwebp/dsp/lossless_neon.c b/media/libwebp/dsp/lossless_neon.c
index 1145d5fad0..a7bf47f3c4 100644
--- a/media/libwebp/dsp/lossless_neon.c
+++ b/media/libwebp/dsp/lossless_neon.c
@@ -11,14 +11,14 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#include "./dsp.h"
+#include "../dsp/dsp.h"
 
 #if defined(WEBP_USE_NEON)
 
 #include <arm_neon.h>
 
-#include "./lossless.h"
-#include "./neon.h"
+#include "../dsp/lossless.h"
+#include "../dsp/neon.h"
 
 //------------------------------------------------------------------------------
 // Colorspace conversion functions
@@ -26,8 +26,8 @@
 #if !defined(WORK_AROUND_GCC)
 // gcc 4.6.0 had some trouble (NDK-r9) with this code. We only use it for
 // gcc-4.8.x at least.
-static void ConvertBGRAToRGBA(const uint32_t* src,
-                              int num_pixels, uint8_t* dst) {
+static void ConvertBGRAToRGBA_NEON(const uint32_t* src,
+                                   int num_pixels, uint8_t* dst) {
   const uint32_t* const end = src + (num_pixels & ~15);
   for (; src < end; src += 16) {
     uint8x16x4_t pixel = vld4q_u8((uint8_t*)src);
@@ -41,8 +41,8 @@ static void ConvertBGRAToRGBA(const uint32_t* src,
   VP8LConvertBGRAToRGBA_C(src, num_pixels & 15, dst);  // left-overs
 }
 
-static void ConvertBGRAToBGR(const uint32_t* src,
-                             int num_pixels, uint8_t* dst) {
+static void ConvertBGRAToBGR_NEON(const uint32_t* src,
+                                  int num_pixels, uint8_t* dst) {
   const uint32_t* const end = src + (num_pixels & ~15);
   for (; src < end; src += 16) {
     const uint8x16x4_t pixel = vld4q_u8((uint8_t*)src);
@@ -53,8 +53,8 @@ static void ConvertBGRAToBGR(const uint32_t* src,
   VP8LConvertBGRAToBGR_C(src, num_pixels & 15, dst);  // left-overs
 }
 
-static void ConvertBGRAToRGB(const uint32_t* src,
-                             int num_pixels, uint8_t* dst) {
+static void ConvertBGRAToRGB_NEON(const uint32_t* src,
+                                  int num_pixels, uint8_t* dst) {
   const uint32_t* const end = src + (num_pixels & ~15);
   for (; src < end; src += 16) {
     const uint8x16x4_t pixel = vld4q_u8((uint8_t*)src);
@@ -71,8 +71,8 @@ static void ConvertBGRAToRGB(const uint32_t* src,
 
 static const uint8_t kRGBAShuffle[8] = { 2, 1, 0, 3, 6, 5, 4, 7 };
 
-static void ConvertBGRAToRGBA(const uint32_t* src,
-                              int num_pixels, uint8_t* dst) {
+static void ConvertBGRAToRGBA_NEON(const uint32_t* src,
+                                   int num_pixels, uint8_t* dst) {
   const uint32_t* const end = src + (num_pixels & ~1);
   const uint8x8_t shuffle = vld1_u8(kRGBAShuffle);
   for (; src < end; src += 2) {
@@ -89,8 +89,8 @@ static const uint8_t kBGRShuffle[3][8] = {
   { 21, 22, 24, 25, 26, 28, 29, 30 }
 };
 
-static void ConvertBGRAToBGR(const uint32_t* src,
-                             int num_pixels, uint8_t* dst) {
+static void ConvertBGRAToBGR_NEON(const uint32_t* src,
+                                  int num_pixels, uint8_t* dst) {
   const uint32_t* const end = src + (num_pixels & ~7);
   const uint8x8_t shuffle0 = vld1_u8(kBGRShuffle[0]);
   const uint8x8_t shuffle1 = vld1_u8(kBGRShuffle[1]);
@@ -116,8 +116,8 @@ static const uint8_t kRGBShuffle[3][8] = {
   { 21, 20, 26, 25, 24, 30, 29, 28 }
 };
 
-static void ConvertBGRAToRGB(const uint32_t* src,
-                             int num_pixels, uint8_t* dst) {
+static void ConvertBGRAToRGB_NEON(const uint32_t* src,
+                                  int num_pixels, uint8_t* dst) {
   const uint32_t* const end = src + (num_pixels & ~7);
   const uint8x8_t shuffle0 = vld1_u8(kRGBShuffle[0]);
   const uint8x8_t shuffle1 = vld1_u8(kRGBShuffle[1]);
@@ -139,7 +139,6 @@ static void ConvertBGRAToRGB(const uint32_t* src,
 
 #endif   // !WORK_AROUND_GCC
 
-
 //------------------------------------------------------------------------------
 // Predictor Transform
 
@@ -506,8 +505,8 @@ static const uint8_t kGreenShuffle[16] = {
   1, 255, 1, 255, 5, 255, 5, 255, 9, 255, 9, 255, 13, 255, 13, 255
 };
 
-static WEBP_INLINE uint8x16_t DoGreenShuffle(const uint8x16_t argb,
-                                             const uint8x16_t shuffle) {
+static WEBP_INLINE uint8x16_t DoGreenShuffle_NEON(const uint8x16_t argb,
+                                                  const uint8x16_t shuffle) {
   return vcombine_u8(vtbl1q_u8(argb, vget_low_u8(shuffle)),
                      vtbl1q_u8(argb, vget_high_u8(shuffle)));
 }
@@ -515,15 +514,15 @@ static WEBP_INLINE uint8x16_t DoGreenShuffle(const uint8x16_t argb,
 // 255 = byte will be zeroed
 static const uint8_t kGreenShuffle[8] = { 1, 255, 1, 255, 5, 255, 5, 255  };
 
-static WEBP_INLINE uint8x16_t DoGreenShuffle(const uint8x16_t argb,
-                                             const uint8x8_t shuffle) {
+static WEBP_INLINE uint8x16_t DoGreenShuffle_NEON(const uint8x16_t argb,
+                                                  const uint8x8_t shuffle) {
   return vcombine_u8(vtbl1_u8(vget_low_u8(argb), shuffle),
                      vtbl1_u8(vget_high_u8(argb), shuffle));
 }
 #endif  // USE_VTBLQ
 
-static void AddGreenToBlueAndRed(const uint32_t* src, int num_pixels,
-                                 uint32_t* dst) {
+static void AddGreenToBlueAndRed_NEON(const uint32_t* src, int num_pixels,
+                                      uint32_t* dst) {
   const uint32_t* const end = src + (num_pixels & ~3);
 #ifdef USE_VTBLQ
   const uint8x16_t shuffle = vld1q_u8(kGreenShuffle);
@@ -532,7 +531,7 @@ static void AddGreenToBlueAndRed(const uint32_t* src, int num_pixels,
 #endif
   for (; src < end; src += 4, dst += 4) {
     const uint8x16_t argb = vld1q_u8((const uint8_t*)src);
-    const uint8x16_t greens = DoGreenShuffle(argb, shuffle);
+    const uint8x16_t greens = DoGreenShuffle_NEON(argb, shuffle);
     vst1q_u8((uint8_t*)dst, vaddq_u8(argb, greens));
   }
   // fallthrough and finish off with plain-C
@@ -542,9 +541,9 @@ static void AddGreenToBlueAndRed(const uint32_t* src, int num_pixels,
 //------------------------------------------------------------------------------
 // Color Transform
 
-static void TransformColorInverse(const VP8LMultipliers* const m,
-                                  const uint32_t* const src, int num_pixels,
-                                  uint32_t* dst) {
+static void TransformColorInverse_NEON(const VP8LMultipliers* const m,
+                                       const uint32_t* const src,
+                                       int num_pixels, uint32_t* dst) {
 // sign-extended multiplying constants, pre-shifted by 6.
 #define CST(X)  (((int16_t)(m->X << 8)) >> 6)
   const int16_t rb[8] = {
@@ -575,7 +574,7 @@ static void TransformColorInverse(const VP8LMultipliers* const m,
     const uint8x16_t in = vld1q_u8((const uint8_t*)(src + i));
     const uint32x4_t a0g0 = vandq_u32(vreinterpretq_u32_u8(in), mask_ag);
     // 0 g 0 g
-    const uint8x16_t greens = DoGreenShuffle(in, shuffle);
+    const uint8x16_t greens = DoGreenShuffle_NEON(in, shuffle);
     // x dr  x db1
     const int16x8_t A = vqdmulhq_s16(vreinterpretq_s16_u8(greens), mults_rb);
     // x r'  x   b'
@@ -627,12 +626,12 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8LDspInitNEON(void) {
   VP8LPredictorsAdd[12] = PredictorAdd12_NEON;
   VP8LPredictorsAdd[13] = PredictorAdd13_NEON;
 
-  VP8LConvertBGRAToRGBA = ConvertBGRAToRGBA;
-  VP8LConvertBGRAToBGR = ConvertBGRAToBGR;
-  VP8LConvertBGRAToRGB = ConvertBGRAToRGB;
+  VP8LConvertBGRAToRGBA = ConvertBGRAToRGBA_NEON;
+  VP8LConvertBGRAToBGR = ConvertBGRAToBGR_NEON;
+  VP8LConvertBGRAToRGB = ConvertBGRAToRGB_NEON;
 
-  VP8LAddGreenToBlueAndRed = AddGreenToBlueAndRed;
-  VP8LTransformColorInverse = TransformColorInverse;
+  VP8LAddGreenToBlueAndRed = AddGreenToBlueAndRed_NEON;
+  VP8LTransformColorInverse = TransformColorInverse_NEON;
 }
 
 #else  // !WEBP_USE_NEON
diff --git a/media/libwebp/dsp/lossless_sse2.c b/media/libwebp/dsp/lossless_sse2.c
index 15aae93869..c40fcfb769 100644
--- a/media/libwebp/dsp/lossless_sse2.c
+++ b/media/libwebp/dsp/lossless_sse2.c
@@ -11,21 +11,22 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#include "./dsp.h"
+#include "../dsp/dsp.h"
 
 #if defined(WEBP_USE_SSE2)
 
-#include "./common_sse2.h"
-#include "./lossless.h"
-#include "./lossless_common.h"
+#include "../dsp/common_sse2.h"
+#include "../dsp/lossless.h"
+#include "../dsp/lossless_common.h"
 #include <assert.h>
 #include <emmintrin.h>
 
 //------------------------------------------------------------------------------
 // Predictor Transform
 
-static WEBP_INLINE uint32_t ClampedAddSubtractFull(uint32_t c0, uint32_t c1,
-                                                   uint32_t c2) {
+static WEBP_INLINE uint32_t ClampedAddSubtractFull_SSE2(uint32_t c0,
+                                                        uint32_t c1,
+                                                        uint32_t c2) {
   const __m128i zero = _mm_setzero_si128();
   const __m128i C0 = _mm_unpacklo_epi8(_mm_cvtsi32_si128(c0), zero);
   const __m128i C1 = _mm_unpacklo_epi8(_mm_cvtsi32_si128(c1), zero);
@@ -37,8 +38,9 @@ static WEBP_INLINE uint32_t ClampedAddSubtractFull(uint32_t c0, uint32_t c1,
   return output;
 }
 
-static WEBP_INLINE uint32_t ClampedAddSubtractHalf(uint32_t c0, uint32_t c1,
-                                                   uint32_t c2) {
+static WEBP_INLINE uint32_t ClampedAddSubtractHalf_SSE2(uint32_t c0,
+                                                        uint32_t c1,
+                                                        uint32_t c2) {
   const __m128i zero = _mm_setzero_si128();
   const __m128i C0 = _mm_unpacklo_epi8(_mm_cvtsi32_si128(c0), zero);
   const __m128i C1 = _mm_unpacklo_epi8(_mm_cvtsi32_si128(c1), zero);
@@ -55,7 +57,7 @@ static WEBP_INLINE uint32_t ClampedAddSubtractHalf(uint32_t c0, uint32_t c1,
   return output;
 }
 
-static WEBP_INLINE uint32_t Select(uint32_t a, uint32_t b, uint32_t c) {
+static WEBP_INLINE uint32_t Select_SSE2(uint32_t a, uint32_t b, uint32_t c) {
   int pa_minus_pb;
   const __m128i zero = _mm_setzero_si128();
   const __m128i A0 = _mm_cvtsi32_si128(a);
@@ -88,8 +90,9 @@ static WEBP_INLINE void Average2_m128i(const __m128i* const a0,
   *avg = _mm_sub_epi8(avg1, one);
 }
 
-static WEBP_INLINE void Average2_uint32(const uint32_t a0, const uint32_t a1,
-                                        __m128i* const avg) {
+static WEBP_INLINE void Average2_uint32_SSE2(const uint32_t a0,
+                                             const uint32_t a1,
+                                             __m128i* const avg) {
   // (a + b) >> 1 = ((a + b + 1) >> 1) - ((a ^ b) & 1)
   const __m128i ones = _mm_set1_epi8(1);
   const __m128i A0 = _mm_cvtsi32_si128(a0);
@@ -99,7 +102,7 @@ static WEBP_INLINE void Average2_uint32(const uint32_t a0, const uint32_t a1,
   *avg = _mm_sub_epi8(avg1, one);
 }
 
-static WEBP_INLINE __m128i Average2_uint32_16(uint32_t a0, uint32_t a1) {
+static WEBP_INLINE __m128i Average2_uint32_16_SSE2(uint32_t a0, uint32_t a1) {
   const __m128i zero = _mm_setzero_si128();
   const __m128i A0 = _mm_unpacklo_epi8(_mm_cvtsi32_si128(a0), zero);
   const __m128i A1 = _mm_unpacklo_epi8(_mm_cvtsi32_si128(a1), zero);
@@ -107,15 +110,16 @@ static WEBP_INLINE __m128i Average2_uint32_16(uint32_t a0, uint32_t a1) {
   return _mm_srli_epi16(sum, 1);
 }
 
-static WEBP_INLINE uint32_t Average2(uint32_t a0, uint32_t a1) {
+static WEBP_INLINE uint32_t Average2_SSE2(uint32_t a0, uint32_t a1) {
   __m128i output;
-  Average2_uint32(a0, a1, &output);
+  Average2_uint32_SSE2(a0, a1, &output);
   return _mm_cvtsi128_si32(output);
 }
 
-static WEBP_INLINE uint32_t Average3(uint32_t a0, uint32_t a1, uint32_t a2) {
+static WEBP_INLINE uint32_t Average3_SSE2(uint32_t a0, uint32_t a1,
+                                          uint32_t a2) {
   const __m128i zero = _mm_setzero_si128();
-  const __m128i avg1 = Average2_uint32_16(a0, a2);
+  const __m128i avg1 = Average2_uint32_16_SSE2(a0, a2);
   const __m128i A1 = _mm_unpacklo_epi8(_mm_cvtsi32_si128(a1), zero);
   const __m128i sum = _mm_add_epi16(avg1, A1);
   const __m128i avg2 = _mm_srli_epi16(sum, 1);
@@ -124,10 +128,10 @@ static WEBP_INLINE uint32_t Average3(uint32_t a0, uint32_t a1, uint32_t a2) {
   return output;
 }
 
-static WEBP_INLINE uint32_t Average4(uint32_t a0, uint32_t a1,
-                                     uint32_t a2, uint32_t a3) {
-  const __m128i avg1 = Average2_uint32_16(a0, a1);
-  const __m128i avg2 = Average2_uint32_16(a2, a3);
+static WEBP_INLINE uint32_t Average4_SSE2(uint32_t a0, uint32_t a1,
+                                          uint32_t a2, uint32_t a3) {
+  const __m128i avg1 = Average2_uint32_16_SSE2(a0, a1);
+  const __m128i avg2 = Average2_uint32_16_SSE2(a2, a3);
   const __m128i sum = _mm_add_epi16(avg2, avg1);
   const __m128i avg3 = _mm_srli_epi16(sum, 1);
   const __m128i A0 = _mm_packus_epi16(avg3, avg3);
@@ -136,41 +140,41 @@ static WEBP_INLINE uint32_t Average4(uint32_t a0, uint32_t a1,
 }
 
 static uint32_t Predictor5_SSE2(uint32_t left, const uint32_t* const top) {
-  const uint32_t pred = Average3(left, top[0], top[1]);
+  const uint32_t pred = Average3_SSE2(left, top[0], top[1]);
   return pred;
 }
 static uint32_t Predictor6_SSE2(uint32_t left, const uint32_t* const top) {
-  const uint32_t pred = Average2(left, top[-1]);
+  const uint32_t pred = Average2_SSE2(left, top[-1]);
   return pred;
 }
 static uint32_t Predictor7_SSE2(uint32_t left, const uint32_t* const top) {
-  const uint32_t pred = Average2(left, top[0]);
+  const uint32_t pred = Average2_SSE2(left, top[0]);
   return pred;
 }
 static uint32_t Predictor8_SSE2(uint32_t left, const uint32_t* const top) {
-  const uint32_t pred = Average2(top[-1], top[0]);
+  const uint32_t pred = Average2_SSE2(top[-1], top[0]);
   (void)left;
   return pred;
 }
 static uint32_t Predictor9_SSE2(uint32_t left, const uint32_t* const top) {
-  const uint32_t pred = Average2(top[0], top[1]);
+  const uint32_t pred = Average2_SSE2(top[0], top[1]);
   (void)left;
   return pred;
 }
 static uint32_t Predictor10_SSE2(uint32_t left, const uint32_t* const top) {
-  const uint32_t pred = Average4(left, top[-1], top[0], top[1]);
+  const uint32_t pred = Average4_SSE2(left, top[-1], top[0], top[1]);
   return pred;
 }
 static uint32_t Predictor11_SSE2(uint32_t left, const uint32_t* const top) {
-  const uint32_t pred = Select(top[0], left, top[-1]);
+  const uint32_t pred = Select_SSE2(top[0], left, top[-1]);
   return pred;
 }
 static uint32_t Predictor12_SSE2(uint32_t left, const uint32_t* const top) {
-  const uint32_t pred = ClampedAddSubtractFull(left, top[0], top[-1]);
+  const uint32_t pred = ClampedAddSubtractFull_SSE2(left, top[0], top[-1]);
   return pred;
 }
 static uint32_t Predictor13_SSE2(uint32_t left, const uint32_t* const top) {
-  const uint32_t pred = ClampedAddSubtractHalf(left, top[0], top[-1]);
+  const uint32_t pred = ClampedAddSubtractHalf_SSE2(left, top[0], top[-1]);
   return pred;
 }
 
@@ -272,9 +276,24 @@ GENERATE_PREDICTOR_2(9, upper[i + 1])
 #undef GENERATE_PREDICTOR_2
 
 // Predictor10: average of (average of (L,TL), average of (T, TR)).
+#define DO_PRED10(OUT) do {               \
+  __m128i avgLTL, avg;                    \
+  Average2_m128i(&L, &TL, &avgLTL);       \
+  Average2_m128i(&avgTTR, &avgLTL, &avg); \
+  L = _mm_add_epi8(avg, src);             \
+  out[i + (OUT)] = _mm_cvtsi128_si32(L);  \
+} while (0)
+
+#define DO_PRED10_SHIFT do {                                  \
+  /* Rotate the pre-computed values for the next iteration.*/ \
+  avgTTR = _mm_srli_si128(avgTTR, 4);                         \
+  TL = _mm_srli_si128(TL, 4);                                 \
+  src = _mm_srli_si128(src, 4);                               \
+} while (0)
+
 static void PredictorAdd10_SSE2(const uint32_t* in, const uint32_t* upper,
                                 int num_pixels, uint32_t* out) {
-  int i, j;
+  int i;
   __m128i L = _mm_cvtsi32_si128(out[-1]);
   for (i = 0; i + 4 <= num_pixels; i += 4) {
     __m128i src = _mm_loadu_si128((const __m128i*)&in[i]);
@@ -283,79 +302,90 @@ static void PredictorAdd10_SSE2(const uint32_t* in, const uint32_t* upper,
     const __m128i TR = _mm_loadu_si128((const __m128i*)&upper[i + 1]);
     __m128i avgTTR;
     Average2_m128i(&T, &TR, &avgTTR);
-    for (j = 0; j < 4; ++j) {
-      __m128i avgLTL, avg;
-      Average2_m128i(&L, &TL, &avgLTL);
-      Average2_m128i(&avgTTR, &avgLTL, &avg);
-      L = _mm_add_epi8(avg, src);
-      out[i + j] = _mm_cvtsi128_si32(L);
-      // Rotate the pre-computed values for the next iteration.
-      avgTTR = _mm_srli_si128(avgTTR, 4);
-      TL = _mm_srli_si128(TL, 4);
-      src = _mm_srli_si128(src, 4);
-    }
+    DO_PRED10(0);
+    DO_PRED10_SHIFT;
+    DO_PRED10(1);
+    DO_PRED10_SHIFT;
+    DO_PRED10(2);
+    DO_PRED10_SHIFT;
+    DO_PRED10(3);
   }
   if (i != num_pixels) {
     VP8LPredictorsAdd_C[10](in + i, upper + i, num_pixels - i, out + i);
   }
 }
+#undef DO_PRED10
+#undef DO_PRED10_SHIFT
 
 // Predictor11: select.
-static void GetSumAbsDiff32(const __m128i* const A, const __m128i* const B,
-                            __m128i* const out) {
-  // We can unpack with any value on the upper 32 bits, provided it's the same
-  // on both operands (to that their sum of abs diff is zero). Here we use *A.
-  const __m128i A_lo = _mm_unpacklo_epi32(*A, *A);
-  const __m128i B_lo = _mm_unpacklo_epi32(*B, *A);
-  const __m128i A_hi = _mm_unpackhi_epi32(*A, *A);
-  const __m128i B_hi = _mm_unpackhi_epi32(*B, *A);
-  const __m128i s_lo = _mm_sad_epu8(A_lo, B_lo);
-  const __m128i s_hi = _mm_sad_epu8(A_hi, B_hi);
-  *out = _mm_packs_epi32(s_lo, s_hi);
-}
+#define DO_PRED11(OUT) do {                                            \
+  const __m128i L_lo = _mm_unpacklo_epi32(L, T);                       \
+  const __m128i TL_lo = _mm_unpacklo_epi32(TL, T);                     \
+  const __m128i pb = _mm_sad_epu8(L_lo, TL_lo); /* pb = sum |L-TL|*/   \
+  const __m128i mask = _mm_cmpgt_epi32(pb, pa);                        \
+  const __m128i A = _mm_and_si128(mask, L);                            \
+  const __m128i B = _mm_andnot_si128(mask, T);                         \
+  const __m128i pred = _mm_or_si128(A, B); /* pred = (pa > b)? L : T*/ \
+  L = _mm_add_epi8(src, pred);                                         \
+  out[i + (OUT)] = _mm_cvtsi128_si32(L);                               \
+} while (0)
+
+#define DO_PRED11_SHIFT do {                                \
+  /* Shift the pre-computed value for the next iteration.*/ \
+  T = _mm_srli_si128(T, 4);                                 \
+  TL = _mm_srli_si128(TL, 4);                               \
+  src = _mm_srli_si128(src, 4);                             \
+  pa = _mm_srli_si128(pa, 4);                               \
+} while (0)
 
 static void PredictorAdd11_SSE2(const uint32_t* in, const uint32_t* upper,
                                 int num_pixels, uint32_t* out) {
-  int i, j;
+  int i;
+  __m128i pa;
   __m128i L = _mm_cvtsi32_si128(out[-1]);
   for (i = 0; i + 4 <= num_pixels; i += 4) {
     __m128i T = _mm_loadu_si128((const __m128i*)&upper[i]);
     __m128i TL = _mm_loadu_si128((const __m128i*)&upper[i - 1]);
     __m128i src = _mm_loadu_si128((const __m128i*)&in[i]);
-    __m128i pa;
-    GetSumAbsDiff32(&T, &TL, &pa);   // pa = sum |T-TL|
-    for (j = 0; j < 4; ++j) {
-      const __m128i L_lo = _mm_unpacklo_epi32(L, L);
-      const __m128i TL_lo = _mm_unpacklo_epi32(TL, L);
-      const __m128i pb = _mm_sad_epu8(L_lo, TL_lo);  // pb = sum |L-TL|
-      const __m128i mask = _mm_cmpgt_epi32(pb, pa);
-      const __m128i A = _mm_and_si128(mask, L);
-      const __m128i B = _mm_andnot_si128(mask, T);
-      const __m128i pred = _mm_or_si128(A, B);    // pred = (L > T)? L : T
-      L = _mm_add_epi8(src, pred);
-      out[i + j] = _mm_cvtsi128_si32(L);
-      // Shift the pre-computed value for the next iteration.
-      T = _mm_srli_si128(T, 4);
-      TL = _mm_srli_si128(TL, 4);
-      src = _mm_srli_si128(src, 4);
-      pa = _mm_srli_si128(pa, 4);
+    {
+      // We can unpack with any value on the upper 32 bits, provided it's the
+      // same on both operands (so that their sum of abs diff is zero). Here we
+      // use T.
+      const __m128i T_lo = _mm_unpacklo_epi32(T, T);
+      const __m128i TL_lo = _mm_unpacklo_epi32(TL, T);
+      const __m128i T_hi = _mm_unpackhi_epi32(T, T);
+      const __m128i TL_hi = _mm_unpackhi_epi32(TL, T);
+      const __m128i s_lo = _mm_sad_epu8(T_lo, TL_lo);
+      const __m128i s_hi = _mm_sad_epu8(T_hi, TL_hi);
+      pa = _mm_packs_epi32(s_lo, s_hi);  // pa = sum |T-TL|
     }
+    DO_PRED11(0);
+    DO_PRED11_SHIFT;
+    DO_PRED11(1);
+    DO_PRED11_SHIFT;
+    DO_PRED11(2);
+    DO_PRED11_SHIFT;
+    DO_PRED11(3);
   }
   if (i != num_pixels) {
     VP8LPredictorsAdd_C[11](in + i, upper + i, num_pixels - i, out + i);
   }
 }
+#undef DO_PRED11
+#undef DO_PRED11_SHIFT
 
 // Predictor12: ClampedAddSubtractFull.
-#define DO_PRED12(DIFF, LANE, OUT)                          \
-do {                                                        \
-  const __m128i all = _mm_add_epi16(L, (DIFF));             \
-  const __m128i alls = _mm_packus_epi16(all, all);          \
-  const __m128i res = _mm_add_epi8(src, alls);              \
-  out[i + (OUT)] = _mm_cvtsi128_si32(res);                  \
-  L = _mm_unpacklo_epi8(res, zero);                         \
+#define DO_PRED12(DIFF, LANE, OUT) do {            \
+  const __m128i all = _mm_add_epi16(L, (DIFF));    \
+  const __m128i alls = _mm_packus_epi16(all, all); \
+  const __m128i res = _mm_add_epi8(src, alls);     \
+  out[i + (OUT)] = _mm_cvtsi128_si32(res);         \
+  L = _mm_unpacklo_epi8(res, zero);                \
+} while (0)
+
+#define DO_PRED12_SHIFT(DIFF, LANE) do {                    \
   /* Shift the pre-computed value for the next iteration.*/ \
-  if (LANE == 0) (DIFF) = _mm_srli_si128((DIFF), 8);        \
+  if ((LANE) == 0) (DIFF) = _mm_srli_si128((DIFF), 8);      \
   src = _mm_srli_si128(src, 4);                             \
 } while (0)
 
@@ -377,8 +407,11 @@ static void PredictorAdd12_SSE2(const uint32_t* in, const uint32_t* upper,
     __m128i diff_lo = _mm_sub_epi16(T_lo, TL_lo);
     __m128i diff_hi = _mm_sub_epi16(T_hi, TL_hi);
     DO_PRED12(diff_lo, 0, 0);
+    DO_PRED12_SHIFT(diff_lo, 0);
     DO_PRED12(diff_lo, 1, 1);
+    DO_PRED12_SHIFT(diff_lo, 1);
     DO_PRED12(diff_hi, 0, 2);
+    DO_PRED12_SHIFT(diff_hi, 0);
     DO_PRED12(diff_hi, 1, 3);
   }
   if (i != num_pixels) {
@@ -386,6 +419,7 @@ static void PredictorAdd12_SSE2(const uint32_t* in, const uint32_t* upper,
   }
 }
 #undef DO_PRED12
+#undef DO_PRED12_SHIFT
 
 // Due to averages with integers, values cannot be accumulated in parallel for
 // predictors 13.
@@ -394,8 +428,8 @@ GENERATE_PREDICTOR_ADD(Predictor13_SSE2, PredictorAdd13_SSE2)
 //------------------------------------------------------------------------------
 // Subtract-Green Transform
 
-static void AddGreenToBlueAndRed(const uint32_t* const src, int num_pixels,
-                                 uint32_t* dst) {
+static void AddGreenToBlueAndRed_SSE2(const uint32_t* const src, int num_pixels,
+                                      uint32_t* dst) {
   int i;
   for (i = 0; i + 4 <= num_pixels; i += 4) {
     const __m128i in = _mm_loadu_si128((const __m128i*)&src[i]); // argb
@@ -414,19 +448,16 @@ static void AddGreenToBlueAndRed(const uint32_t* const src, int num_pixels,
 //------------------------------------------------------------------------------
 // Color Transform
 
-static void TransformColorInverse(const VP8LMultipliers* const m,
-                                  const uint32_t* const src, int num_pixels,
-                                  uint32_t* dst) {
+static void TransformColorInverse_SSE2(const VP8LMultipliers* const m,
+                                       const uint32_t* const src,
+                                       int num_pixels, uint32_t* dst) {
 // sign-extended multiplying constants, pre-shifted by 5.
 #define CST(X)  (((int16_t)(m->X << 8)) >> 5)   // sign-extend
-  const __m128i mults_rb = _mm_set_epi16(
-      CST(green_to_red_), CST(green_to_blue_),
-      CST(green_to_red_), CST(green_to_blue_),
-      CST(green_to_red_), CST(green_to_blue_),
-      CST(green_to_red_), CST(green_to_blue_));
-  const __m128i mults_b2 = _mm_set_epi16(
-      CST(red_to_blue_), 0, CST(red_to_blue_), 0,
-      CST(red_to_blue_), 0, CST(red_to_blue_), 0);
+#define MK_CST_16(HI, LO) \
+  _mm_set1_epi32((int)(((uint32_t)(HI) << 16) | ((LO) & 0xffff)))
+  const __m128i mults_rb = MK_CST_16(CST(green_to_red_), CST(green_to_blue_));
+  const __m128i mults_b2 = MK_CST_16(CST(red_to_blue_), 0);
+#undef MK_CST_16
 #undef CST
   const __m128i mask_ag = _mm_set1_epi32(0xff00ff00);  // alpha-green masks
   int i;
@@ -454,8 +485,8 @@ static void TransformColorInverse(const VP8LMultipliers* const m,
 //------------------------------------------------------------------------------
 // Color-space conversion functions
 
-static void ConvertBGRAToRGB(const uint32_t* src, int num_pixels,
-                             uint8_t* dst) {
+static void ConvertBGRAToRGB_SSE2(const uint32_t* src, int num_pixels,
+                                  uint8_t* dst) {
   const __m128i* in = (const __m128i*)src;
   __m128i* out = (__m128i*)dst;
 
@@ -469,11 +500,11 @@ static void ConvertBGRAToRGB(const uint32_t* src, int num_pixels,
     __m128i in5 = _mm_loadu_si128(in + 5);
     __m128i in6 = _mm_loadu_si128(in + 6);
     __m128i in7 = _mm_loadu_si128(in + 7);
-    VP8L32bToPlanar(&in0, &in1, &in2, &in3);
-    VP8L32bToPlanar(&in4, &in5, &in6, &in7);
+    VP8L32bToPlanar_SSE2(&in0, &in1, &in2, &in3);
+    VP8L32bToPlanar_SSE2(&in4, &in5, &in6, &in7);
     // At this points, in1/in5 contains red only, in2/in6 green only ...
     // Pack the colors in 24b RGB.
-    VP8PlanarTo24b(&in1, &in5, &in2, &in6, &in3, &in7);
+    VP8PlanarTo24b_SSE2(&in1, &in5, &in2, &in6, &in3, &in7);
     _mm_storeu_si128(out + 0, in1);
     _mm_storeu_si128(out + 1, in5);
     _mm_storeu_si128(out + 2, in2);
@@ -490,27 +521,26 @@ static void ConvertBGRAToRGB(const uint32_t* src, int num_pixels,
   }
 }
 
-static void ConvertBGRAToRGBA(const uint32_t* src,
-                              int num_pixels, uint8_t* dst) {
+static void ConvertBGRAToRGBA_SSE2(const uint32_t* src,
+                                   int num_pixels, uint8_t* dst) {
+  const __m128i red_blue_mask = _mm_set1_epi32(0x00ff00ffu);
   const __m128i* in = (const __m128i*)src;
   __m128i* out = (__m128i*)dst;
   while (num_pixels >= 8) {
-    const __m128i bgra0 = _mm_loadu_si128(in++);     // bgra0|bgra1|bgra2|bgra3
-    const __m128i bgra4 = _mm_loadu_si128(in++);     // bgra4|bgra5|bgra6|bgra7
-    const __m128i v0l = _mm_unpacklo_epi8(bgra0, bgra4);  // b0b4g0g4r0r4a0a4...
-    const __m128i v0h = _mm_unpackhi_epi8(bgra0, bgra4);  // b2b6g2g6r2r6a2a6...
-    const __m128i v1l = _mm_unpacklo_epi8(v0l, v0h);   // b0b2b4b6g0g2g4g6...
-    const __m128i v1h = _mm_unpackhi_epi8(v0l, v0h);   // b1b3b5b7g1g3g5g7...
-    const __m128i v2l = _mm_unpacklo_epi8(v1l, v1h);   // b0...b7 | g0...g7
-    const __m128i v2h = _mm_unpackhi_epi8(v1l, v1h);   // r0...r7 | a0...a7
-    const __m128i ga0 = _mm_unpackhi_epi64(v2l, v2h);  // g0...g7 | a0...a7
-    const __m128i rb0 = _mm_unpacklo_epi64(v2h, v2l);  // r0...r7 | b0...b7
-    const __m128i rg0 = _mm_unpacklo_epi8(rb0, ga0);   // r0g0r1g1 ... r6g6r7g7
-    const __m128i ba0 = _mm_unpackhi_epi8(rb0, ga0);   // b0a0b1a1 ... b6a6b7a7
-    const __m128i rgba0 = _mm_unpacklo_epi16(rg0, ba0);  // rgba0|rgba1...
-    const __m128i rgba4 = _mm_unpackhi_epi16(rg0, ba0);  // rgba4|rgba5...
-    _mm_storeu_si128(out++, rgba0);
-    _mm_storeu_si128(out++, rgba4);
+    const __m128i A1 = _mm_loadu_si128(in++);
+    const __m128i A2 = _mm_loadu_si128(in++);
+    const __m128i B1 = _mm_and_si128(A1, red_blue_mask);     // R 0 B 0
+    const __m128i B2 = _mm_and_si128(A2, red_blue_mask);     // R 0 B 0
+    const __m128i C1 = _mm_andnot_si128(red_blue_mask, A1);  // 0 G 0 A
+    const __m128i C2 = _mm_andnot_si128(red_blue_mask, A2);  // 0 G 0 A
+    const __m128i D1 = _mm_shufflelo_epi16(B1, _MM_SHUFFLE(2, 3, 0, 1));
+    const __m128i D2 = _mm_shufflelo_epi16(B2, _MM_SHUFFLE(2, 3, 0, 1));
+    const __m128i E1 = _mm_shufflehi_epi16(D1, _MM_SHUFFLE(2, 3, 0, 1));
+    const __m128i E2 = _mm_shufflehi_epi16(D2, _MM_SHUFFLE(2, 3, 0, 1));
+    const __m128i F1 = _mm_or_si128(E1, C1);
+    const __m128i F2 = _mm_or_si128(E2, C2);
+    _mm_storeu_si128(out++, F1);
+    _mm_storeu_si128(out++, F2);
     num_pixels -= 8;
   }
   // left-overs
@@ -519,8 +549,8 @@ static void ConvertBGRAToRGBA(const uint32_t* src,
   }
 }
 
-static void ConvertBGRAToRGBA4444(const uint32_t* src,
-                                  int num_pixels, uint8_t* dst) {
+static void ConvertBGRAToRGBA4444_SSE2(const uint32_t* src,
+                                       int num_pixels, uint8_t* dst) {
   const __m128i mask_0x0f = _mm_set1_epi8(0x0f);
   const __m128i mask_0xf0 = _mm_set1_epi8(0xf0);
   const __m128i* in = (const __m128i*)src;
@@ -541,7 +571,7 @@ static void ConvertBGRAToRGBA4444(const uint32_t* src,
     const __m128i ga2 = _mm_and_si128(ga1, mask_0x0f);  // g0-|g1-|...|a6-|a7-
     const __m128i rgba0 = _mm_or_si128(ga2, rb1);       // rg0..rg7 | ba0..ba7
     const __m128i rgba1 = _mm_srli_si128(rgba0, 8);     // ba0..ba7 | 0
-#ifdef WEBP_SWAP_16BIT_CSP
+#if (WEBP_SWAP_16BIT_CSP == 1)
     const __m128i rgba = _mm_unpacklo_epi8(rgba1, rgba0);  // barg0...barg7
 #else
     const __m128i rgba = _mm_unpacklo_epi8(rgba0, rgba1);  // rgba0...rgba7
@@ -555,8 +585,8 @@ static void ConvertBGRAToRGBA4444(const uint32_t* src,
   }
 }
 
-static void ConvertBGRAToRGB565(const uint32_t* src,
-                                int num_pixels, uint8_t* dst) {
+static void ConvertBGRAToRGB565_SSE2(const uint32_t* src,
+                                     int num_pixels, uint8_t* dst) {
   const __m128i mask_0xe0 = _mm_set1_epi8(0xe0);
   const __m128i mask_0xf8 = _mm_set1_epi8(0xf8);
   const __m128i mask_0x07 = _mm_set1_epi8(0x07);
@@ -582,7 +612,7 @@ static void ConvertBGRAToRGB565(const uint32_t* src,
     const __m128i rg1 = _mm_or_si128(rb1, g_lo2);           // gr0...gr7|xx
     const __m128i b1 = _mm_srli_epi16(b0, 3);
     const __m128i gb1 = _mm_or_si128(b1, g_hi2);            // bg0...bg7|xx
-#ifdef WEBP_SWAP_16BIT_CSP
+#if (WEBP_SWAP_16BIT_CSP == 1)
     const __m128i rgba = _mm_unpacklo_epi8(gb1, rg1);     // rggb0...rggb7
 #else
     const __m128i rgba = _mm_unpacklo_epi8(rg1, gb1);     // bgrb0...bgrb7
@@ -596,8 +626,8 @@ static void ConvertBGRAToRGB565(const uint32_t* src,
   }
 }
 
-static void ConvertBGRAToBGR(const uint32_t* src,
-                             int num_pixels, uint8_t* dst) {
+static void ConvertBGRAToBGR_SSE2(const uint32_t* src,
+                                  int num_pixels, uint8_t* dst) {
   const __m128i mask_l = _mm_set_epi32(0, 0x00ffffff, 0, 0x00ffffff);
   const __m128i mask_h = _mm_set_epi32(0x00ffffff, 0, 0x00ffffff, 0);
   const __m128i* in = (const __m128i*)src;
@@ -660,14 +690,14 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8LDspInitSSE2(void) {
   VP8LPredictorsAdd[12] = PredictorAdd12_SSE2;
   VP8LPredictorsAdd[13] = PredictorAdd13_SSE2;
 
-  VP8LAddGreenToBlueAndRed = AddGreenToBlueAndRed;
-  VP8LTransformColorInverse = TransformColorInverse;
+  VP8LAddGreenToBlueAndRed = AddGreenToBlueAndRed_SSE2;
+  VP8LTransformColorInverse = TransformColorInverse_SSE2;
 
-  VP8LConvertBGRAToRGB = ConvertBGRAToRGB;
-  VP8LConvertBGRAToRGBA = ConvertBGRAToRGBA;
-  VP8LConvertBGRAToRGBA4444 = ConvertBGRAToRGBA4444;
-  VP8LConvertBGRAToRGB565 = ConvertBGRAToRGB565;
-  VP8LConvertBGRAToBGR = ConvertBGRAToBGR;
+  VP8LConvertBGRAToRGB = ConvertBGRAToRGB_SSE2;
+  VP8LConvertBGRAToRGBA = ConvertBGRAToRGBA_SSE2;
+  VP8LConvertBGRAToRGBA4444 = ConvertBGRAToRGBA4444_SSE2;
+  VP8LConvertBGRAToRGB565 = ConvertBGRAToRGB565_SSE2;
+  VP8LConvertBGRAToBGR = ConvertBGRAToBGR_SSE2;
 }
 
 #else  // !WEBP_USE_SSE2
diff --git a/media/libwebp/dsp/msa_macro.h b/media/libwebp/dsp/msa_macro.h
index d0e5f45e01..dfacda6ccd 100644
--- a/media/libwebp/dsp/msa_macro.h
+++ b/media/libwebp/dsp/msa_macro.h
@@ -22,6 +22,7 @@
 #endif
 
 #ifdef CLANG_BUILD
+  #define ALPHAVAL  (-1)
   #define ADDVI_H(a, b)  __msa_addvi_h((v8i16)a, b)
   #define ADDVI_W(a, b)  __msa_addvi_w((v4i32)a, b)
   #define SRAI_B(a, b)  __msa_srai_b((v16i8)a, b)
@@ -32,6 +33,7 @@
   #define ANDI_B(a, b)  __msa_andi_b((v16u8)a, b)
   #define ORI_B(a, b)   __msa_ori_b((v16u8)a, b)
 #else
+  #define ALPHAVAL  (0xff)
   #define ADDVI_H(a, b)  (a + b)
   #define ADDVI_W(a, b)  (a + b)
   #define SRAI_B(a, b)  (a >> b)
diff --git a/media/libwebp/dsp/neon.h b/media/libwebp/dsp/neon.h
index 3b548a6855..63c27a2901 100644
--- a/media/libwebp/dsp/neon.h
+++ b/media/libwebp/dsp/neon.h
@@ -14,11 +14,12 @@
 
 #include <arm_neon.h>
 
-#include "./dsp.h"
+#include "../dsp/dsp.h"
 
 // Right now, some intrinsics functions seem slower, so we disable them
-// everywhere except aarch64 where the inline assembly is incompatible.
-#if defined(__aarch64__)
+// everywhere except newer clang/gcc or aarch64 where the inline assembly is
+// incompatible.
+#if LOCAL_CLANG_PREREQ(3,8) || LOCAL_GCC_PREREQ(4,9) || defined(__aarch64__)
 #define WEBP_USE_INTRINSICS   // use intrinsics when possible
 #endif
 
@@ -43,11 +44,11 @@
 // if using intrinsics, this flag avoids some functions that make gcc-4.6.3
 // crash ("internal compiler error: in immed_double_const, at emit-rtl.").
 // (probably similar to gcc.gnu.org/bugzilla/show_bug.cgi?id=48183)
-#if !(LOCAL_GCC_PREREQ(4,8) || defined(__aarch64__))
+#if !(LOCAL_CLANG_PREREQ(3,8) || LOCAL_GCC_PREREQ(4,8) || defined(__aarch64__))
 #define WORK_AROUND_GCC
 #endif
 
-static WEBP_INLINE int32x4x4_t Transpose4x4(const int32x4x4_t rows) {
+static WEBP_INLINE int32x4x4_t Transpose4x4_NEON(const int32x4x4_t rows) {
   uint64x2x2_t row01, row23;
 
   row01.val[0] = vreinterpretq_u64_s32(rows.val[0]);
diff --git a/media/libwebp/dsp/rescaler.c b/media/libwebp/dsp/rescaler.c
index 0f54502352..f70e6beeff 100644
--- a/media/libwebp/dsp/rescaler.c
+++ b/media/libwebp/dsp/rescaler.c
@@ -13,7 +13,7 @@
 
 #include <assert.h>
 
-#include "./dsp.h"
+#include "../dsp/dsp.h"
 #include "../utils/rescaler_utils.h"
 
 //------------------------------------------------------------------------------
@@ -25,7 +25,8 @@
 //------------------------------------------------------------------------------
 // Row import
 
-void WebPRescalerImportRowExpandC(WebPRescaler* const wrk, const uint8_t* src) {
+void WebPRescalerImportRowExpand_C(WebPRescaler* const wrk,
+                                   const uint8_t* src) {
   const int x_stride = wrk->num_channels;
   const int x_out_max = wrk->dst_width * wrk->num_channels;
   int channel;
@@ -56,7 +57,8 @@ void WebPRescalerImportRowExpandC(WebPRescaler* const wrk, const uint8_t* src) {
   }
 }
 
-void WebPRescalerImportRowShrinkC(WebPRescaler* const wrk, const uint8_t* src) {
+void WebPRescalerImportRowShrink_C(WebPRescaler* const wrk,
+                                   const uint8_t* src) {
   const int x_stride = wrk->num_channels;
   const int x_out_max = wrk->dst_width * wrk->num_channels;
   int channel;
@@ -92,7 +94,7 @@ void WebPRescalerImportRowShrinkC(WebPRescaler* const wrk, const uint8_t* src) {
 //------------------------------------------------------------------------------
 // Row export
 
-void WebPRescalerExportRowExpandC(WebPRescaler* const wrk) {
+void WebPRescalerExportRowExpand_C(WebPRescaler* const wrk) {
   int x_out;
   uint8_t* const dst = wrk->dst;
   rescaler_t* const irow = wrk->irow;
@@ -123,7 +125,7 @@ void WebPRescalerExportRowExpandC(WebPRescaler* const wrk) {
   }
 }
 
-void WebPRescalerExportRowShrinkC(WebPRescaler* const wrk) {
+void WebPRescalerExportRowShrink_C(WebPRescaler* const wrk) {
   int x_out;
   uint8_t* const dst = wrk->dst;
   rescaler_t* const irow = wrk->irow;
@@ -202,16 +204,15 @@ extern void WebPRescalerDspInitMIPSdspR2(void);
 extern void WebPRescalerDspInitMSA(void);
 extern void WebPRescalerDspInitNEON(void);
 
-static volatile VP8CPUInfo rescaler_last_cpuinfo_used =
-    (VP8CPUInfo)&rescaler_last_cpuinfo_used;
-
-WEBP_TSAN_IGNORE_FUNCTION void WebPRescalerDspInit(void) {
-  if (rescaler_last_cpuinfo_used == VP8GetCPUInfo) return;
+WEBP_DSP_INIT_FUNC(WebPRescalerDspInit) {
+#if !defined(WEBP_REDUCE_SIZE)
+#if !WEBP_NEON_OMIT_C_CODE
+  WebPRescalerExportRowExpand = WebPRescalerExportRowExpand_C;
+  WebPRescalerExportRowShrink = WebPRescalerExportRowShrink_C;
+#endif
 
-  WebPRescalerImportRowExpand = WebPRescalerImportRowExpandC;
-  WebPRescalerImportRowShrink = WebPRescalerImportRowShrinkC;
-  WebPRescalerExportRowExpand = WebPRescalerExportRowExpandC;
-  WebPRescalerExportRowShrink = WebPRescalerExportRowShrinkC;
+  WebPRescalerImportRowExpand = WebPRescalerImportRowExpand_C;
+  WebPRescalerImportRowShrink = WebPRescalerImportRowShrink_C;
 
   if (VP8GetCPUInfo != NULL) {
 #if defined(WEBP_USE_SSE2)
@@ -219,11 +220,6 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPRescalerDspInit(void) {
       WebPRescalerDspInitSSE2();
     }
 #endif
-#if defined(WEBP_USE_NEON)
-    if (VP8GetCPUInfo(kNEON)) {
-      WebPRescalerDspInitNEON();
-    }
-#endif
 #if defined(WEBP_USE_MIPS32)
     if (VP8GetCPUInfo(kMIPS32)) {
       WebPRescalerDspInitMIPS32();
@@ -240,5 +236,17 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPRescalerDspInit(void) {
     }
 #endif
   }
-  rescaler_last_cpuinfo_used = VP8GetCPUInfo;
+
+#if defined(WEBP_USE_NEON)
+  if (WEBP_NEON_OMIT_C_CODE ||
+      (VP8GetCPUInfo != NULL && VP8GetCPUInfo(kNEON))) {
+    WebPRescalerDspInitNEON();
+  }
+#endif
+
+  assert(WebPRescalerExportRowExpand != NULL);
+  assert(WebPRescalerExportRowShrink != NULL);
+  assert(WebPRescalerImportRowExpand != NULL);
+  assert(WebPRescalerImportRowShrink != NULL);
+#endif   // WEBP_REDUCE_SIZE
 }
diff --git a/media/libwebp/dsp/rescaler_neon.c b/media/libwebp/dsp/rescaler_neon.c
index b2dd8f30cc..835e646c1a 100644
--- a/media/libwebp/dsp/rescaler_neon.c
+++ b/media/libwebp/dsp/rescaler_neon.c
@@ -11,13 +11,13 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#include "./dsp.h"
+#include "../dsp/dsp.h"
 
-#if defined(WEBP_USE_NEON)
+#if defined(WEBP_USE_NEON) && !defined(WEBP_REDUCE_SIZE)
 
 #include <arm_neon.h>
 #include <assert.h>
-#include "./neon.h"
+#include "../dsp/neon.h"
 #include "../utils/rescaler_utils.h"
 
 #define ROUNDER (WEBP_RESCALER_ONE >> 1)
@@ -41,9 +41,9 @@
 #error "MULT_FIX/WEBP_RESCALER_RFIX need some more work"
 #endif
 
-static uint32x4_t Interpolate(const rescaler_t* const frow,
-                              const rescaler_t* const irow,
-                              uint32_t A, uint32_t B) {
+static uint32x4_t Interpolate_NEON(const rescaler_t* const frow,
+                                   const rescaler_t* const irow,
+                                   uint32_t A, uint32_t B) {
   LOAD_32x4(frow, A0);
   LOAD_32x4(irow, B0);
   const uint64x2_t C0 = vmull_n_u32(vget_low_u32(A0), A);
@@ -56,7 +56,7 @@ static uint32x4_t Interpolate(const rescaler_t* const frow,
   return E;
 }
 
-static void RescalerExportRowExpand(WebPRescaler* const wrk) {
+static void RescalerExportRowExpand_NEON(WebPRescaler* const wrk) {
   int x_out;
   uint8_t* const dst = wrk->dst;
   rescaler_t* const irow = wrk->irow;
@@ -91,9 +91,9 @@ static void RescalerExportRowExpand(WebPRescaler* const wrk) {
     const uint32_t A = (uint32_t)(WEBP_RESCALER_ONE - B);
     for (x_out = 0; x_out < max_span; x_out += 8) {
       const uint32x4_t C0 =
-          Interpolate(frow + x_out + 0, irow + x_out + 0, A, B);
+          Interpolate_NEON(frow + x_out + 0, irow + x_out + 0, A, B);
       const uint32x4_t C1 =
-          Interpolate(frow + x_out + 4, irow + x_out + 4, A, B);
+          Interpolate_NEON(frow + x_out + 4, irow + x_out + 4, A, B);
       const uint32x4_t D0 = MULT_FIX(C0, fy_scale_half);
       const uint32x4_t D1 = MULT_FIX(C1, fy_scale_half);
       const uint16x4_t E0 = vmovn_u32(D0);
@@ -112,7 +112,7 @@ static void RescalerExportRowExpand(WebPRescaler* const wrk) {
   }
 }
 
-static void RescalerExportRowShrink(WebPRescaler* const wrk) {
+static void RescalerExportRowShrink_NEON(WebPRescaler* const wrk) {
   int x_out;
   uint8_t* const dst = wrk->dst;
   rescaler_t* const irow = wrk->irow;
@@ -175,8 +175,8 @@ static void RescalerExportRowShrink(WebPRescaler* const wrk) {
 extern void WebPRescalerDspInitNEON(void);
 
 WEBP_TSAN_IGNORE_FUNCTION void WebPRescalerDspInitNEON(void) {
-  WebPRescalerExportRowExpand = RescalerExportRowExpand;
-  WebPRescalerExportRowShrink = RescalerExportRowShrink;
+  WebPRescalerExportRowExpand = RescalerExportRowExpand_NEON;
+  WebPRescalerExportRowShrink = RescalerExportRowShrink_NEON;
 }
 
 #else     // !WEBP_USE_NEON
diff --git a/media/libwebp/dsp/rescaler_sse2.c b/media/libwebp/dsp/rescaler_sse2.c
index 8271c22e05..1306f84579 100644
--- a/media/libwebp/dsp/rescaler_sse2.c
+++ b/media/libwebp/dsp/rescaler_sse2.c
@@ -11,9 +11,9 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#include "./dsp.h"
+#include "../dsp/dsp.h"
 
-#if defined(WEBP_USE_SSE2)
+#if defined(WEBP_USE_SSE2) && !defined(WEBP_REDUCE_SIZE)
 #include <emmintrin.h>
 
 #include <assert.h>
@@ -27,7 +27,7 @@
 #define MULT_FIX(x, y) (((uint64_t)(x) * (y) + ROUNDER) >> WEBP_RESCALER_RFIX)
 
 // input: 8 bytes ABCDEFGH -> output: A0E0B0F0C0G0D0H0
-static void LoadTwoPixels(const uint8_t* const src, __m128i* out) {
+static void LoadTwoPixels_SSE2(const uint8_t* const src, __m128i* out) {
   const __m128i zero = _mm_setzero_si128();
   const __m128i A = _mm_loadl_epi64((const __m128i*)(src));  // ABCDEFGH
   const __m128i B = _mm_unpacklo_epi8(A, zero);              // A0B0C0D0E0F0G0H0
@@ -36,28 +36,30 @@ static void LoadTwoPixels(const uint8_t* const src, __m128i* out) {
 }
 
 // input: 8 bytes ABCDEFGH -> output: A0B0C0D0E0F0G0H0
-static void LoadHeightPixels(const uint8_t* const src, __m128i* out) {
+static void LoadEightPixels_SSE2(const uint8_t* const src, __m128i* out) {
   const __m128i zero = _mm_setzero_si128();
   const __m128i A = _mm_loadl_epi64((const __m128i*)(src));  // ABCDEFGH
   *out = _mm_unpacklo_epi8(A, zero);
 }
 
-static void RescalerImportRowExpandSSE2(WebPRescaler* const wrk,
-                                        const uint8_t* src) {
+static void RescalerImportRowExpand_SSE2(WebPRescaler* const wrk,
+                                         const uint8_t* src) {
   rescaler_t* frow = wrk->frow;
   const rescaler_t* const frow_end = frow + wrk->dst_width * wrk->num_channels;
   const int x_add = wrk->x_add;
   int accum = x_add;
   __m128i cur_pixels;
 
+  // SSE2 implementation only works with 16b signed arithmetic at max.
+  if (wrk->src_width < 8 || accum >= (1 << 15)) {
+    WebPRescalerImportRowExpand_C(wrk, src);
+    return;
+  }
+
   assert(!WebPRescalerInputDone(wrk));
   assert(wrk->x_expand);
   if (wrk->num_channels == 4) {
-    if (wrk->src_width < 2) {
-      WebPRescalerImportRowExpandC(wrk, src);
-      return;
-    }
-    LoadTwoPixels(src, &cur_pixels);
+    LoadTwoPixels_SSE2(src, &cur_pixels);
     src += 4;
     while (1) {
       const __m128i mult = _mm_set1_epi32(((x_add - accum) << 16) | accum);
@@ -67,7 +69,7 @@ static void RescalerImportRowExpandSSE2(WebPRescaler* const wrk,
       if (frow >= frow_end) break;
       accum -= wrk->x_sub;
       if (accum < 0) {
-        LoadTwoPixels(src, &cur_pixels);
+        LoadTwoPixels_SSE2(src, &cur_pixels);
         src += 4;
         accum += x_add;
       }
@@ -75,11 +77,7 @@ static void RescalerImportRowExpandSSE2(WebPRescaler* const wrk,
   } else {
     int left;
     const uint8_t* const src_limit = src + wrk->src_width - 8;
-    if (wrk->src_width < 8) {
-      WebPRescalerImportRowExpandC(wrk, src);
-      return;
-    }
-    LoadHeightPixels(src, &cur_pixels);
+    LoadEightPixels_SSE2(src, &cur_pixels);
     src += 7;
     left = 7;
     while (1) {
@@ -94,7 +92,7 @@ static void RescalerImportRowExpandSSE2(WebPRescaler* const wrk,
         if (--left) {
           cur_pixels = _mm_srli_si128(cur_pixels, 2);
         } else if (src <= src_limit) {
-          LoadHeightPixels(src, &cur_pixels);
+          LoadEightPixels_SSE2(src, &cur_pixels);
           src += 7;
           left = 7;
         } else {   // tail
@@ -110,8 +108,8 @@ static void RescalerImportRowExpandSSE2(WebPRescaler* const wrk,
   assert(accum == 0);
 }
 
-static void RescalerImportRowShrinkSSE2(WebPRescaler* const wrk,
-                                        const uint8_t* src) {
+static void RescalerImportRowShrink_SSE2(WebPRescaler* const wrk,
+                                         const uint8_t* src) {
   const int x_sub = wrk->x_sub;
   int accum = 0;
   const __m128i zero = _mm_setzero_si128();
@@ -123,7 +121,7 @@ static void RescalerImportRowShrinkSSE2(WebPRescaler* const wrk,
   const rescaler_t* const frow_end = wrk->frow + 4 * wrk->dst_width;
 
   if (wrk->num_channels != 4 || wrk->x_add > (x_sub << 7)) {
-    WebPRescalerImportRowShrinkC(wrk, src);
+    WebPRescalerImportRowShrink_C(wrk, src);
     return;
   }
   assert(!WebPRescalerInputDone(wrk));
@@ -169,12 +167,12 @@ static void RescalerImportRowShrinkSSE2(WebPRescaler* const wrk,
 // Row export
 
 // load *src as epi64, multiply by mult and store result in [out0 ... out3]
-static WEBP_INLINE void LoadDispatchAndMult(const rescaler_t* const src,
-                                            const __m128i* const mult,
-                                            __m128i* const out0,
-                                            __m128i* const out1,
-                                            __m128i* const out2,
-                                            __m128i* const out3) {
+static WEBP_INLINE void LoadDispatchAndMult_SSE2(const rescaler_t* const src,
+                                                 const __m128i* const mult,
+                                                 __m128i* const out0,
+                                                 __m128i* const out1,
+                                                 __m128i* const out2,
+                                                 __m128i* const out3) {
   const __m128i A0 = _mm_loadu_si128((const __m128i*)(src + 0));
   const __m128i A1 = _mm_loadu_si128((const __m128i*)(src + 4));
   const __m128i A2 = _mm_srli_epi64(A0, 32);
@@ -192,12 +190,12 @@ static WEBP_INLINE void LoadDispatchAndMult(const rescaler_t* const src,
   }
 }
 
-static WEBP_INLINE void ProcessRow(const __m128i* const A0,
-                                   const __m128i* const A1,
-                                   const __m128i* const A2,
-                                   const __m128i* const A3,
-                                   const __m128i* const mult,
-                                   uint8_t* const dst) {
+static WEBP_INLINE void ProcessRow_SSE2(const __m128i* const A0,
+                                        const __m128i* const A1,
+                                        const __m128i* const A2,
+                                        const __m128i* const A3,
+                                        const __m128i* const mult,
+                                        uint8_t* const dst) {
   const __m128i rounder = _mm_set_epi32(0, ROUNDER, 0, ROUNDER);
   const __m128i mask = _mm_set_epi32(0xffffffffu, 0, 0xffffffffu, 0);
   const __m128i B0 = _mm_mul_epu32(*A0, *mult);
@@ -210,7 +208,7 @@ static WEBP_INLINE void ProcessRow(const __m128i* const A0,
   const __m128i C3 = _mm_add_epi64(B3, rounder);
   const __m128i D0 = _mm_srli_epi64(C0, WEBP_RESCALER_RFIX);
   const __m128i D1 = _mm_srli_epi64(C1, WEBP_RESCALER_RFIX);
-#if (WEBP_RESCALER_FIX < 32)
+#if (WEBP_RESCALER_RFIX < 32)
   const __m128i D2 =
       _mm_and_si128(_mm_slli_epi64(C2, 32 - WEBP_RESCALER_RFIX), mask);
   const __m128i D3 =
@@ -226,7 +224,7 @@ static WEBP_INLINE void ProcessRow(const __m128i* const A0,
   _mm_storel_epi64((__m128i*)dst, G);
 }
 
-static void RescalerExportRowExpandSSE2(WebPRescaler* const wrk) {
+static void RescalerExportRowExpand_SSE2(WebPRescaler* const wrk) {
   int x_out;
   uint8_t* const dst = wrk->dst;
   rescaler_t* const irow = wrk->irow;
@@ -240,8 +238,8 @@ static void RescalerExportRowExpandSSE2(WebPRescaler* const wrk) {
   if (wrk->y_accum == 0) {
     for (x_out = 0; x_out + 8 <= x_out_max; x_out += 8) {
       __m128i A0, A1, A2, A3;
-      LoadDispatchAndMult(frow + x_out, NULL, &A0, &A1, &A2, &A3);
-      ProcessRow(&A0, &A1, &A2, &A3, &mult, dst + x_out);
+      LoadDispatchAndMult_SSE2(frow + x_out, NULL, &A0, &A1, &A2, &A3);
+      ProcessRow_SSE2(&A0, &A1, &A2, &A3, &mult, dst + x_out);
     }
     for (; x_out < x_out_max; ++x_out) {
       const uint32_t J = frow[x_out];
@@ -257,8 +255,8 @@ static void RescalerExportRowExpandSSE2(WebPRescaler* const wrk) {
     const __m128i rounder = _mm_set_epi32(0, ROUNDER, 0, ROUNDER);
     for (x_out = 0; x_out + 8 <= x_out_max; x_out += 8) {
       __m128i A0, A1, A2, A3, B0, B1, B2, B3;
-      LoadDispatchAndMult(frow + x_out, &mA, &A0, &A1, &A2, &A3);
-      LoadDispatchAndMult(irow + x_out, &mB, &B0, &B1, &B2, &B3);
+      LoadDispatchAndMult_SSE2(frow + x_out, &mA, &A0, &A1, &A2, &A3);
+      LoadDispatchAndMult_SSE2(irow + x_out, &mB, &B0, &B1, &B2, &B3);
       {
         const __m128i C0 = _mm_add_epi64(A0, B0);
         const __m128i C1 = _mm_add_epi64(A1, B1);
@@ -272,7 +270,7 @@ static void RescalerExportRowExpandSSE2(WebPRescaler* const wrk) {
         const __m128i E1 = _mm_srli_epi64(D1, WEBP_RESCALER_RFIX);
         const __m128i E2 = _mm_srli_epi64(D2, WEBP_RESCALER_RFIX);
         const __m128i E3 = _mm_srli_epi64(D3, WEBP_RESCALER_RFIX);
-        ProcessRow(&E0, &E1, &E2, &E3, &mult, dst + x_out);
+        ProcessRow_SSE2(&E0, &E1, &E2, &E3, &mult, dst + x_out);
       }
     }
     for (; x_out < x_out_max; ++x_out) {
@@ -286,7 +284,7 @@ static void RescalerExportRowExpandSSE2(WebPRescaler* const wrk) {
   }
 }
 
-static void RescalerExportRowShrinkSSE2(WebPRescaler* const wrk) {
+static void RescalerExportRowShrink_SSE2(WebPRescaler* const wrk) {
   int x_out;
   uint8_t* const dst = wrk->dst;
   rescaler_t* const irow = wrk->irow;
@@ -303,8 +301,8 @@ static void RescalerExportRowShrinkSSE2(WebPRescaler* const wrk) {
     const __m128i rounder = _mm_set_epi32(0, ROUNDER, 0, ROUNDER);
     for (x_out = 0; x_out + 8 <= x_out_max; x_out += 8) {
       __m128i A0, A1, A2, A3, B0, B1, B2, B3;
-      LoadDispatchAndMult(irow + x_out, NULL, &A0, &A1, &A2, &A3);
-      LoadDispatchAndMult(frow + x_out, &mult_y, &B0, &B1, &B2, &B3);
+      LoadDispatchAndMult_SSE2(irow + x_out, NULL, &A0, &A1, &A2, &A3);
+      LoadDispatchAndMult_SSE2(frow + x_out, &mult_y, &B0, &B1, &B2, &B3);
       {
         const __m128i C0 = _mm_add_epi64(B0, rounder);
         const __m128i C1 = _mm_add_epi64(B1, rounder);
@@ -324,7 +322,7 @@ static void RescalerExportRowShrinkSSE2(WebPRescaler* const wrk) {
         const __m128i G1 = _mm_or_si128(D1, F3);
         _mm_storeu_si128((__m128i*)(irow + x_out + 0), G0);
         _mm_storeu_si128((__m128i*)(irow + x_out + 4), G1);
-        ProcessRow(&E0, &E1, &E2, &E3, &mult_xy, dst + x_out);
+        ProcessRow_SSE2(&E0, &E1, &E2, &E3, &mult_xy, dst + x_out);
       }
     }
     for (; x_out < x_out_max; ++x_out) {
@@ -340,10 +338,10 @@ static void RescalerExportRowShrinkSSE2(WebPRescaler* const wrk) {
     const __m128i zero = _mm_setzero_si128();
     for (x_out = 0; x_out + 8 <= x_out_max; x_out += 8) {
       __m128i A0, A1, A2, A3;
-      LoadDispatchAndMult(irow + x_out, NULL, &A0, &A1, &A2, &A3);
+      LoadDispatchAndMult_SSE2(irow + x_out, NULL, &A0, &A1, &A2, &A3);
       _mm_storeu_si128((__m128i*)(irow + x_out + 0), zero);
       _mm_storeu_si128((__m128i*)(irow + x_out + 4), zero);
-      ProcessRow(&A0, &A1, &A2, &A3, &mult, dst + x_out);
+      ProcessRow_SSE2(&A0, &A1, &A2, &A3, &mult, dst + x_out);
     }
     for (; x_out < x_out_max; ++x_out) {
       const int v = (int)MULT_FIX(irow[x_out], scale);
@@ -362,10 +360,10 @@ static void RescalerExportRowShrinkSSE2(WebPRescaler* const wrk) {
 extern void WebPRescalerDspInitSSE2(void);
 
 WEBP_TSAN_IGNORE_FUNCTION void WebPRescalerDspInitSSE2(void) {
-  WebPRescalerImportRowExpand = RescalerImportRowExpandSSE2;
-  WebPRescalerImportRowShrink = RescalerImportRowShrinkSSE2;
-  WebPRescalerExportRowExpand = RescalerExportRowExpandSSE2;
-  WebPRescalerExportRowShrink = RescalerExportRowShrinkSSE2;
+  WebPRescalerImportRowExpand = RescalerImportRowExpand_SSE2;
+  WebPRescalerImportRowShrink = RescalerImportRowShrink_SSE2;
+  WebPRescalerExportRowExpand = RescalerExportRowExpand_SSE2;
+  WebPRescalerExportRowShrink = RescalerExportRowShrink_SSE2;
 }
 
 #else  // !WEBP_USE_SSE2
diff --git a/media/libwebp/dsp/upsampling.c b/media/libwebp/dsp/upsampling.c
index 265e722c10..b76483a3a6 100644
--- a/media/libwebp/dsp/upsampling.c
+++ b/media/libwebp/dsp/upsampling.c
@@ -11,8 +11,8 @@
 //
 // Author: somnath@google.com (Somnath Banerjee)
 
-#include "./dsp.h"
-#include "./yuv.h"
+#include "../dsp/dsp.h"
+#include "../dsp/yuv.h"
 
 #include <assert.h>
 
@@ -63,17 +63,17 @@ static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bottom_y,           \
       const uint32_t uv0 = (diag_12 + tl_uv) >> 1;                             \
       const uint32_t uv1 = (diag_03 + t_uv) >> 1;                              \
       FUNC(top_y[2 * x - 1], uv0 & 0xff, (uv0 >> 16),                          \
-           top_dst + (2 * x - 1) * XSTEP);                                     \
+           top_dst + (2 * x - 1) * (XSTEP));                                   \
       FUNC(top_y[2 * x - 0], uv1 & 0xff, (uv1 >> 16),                          \
-           top_dst + (2 * x - 0) * XSTEP);                                     \
+           top_dst + (2 * x - 0) * (XSTEP));                                   \
     }                                                                          \
     if (bottom_y != NULL) {                                                    \
       const uint32_t uv0 = (diag_03 + l_uv) >> 1;                              \
       const uint32_t uv1 = (diag_12 + uv) >> 1;                                \
       FUNC(bottom_y[2 * x - 1], uv0 & 0xff, (uv0 >> 16),                       \
-           bottom_dst + (2 * x - 1) * XSTEP);                                  \
+           bottom_dst + (2 * x - 1) * (XSTEP));                                \
       FUNC(bottom_y[2 * x + 0], uv1 & 0xff, (uv1 >> 16),                       \
-           bottom_dst + (2 * x + 0) * XSTEP);                                  \
+           bottom_dst + (2 * x + 0) * (XSTEP));                                \
     }                                                                          \
     tl_uv = t_uv;                                                              \
     l_uv = uv;                                                                 \
@@ -82,24 +82,50 @@ static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bottom_y,           \
     {                                                                          \
       const uint32_t uv0 = (3 * tl_uv + l_uv + 0x00020002u) >> 2;              \
       FUNC(top_y[len - 1], uv0 & 0xff, (uv0 >> 16),                            \
-           top_dst + (len - 1) * XSTEP);                                       \
+           top_dst + (len - 1) * (XSTEP));                                     \
     }                                                                          \
     if (bottom_y != NULL) {                                                    \
       const uint32_t uv0 = (3 * l_uv + tl_uv + 0x00020002u) >> 2;              \
       FUNC(bottom_y[len - 1], uv0 & 0xff, (uv0 >> 16),                         \
-           bottom_dst + (len - 1) * XSTEP);                                    \
+           bottom_dst + (len - 1) * (XSTEP));                                  \
     }                                                                          \
   }                                                                            \
 }
 
 // All variants implemented.
-UPSAMPLE_FUNC(UpsampleRgbLinePair,  VP8YuvToRgb,  3)
-UPSAMPLE_FUNC(UpsampleBgrLinePair,  VP8YuvToBgr,  3)
-UPSAMPLE_FUNC(UpsampleRgbaLinePair, VP8YuvToRgba, 4)
-UPSAMPLE_FUNC(UpsampleBgraLinePair, VP8YuvToBgra, 4)
-UPSAMPLE_FUNC(UpsampleArgbLinePair, VP8YuvToArgb, 4)
-UPSAMPLE_FUNC(UpsampleRgba4444LinePair, VP8YuvToRgba4444, 2)
-UPSAMPLE_FUNC(UpsampleRgb565LinePair,  VP8YuvToRgb565,  2)
+#if !WEBP_NEON_OMIT_C_CODE
+UPSAMPLE_FUNC(UpsampleRgbaLinePair_C, VP8YuvToRgba, 4)
+UPSAMPLE_FUNC(UpsampleBgraLinePair_C, VP8YuvToBgra, 4)
+#if !defined(WEBP_REDUCE_CSP)
+UPSAMPLE_FUNC(UpsampleArgbLinePair_C, VP8YuvToArgb, 4)
+UPSAMPLE_FUNC(UpsampleRgbLinePair_C,  VP8YuvToRgb,  3)
+UPSAMPLE_FUNC(UpsampleBgrLinePair_C,  VP8YuvToBgr,  3)
+UPSAMPLE_FUNC(UpsampleRgba4444LinePair_C, VP8YuvToRgba4444, 2)
+UPSAMPLE_FUNC(UpsampleRgb565LinePair_C,  VP8YuvToRgb565,  2)
+#else
+static void EmptyUpsampleFunc(const uint8_t* top_y, const uint8_t* bottom_y,
+                              const uint8_t* top_u, const uint8_t* top_v,
+                              const uint8_t* cur_u, const uint8_t* cur_v,
+                              uint8_t* top_dst, uint8_t* bottom_dst, int len) {
+  (void)top_y;
+  (void)bottom_y;
+  (void)top_u;
+  (void)top_v;
+  (void)cur_u;
+  (void)cur_v;
+  (void)top_dst;
+  (void)bottom_dst;
+  (void)len;
+  assert(0);   // COLORSPACE SUPPORT NOT COMPILED
+}
+#define UpsampleArgbLinePair_C EmptyUpsampleFunc
+#define UpsampleRgbLinePair_C EmptyUpsampleFunc
+#define UpsampleBgrLinePair_C EmptyUpsampleFunc
+#define UpsampleRgba4444LinePair_C EmptyUpsampleFunc
+#define UpsampleRgb565LinePair_C EmptyUpsampleFunc
+#endif   // WEBP_REDUCE_CSP
+
+#endif
 
 #undef LOAD_UV
 #undef UPSAMPLE_FUNC
@@ -141,7 +167,6 @@ DUAL_SAMPLE_FUNC(DualLineSamplerARGB, VP8YuvToArgb)
 
 WebPUpsampleLinePairFunc WebPGetLinePairConverter(int alpha_is_last) {
   WebPInitUpsamplers();
-  VP8YUVInit();
 #ifdef FANCY_UPSAMPLING
   return WebPUpsamplers[alpha_is_last ? MODE_BGRA : MODE_ARGB];
 #else
@@ -158,16 +183,33 @@ extern void FUNC_NAME(const uint8_t* y, const uint8_t* u, const uint8_t* v,    \
 void FUNC_NAME(const uint8_t* y, const uint8_t* u, const uint8_t* v,           \
                uint8_t* dst, int len) {                                        \
   int i;                                                                       \
-  for (i = 0; i < len; ++i) FUNC(y[i], u[i], v[i], &dst[i * XSTEP]);           \
+  for (i = 0; i < len; ++i) FUNC(y[i], u[i], v[i], &dst[i * (XSTEP)]);         \
 }
 
-YUV444_FUNC(WebPYuv444ToRgbC,      VP8YuvToRgb,  3)
-YUV444_FUNC(WebPYuv444ToBgrC,      VP8YuvToBgr,  3)
-YUV444_FUNC(WebPYuv444ToRgbaC,     VP8YuvToRgba, 4)
-YUV444_FUNC(WebPYuv444ToBgraC,     VP8YuvToBgra, 4)
-YUV444_FUNC(WebPYuv444ToArgbC,     VP8YuvToArgb, 4)
-YUV444_FUNC(WebPYuv444ToRgba4444C, VP8YuvToRgba4444, 2)
-YUV444_FUNC(WebPYuv444ToRgb565C,   VP8YuvToRgb565, 2)
+YUV444_FUNC(WebPYuv444ToRgba_C,     VP8YuvToRgba, 4)
+YUV444_FUNC(WebPYuv444ToBgra_C,     VP8YuvToBgra, 4)
+#if !defined(WEBP_REDUCE_CSP)
+YUV444_FUNC(WebPYuv444ToRgb_C,      VP8YuvToRgb,  3)
+YUV444_FUNC(WebPYuv444ToBgr_C,      VP8YuvToBgr,  3)
+YUV444_FUNC(WebPYuv444ToArgb_C,     VP8YuvToArgb, 4)
+YUV444_FUNC(WebPYuv444ToRgba4444_C, VP8YuvToRgba4444, 2)
+YUV444_FUNC(WebPYuv444ToRgb565_C,   VP8YuvToRgb565, 2)
+#else
+static void EmptyYuv444Func(const uint8_t* y,
+                            const uint8_t* u, const uint8_t* v,
+                            uint8_t* dst, int len) {
+  (void)y;
+  (void)u;
+  (void)v;
+  (void)dst;
+  (void)len;
+}
+#define WebPYuv444ToRgb_C EmptyYuv444Func
+#define WebPYuv444ToBgr_C EmptyYuv444Func
+#define WebPYuv444ToArgb_C EmptyYuv444Func
+#define WebPYuv444ToRgba4444_C EmptyYuv444Func
+#define WebPYuv444ToRgb565_C EmptyYuv444Func
+#endif   // WEBP_REDUCE_CSP
 
 #undef YUV444_FUNC
 
@@ -175,24 +217,20 @@ WebPYUV444Converter WebPYUV444Converters[MODE_LAST];
 
 extern void WebPInitYUV444ConvertersMIPSdspR2(void);
 extern void WebPInitYUV444ConvertersSSE2(void);
-
-static volatile VP8CPUInfo upsampling_last_cpuinfo_used1 =
-    (VP8CPUInfo)&upsampling_last_cpuinfo_used1;
-
-WEBP_TSAN_IGNORE_FUNCTION void WebPInitYUV444Converters(void) {
-  if (upsampling_last_cpuinfo_used1 == VP8GetCPUInfo) return;
-
-  WebPYUV444Converters[MODE_RGB]       = WebPYuv444ToRgbC;
-  WebPYUV444Converters[MODE_RGBA]      = WebPYuv444ToRgbaC;
-  WebPYUV444Converters[MODE_BGR]       = WebPYuv444ToBgrC;
-  WebPYUV444Converters[MODE_BGRA]      = WebPYuv444ToBgraC;
-  WebPYUV444Converters[MODE_ARGB]      = WebPYuv444ToArgbC;
-  WebPYUV444Converters[MODE_RGBA_4444] = WebPYuv444ToRgba4444C;
-  WebPYUV444Converters[MODE_RGB_565]   = WebPYuv444ToRgb565C;
-  WebPYUV444Converters[MODE_rgbA]      = WebPYuv444ToRgbaC;
-  WebPYUV444Converters[MODE_bgrA]      = WebPYuv444ToBgraC;
-  WebPYUV444Converters[MODE_Argb]      = WebPYuv444ToArgbC;
-  WebPYUV444Converters[MODE_rgbA_4444] = WebPYuv444ToRgba4444C;
+extern void WebPInitYUV444ConvertersSSE41(void);
+
+WEBP_DSP_INIT_FUNC(WebPInitYUV444Converters) {
+  WebPYUV444Converters[MODE_RGBA]      = WebPYuv444ToRgba_C;
+  WebPYUV444Converters[MODE_BGRA]      = WebPYuv444ToBgra_C;
+  WebPYUV444Converters[MODE_RGB]       = WebPYuv444ToRgb_C;
+  WebPYUV444Converters[MODE_BGR]       = WebPYuv444ToBgr_C;
+  WebPYUV444Converters[MODE_ARGB]      = WebPYuv444ToArgb_C;
+  WebPYUV444Converters[MODE_RGBA_4444] = WebPYuv444ToRgba4444_C;
+  WebPYUV444Converters[MODE_RGB_565]   = WebPYuv444ToRgb565_C;
+  WebPYUV444Converters[MODE_rgbA]      = WebPYuv444ToRgba_C;
+  WebPYUV444Converters[MODE_bgrA]      = WebPYuv444ToBgra_C;
+  WebPYUV444Converters[MODE_Argb]      = WebPYuv444ToArgb_C;
+  WebPYUV444Converters[MODE_rgbA_4444] = WebPYuv444ToRgba4444_C;
 
   if (VP8GetCPUInfo != NULL) {
 #if defined(WEBP_USE_SSE2)
@@ -200,41 +238,43 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitYUV444Converters(void) {
       WebPInitYUV444ConvertersSSE2();
     }
 #endif
+#if defined(WEBP_USE_SSE41)
+    if (VP8GetCPUInfo(kSSE4_1)) {
+      WebPInitYUV444ConvertersSSE41();
+    }
+#endif
 #if defined(WEBP_USE_MIPS_DSP_R2)
     if (VP8GetCPUInfo(kMIPSdspR2)) {
       WebPInitYUV444ConvertersMIPSdspR2();
     }
 #endif
   }
-  upsampling_last_cpuinfo_used1 = VP8GetCPUInfo;
 }
 
 //------------------------------------------------------------------------------
 // Main calls
 
 extern void WebPInitUpsamplersSSE2(void);
+extern void WebPInitUpsamplersSSE41(void);
 extern void WebPInitUpsamplersNEON(void);
 extern void WebPInitUpsamplersMIPSdspR2(void);
 extern void WebPInitUpsamplersMSA(void);
 
-static volatile VP8CPUInfo upsampling_last_cpuinfo_used2 =
-    (VP8CPUInfo)&upsampling_last_cpuinfo_used2;
-
-WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplers(void) {
-  if (upsampling_last_cpuinfo_used2 == VP8GetCPUInfo) return;
-
+WEBP_DSP_INIT_FUNC(WebPInitUpsamplers) {
 #ifdef FANCY_UPSAMPLING
-  WebPUpsamplers[MODE_RGB]       = UpsampleRgbLinePair;
-  WebPUpsamplers[MODE_RGBA]      = UpsampleRgbaLinePair;
-  WebPUpsamplers[MODE_BGR]       = UpsampleBgrLinePair;
-  WebPUpsamplers[MODE_BGRA]      = UpsampleBgraLinePair;
-  WebPUpsamplers[MODE_ARGB]      = UpsampleArgbLinePair;
-  WebPUpsamplers[MODE_RGBA_4444] = UpsampleRgba4444LinePair;
-  WebPUpsamplers[MODE_RGB_565]   = UpsampleRgb565LinePair;
-  WebPUpsamplers[MODE_rgbA]      = UpsampleRgbaLinePair;
-  WebPUpsamplers[MODE_bgrA]      = UpsampleBgraLinePair;
-  WebPUpsamplers[MODE_Argb]      = UpsampleArgbLinePair;
-  WebPUpsamplers[MODE_rgbA_4444] = UpsampleRgba4444LinePair;
+#if !WEBP_NEON_OMIT_C_CODE
+  WebPUpsamplers[MODE_RGBA]      = UpsampleRgbaLinePair_C;
+  WebPUpsamplers[MODE_BGRA]      = UpsampleBgraLinePair_C;
+  WebPUpsamplers[MODE_rgbA]      = UpsampleRgbaLinePair_C;
+  WebPUpsamplers[MODE_bgrA]      = UpsampleBgraLinePair_C;
+  WebPUpsamplers[MODE_RGB]       = UpsampleRgbLinePair_C;
+  WebPUpsamplers[MODE_BGR]       = UpsampleBgrLinePair_C;
+  WebPUpsamplers[MODE_ARGB]      = UpsampleArgbLinePair_C;
+  WebPUpsamplers[MODE_RGBA_4444] = UpsampleRgba4444LinePair_C;
+  WebPUpsamplers[MODE_RGB_565]   = UpsampleRgb565LinePair_C;
+  WebPUpsamplers[MODE_Argb]      = UpsampleArgbLinePair_C;
+  WebPUpsamplers[MODE_rgbA_4444] = UpsampleRgba4444LinePair_C;
+#endif
 
   // If defined, use CPUInfo() to overwrite some pointers with faster versions.
   if (VP8GetCPUInfo != NULL) {
@@ -243,9 +283,9 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplers(void) {
       WebPInitUpsamplersSSE2();
     }
 #endif
-#if defined(WEBP_USE_NEON)
-    if (VP8GetCPUInfo(kNEON)) {
-      WebPInitUpsamplersNEON();
+#if defined(WEBP_USE_SSE41)
+    if (VP8GetCPUInfo(kSSE4_1)) {
+      WebPInitUpsamplersSSE41();
     }
 #endif
 #if defined(WEBP_USE_MIPS_DSP_R2)
@@ -259,8 +299,29 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplers(void) {
     }
 #endif
   }
+
+#if defined(WEBP_USE_NEON)
+  if (WEBP_NEON_OMIT_C_CODE ||
+      (VP8GetCPUInfo != NULL && VP8GetCPUInfo(kNEON))) {
+    WebPInitUpsamplersNEON();
+  }
+#endif
+
+  assert(WebPUpsamplers[MODE_RGBA] != NULL);
+  assert(WebPUpsamplers[MODE_BGRA] != NULL);
+  assert(WebPUpsamplers[MODE_rgbA] != NULL);
+  assert(WebPUpsamplers[MODE_bgrA] != NULL);
+#if !defined(WEBP_REDUCE_CSP) || !WEBP_NEON_OMIT_C_CODE
+  assert(WebPUpsamplers[MODE_RGB] != NULL);
+  assert(WebPUpsamplers[MODE_BGR] != NULL);
+  assert(WebPUpsamplers[MODE_ARGB] != NULL);
+  assert(WebPUpsamplers[MODE_RGBA_4444] != NULL);
+  assert(WebPUpsamplers[MODE_RGB_565] != NULL);
+  assert(WebPUpsamplers[MODE_Argb] != NULL);
+  assert(WebPUpsamplers[MODE_rgbA_4444] != NULL);
+#endif
+
 #endif  // FANCY_UPSAMPLING
-  upsampling_last_cpuinfo_used2 = VP8GetCPUInfo;
 }
 
 //------------------------------------------------------------------------------
diff --git a/media/libwebp/dsp/upsampling_neon.c b/media/libwebp/dsp/upsampling_neon.c
index d371a834ff..c847d70d46 100644
--- a/media/libwebp/dsp/upsampling_neon.c
+++ b/media/libwebp/dsp/upsampling_neon.c
@@ -12,15 +12,15 @@
 // Author: mans@mansr.com (Mans Rullgard)
 // Based on SSE code by: somnath@google.com (Somnath Banerjee)
 
-#include "./dsp.h"
+#include "../dsp/dsp.h"
 
 #if defined(WEBP_USE_NEON)
 
 #include <assert.h>
 #include <arm_neon.h>
 #include <string.h>
-#include "./neon.h"
-#include "./yuv.h"
+#include "../dsp/neon.h"
+#include "../dsp/yuv.h"
 
 #ifdef FANCY_UPSAMPLING
 
@@ -58,8 +58,8 @@
 } while (0)
 
 // Turn the macro into a function for reducing code-size when non-critical
-static void Upsample16Pixels(const uint8_t *r1, const uint8_t *r2,
-                             uint8_t *out) {
+static void Upsample16Pixels_NEON(const uint8_t *r1, const uint8_t *r2,
+                                  uint8_t *out) {
   UPSAMPLE_16PIXELS(r1, r2, out);
 }
 
@@ -70,7 +70,7 @@ static void Upsample16Pixels(const uint8_t *r1, const uint8_t *r2,
   /* replicate last byte */                                             \
   memset(r1 + (num_pixels), r1[(num_pixels) - 1], 9 - (num_pixels));    \
   memset(r2 + (num_pixels), r2[(num_pixels) - 1], 9 - (num_pixels));    \
-  Upsample16Pixels(r1, r2, out);                                        \
+  Upsample16Pixels_NEON(r1, r2, out);                                   \
 }
 
 //-----------------------------------------------------------------------------
@@ -243,13 +243,15 @@ static void FUNC_NAME(const uint8_t *top_y, const uint8_t *bottom_y,    \
 }
 
 // NEON variants of the fancy upsampler.
-NEON_UPSAMPLE_FUNC(UpsampleRgbLinePair,  Rgb,  3)
-NEON_UPSAMPLE_FUNC(UpsampleBgrLinePair,  Bgr,  3)
-NEON_UPSAMPLE_FUNC(UpsampleRgbaLinePair, Rgba, 4)
-NEON_UPSAMPLE_FUNC(UpsampleBgraLinePair, Bgra, 4)
-NEON_UPSAMPLE_FUNC(UpsampleArgbLinePair, Argb, 4)
-NEON_UPSAMPLE_FUNC(UpsampleRgba4444LinePair, Rgba4444, 2)
-NEON_UPSAMPLE_FUNC(UpsampleRgb565LinePair, Rgb565, 2)
+NEON_UPSAMPLE_FUNC(UpsampleRgbaLinePair_NEON, Rgba, 4)
+NEON_UPSAMPLE_FUNC(UpsampleBgraLinePair_NEON, Bgra, 4)
+#if !defined(WEBP_REDUCE_CSP)
+NEON_UPSAMPLE_FUNC(UpsampleRgbLinePair_NEON,  Rgb,  3)
+NEON_UPSAMPLE_FUNC(UpsampleBgrLinePair_NEON,  Bgr,  3)
+NEON_UPSAMPLE_FUNC(UpsampleArgbLinePair_NEON, Argb, 4)
+NEON_UPSAMPLE_FUNC(UpsampleRgba4444LinePair_NEON, Rgba4444, 2)
+NEON_UPSAMPLE_FUNC(UpsampleRgb565LinePair_NEON, Rgb565, 2)
+#endif   // WEBP_REDUCE_CSP
 
 //------------------------------------------------------------------------------
 // Entry point
@@ -259,17 +261,19 @@ extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */];
 extern void WebPInitUpsamplersNEON(void);
 
 WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplersNEON(void) {
-  WebPUpsamplers[MODE_RGB]  = UpsampleRgbLinePair;
-  WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePair;
-  WebPUpsamplers[MODE_BGR]  = UpsampleBgrLinePair;
-  WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePair;
-  WebPUpsamplers[MODE_ARGB] = UpsampleArgbLinePair;
-  WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePair;
-  WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePair;
-  WebPUpsamplers[MODE_Argb] = UpsampleArgbLinePair;
-  WebPUpsamplers[MODE_RGB_565] = UpsampleRgb565LinePair;
-  WebPUpsamplers[MODE_RGBA_4444] = UpsampleRgba4444LinePair;
-  WebPUpsamplers[MODE_rgbA_4444] = UpsampleRgba4444LinePair;
+  WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePair_NEON;
+  WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePair_NEON;
+  WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePair_NEON;
+  WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePair_NEON;
+#if !defined(WEBP_REDUCE_CSP)
+  WebPUpsamplers[MODE_RGB]  = UpsampleRgbLinePair_NEON;
+  WebPUpsamplers[MODE_BGR]  = UpsampleBgrLinePair_NEON;
+  WebPUpsamplers[MODE_ARGB] = UpsampleArgbLinePair_NEON;
+  WebPUpsamplers[MODE_Argb] = UpsampleArgbLinePair_NEON;
+  WebPUpsamplers[MODE_RGB_565] = UpsampleRgb565LinePair_NEON;
+  WebPUpsamplers[MODE_RGBA_4444] = UpsampleRgba4444LinePair_NEON;
+  WebPUpsamplers[MODE_rgbA_4444] = UpsampleRgba4444LinePair_NEON;
+#endif   // WEBP_REDUCE_CSP
 }
 
 #endif  // FANCY_UPSAMPLING
diff --git a/media/libwebp/dsp/upsampling_sse2.c b/media/libwebp/dsp/upsampling_sse2.c
index b5b668900f..fd23681cae 100644
--- a/media/libwebp/dsp/upsampling_sse2.c
+++ b/media/libwebp/dsp/upsampling_sse2.c
@@ -11,14 +11,14 @@
 //
 // Author: somnath@google.com (Somnath Banerjee)
 
-#include "./dsp.h"
+#include "../dsp/dsp.h"
 
 #if defined(WEBP_USE_SSE2)
 
 #include <assert.h>
 #include <emmintrin.h>
 #include <string.h>
-#include "./yuv.h"
+#include "../dsp/yuv.h"
 
 #ifdef FANCY_UPSAMPLING
 
@@ -83,13 +83,13 @@
   GET_M(ad, s, diag2);                  /* diag2 = (3a + b + c + 3d) / 8 */    \
                                                                                \
   /* pack the alternate pixels */                                              \
-  PACK_AND_STORE(a, b, diag1, diag2, out +      0);  /* store top */           \
-  PACK_AND_STORE(c, d, diag2, diag1, out + 2 * 32);  /* store bottom */        \
+  PACK_AND_STORE(a, b, diag1, diag2, (out) +      0);  /* store top */         \
+  PACK_AND_STORE(c, d, diag2, diag1, (out) + 2 * 32);  /* store bottom */      \
 }
 
 // Turn the macro into a function for reducing code-size when non-critical
-static void Upsample32Pixels(const uint8_t r1[], const uint8_t r2[],
-                             uint8_t* const out) {
+static void Upsample32Pixels_SSE2(const uint8_t r1[], const uint8_t r2[],
+                                  uint8_t* const out) {
   UPSAMPLE_32PIXELS(r1, r2, out);
 }
 
@@ -101,30 +101,15 @@ static void Upsample32Pixels(const uint8_t r1[], const uint8_t r2[],
   memset(r1 + (num_pixels), r1[(num_pixels) - 1], 17 - (num_pixels));          \
   memset(r2 + (num_pixels), r2[(num_pixels) - 1], 17 - (num_pixels));          \
   /* using the shared function instead of the macro saves ~3k code size */     \
-  Upsample32Pixels(r1, r2, out);                                               \
-}
-
-#define CONVERT2RGB(FUNC, XSTEP, top_y, bottom_y,                              \
-                    top_dst, bottom_dst, cur_x, num_pixels) {                  \
-  int n;                                                                       \
-  for (n = 0; n < (num_pixels); ++n) {                                         \
-    FUNC(top_y[(cur_x) + n], r_u[n], r_v[n],                                   \
-         top_dst + ((cur_x) + n) * XSTEP);                                     \
-  }                                                                            \
-  if (bottom_y != NULL) {                                                      \
-    for (n = 0; n < (num_pixels); ++n) {                                       \
-      FUNC(bottom_y[(cur_x) + n], r_u[64 + n], r_v[64 + n],                    \
-           bottom_dst + ((cur_x) + n) * XSTEP);                                \
-    }                                                                          \
-  }                                                                            \
+  Upsample32Pixels_SSE2(r1, r2, out);                                          \
 }
 
 #define CONVERT2RGB_32(FUNC, XSTEP, top_y, bottom_y,                           \
                        top_dst, bottom_dst, cur_x) do {                        \
-  FUNC##32(top_y + (cur_x), r_u, r_v, top_dst + (cur_x) * XSTEP);              \
-  if (bottom_y != NULL) {                                                      \
-    FUNC##32(bottom_y + (cur_x), r_u + 64, r_v + 64,                           \
-             bottom_dst + (cur_x) * XSTEP);                                    \
+  FUNC##32_SSE2((top_y) + (cur_x), r_u, r_v, (top_dst) + (cur_x) * (XSTEP));   \
+  if ((bottom_y) != NULL) {                                                    \
+    FUNC##32_SSE2((bottom_y) + (cur_x), r_u + 64, r_v + 64,                    \
+                  (bottom_dst) + (cur_x) * (XSTEP));                           \
   }                                                                            \
 } while (0)
 
@@ -135,7 +120,7 @@ static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bottom_y,           \
                       uint8_t* top_dst, uint8_t* bottom_dst, int len) {        \
   int uv_pos, pos;                                                             \
   /* 16byte-aligned array to cache reconstructed u and v */                    \
-  uint8_t uv_buf[4 * 32 + 15];                                                 \
+  uint8_t uv_buf[14 * 32 + 15] = { 0 };                                        \
   uint8_t* const r_u = (uint8_t*)((uintptr_t)(uv_buf + 15) & ~15);             \
   uint8_t* const r_v = r_u + 32;                                               \
                                                                                \
@@ -160,22 +145,36 @@ static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bottom_y,           \
   }                                                                            \
   if (len > 1) {                                                               \
     const int left_over = ((len + 1) >> 1) - (pos >> 1);                       \
+    uint8_t* const tmp_top_dst = r_u + 4 * 32;                                 \
+    uint8_t* const tmp_bottom_dst = tmp_top_dst + 4 * 32;                      \
+    uint8_t* const tmp_top = tmp_bottom_dst + 4 * 32;                          \
+    uint8_t* const tmp_bottom = (bottom_y == NULL) ? NULL : tmp_top + 32;      \
     assert(left_over > 0);                                                     \
     UPSAMPLE_LAST_BLOCK(top_u + uv_pos, cur_u + uv_pos, left_over, r_u);       \
     UPSAMPLE_LAST_BLOCK(top_v + uv_pos, cur_v + uv_pos, left_over, r_v);       \
-    CONVERT2RGB(FUNC, XSTEP, top_y, bottom_y, top_dst, bottom_dst,             \
-                pos, len - pos);                                               \
+    memcpy(tmp_top, top_y + pos, len - pos);                                   \
+    if (bottom_y != NULL) memcpy(tmp_bottom, bottom_y + pos, len - pos);       \
+    CONVERT2RGB_32(FUNC, XSTEP, tmp_top, tmp_bottom, tmp_top_dst,              \
+         tmp_bottom_dst, 0);                                                   \
+    memcpy(top_dst + pos * (XSTEP), tmp_top_dst, (len - pos) * (XSTEP));       \
+    if (bottom_y != NULL) {                                                    \
+      memcpy(bottom_dst + pos * (XSTEP), tmp_bottom_dst,                       \
+             (len - pos) * (XSTEP));                                           \
+    }                                                                          \
   }                                                                            \
 }
 
 // SSE2 variants of the fancy upsampler.
-SSE2_UPSAMPLE_FUNC(UpsampleRgbLinePair,  VP8YuvToRgb,  3)
-SSE2_UPSAMPLE_FUNC(UpsampleBgrLinePair,  VP8YuvToBgr,  3)
-SSE2_UPSAMPLE_FUNC(UpsampleRgbaLinePair, VP8YuvToRgba, 4)
-SSE2_UPSAMPLE_FUNC(UpsampleBgraLinePair, VP8YuvToBgra, 4)
-SSE2_UPSAMPLE_FUNC(UpsampleArgbLinePair, VP8YuvToArgb, 4)
-SSE2_UPSAMPLE_FUNC(UpsampleRgba4444LinePair, VP8YuvToRgba4444, 2)
-SSE2_UPSAMPLE_FUNC(UpsampleRgb565LinePair, VP8YuvToRgb565, 2)
+SSE2_UPSAMPLE_FUNC(UpsampleRgbaLinePair_SSE2, VP8YuvToRgba, 4)
+SSE2_UPSAMPLE_FUNC(UpsampleBgraLinePair_SSE2, VP8YuvToBgra, 4)
+
+#if !defined(WEBP_REDUCE_CSP)
+SSE2_UPSAMPLE_FUNC(UpsampleRgbLinePair_SSE2,  VP8YuvToRgb,  3)
+SSE2_UPSAMPLE_FUNC(UpsampleBgrLinePair_SSE2,  VP8YuvToBgr,  3)
+SSE2_UPSAMPLE_FUNC(UpsampleArgbLinePair_SSE2, VP8YuvToArgb, 4)
+SSE2_UPSAMPLE_FUNC(UpsampleRgba4444LinePair_SSE2, VP8YuvToRgba4444, 2)
+SSE2_UPSAMPLE_FUNC(UpsampleRgb565LinePair_SSE2, VP8YuvToRgb565, 2)
+#endif   // WEBP_REDUCE_CSP
 
 #undef GET_M
 #undef PACK_AND_STORE
@@ -193,17 +192,19 @@ extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */];
 extern void WebPInitUpsamplersSSE2(void);
 
 WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplersSSE2(void) {
-  WebPUpsamplers[MODE_RGB]  = UpsampleRgbLinePair;
-  WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePair;
-  WebPUpsamplers[MODE_BGR]  = UpsampleBgrLinePair;
-  WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePair;
-  WebPUpsamplers[MODE_ARGB] = UpsampleArgbLinePair;
-  WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePair;
-  WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePair;
-  WebPUpsamplers[MODE_Argb] = UpsampleArgbLinePair;
-  WebPUpsamplers[MODE_RGB_565] = UpsampleRgb565LinePair;
-  WebPUpsamplers[MODE_RGBA_4444] = UpsampleRgba4444LinePair;
-  WebPUpsamplers[MODE_rgbA_4444] = UpsampleRgba4444LinePair;
+  WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePair_SSE2;
+  WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePair_SSE2;
+  WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePair_SSE2;
+  WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePair_SSE2;
+#if !defined(WEBP_REDUCE_CSP)
+  WebPUpsamplers[MODE_RGB]  = UpsampleRgbLinePair_SSE2;
+  WebPUpsamplers[MODE_BGR]  = UpsampleBgrLinePair_SSE2;
+  WebPUpsamplers[MODE_ARGB] = UpsampleArgbLinePair_SSE2;
+  WebPUpsamplers[MODE_Argb] = UpsampleArgbLinePair_SSE2;
+  WebPUpsamplers[MODE_RGB_565] = UpsampleRgb565LinePair_SSE2;
+  WebPUpsamplers[MODE_RGBA_4444] = UpsampleRgba4444LinePair_SSE2;
+  WebPUpsamplers[MODE_rgbA_4444] = UpsampleRgba4444LinePair_SSE2;
+#endif   // WEBP_REDUCE_CSP
 }
 
 #endif  // FANCY_UPSAMPLING
@@ -213,29 +214,46 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplersSSE2(void) {
 extern WebPYUV444Converter WebPYUV444Converters[/* MODE_LAST */];
 extern void WebPInitYUV444ConvertersSSE2(void);
 
-#define YUV444_FUNC(FUNC_NAME, CALL, XSTEP) \
-extern void WebP##FUNC_NAME##C(const uint8_t* y, const uint8_t* u,             \
-                               const uint8_t* v, uint8_t* dst, int len);       \
+#define YUV444_FUNC(FUNC_NAME, CALL, CALL_C, XSTEP)                            \
+extern void CALL_C(const uint8_t* y, const uint8_t* u, const uint8_t* v,       \
+                   uint8_t* dst, int len);                                     \
 static void FUNC_NAME(const uint8_t* y, const uint8_t* u, const uint8_t* v,    \
                       uint8_t* dst, int len) {                                 \
   int i;                                                                       \
   const int max_len = len & ~31;                                               \
-  for (i = 0; i < max_len; i += 32) CALL(y + i, u + i, v + i, dst + i * XSTEP);\
+  for (i = 0; i < max_len; i += 32) {                                          \
+    CALL(y + i, u + i, v + i, dst + i * (XSTEP));                              \
+  }                                                                            \
   if (i < len) {  /* C-fallback */                                             \
-    WebP##FUNC_NAME##C(y + i, u + i, v + i, dst + i * XSTEP, len - i);         \
+    CALL_C(y + i, u + i, v + i, dst + i * (XSTEP), len - i);                   \
   }                                                                            \
 }
 
-YUV444_FUNC(Yuv444ToRgba, VP8YuvToRgba32, 4);
-YUV444_FUNC(Yuv444ToBgra, VP8YuvToBgra32, 4);
-YUV444_FUNC(Yuv444ToRgb, VP8YuvToRgb32, 3);
-YUV444_FUNC(Yuv444ToBgr, VP8YuvToBgr32, 3);
+YUV444_FUNC(Yuv444ToRgba_SSE2, VP8YuvToRgba32_SSE2, WebPYuv444ToRgba_C, 4);
+YUV444_FUNC(Yuv444ToBgra_SSE2, VP8YuvToBgra32_SSE2, WebPYuv444ToBgra_C, 4);
+#if !defined(WEBP_REDUCE_CSP)
+YUV444_FUNC(Yuv444ToRgb_SSE2, VP8YuvToRgb32_SSE2, WebPYuv444ToRgb_C, 3);
+YUV444_FUNC(Yuv444ToBgr_SSE2, VP8YuvToBgr32_SSE2, WebPYuv444ToBgr_C, 3);
+YUV444_FUNC(Yuv444ToArgb_SSE2, VP8YuvToArgb32_SSE2, WebPYuv444ToArgb_C, 4)
+YUV444_FUNC(Yuv444ToRgba4444_SSE2, VP8YuvToRgba444432_SSE2, \
+            WebPYuv444ToRgba4444_C, 2)
+YUV444_FUNC(Yuv444ToRgb565_SSE2, VP8YuvToRgb56532_SSE2, WebPYuv444ToRgb565_C, 2)
+#endif   // WEBP_REDUCE_CSP
 
 WEBP_TSAN_IGNORE_FUNCTION void WebPInitYUV444ConvertersSSE2(void) {
-  WebPYUV444Converters[MODE_RGBA] = Yuv444ToRgba;
-  WebPYUV444Converters[MODE_BGRA] = Yuv444ToBgra;
-  WebPYUV444Converters[MODE_RGB]  = Yuv444ToRgb;
-  WebPYUV444Converters[MODE_BGR]  = Yuv444ToBgr;
+  WebPYUV444Converters[MODE_RGBA]      = Yuv444ToRgba_SSE2;
+  WebPYUV444Converters[MODE_BGRA]      = Yuv444ToBgra_SSE2;
+  WebPYUV444Converters[MODE_rgbA]      = Yuv444ToRgba_SSE2;
+  WebPYUV444Converters[MODE_bgrA]      = Yuv444ToBgra_SSE2;
+#if !defined(WEBP_REDUCE_CSP)
+  WebPYUV444Converters[MODE_RGB]       = Yuv444ToRgb_SSE2;
+  WebPYUV444Converters[MODE_BGR]       = Yuv444ToBgr_SSE2;
+  WebPYUV444Converters[MODE_ARGB]      = Yuv444ToArgb_SSE2;
+  WebPYUV444Converters[MODE_RGBA_4444] = Yuv444ToRgba4444_SSE2;
+  WebPYUV444Converters[MODE_RGB_565]   = Yuv444ToRgb565_SSE2;
+  WebPYUV444Converters[MODE_Argb]      = Yuv444ToArgb_SSE2;
+  WebPYUV444Converters[MODE_rgbA_4444] = Yuv444ToRgba4444_SSE2;
+#endif   // WEBP_REDUCE_CSP
 }
 
 #else
diff --git a/media/libwebp/dsp/upsampling_sse41.c b/media/libwebp/dsp/upsampling_sse41.c
new file mode 100644
index 0000000000..65d175e87d
--- /dev/null
+++ b/media/libwebp/dsp/upsampling_sse41.c
@@ -0,0 +1,239 @@
+// Copyright 2011 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+// SSE41 version of YUV to RGB upsampling functions.
+//
+// Author: somnath@google.com (Somnath Banerjee)
+
+#include "../dsp/dsp.h"
+
+#if defined(WEBP_USE_SSE41)
+
+#include <assert.h>
+#include <smmintrin.h>
+#include <string.h>
+#include "../dsp/yuv.h"
+
+#ifdef FANCY_UPSAMPLING
+
+#if !defined(WEBP_REDUCE_CSP)
+
+// We compute (9*a + 3*b + 3*c + d + 8) / 16 as follows
+// u = (9*a + 3*b + 3*c + d + 8) / 16
+//   = (a + (a + 3*b + 3*c + d) / 8 + 1) / 2
+//   = (a + m + 1) / 2
+// where m = (a + 3*b + 3*c + d) / 8
+//         = ((a + b + c + d) / 2 + b + c) / 4
+//
+// Let's say  k = (a + b + c + d) / 4.
+// We can compute k as
+// k = (s + t + 1) / 2 - ((a^d) | (b^c) | (s^t)) & 1
+// where s = (a + d + 1) / 2 and t = (b + c + 1) / 2
+//
+// Then m can be written as
+// m = (k + t + 1) / 2 - (((b^c) & (s^t)) | (k^t)) & 1
+
+// Computes out = (k + in + 1) / 2 - ((ij & (s^t)) | (k^in)) & 1
+#define GET_M(ij, in, out) do {                                                \
+  const __m128i tmp0 = _mm_avg_epu8(k, (in));     /* (k + in + 1) / 2 */       \
+  const __m128i tmp1 = _mm_and_si128((ij), st);   /* (ij) & (s^t) */           \
+  const __m128i tmp2 = _mm_xor_si128(k, (in));    /* (k^in) */                 \
+  const __m128i tmp3 = _mm_or_si128(tmp1, tmp2);  /* ((ij) & (s^t)) | (k^in) */\
+  const __m128i tmp4 = _mm_and_si128(tmp3, one);  /* & 1 -> lsb_correction */  \
+  (out) = _mm_sub_epi8(tmp0, tmp4);    /* (k + in + 1) / 2 - lsb_correction */ \
+} while (0)
+
+// pack and store two alternating pixel rows
+#define PACK_AND_STORE(a, b, da, db, out) do {                                 \
+  const __m128i t_a = _mm_avg_epu8(a, da);  /* (9a + 3b + 3c +  d + 8) / 16 */ \
+  const __m128i t_b = _mm_avg_epu8(b, db);  /* (3a + 9b +  c + 3d + 8) / 16 */ \
+  const __m128i t_1 = _mm_unpacklo_epi8(t_a, t_b);                             \
+  const __m128i t_2 = _mm_unpackhi_epi8(t_a, t_b);                             \
+  _mm_store_si128(((__m128i*)(out)) + 0, t_1);                                 \
+  _mm_store_si128(((__m128i*)(out)) + 1, t_2);                                 \
+} while (0)
+
+// Loads 17 pixels each from rows r1 and r2 and generates 32 pixels.
+#define UPSAMPLE_32PIXELS(r1, r2, out) {                                       \
+  const __m128i one = _mm_set1_epi8(1);                                        \
+  const __m128i a = _mm_loadu_si128((const __m128i*)&(r1)[0]);                 \
+  const __m128i b = _mm_loadu_si128((const __m128i*)&(r1)[1]);                 \
+  const __m128i c = _mm_loadu_si128((const __m128i*)&(r2)[0]);                 \
+  const __m128i d = _mm_loadu_si128((const __m128i*)&(r2)[1]);                 \
+                                                                               \
+  const __m128i s = _mm_avg_epu8(a, d);        /* s = (a + d + 1) / 2 */       \
+  const __m128i t = _mm_avg_epu8(b, c);        /* t = (b + c + 1) / 2 */       \
+  const __m128i st = _mm_xor_si128(s, t);      /* st = s^t */                  \
+                                                                               \
+  const __m128i ad = _mm_xor_si128(a, d);      /* ad = a^d */                  \
+  const __m128i bc = _mm_xor_si128(b, c);      /* bc = b^c */                  \
+                                                                               \
+  const __m128i t1 = _mm_or_si128(ad, bc);     /* (a^d) | (b^c) */             \
+  const __m128i t2 = _mm_or_si128(t1, st);     /* (a^d) | (b^c) | (s^t) */     \
+  const __m128i t3 = _mm_and_si128(t2, one);   /* (a^d) | (b^c) | (s^t) & 1 */ \
+  const __m128i t4 = _mm_avg_epu8(s, t);                                       \
+  const __m128i k = _mm_sub_epi8(t4, t3);      /* k = (a + b + c + d) / 4 */   \
+  __m128i diag1, diag2;                                                        \
+                                                                               \
+  GET_M(bc, t, diag1);                  /* diag1 = (a + 3b + 3c + d) / 8 */    \
+  GET_M(ad, s, diag2);                  /* diag2 = (3a + b + c + 3d) / 8 */    \
+                                                                               \
+  /* pack the alternate pixels */                                              \
+  PACK_AND_STORE(a, b, diag1, diag2, (out) +      0);  /* store top */         \
+  PACK_AND_STORE(c, d, diag2, diag1, (out) + 2 * 32);  /* store bottom */      \
+}
+
+// Turn the macro into a function for reducing code-size when non-critical
+static void Upsample32Pixels_SSE41(const uint8_t r1[], const uint8_t r2[],
+                                  uint8_t* const out) {
+  UPSAMPLE_32PIXELS(r1, r2, out);
+}
+
+#define UPSAMPLE_LAST_BLOCK(tb, bb, num_pixels, out) {                         \
+  uint8_t r1[17], r2[17];                                                      \
+  memcpy(r1, (tb), (num_pixels));                                              \
+  memcpy(r2, (bb), (num_pixels));                                              \
+  /* replicate last byte */                                                    \
+  memset(r1 + (num_pixels), r1[(num_pixels) - 1], 17 - (num_pixels));          \
+  memset(r2 + (num_pixels), r2[(num_pixels) - 1], 17 - (num_pixels));          \
+  /* using the shared function instead of the macro saves ~3k code size */     \
+  Upsample32Pixels_SSE41(r1, r2, out);                                         \
+}
+
+#define CONVERT2RGB_32(FUNC, XSTEP, top_y, bottom_y,                           \
+                       top_dst, bottom_dst, cur_x) do {                        \
+  FUNC##32_SSE41((top_y) + (cur_x), r_u, r_v, (top_dst) + (cur_x) * (XSTEP));  \
+  if ((bottom_y) != NULL) {                                                    \
+    FUNC##32_SSE41((bottom_y) + (cur_x), r_u + 64, r_v + 64,                   \
+                  (bottom_dst) + (cur_x) * (XSTEP));                           \
+  }                                                                            \
+} while (0)
+
+#define SSE4_UPSAMPLE_FUNC(FUNC_NAME, FUNC, XSTEP)                             \
+static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bottom_y,           \
+                      const uint8_t* top_u, const uint8_t* top_v,              \
+                      const uint8_t* cur_u, const uint8_t* cur_v,              \
+                      uint8_t* top_dst, uint8_t* bottom_dst, int len) {        \
+  int uv_pos, pos;                                                             \
+  /* 16byte-aligned array to cache reconstructed u and v */                    \
+  uint8_t uv_buf[14 * 32 + 15] = { 0 };                                        \
+  uint8_t* const r_u = (uint8_t*)((uintptr_t)(uv_buf + 15) & ~15);             \
+  uint8_t* const r_v = r_u + 32;                                               \
+                                                                               \
+  assert(top_y != NULL);                                                       \
+  {   /* Treat the first pixel in regular way */                               \
+    const int u_diag = ((top_u[0] + cur_u[0]) >> 1) + 1;                       \
+    const int v_diag = ((top_v[0] + cur_v[0]) >> 1) + 1;                       \
+    const int u0_t = (top_u[0] + u_diag) >> 1;                                 \
+    const int v0_t = (top_v[0] + v_diag) >> 1;                                 \
+    FUNC(top_y[0], u0_t, v0_t, top_dst);                                       \
+    if (bottom_y != NULL) {                                                    \
+      const int u0_b = (cur_u[0] + u_diag) >> 1;                               \
+      const int v0_b = (cur_v[0] + v_diag) >> 1;                               \
+      FUNC(bottom_y[0], u0_b, v0_b, bottom_dst);                               \
+    }                                                                          \
+  }                                                                            \
+  /* For UPSAMPLE_32PIXELS, 17 u/v values must be read-able for each block */  \
+  for (pos = 1, uv_pos = 0; pos + 32 + 1 <= len; pos += 32, uv_pos += 16) {    \
+    UPSAMPLE_32PIXELS(top_u + uv_pos, cur_u + uv_pos, r_u);                    \
+    UPSAMPLE_32PIXELS(top_v + uv_pos, cur_v + uv_pos, r_v);                    \
+    CONVERT2RGB_32(FUNC, XSTEP, top_y, bottom_y, top_dst, bottom_dst, pos);    \
+  }                                                                            \
+  if (len > 1) {                                                               \
+    const int left_over = ((len + 1) >> 1) - (pos >> 1);                       \
+    uint8_t* const tmp_top_dst = r_u + 4 * 32;                                 \
+    uint8_t* const tmp_bottom_dst = tmp_top_dst + 4 * 32;                      \
+    uint8_t* const tmp_top = tmp_bottom_dst + 4 * 32;                          \
+    uint8_t* const tmp_bottom = (bottom_y == NULL) ? NULL : tmp_top + 32;      \
+    assert(left_over > 0);                                                     \
+    UPSAMPLE_LAST_BLOCK(top_u + uv_pos, cur_u + uv_pos, left_over, r_u);       \
+    UPSAMPLE_LAST_BLOCK(top_v + uv_pos, cur_v + uv_pos, left_over, r_v);       \
+    memcpy(tmp_top, top_y + pos, len - pos);                                   \
+    if (bottom_y != NULL) memcpy(tmp_bottom, bottom_y + pos, len - pos);       \
+    CONVERT2RGB_32(FUNC, XSTEP, tmp_top, tmp_bottom, tmp_top_dst,              \
+         tmp_bottom_dst, 0);                                                   \
+    memcpy(top_dst + pos * (XSTEP), tmp_top_dst, (len - pos) * (XSTEP));       \
+    if (bottom_y != NULL) {                                                    \
+      memcpy(bottom_dst + pos * (XSTEP), tmp_bottom_dst,                       \
+             (len - pos) * (XSTEP));                                           \
+    }                                                                          \
+  }                                                                            \
+}
+
+// SSE4 variants of the fancy upsampler.
+SSE4_UPSAMPLE_FUNC(UpsampleRgbLinePair_SSE41,  VP8YuvToRgb,  3)
+SSE4_UPSAMPLE_FUNC(UpsampleBgrLinePair_SSE41,  VP8YuvToBgr,  3)
+
+#undef GET_M
+#undef PACK_AND_STORE
+#undef UPSAMPLE_32PIXELS
+#undef UPSAMPLE_LAST_BLOCK
+#undef CONVERT2RGB
+#undef CONVERT2RGB_32
+#undef SSE4_UPSAMPLE_FUNC
+
+#endif   // WEBP_REDUCE_CSP
+
+//------------------------------------------------------------------------------
+// Entry point
+
+extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */];
+
+extern void WebPInitUpsamplersSSE41(void);
+
+WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplersSSE41(void) {
+#if !defined(WEBP_REDUCE_CSP)
+  WebPUpsamplers[MODE_RGB]  = UpsampleRgbLinePair_SSE41;
+  WebPUpsamplers[MODE_BGR]  = UpsampleBgrLinePair_SSE41;
+#endif   // WEBP_REDUCE_CSP
+}
+
+#endif  // FANCY_UPSAMPLING
+
+//------------------------------------------------------------------------------
+
+extern WebPYUV444Converter WebPYUV444Converters[/* MODE_LAST */];
+extern void WebPInitYUV444ConvertersSSE41(void);
+
+#define YUV444_FUNC(FUNC_NAME, CALL, CALL_C, XSTEP)                            \
+extern void CALL_C(const uint8_t* y, const uint8_t* u, const uint8_t* v,       \
+                   uint8_t* dst, int len);                                     \
+static void FUNC_NAME(const uint8_t* y, const uint8_t* u, const uint8_t* v,    \
+                      uint8_t* dst, int len) {                                 \
+  int i;                                                                       \
+  const int max_len = len & ~31;                                               \
+  for (i = 0; i < max_len; i += 32) {                                          \
+    CALL(y + i, u + i, v + i, dst + i * (XSTEP));                              \
+  }                                                                            \
+  if (i < len) {  /* C-fallback */                                             \
+    CALL_C(y + i, u + i, v + i, dst + i * (XSTEP), len - i);                   \
+  }                                                                            \
+}
+
+#if !defined(WEBP_REDUCE_CSP)
+YUV444_FUNC(Yuv444ToRgb_SSE41, VP8YuvToRgb32_SSE41, WebPYuv444ToRgb_C, 3);
+YUV444_FUNC(Yuv444ToBgr_SSE41, VP8YuvToBgr32_SSE41, WebPYuv444ToBgr_C, 3);
+#endif  // WEBP_REDUCE_CSP
+
+WEBP_TSAN_IGNORE_FUNCTION void WebPInitYUV444ConvertersSSE41(void) {
+#if !defined(WEBP_REDUCE_CSP)
+  WebPYUV444Converters[MODE_RGB]       = Yuv444ToRgb_SSE41;
+  WebPYUV444Converters[MODE_BGR]       = Yuv444ToBgr_SSE41;
+#endif   // WEBP_REDUCE_CSP
+}
+
+#else
+
+WEBP_DSP_INIT_STUB(WebPInitYUV444ConvertersSSE41)
+
+#endif  // WEBP_USE_SSE41
+
+#if !(defined(FANCY_UPSAMPLING) && defined(WEBP_USE_SSE41))
+WEBP_DSP_INIT_STUB(WebPInitUpsamplersSSE41)
+#endif
diff --git a/media/libwebp/dsp/yuv.c b/media/libwebp/dsp/yuv.c
index dd7d9dedfa..12c04ca426 100644
--- a/media/libwebp/dsp/yuv.c
+++ b/media/libwebp/dsp/yuv.c
@@ -11,63 +11,11 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#include "./yuv.h"
+#include "../dsp/yuv.h"
 
+#include <assert.h>
 #include <stdlib.h>
 
-#if defined(WEBP_YUV_USE_TABLE)
-
-static int done = 0;
-
-static WEBP_INLINE uint8_t clip(int v, int max_value) {
-  return v < 0 ? 0 : v > max_value ? max_value : v;
-}
-
-int16_t VP8kVToR[256], VP8kUToB[256];
-int32_t VP8kVToG[256], VP8kUToG[256];
-uint8_t VP8kClip[YUV_RANGE_MAX - YUV_RANGE_MIN];
-uint8_t VP8kClip4Bits[YUV_RANGE_MAX - YUV_RANGE_MIN];
-
-WEBP_TSAN_IGNORE_FUNCTION void VP8YUVInit(void) {
-  int i;
-  if (done) {
-    return;
-  }
-#ifndef USE_YUVj
-  for (i = 0; i < 256; ++i) {
-    VP8kVToR[i] = (89858 * (i - 128) + YUV_HALF) >> YUV_FIX;
-    VP8kUToG[i] = -22014 * (i - 128) + YUV_HALF;
-    VP8kVToG[i] = -45773 * (i - 128);
-    VP8kUToB[i] = (113618 * (i - 128) + YUV_HALF) >> YUV_FIX;
-  }
-  for (i = YUV_RANGE_MIN; i < YUV_RANGE_MAX; ++i) {
-    const int k = ((i - 16) * 76283 + YUV_HALF) >> YUV_FIX;
-    VP8kClip[i - YUV_RANGE_MIN] = clip(k, 255);
-    VP8kClip4Bits[i - YUV_RANGE_MIN] = clip((k + 8) >> 4, 15);
-  }
-#else
-  for (i = 0; i < 256; ++i) {
-    VP8kVToR[i] = (91881 * (i - 128) + YUV_HALF) >> YUV_FIX;
-    VP8kUToG[i] = -22554 * (i - 128) + YUV_HALF;
-    VP8kVToG[i] = -46802 * (i - 128);
-    VP8kUToB[i] = (116130 * (i - 128) + YUV_HALF) >> YUV_FIX;
-  }
-  for (i = YUV_RANGE_MIN; i < YUV_RANGE_MAX; ++i) {
-    const int k = i;
-    VP8kClip[i - YUV_RANGE_MIN] = clip(k, 255);
-    VP8kClip4Bits[i - YUV_RANGE_MIN] = clip((k + 8) >> 4, 15);
-  }
-#endif
-
-  done = 1;
-}
-
-#else
-
-WEBP_TSAN_IGNORE_FUNCTION void VP8YUVInit(void) {}
-
-#endif  // WEBP_YUV_USE_TABLE
-
 //-----------------------------------------------------------------------------
 // Plain-C version
 
@@ -75,14 +23,14 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8YUVInit(void) {}
 static void FUNC_NAME(const uint8_t* y,                                        \
                       const uint8_t* u, const uint8_t* v,                      \
                       uint8_t* dst, int len) {                                 \
-  const uint8_t* const end = dst + (len & ~1) * XSTEP;                         \
+  const uint8_t* const end = dst + (len & ~1) * (XSTEP);                       \
   while (dst != end) {                                                         \
     FUNC(y[0], u[0], v[0], dst);                                               \
-    FUNC(y[1], u[0], v[0], dst + XSTEP);                                       \
+    FUNC(y[1], u[0], v[0], dst + (XSTEP));                                     \
     y += 2;                                                                    \
     ++u;                                                                       \
     ++v;                                                                       \
-    dst += 2 * XSTEP;                                                          \
+    dst += 2 * (XSTEP);                                                        \
   }                                                                            \
   if (len & 1) {                                                               \
     FUNC(y[0], u[0], v[0], dst);                                               \
@@ -123,15 +71,11 @@ void WebPSamplerProcessPlane(const uint8_t* y, int y_stride,
 WebPSamplerRowFunc WebPSamplers[MODE_LAST];
 
 extern void WebPInitSamplersSSE2(void);
+extern void WebPInitSamplersSSE41(void);
 extern void WebPInitSamplersMIPS32(void);
 extern void WebPInitSamplersMIPSdspR2(void);
 
-static volatile VP8CPUInfo yuv_last_cpuinfo_used =
-    (VP8CPUInfo)&yuv_last_cpuinfo_used;
-
-WEBP_TSAN_IGNORE_FUNCTION void WebPInitSamplers(void) {
-  if (yuv_last_cpuinfo_used == VP8GetCPUInfo) return;
-
+WEBP_DSP_INIT_FUNC(WebPInitSamplers) {
   WebPSamplers[MODE_RGB]       = YuvToRgbRow;
   WebPSamplers[MODE_RGBA]      = YuvToRgbaRow;
   WebPSamplers[MODE_BGR]       = YuvToBgrRow;
@@ -151,6 +95,11 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitSamplers(void) {
       WebPInitSamplersSSE2();
     }
 #endif  // WEBP_USE_SSE2
+#if defined(WEBP_USE_SSE41)
+    if (VP8GetCPUInfo(kSSE4_1)) {
+      WebPInitSamplersSSE41();
+    }
+#endif  // WEBP_USE_SSE41
 #if defined(WEBP_USE_MIPS32)
     if (VP8GetCPUInfo(kMIPS32)) {
       WebPInitSamplersMIPS32();
@@ -162,13 +111,12 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitSamplers(void) {
     }
 #endif  // WEBP_USE_MIPS_DSP_R2
   }
-  yuv_last_cpuinfo_used = VP8GetCPUInfo;
 }
 
 //-----------------------------------------------------------------------------
 // ARGB -> YUV converters
 
-static void ConvertARGBToY(const uint32_t* argb, uint8_t* y, int width) {
+static void ConvertARGBToY_C(const uint32_t* argb, uint8_t* y, int width) {
   int i;
   for (i = 0; i < width; ++i) {
     const uint32_t p = argb[i];
@@ -220,14 +168,14 @@ void WebPConvertARGBToUV_C(const uint32_t* argb, uint8_t* u, uint8_t* v,
 
 //-----------------------------------------------------------------------------
 
-static void ConvertRGB24ToY(const uint8_t* rgb, uint8_t* y, int width) {
+static void ConvertRGB24ToY_C(const uint8_t* rgb, uint8_t* y, int width) {
   int i;
   for (i = 0; i < width; ++i, rgb += 3) {
     y[i] = VP8RGBToY(rgb[0], rgb[1], rgb[2], YUV_HALF);
   }
 }
 
-static void ConvertBGR24ToY(const uint8_t* bgr, uint8_t* y, int width) {
+static void ConvertBGR24ToY_C(const uint8_t* bgr, uint8_t* y, int width) {
   int i;
   for (i = 0; i < width; ++i, bgr += 3) {
     y[i] = VP8RGBToY(bgr[2], bgr[1], bgr[0], YUV_HALF);
@@ -246,6 +194,7 @@ void WebPConvertRGBA32ToUV_C(const uint16_t* rgb,
 
 //-----------------------------------------------------------------------------
 
+#if !WEBP_NEON_OMIT_C_CODE
 #define MAX_Y ((1 << 10) - 1)    // 10b precision over 16b-arithmetic
 static uint16_t clip_y(int v) {
   return (v < 0) ? 0 : (v > MAX_Y) ? MAX_Y : (uint16_t)v;
@@ -283,6 +232,7 @@ static void SharpYUVFilterRow_C(const int16_t* A, const int16_t* B, int len,
     out[2 * i + 1] = clip_y(best_y[2 * i + 1] + v1);
   }
 }
+#endif  // !WEBP_NEON_OMIT_C_CODE
 
 #undef MAX_Y
 
@@ -304,26 +254,26 @@ void (*WebPSharpYUVUpdateRGB)(const int16_t* ref, const int16_t* src,
 void (*WebPSharpYUVFilterRow)(const int16_t* A, const int16_t* B, int len,
                               const uint16_t* best_y, uint16_t* out);
 
-static volatile VP8CPUInfo rgba_to_yuv_last_cpuinfo_used =
-    (VP8CPUInfo)&rgba_to_yuv_last_cpuinfo_used;
-
 extern void WebPInitConvertARGBToYUVSSE2(void);
+extern void WebPInitConvertARGBToYUVSSE41(void);
+extern void WebPInitConvertARGBToYUVNEON(void);
 extern void WebPInitSharpYUVSSE2(void);
+extern void WebPInitSharpYUVNEON(void);
 
-WEBP_TSAN_IGNORE_FUNCTION void WebPInitConvertARGBToYUV(void) {
-  if (rgba_to_yuv_last_cpuinfo_used == VP8GetCPUInfo) return;
-
-  WebPConvertARGBToY = ConvertARGBToY;
+WEBP_DSP_INIT_FUNC(WebPInitConvertARGBToYUV) {
+  WebPConvertARGBToY = ConvertARGBToY_C;
   WebPConvertARGBToUV = WebPConvertARGBToUV_C;
 
-  WebPConvertRGB24ToY = ConvertRGB24ToY;
-  WebPConvertBGR24ToY = ConvertBGR24ToY;
+  WebPConvertRGB24ToY = ConvertRGB24ToY_C;
+  WebPConvertBGR24ToY = ConvertBGR24ToY_C;
 
   WebPConvertRGBA32ToUV = WebPConvertRGBA32ToUV_C;
 
+#if !WEBP_NEON_OMIT_C_CODE
   WebPSharpYUVUpdateY = SharpYUVUpdateY_C;
   WebPSharpYUVUpdateRGB = SharpYUVUpdateRGB_C;
   WebPSharpYUVFilterRow = SharpYUVFilterRow_C;
+#endif
 
   if (VP8GetCPUInfo != NULL) {
 #if defined(WEBP_USE_SSE2)
@@ -332,6 +282,27 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitConvertARGBToYUV(void) {
       WebPInitSharpYUVSSE2();
     }
 #endif  // WEBP_USE_SSE2
+#if defined(WEBP_USE_SSE41)
+    if (VP8GetCPUInfo(kSSE4_1)) {
+      WebPInitConvertARGBToYUVSSE41();
+    }
+#endif  // WEBP_USE_SSE41
+  }
+
+#if defined(WEBP_USE_NEON)
+  if (WEBP_NEON_OMIT_C_CODE ||
+      (VP8GetCPUInfo != NULL && VP8GetCPUInfo(kNEON))) {
+    WebPInitConvertARGBToYUVNEON();
+    WebPInitSharpYUVNEON();
   }
-  rgba_to_yuv_last_cpuinfo_used = VP8GetCPUInfo;
+#endif  // WEBP_USE_NEON
+
+  assert(WebPConvertARGBToY != NULL);
+  assert(WebPConvertARGBToUV != NULL);
+  assert(WebPConvertRGB24ToY != NULL);
+  assert(WebPConvertBGR24ToY != NULL);
+  assert(WebPConvertRGBA32ToUV != NULL);
+  assert(WebPSharpYUVUpdateY != NULL);
+  assert(WebPSharpYUVUpdateRGB != NULL);
+  assert(WebPSharpYUVFilterRow != NULL);
 }
diff --git a/media/libwebp/dsp/yuv.h b/media/libwebp/dsp/yuv.h
index 1d33b5863b..b4c5d0b6cf 100644
--- a/media/libwebp/dsp/yuv.h
+++ b/media/libwebp/dsp/yuv.h
@@ -35,19 +35,9 @@
 #ifndef WEBP_DSP_YUV_H_
 #define WEBP_DSP_YUV_H_
 
-#include "./dsp.h"
+#include "../dsp/dsp.h"
 #include "../dec/vp8_dec.h"
 
-#if defined(WEBP_EXPERIMENTAL_FEATURES)
-// Do NOT activate this feature for real compression. This is only experimental!
-// This flag is for comparison purpose against JPEG's "YUVj" natural colorspace.
-// This colorspace is close to Rec.601's Y'CbCr model with the notable
-// difference of allowing larger range for luma/chroma.
-// See http://en.wikipedia.org/wiki/YCbCr#JPEG_conversion paragraph, and its
-// difference with http://en.wikipedia.org/wiki/YCbCr#ITU-R_BT.601_conversion
-// #define USE_YUVj
-#endif
-
 //------------------------------------------------------------------------------
 // YUV -> RGB conversion
 
@@ -58,12 +48,8 @@ extern "C" {
 enum {
   YUV_FIX = 16,                    // fixed-point precision for RGB->YUV
   YUV_HALF = 1 << (YUV_FIX - 1),
-  YUV_MASK = (256 << YUV_FIX) - 1,
-  YUV_RANGE_MIN = -227,            // min value of r/g/b output
-  YUV_RANGE_MAX = 256 + 226,       // max value of r/g/b output
 
   YUV_FIX2 = 6,                   // fixed-point precision for YUV->RGB
-  YUV_HALF2 = 1 << YUV_FIX2 >> 1,
   YUV_MASK2 = (256 << YUV_FIX2) - 1
 };
 
@@ -111,7 +97,7 @@ static WEBP_INLINE void VP8YuvToRgb565(int y, int u, int v,
   const int b = VP8YUVToB(y, u);      // 5 usable bits
   const int rg = (r & 0xf8) | (g >> 5);
   const int gb = ((g << 3) & 0xe0) | (b >> 3);
-#ifdef WEBP_SWAP_16BIT_CSP
+#if (WEBP_SWAP_16BIT_CSP == 1)
   rgb[0] = gb;
   rgb[1] = rg;
 #else
@@ -127,7 +113,7 @@ static WEBP_INLINE void VP8YuvToRgba4444(int y, int u, int v,
   const int b = VP8YUVToB(y, u);        // 4 usable bits
   const int rg = (r & 0xf0) | (g >> 4);
   const int ba = (b & 0xf0) | 0x0f;     // overwrite the lower 4 bits
-#ifdef WEBP_SWAP_16BIT_CSP
+#if (WEBP_SWAP_16BIT_CSP == 1)
   argb[0] = ba;
   argb[1] = rg;
 #else
@@ -157,32 +143,42 @@ static WEBP_INLINE void VP8YuvToRgba(uint8_t y, uint8_t u, uint8_t v,
   rgba[3] = 0xff;
 }
 
-// Must be called before everything, to initialize the tables.
-void VP8YUVInit(void);
-
 //-----------------------------------------------------------------------------
 // SSE2 extra functions (mostly for upsampling_sse2.c)
 
 #if defined(WEBP_USE_SSE2)
 
 // Process 32 pixels and store the result (16b, 24b or 32b per pixel) in *dst.
-void VP8YuvToRgba32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
-                    uint8_t* dst);
-void VP8YuvToRgb32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
-                   uint8_t* dst);
-void VP8YuvToBgra32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
-                    uint8_t* dst);
-void VP8YuvToBgr32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
-                   uint8_t* dst);
-void VP8YuvToArgb32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
-                    uint8_t* dst);
-void VP8YuvToRgba444432(const uint8_t* y, const uint8_t* u, const uint8_t* v,
+void VP8YuvToRgba32_SSE2(const uint8_t* y, const uint8_t* u, const uint8_t* v,
+                         uint8_t* dst);
+void VP8YuvToRgb32_SSE2(const uint8_t* y, const uint8_t* u, const uint8_t* v,
+                        uint8_t* dst);
+void VP8YuvToBgra32_SSE2(const uint8_t* y, const uint8_t* u, const uint8_t* v,
+                         uint8_t* dst);
+void VP8YuvToBgr32_SSE2(const uint8_t* y, const uint8_t* u, const uint8_t* v,
                         uint8_t* dst);
-void VP8YuvToRgb56532(const uint8_t* y, const uint8_t* u, const uint8_t* v,
-                      uint8_t* dst);
+void VP8YuvToArgb32_SSE2(const uint8_t* y, const uint8_t* u, const uint8_t* v,
+                         uint8_t* dst);
+void VP8YuvToRgba444432_SSE2(const uint8_t* y, const uint8_t* u,
+                             const uint8_t* v, uint8_t* dst);
+void VP8YuvToRgb56532_SSE2(const uint8_t* y, const uint8_t* u, const uint8_t* v,
+                           uint8_t* dst);
 
 #endif    // WEBP_USE_SSE2
 
+//-----------------------------------------------------------------------------
+// SSE41 extra functions (mostly for upsampling_sse41.c)
+
+#if defined(WEBP_USE_SSE41)
+
+// Process 32 pixels and store the result (16b, 24b or 32b per pixel) in *dst.
+void VP8YuvToRgb32_SSE41(const uint8_t* y, const uint8_t* u, const uint8_t* v,
+                         uint8_t* dst);
+void VP8YuvToBgr32_SSE41(const uint8_t* y, const uint8_t* u, const uint8_t* v,
+                         uint8_t* dst);
+
+#endif    // WEBP_USE_SSE41
+
 //------------------------------------------------------------------------------
 // RGB -> YUV conversion
 
@@ -192,8 +188,6 @@ static WEBP_INLINE int VP8ClipUV(int uv, int rounding) {
   return ((uv & ~0xff) == 0) ? uv : (uv < 0) ? 0 : 255;
 }
 
-#ifndef USE_YUVj
-
 static WEBP_INLINE int VP8RGBToY(int r, int g, int b, int rounding) {
   const int luma = 16839 * r + 33059 * g + 6420 * b;
   return (luma + rounding + (16 << YUV_FIX)) >> YUV_FIX;  // no need to clip
@@ -209,28 +203,6 @@ static WEBP_INLINE int VP8RGBToV(int r, int g, int b, int rounding) {
   return VP8ClipUV(v, rounding);
 }
 
-#else
-
-// This JPEG-YUV colorspace, only for comparison!
-// These are also 16bit precision coefficients from Rec.601, but with full
-// [0..255] output range.
-static WEBP_INLINE int VP8RGBToY(int r, int g, int b, int rounding) {
-  const int luma = 19595 * r + 38470 * g + 7471 * b;
-  return (luma + rounding) >> YUV_FIX;  // no need to clip
-}
-
-static WEBP_INLINE int VP8RGBToU(int r, int g, int b, int rounding) {
-  const int u = -11058 * r - 21710 * g + 32768 * b;
-  return VP8ClipUV(u, rounding);
-}
-
-static WEBP_INLINE int VP8RGBToV(int r, int g, int b, int rounding) {
-  const int v = 32768 * r - 27439 * g - 5329 * b;
-  return VP8ClipUV(v, rounding);
-}
-
-#endif    // USE_YUVj
-
 #ifdef __cplusplus
 }    // extern "C"
 #endif
diff --git a/media/libwebp/dsp/yuv_sse2.c b/media/libwebp/dsp/yuv_sse2.c
index e33c2bbafd..755662a058 100644
--- a/media/libwebp/dsp/yuv_sse2.c
+++ b/media/libwebp/dsp/yuv_sse2.c
@@ -11,11 +11,11 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#include "./yuv.h"
+#include "../dsp/yuv.h"
 
 #if defined(WEBP_USE_SSE2)
 
-#include "./common_sse2.h"
+#include "../dsp/common_sse2.h"
 #include <stdlib.h>
 #include <emmintrin.h>
 
@@ -26,12 +26,12 @@
 // R = (19077 * y             + 26149 * v - 14234) >> 6
 // G = (19077 * y -  6419 * u - 13320 * v +  8708) >> 6
 // B = (19077 * y + 33050 * u             - 17685) >> 6
-static void ConvertYUV444ToRGB(const __m128i* const Y0,
-                               const __m128i* const U0,
-                               const __m128i* const V0,
-                               __m128i* const R,
-                               __m128i* const G,
-                               __m128i* const B) {
+static void ConvertYUV444ToRGB_SSE2(const __m128i* const Y0,
+                                    const __m128i* const U0,
+                                    const __m128i* const V0,
+                                    __m128i* const R,
+                                    __m128i* const G,
+                                    __m128i* const B) {
   const __m128i k19077 = _mm_set1_epi16(19077);
   const __m128i k26149 = _mm_set1_epi16(26149);
   const __m128i k14234 = _mm_set1_epi16(14234);
@@ -66,13 +66,13 @@ static void ConvertYUV444ToRGB(const __m128i* const Y0,
 }
 
 // Load the bytes into the *upper* part of 16b words. That's "<< 8", basically.
-static WEBP_INLINE __m128i Load_HI_16(const uint8_t* src) {
+static WEBP_INLINE __m128i Load_HI_16_SSE2(const uint8_t* src) {
   const __m128i zero = _mm_setzero_si128();
   return _mm_unpacklo_epi8(zero, _mm_loadl_epi64((const __m128i*)src));
 }
 
 // Load and replicate the U/V samples
-static WEBP_INLINE __m128i Load_UV_HI_8(const uint8_t* src) {
+static WEBP_INLINE __m128i Load_UV_HI_8_SSE2(const uint8_t* src) {
   const __m128i zero = _mm_setzero_si128();
   const __m128i tmp0 = _mm_cvtsi32_si128(*(const uint32_t*)src);
   const __m128i tmp1 = _mm_unpacklo_epi8(zero, tmp0);
@@ -80,29 +80,33 @@ static WEBP_INLINE __m128i Load_UV_HI_8(const uint8_t* src) {
 }
 
 // Convert 32 samples of YUV444 to R/G/B
-static void YUV444ToRGB(const uint8_t* const y,
-                        const uint8_t* const u,
-                        const uint8_t* const v,
-                        __m128i* const R, __m128i* const G, __m128i* const B) {
-  const __m128i Y0 = Load_HI_16(y), U0 = Load_HI_16(u), V0 = Load_HI_16(v);
-  ConvertYUV444ToRGB(&Y0, &U0, &V0, R, G, B);
+static void YUV444ToRGB_SSE2(const uint8_t* const y,
+                             const uint8_t* const u,
+                             const uint8_t* const v,
+                             __m128i* const R, __m128i* const G,
+                             __m128i* const B) {
+  const __m128i Y0 = Load_HI_16_SSE2(y), U0 = Load_HI_16_SSE2(u),
+                V0 = Load_HI_16_SSE2(v);
+  ConvertYUV444ToRGB_SSE2(&Y0, &U0, &V0, R, G, B);
 }
 
 // Convert 32 samples of YUV420 to R/G/B
-static void YUV420ToRGB(const uint8_t* const y,
-                        const uint8_t* const u,
-                        const uint8_t* const v,
-                        __m128i* const R, __m128i* const G, __m128i* const B) {
-  const __m128i Y0 = Load_HI_16(y), U0 = Load_UV_HI_8(u), V0 = Load_UV_HI_8(v);
-  ConvertYUV444ToRGB(&Y0, &U0, &V0, R, G, B);
+static void YUV420ToRGB_SSE2(const uint8_t* const y,
+                             const uint8_t* const u,
+                             const uint8_t* const v,
+                             __m128i* const R, __m128i* const G,
+                             __m128i* const B) {
+  const __m128i Y0 = Load_HI_16_SSE2(y), U0 = Load_UV_HI_8_SSE2(u),
+                V0 = Load_UV_HI_8_SSE2(v);
+  ConvertYUV444ToRGB_SSE2(&Y0, &U0, &V0, R, G, B);
 }
 
 // Pack R/G/B/A results into 32b output.
-static WEBP_INLINE void PackAndStore4(const __m128i* const R,
-                                      const __m128i* const G,
-                                      const __m128i* const B,
-                                      const __m128i* const A,
-                                      uint8_t* const dst) {
+static WEBP_INLINE void PackAndStore4_SSE2(const __m128i* const R,
+                                           const __m128i* const G,
+                                           const __m128i* const B,
+                                           const __m128i* const A,
+                                           uint8_t* const dst) {
   const __m128i rb = _mm_packus_epi16(*R, *B);
   const __m128i ga = _mm_packus_epi16(*G, *A);
   const __m128i rg = _mm_unpacklo_epi8(rb, ga);
@@ -114,12 +118,12 @@ static WEBP_INLINE void PackAndStore4(const __m128i* const R,
 }
 
 // Pack R/G/B/A results into 16b output.
-static WEBP_INLINE void PackAndStore4444(const __m128i* const R,
-                                         const __m128i* const G,
-                                         const __m128i* const B,
-                                         const __m128i* const A,
-                                         uint8_t* const dst) {
-#if !defined(WEBP_SWAP_16BIT_CSP)
+static WEBP_INLINE void PackAndStore4444_SSE2(const __m128i* const R,
+                                              const __m128i* const G,
+                                              const __m128i* const B,
+                                              const __m128i* const A,
+                                              uint8_t* const dst) {
+#if (WEBP_SWAP_16BIT_CSP == 0)
   const __m128i rg0 = _mm_packus_epi16(*R, *G);
   const __m128i ba0 = _mm_packus_epi16(*B, *A);
 #else
@@ -136,10 +140,10 @@ static WEBP_INLINE void PackAndStore4444(const __m128i* const R,
 }
 
 // Pack R/G/B results into 16b output.
-static WEBP_INLINE void PackAndStore565(const __m128i* const R,
-                                        const __m128i* const G,
-                                        const __m128i* const B,
-                                        uint8_t* const dst) {
+static WEBP_INLINE void PackAndStore565_SSE2(const __m128i* const R,
+                                             const __m128i* const G,
+                                             const __m128i* const B,
+                                             uint8_t* const dst) {
   const __m128i r0 = _mm_packus_epi16(*R, *R);
   const __m128i g0 = _mm_packus_epi16(*G, *G);
   const __m128i b0 = _mm_packus_epi16(*B, *B);
@@ -149,7 +153,7 @@ static WEBP_INLINE void PackAndStore565(const __m128i* const R,
   const __m128i g2 = _mm_slli_epi16(_mm_and_si128(g0, _mm_set1_epi8(0x1c)), 3);
   const __m128i rg = _mm_or_si128(r1, g1);
   const __m128i gb = _mm_or_si128(g2, b1);
-#if !defined(WEBP_SWAP_16BIT_CSP)
+#if (WEBP_SWAP_16BIT_CSP == 0)
   const __m128i rgb565 = _mm_unpacklo_epi8(rg, gb);
 #else
   const __m128i rgb565 = _mm_unpacklo_epi8(gb, rg);
@@ -160,10 +164,10 @@ static WEBP_INLINE void PackAndStore565(const __m128i* const R,
 // Pack the planar buffers
 // rrrr... rrrr... gggg... gggg... bbbb... bbbb....
 // triplet by triplet in the output buffer rgb as rgbrgbrgbrgb ...
-static WEBP_INLINE void PlanarTo24b(__m128i* const in0, __m128i* const in1,
-                                    __m128i* const in2, __m128i* const in3,
-                                    __m128i* const in4, __m128i* const in5,
-                                    uint8_t* const rgb) {
+static WEBP_INLINE void PlanarTo24b_SSE2(__m128i* const in0, __m128i* const in1,
+                                         __m128i* const in2, __m128i* const in3,
+                                         __m128i* const in4, __m128i* const in5,
+                                         uint8_t* const rgb) {
   // The input is 6 registers of sixteen 8b but for the sake of explanation,
   // let's take 6 registers of four 8b values.
   // To pack, we will keep taking one every two 8b integer and move it
@@ -176,7 +180,7 @@ static WEBP_INLINE void PlanarTo24b(__m128i* const in0, __m128i* const in1,
   // Repeat the same permutations twice more:
   //   r0r4g0g4 | b0b4r1r5 | g1g5b1b5 | r2r6g2g6 | b2b6r3r7 | g3g7b3b7
   //   r0g0b0r1 | g1b1r2g2 | b2r3g3b3 | r4g4b4r5 | g5b5r6g6 | b6r7g7b7
-  VP8PlanarTo24b(in0, in1, in2, in3, in4, in5);
+  VP8PlanarTo24b_SSE2(in0, in1, in2, in3, in4, in5);
 
   _mm_storeu_si128((__m128i*)(rgb +  0), *in0);
   _mm_storeu_si128((__m128i*)(rgb + 16), *in1);
@@ -186,69 +190,69 @@ static WEBP_INLINE void PlanarTo24b(__m128i* const in0, __m128i* const in1,
   _mm_storeu_si128((__m128i*)(rgb + 80), *in5);
 }
 
-void VP8YuvToRgba32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
-                    uint8_t* dst) {
+void VP8YuvToRgba32_SSE2(const uint8_t* y, const uint8_t* u, const uint8_t* v,
+                         uint8_t* dst) {
   const __m128i kAlpha = _mm_set1_epi16(255);
   int n;
   for (n = 0; n < 32; n += 8, dst += 32) {
     __m128i R, G, B;
-    YUV444ToRGB(y + n, u + n, v + n, &R, &G, &B);
-    PackAndStore4(&R, &G, &B, &kAlpha, dst);
+    YUV444ToRGB_SSE2(y + n, u + n, v + n, &R, &G, &B);
+    PackAndStore4_SSE2(&R, &G, &B, &kAlpha, dst);
   }
 }
 
-void VP8YuvToBgra32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
-                    uint8_t* dst) {
+void VP8YuvToBgra32_SSE2(const uint8_t* y, const uint8_t* u, const uint8_t* v,
+                         uint8_t* dst) {
   const __m128i kAlpha = _mm_set1_epi16(255);
   int n;
   for (n = 0; n < 32; n += 8, dst += 32) {
     __m128i R, G, B;
-    YUV444ToRGB(y + n, u + n, v + n, &R, &G, &B);
-    PackAndStore4(&B, &G, &R, &kAlpha, dst);
+    YUV444ToRGB_SSE2(y + n, u + n, v + n, &R, &G, &B);
+    PackAndStore4_SSE2(&B, &G, &R, &kAlpha, dst);
   }
 }
 
-void VP8YuvToArgb32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
-                    uint8_t* dst) {
+void VP8YuvToArgb32_SSE2(const uint8_t* y, const uint8_t* u, const uint8_t* v,
+                         uint8_t* dst) {
   const __m128i kAlpha = _mm_set1_epi16(255);
   int n;
   for (n = 0; n < 32; n += 8, dst += 32) {
     __m128i R, G, B;
-    YUV444ToRGB(y + n, u + n, v + n, &R, &G, &B);
-    PackAndStore4(&kAlpha, &R, &G, &B, dst);
+    YUV444ToRGB_SSE2(y + n, u + n, v + n, &R, &G, &B);
+    PackAndStore4_SSE2(&kAlpha, &R, &G, &B, dst);
   }
 }
 
-void VP8YuvToRgba444432(const uint8_t* y, const uint8_t* u, const uint8_t* v,
-                        uint8_t* dst) {
+void VP8YuvToRgba444432_SSE2(const uint8_t* y, const uint8_t* u,
+                             const uint8_t* v, uint8_t* dst) {
   const __m128i kAlpha = _mm_set1_epi16(255);
   int n;
   for (n = 0; n < 32; n += 8, dst += 16) {
     __m128i R, G, B;
-    YUV444ToRGB(y + n, u + n, v + n, &R, &G, &B);
-    PackAndStore4444(&R, &G, &B, &kAlpha, dst);
+    YUV444ToRGB_SSE2(y + n, u + n, v + n, &R, &G, &B);
+    PackAndStore4444_SSE2(&R, &G, &B, &kAlpha, dst);
   }
 }
 
-void VP8YuvToRgb56532(const uint8_t* y, const uint8_t* u, const uint8_t* v,
-                      uint8_t* dst) {
+void VP8YuvToRgb56532_SSE2(const uint8_t* y, const uint8_t* u, const uint8_t* v,
+                           uint8_t* dst) {
   int n;
   for (n = 0; n < 32; n += 8, dst += 16) {
     __m128i R, G, B;
-    YUV444ToRGB(y + n, u + n, v + n, &R, &G, &B);
-    PackAndStore565(&R, &G, &B, dst);
+    YUV444ToRGB_SSE2(y + n, u + n, v + n, &R, &G, &B);
+    PackAndStore565_SSE2(&R, &G, &B, dst);
   }
 }
 
-void VP8YuvToRgb32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
-                   uint8_t* dst) {
+void VP8YuvToRgb32_SSE2(const uint8_t* y, const uint8_t* u, const uint8_t* v,
+                        uint8_t* dst) {
   __m128i R0, R1, R2, R3, G0, G1, G2, G3, B0, B1, B2, B3;
   __m128i rgb0, rgb1, rgb2, rgb3, rgb4, rgb5;
 
-  YUV444ToRGB(y + 0, u + 0, v + 0, &R0, &G0, &B0);
-  YUV444ToRGB(y + 8, u + 8, v + 8, &R1, &G1, &B1);
-  YUV444ToRGB(y + 16, u + 16, v + 16, &R2, &G2, &B2);
-  YUV444ToRGB(y + 24, u + 24, v + 24, &R3, &G3, &B3);
+  YUV444ToRGB_SSE2(y + 0, u + 0, v + 0, &R0, &G0, &B0);
+  YUV444ToRGB_SSE2(y + 8, u + 8, v + 8, &R1, &G1, &B1);
+  YUV444ToRGB_SSE2(y + 16, u + 16, v + 16, &R2, &G2, &B2);
+  YUV444ToRGB_SSE2(y + 24, u + 24, v + 24, &R3, &G3, &B3);
 
   // Cast to 8b and store as RRRRGGGGBBBB.
   rgb0 = _mm_packus_epi16(R0, R1);
@@ -259,18 +263,18 @@ void VP8YuvToRgb32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
   rgb5 = _mm_packus_epi16(B2, B3);
 
   // Pack as RGBRGBRGBRGB.
-  PlanarTo24b(&rgb0, &rgb1, &rgb2, &rgb3, &rgb4, &rgb5, dst);
+  PlanarTo24b_SSE2(&rgb0, &rgb1, &rgb2, &rgb3, &rgb4, &rgb5, dst);
 }
 
-void VP8YuvToBgr32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
-                   uint8_t* dst) {
+void VP8YuvToBgr32_SSE2(const uint8_t* y, const uint8_t* u, const uint8_t* v,
+                        uint8_t* dst) {
   __m128i R0, R1, R2, R3, G0, G1, G2, G3, B0, B1, B2, B3;
   __m128i bgr0, bgr1, bgr2, bgr3, bgr4, bgr5;
 
-  YUV444ToRGB(y +  0, u +  0, v +  0, &R0, &G0, &B0);
-  YUV444ToRGB(y +  8, u +  8, v +  8, &R1, &G1, &B1);
-  YUV444ToRGB(y + 16, u + 16, v + 16, &R2, &G2, &B2);
-  YUV444ToRGB(y + 24, u + 24, v + 24, &R3, &G3, &B3);
+  YUV444ToRGB_SSE2(y +  0, u +  0, v +  0, &R0, &G0, &B0);
+  YUV444ToRGB_SSE2(y +  8, u +  8, v +  8, &R1, &G1, &B1);
+  YUV444ToRGB_SSE2(y + 16, u + 16, v + 16, &R2, &G2, &B2);
+  YUV444ToRGB_SSE2(y + 24, u + 24, v + 24, &R3, &G3, &B3);
 
   // Cast to 8b and store as BBBBGGGGRRRR.
   bgr0 = _mm_packus_epi16(B0, B1);
@@ -281,20 +285,21 @@ void VP8YuvToBgr32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
   bgr5= _mm_packus_epi16(R2, R3);
 
   // Pack as BGRBGRBGRBGR.
-  PlanarTo24b(&bgr0, &bgr1, &bgr2, &bgr3, &bgr4, &bgr5, dst);
+  PlanarTo24b_SSE2(&bgr0, &bgr1, &bgr2, &bgr3, &bgr4, &bgr5, dst);
 }
 
 //-----------------------------------------------------------------------------
 // Arbitrary-length row conversion functions
 
-static void YuvToRgbaRow(const uint8_t* y, const uint8_t* u, const uint8_t* v,
-                         uint8_t* dst, int len) {
+static void YuvToRgbaRow_SSE2(const uint8_t* y,
+                              const uint8_t* u, const uint8_t* v,
+                              uint8_t* dst, int len) {
   const __m128i kAlpha = _mm_set1_epi16(255);
   int n;
   for (n = 0; n + 8 <= len; n += 8, dst += 32) {
     __m128i R, G, B;
-    YUV420ToRGB(y, u, v, &R, &G, &B);
-    PackAndStore4(&R, &G, &B, &kAlpha, dst);
+    YUV420ToRGB_SSE2(y, u, v, &R, &G, &B);
+    PackAndStore4_SSE2(&R, &G, &B, &kAlpha, dst);
     y += 8;
     u += 4;
     v += 4;
@@ -308,14 +313,15 @@ static void YuvToRgbaRow(const uint8_t* y, const uint8_t* u, const uint8_t* v,
   }
 }
 
-static void YuvToBgraRow(const uint8_t* y, const uint8_t* u, const uint8_t* v,
-                         uint8_t* dst, int len) {
+static void YuvToBgraRow_SSE2(const uint8_t* y,
+                              const uint8_t* u, const uint8_t* v,
+                              uint8_t* dst, int len) {
   const __m128i kAlpha = _mm_set1_epi16(255);
   int n;
   for (n = 0; n + 8 <= len; n += 8, dst += 32) {
     __m128i R, G, B;
-    YUV420ToRGB(y, u, v, &R, &G, &B);
-    PackAndStore4(&B, &G, &R, &kAlpha, dst);
+    YUV420ToRGB_SSE2(y, u, v, &R, &G, &B);
+    PackAndStore4_SSE2(&B, &G, &R, &kAlpha, dst);
     y += 8;
     u += 4;
     v += 4;
@@ -329,14 +335,15 @@ static void YuvToBgraRow(const uint8_t* y, const uint8_t* u, const uint8_t* v,
   }
 }
 
-static void YuvToArgbRow(const uint8_t* y, const uint8_t* u, const uint8_t* v,
-                         uint8_t* dst, int len) {
+static void YuvToArgbRow_SSE2(const uint8_t* y,
+                              const uint8_t* u, const uint8_t* v,
+                              uint8_t* dst, int len) {
   const __m128i kAlpha = _mm_set1_epi16(255);
   int n;
   for (n = 0; n + 8 <= len; n += 8, dst += 32) {
     __m128i R, G, B;
-    YUV420ToRGB(y, u, v, &R, &G, &B);
-    PackAndStore4(&kAlpha, &R, &G, &B, dst);
+    YUV420ToRGB_SSE2(y, u, v, &R, &G, &B);
+    PackAndStore4_SSE2(&kAlpha, &R, &G, &B, dst);
     y += 8;
     u += 4;
     v += 4;
@@ -350,17 +357,18 @@ static void YuvToArgbRow(const uint8_t* y, const uint8_t* u, const uint8_t* v,
   }
 }
 
-static void YuvToRgbRow(const uint8_t* y, const uint8_t* u, const uint8_t* v,
-                        uint8_t* dst, int len) {
+static void YuvToRgbRow_SSE2(const uint8_t* y,
+                             const uint8_t* u, const uint8_t* v,
+                             uint8_t* dst, int len) {
   int n;
   for (n = 0; n + 32 <= len; n += 32, dst += 32 * 3) {
     __m128i R0, R1, R2, R3, G0, G1, G2, G3, B0, B1, B2, B3;
     __m128i rgb0, rgb1, rgb2, rgb3, rgb4, rgb5;
 
-    YUV420ToRGB(y +  0, u +  0, v +  0, &R0, &G0, &B0);
-    YUV420ToRGB(y +  8, u +  4, v +  4, &R1, &G1, &B1);
-    YUV420ToRGB(y + 16, u +  8, v +  8, &R2, &G2, &B2);
-    YUV420ToRGB(y + 24, u + 12, v + 12, &R3, &G3, &B3);
+    YUV420ToRGB_SSE2(y +  0, u +  0, v +  0, &R0, &G0, &B0);
+    YUV420ToRGB_SSE2(y +  8, u +  4, v +  4, &R1, &G1, &B1);
+    YUV420ToRGB_SSE2(y + 16, u +  8, v +  8, &R2, &G2, &B2);
+    YUV420ToRGB_SSE2(y + 24, u + 12, v + 12, &R3, &G3, &B3);
 
     // Cast to 8b and store as RRRRGGGGBBBB.
     rgb0 = _mm_packus_epi16(R0, R1);
@@ -371,7 +379,7 @@ static void YuvToRgbRow(const uint8_t* y, const uint8_t* u, const uint8_t* v,
     rgb5 = _mm_packus_epi16(B2, B3);
 
     // Pack as RGBRGBRGBRGB.
-    PlanarTo24b(&rgb0, &rgb1, &rgb2, &rgb3, &rgb4, &rgb5, dst);
+    PlanarTo24b_SSE2(&rgb0, &rgb1, &rgb2, &rgb3, &rgb4, &rgb5, dst);
 
     y += 32;
     u += 16;
@@ -386,17 +394,18 @@ static void YuvToRgbRow(const uint8_t* y, const uint8_t* u, const uint8_t* v,
   }
 }
 
-static void YuvToBgrRow(const uint8_t* y, const uint8_t* u, const uint8_t* v,
-                        uint8_t* dst, int len) {
+static void YuvToBgrRow_SSE2(const uint8_t* y,
+                             const uint8_t* u, const uint8_t* v,
+                             uint8_t* dst, int len) {
   int n;
   for (n = 0; n + 32 <= len; n += 32, dst += 32 * 3) {
     __m128i R0, R1, R2, R3, G0, G1, G2, G3, B0, B1, B2, B3;
     __m128i bgr0, bgr1, bgr2, bgr3, bgr4, bgr5;
 
-    YUV420ToRGB(y +  0, u +  0, v +  0, &R0, &G0, &B0);
-    YUV420ToRGB(y +  8, u +  4, v +  4, &R1, &G1, &B1);
-    YUV420ToRGB(y + 16, u +  8, v +  8, &R2, &G2, &B2);
-    YUV420ToRGB(y + 24, u + 12, v + 12, &R3, &G3, &B3);
+    YUV420ToRGB_SSE2(y +  0, u +  0, v +  0, &R0, &G0, &B0);
+    YUV420ToRGB_SSE2(y +  8, u +  4, v +  4, &R1, &G1, &B1);
+    YUV420ToRGB_SSE2(y + 16, u +  8, v +  8, &R2, &G2, &B2);
+    YUV420ToRGB_SSE2(y + 24, u + 12, v + 12, &R3, &G3, &B3);
 
     // Cast to 8b and store as BBBBGGGGRRRR.
     bgr0 = _mm_packus_epi16(B0, B1);
@@ -407,7 +416,7 @@ static void YuvToBgrRow(const uint8_t* y, const uint8_t* u, const uint8_t* v,
     bgr5 = _mm_packus_epi16(R2, R3);
 
     // Pack as BGRBGRBGRBGR.
-    PlanarTo24b(&bgr0, &bgr1, &bgr2, &bgr3, &bgr4, &bgr5, dst);
+    PlanarTo24b_SSE2(&bgr0, &bgr1, &bgr2, &bgr3, &bgr4, &bgr5, dst);
 
     y += 32;
     u += 16;
@@ -428,11 +437,11 @@ static void YuvToBgrRow(const uint8_t* y, const uint8_t* u, const uint8_t* v,
 extern void WebPInitSamplersSSE2(void);
 
 WEBP_TSAN_IGNORE_FUNCTION void WebPInitSamplersSSE2(void) {
-  WebPSamplers[MODE_RGB]  = YuvToRgbRow;
-  WebPSamplers[MODE_RGBA] = YuvToRgbaRow;
-  WebPSamplers[MODE_BGR]  = YuvToBgrRow;
-  WebPSamplers[MODE_BGRA] = YuvToBgraRow;
-  WebPSamplers[MODE_ARGB] = YuvToArgbRow;
+  WebPSamplers[MODE_RGB]  = YuvToRgbRow_SSE2;
+  WebPSamplers[MODE_RGBA] = YuvToRgbaRow_SSE2;
+  WebPSamplers[MODE_BGR]  = YuvToBgrRow_SSE2;
+  WebPSamplers[MODE_BGRA] = YuvToBgraRow_SSE2;
+  WebPSamplers[MODE_ARGB] = YuvToArgbRow_SSE2;
 }
 
 //------------------------------------------------------------------------------
@@ -445,7 +454,7 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitSamplersSSE2(void) {
 
 // Function that inserts a value of the second half of the in buffer in between
 // every two char of the first half.
-static WEBP_INLINE void RGB24PackedToPlanarHelper(
+static WEBP_INLINE void RGB24PackedToPlanarHelper_SSE2(
     const __m128i* const in /*in[6]*/, __m128i* const out /*out[6]*/) {
   out[0] = _mm_unpacklo_epi8(in[0], in[3]);
   out[1] = _mm_unpackhi_epi8(in[0], in[3]);
@@ -458,8 +467,8 @@ static WEBP_INLINE void RGB24PackedToPlanarHelper(
 // Unpack the 8b input rgbrgbrgbrgb ... as contiguous registers:
 // rrrr... rrrr... gggg... gggg... bbbb... bbbb....
 // Similar to PlanarTo24bHelper(), but in reverse order.
-static WEBP_INLINE void RGB24PackedToPlanar(const uint8_t* const rgb,
-                                            __m128i* const out /*out[6]*/) {
+static WEBP_INLINE void RGB24PackedToPlanar_SSE2(
+    const uint8_t* const rgb, __m128i* const out /*out[6]*/) {
   __m128i tmp[6];
   tmp[0] = _mm_loadu_si128((const __m128i*)(rgb +  0));
   tmp[1] = _mm_loadu_si128((const __m128i*)(rgb + 16));
@@ -468,22 +477,22 @@ static WEBP_INLINE void RGB24PackedToPlanar(const uint8_t* const rgb,
   tmp[4] = _mm_loadu_si128((const __m128i*)(rgb + 64));
   tmp[5] = _mm_loadu_si128((const __m128i*)(rgb + 80));
 
-  RGB24PackedToPlanarHelper(tmp, out);
-  RGB24PackedToPlanarHelper(out, tmp);
-  RGB24PackedToPlanarHelper(tmp, out);
-  RGB24PackedToPlanarHelper(out, tmp);
-  RGB24PackedToPlanarHelper(tmp, out);
+  RGB24PackedToPlanarHelper_SSE2(tmp, out);
+  RGB24PackedToPlanarHelper_SSE2(out, tmp);
+  RGB24PackedToPlanarHelper_SSE2(tmp, out);
+  RGB24PackedToPlanarHelper_SSE2(out, tmp);
+  RGB24PackedToPlanarHelper_SSE2(tmp, out);
 }
 
 // Convert 8 packed ARGB to r[], g[], b[]
-static WEBP_INLINE void RGB32PackedToPlanar(const uint32_t* const argb,
-                                            __m128i* const rgb /*in[6]*/) {
+static WEBP_INLINE void RGB32PackedToPlanar_SSE2(const uint32_t* const argb,
+                                                 __m128i* const rgb /*in[6]*/) {
   const __m128i zero = _mm_setzero_si128();
   __m128i a0 = LOAD_16(argb + 0);
   __m128i a1 = LOAD_16(argb + 4);
   __m128i a2 = LOAD_16(argb + 8);
   __m128i a3 = LOAD_16(argb + 12);
-  VP8L32bToPlanar(&a0, &a1, &a2, &a3);
+  VP8L32bToPlanar_SSE2(&a0, &a1, &a2, &a3);
   rgb[0] = _mm_unpacklo_epi8(a1, zero);
   rgb[1] = _mm_unpackhi_epi8(a1, zero);
   rgb[2] = _mm_unpacklo_epi8(a2, zero);
@@ -511,10 +520,10 @@ static WEBP_INLINE void RGB32PackedToPlanar(const uint32_t* const argb,
 } while (0)
 
 #define MK_CST_16(A, B) _mm_set_epi16((B), (A), (B), (A), (B), (A), (B), (A))
-static WEBP_INLINE void ConvertRGBToY(const __m128i* const R,
-                                      const __m128i* const G,
-                                      const __m128i* const B,
-                                      __m128i* const Y) {
+static WEBP_INLINE void ConvertRGBToY_SSE2(const __m128i* const R,
+                                           const __m128i* const G,
+                                           const __m128i* const B,
+                                           __m128i* const Y) {
   const __m128i kRG_y = MK_CST_16(16839, 33059 - 16384);
   const __m128i kGB_y = MK_CST_16(16384, 6420);
   const __m128i kHALF_Y = _mm_set1_epi32((16 << YUV_FIX) + YUV_HALF);
@@ -526,10 +535,11 @@ static WEBP_INLINE void ConvertRGBToY(const __m128i* const R,
   TRANSFORM(RG_lo, RG_hi, GB_lo, GB_hi, kRG_y, kGB_y, kHALF_Y, YUV_FIX, *Y);
 }
 
-static WEBP_INLINE void ConvertRGBToUV(const __m128i* const R,
-                                       const __m128i* const G,
-                                       const __m128i* const B,
-                                       __m128i* const U, __m128i* const V) {
+static WEBP_INLINE void ConvertRGBToUV_SSE2(const __m128i* const R,
+                                            const __m128i* const G,
+                                            const __m128i* const B,
+                                            __m128i* const U,
+                                            __m128i* const V) {
   const __m128i kRG_u = MK_CST_16(-9719, -19081);
   const __m128i kGB_u = MK_CST_16(0, 28800);
   const __m128i kRG_v = MK_CST_16(28800, 0);
@@ -549,14 +559,14 @@ static WEBP_INLINE void ConvertRGBToUV(const __m128i* const R,
 #undef MK_CST_16
 #undef TRANSFORM
 
-static void ConvertRGB24ToY(const uint8_t* rgb, uint8_t* y, int width) {
+static void ConvertRGB24ToY_SSE2(const uint8_t* rgb, uint8_t* y, int width) {
   const int max_width = width & ~31;
   int i;
   for (i = 0; i < max_width; rgb += 3 * 16 * 2) {
     __m128i rgb_plane[6];
     int j;
 
-    RGB24PackedToPlanar(rgb, rgb_plane);
+    RGB24PackedToPlanar_SSE2(rgb, rgb_plane);
 
     for (j = 0; j < 2; ++j, i += 16) {
       const __m128i zero = _mm_setzero_si128();
@@ -566,13 +576,13 @@ static void ConvertRGB24ToY(const uint8_t* rgb, uint8_t* y, int width) {
       r = _mm_unpacklo_epi8(rgb_plane[0 + j], zero);
       g = _mm_unpacklo_epi8(rgb_plane[2 + j], zero);
       b = _mm_unpacklo_epi8(rgb_plane[4 + j], zero);
-      ConvertRGBToY(&r, &g, &b, &Y0);
+      ConvertRGBToY_SSE2(&r, &g, &b, &Y0);
 
       // Convert to 16-bit Y.
       r = _mm_unpackhi_epi8(rgb_plane[0 + j], zero);
       g = _mm_unpackhi_epi8(rgb_plane[2 + j], zero);
       b = _mm_unpackhi_epi8(rgb_plane[4 + j], zero);
-      ConvertRGBToY(&r, &g, &b, &Y1);
+      ConvertRGBToY_SSE2(&r, &g, &b, &Y1);
 
       // Cast to 8-bit and store.
       STORE_16(_mm_packus_epi16(Y0, Y1), y + i);
@@ -583,14 +593,14 @@ static void ConvertRGB24ToY(const uint8_t* rgb, uint8_t* y, int width) {
   }
 }
 
-static void ConvertBGR24ToY(const uint8_t* bgr, uint8_t* y, int width) {
+static void ConvertBGR24ToY_SSE2(const uint8_t* bgr, uint8_t* y, int width) {
   const int max_width = width & ~31;
   int i;
   for (i = 0; i < max_width; bgr += 3 * 16 * 2) {
     __m128i bgr_plane[6];
     int j;
 
-    RGB24PackedToPlanar(bgr, bgr_plane);
+    RGB24PackedToPlanar_SSE2(bgr, bgr_plane);
 
     for (j = 0; j < 2; ++j, i += 16) {
       const __m128i zero = _mm_setzero_si128();
@@ -600,13 +610,13 @@ static void ConvertBGR24ToY(const uint8_t* bgr, uint8_t* y, int width) {
       b = _mm_unpacklo_epi8(bgr_plane[0 + j], zero);
       g = _mm_unpacklo_epi8(bgr_plane[2 + j], zero);
       r = _mm_unpacklo_epi8(bgr_plane[4 + j], zero);
-      ConvertRGBToY(&r, &g, &b, &Y0);
+      ConvertRGBToY_SSE2(&r, &g, &b, &Y0);
 
       // Convert to 16-bit Y.
       b = _mm_unpackhi_epi8(bgr_plane[0 + j], zero);
       g = _mm_unpackhi_epi8(bgr_plane[2 + j], zero);
       r = _mm_unpackhi_epi8(bgr_plane[4 + j], zero);
-      ConvertRGBToY(&r, &g, &b, &Y1);
+      ConvertRGBToY_SSE2(&r, &g, &b, &Y1);
 
       // Cast to 8-bit and store.
       STORE_16(_mm_packus_epi16(Y0, Y1), y + i);
@@ -617,14 +627,14 @@ static void ConvertBGR24ToY(const uint8_t* bgr, uint8_t* y, int width) {
   }
 }
 
-static void ConvertARGBToY(const uint32_t* argb, uint8_t* y, int width) {
+static void ConvertARGBToY_SSE2(const uint32_t* argb, uint8_t* y, int width) {
   const int max_width = width & ~15;
   int i;
   for (i = 0; i < max_width; i += 16) {
     __m128i Y0, Y1, rgb[6];
-    RGB32PackedToPlanar(&argb[i], rgb);
-    ConvertRGBToY(&rgb[0], &rgb[2], &rgb[4], &Y0);
-    ConvertRGBToY(&rgb[1], &rgb[3], &rgb[5], &Y1);
+    RGB32PackedToPlanar_SSE2(&argb[i], rgb);
+    ConvertRGBToY_SSE2(&rgb[0], &rgb[2], &rgb[4], &Y0);
+    ConvertRGBToY_SSE2(&rgb[1], &rgb[3], &rgb[5], &Y1);
     STORE_16(_mm_packus_epi16(Y0, Y1), y + i);
   }
   for (; i < width; ++i) {   // left-over
@@ -636,31 +646,33 @@ static void ConvertARGBToY(const uint32_t* argb, uint8_t* y, int width) {
 
 // Horizontal add (doubled) of two 16b values, result is 16b.
 // in: A | B | C | D | ... -> out: 2*(A+B) | 2*(C+D) | ...
-static void HorizontalAddPack(const __m128i* const A, const __m128i* const B,
-                              __m128i* const out) {
+static void HorizontalAddPack_SSE2(const __m128i* const A,
+                                   const __m128i* const B,
+                                   __m128i* const out) {
   const __m128i k2 = _mm_set1_epi16(2);
   const __m128i C = _mm_madd_epi16(*A, k2);
   const __m128i D = _mm_madd_epi16(*B, k2);
   *out = _mm_packs_epi32(C, D);
 }
 
-static void ConvertARGBToUV(const uint32_t* argb, uint8_t* u, uint8_t* v,
-                            int src_width, int do_store) {
+static void ConvertARGBToUV_SSE2(const uint32_t* argb,
+                                 uint8_t* u, uint8_t* v,
+                                 int src_width, int do_store) {
   const int max_width = src_width & ~31;
   int i;
   for (i = 0; i < max_width; i += 32, u += 16, v += 16) {
     __m128i rgb[6], U0, V0, U1, V1;
-    RGB32PackedToPlanar(&argb[i], rgb);
-    HorizontalAddPack(&rgb[0], &rgb[1], &rgb[0]);
-    HorizontalAddPack(&rgb[2], &rgb[3], &rgb[2]);
-    HorizontalAddPack(&rgb[4], &rgb[5], &rgb[4]);
-    ConvertRGBToUV(&rgb[0], &rgb[2], &rgb[4], &U0, &V0);
-
-    RGB32PackedToPlanar(&argb[i + 16], rgb);
-    HorizontalAddPack(&rgb[0], &rgb[1], &rgb[0]);
-    HorizontalAddPack(&rgb[2], &rgb[3], &rgb[2]);
-    HorizontalAddPack(&rgb[4], &rgb[5], &rgb[4]);
-    ConvertRGBToUV(&rgb[0], &rgb[2], &rgb[4], &U1, &V1);
+    RGB32PackedToPlanar_SSE2(&argb[i], rgb);
+    HorizontalAddPack_SSE2(&rgb[0], &rgb[1], &rgb[0]);
+    HorizontalAddPack_SSE2(&rgb[2], &rgb[3], &rgb[2]);
+    HorizontalAddPack_SSE2(&rgb[4], &rgb[5], &rgb[4]);
+    ConvertRGBToUV_SSE2(&rgb[0], &rgb[2], &rgb[4], &U0, &V0);
+
+    RGB32PackedToPlanar_SSE2(&argb[i + 16], rgb);
+    HorizontalAddPack_SSE2(&rgb[0], &rgb[1], &rgb[0]);
+    HorizontalAddPack_SSE2(&rgb[2], &rgb[3], &rgb[2]);
+    HorizontalAddPack_SSE2(&rgb[4], &rgb[5], &rgb[4]);
+    ConvertRGBToUV_SSE2(&rgb[0], &rgb[2], &rgb[4], &U1, &V1);
 
     U0 = _mm_packus_epi16(U0, U1);
     V0 = _mm_packus_epi16(V0, V1);
@@ -679,10 +691,9 @@ static void ConvertARGBToUV(const uint32_t* argb, uint8_t* u, uint8_t* v,
 }
 
 // Convert 16 packed ARGB 16b-values to r[], g[], b[]
-static WEBP_INLINE void RGBA32PackedToPlanar_16b(const uint16_t* const rgbx,
-                                                 __m128i* const r,
-                                                 __m128i* const g,
-                                                 __m128i* const b) {
+static WEBP_INLINE void RGBA32PackedToPlanar_16b_SSE2(
+    const uint16_t* const rgbx,
+    __m128i* const r, __m128i* const g, __m128i* const b) {
   const __m128i in0 = LOAD_16(rgbx +  0);  // r0 | g0 | b0 |x| r1 | g1 | b1 |x
   const __m128i in1 = LOAD_16(rgbx +  8);  // r2 | g2 | b2 |x| r3 | g3 | b3 |x
   const __m128i in2 = LOAD_16(rgbx + 16);  // r4 | ...
@@ -701,16 +712,16 @@ static WEBP_INLINE void RGBA32PackedToPlanar_16b(const uint16_t* const rgbx,
   *b = _mm_unpacklo_epi64(B1, B3);
 }
 
-static void ConvertRGBA32ToUV(const uint16_t* rgb,
-                              uint8_t* u, uint8_t* v, int width) {
+static void ConvertRGBA32ToUV_SSE2(const uint16_t* rgb,
+                                   uint8_t* u, uint8_t* v, int width) {
   const int max_width = width & ~15;
   const uint16_t* const last_rgb = rgb + 4 * max_width;
   while (rgb < last_rgb) {
     __m128i r, g, b, U0, V0, U1, V1;
-    RGBA32PackedToPlanar_16b(rgb +  0, &r, &g, &b);
-    ConvertRGBToUV(&r, &g, &b, &U0, &V0);
-    RGBA32PackedToPlanar_16b(rgb + 32, &r, &g, &b);
-    ConvertRGBToUV(&r, &g, &b, &U1, &V1);
+    RGBA32PackedToPlanar_16b_SSE2(rgb +  0, &r, &g, &b);
+    ConvertRGBToUV_SSE2(&r, &g, &b, &U0, &V0);
+    RGBA32PackedToPlanar_16b_SSE2(rgb + 32, &r, &g, &b);
+    ConvertRGBToUV_SSE2(&r, &g, &b, &U1, &V1);
     STORE_16(_mm_packus_epi16(U0, U1), u);
     STORE_16(_mm_packus_epi16(V0, V1), v);
     u += 16;
@@ -727,13 +738,13 @@ static void ConvertRGBA32ToUV(const uint16_t* rgb,
 extern void WebPInitConvertARGBToYUVSSE2(void);
 
 WEBP_TSAN_IGNORE_FUNCTION void WebPInitConvertARGBToYUVSSE2(void) {
-  WebPConvertARGBToY = ConvertARGBToY;
-  WebPConvertARGBToUV = ConvertARGBToUV;
+  WebPConvertARGBToY = ConvertARGBToY_SSE2;
+  WebPConvertARGBToUV = ConvertARGBToUV_SSE2;
 
-  WebPConvertRGB24ToY = ConvertRGB24ToY;
-  WebPConvertBGR24ToY = ConvertBGR24ToY;
+  WebPConvertRGB24ToY = ConvertRGB24ToY_SSE2;
+  WebPConvertBGR24ToY = ConvertBGR24ToY_SSE2;
 
-  WebPConvertRGBA32ToUV = ConvertRGBA32ToUV;
+  WebPConvertRGBA32ToUV = ConvertRGBA32ToUV_SSE2;
 }
 
 //------------------------------------------------------------------------------
diff --git a/media/libwebp/dsp/yuv_sse41.c b/media/libwebp/dsp/yuv_sse41.c
new file mode 100644
index 0000000000..95ab7ad14e
--- /dev/null
+++ b/media/libwebp/dsp/yuv_sse41.c
@@ -0,0 +1,613 @@
+// Copyright 2014 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+// YUV->RGB conversion functions
+//
+// Author: Skal (pascal.massimino@gmail.com)
+
+#include "../dsp/yuv.h"
+
+#if defined(WEBP_USE_SSE41)
+
+#include "../dsp/common_sse41.h"
+#include <stdlib.h>
+#include <smmintrin.h>
+
+//-----------------------------------------------------------------------------
+// Convert spans of 32 pixels to various RGB formats for the fancy upsampler.
+
+// These constants are 14b fixed-point version of ITU-R BT.601 constants.
+// R = (19077 * y             + 26149 * v - 14234) >> 6
+// G = (19077 * y -  6419 * u - 13320 * v +  8708) >> 6
+// B = (19077 * y + 33050 * u             - 17685) >> 6
+static void ConvertYUV444ToRGB_SSE41(const __m128i* const Y0,
+                                     const __m128i* const U0,
+                                     const __m128i* const V0,
+                                     __m128i* const R,
+                                     __m128i* const G,
+                                     __m128i* const B) {
+  const __m128i k19077 = _mm_set1_epi16(19077);
+  const __m128i k26149 = _mm_set1_epi16(26149);
+  const __m128i k14234 = _mm_set1_epi16(14234);
+  // 33050 doesn't fit in a signed short: only use this with unsigned arithmetic
+  const __m128i k33050 = _mm_set1_epi16((short)33050);
+  const __m128i k17685 = _mm_set1_epi16(17685);
+  const __m128i k6419  = _mm_set1_epi16(6419);
+  const __m128i k13320 = _mm_set1_epi16(13320);
+  const __m128i k8708  = _mm_set1_epi16(8708);
+
+  const __m128i Y1 = _mm_mulhi_epu16(*Y0, k19077);
+
+  const __m128i R0 = _mm_mulhi_epu16(*V0, k26149);
+  const __m128i R1 = _mm_sub_epi16(Y1, k14234);
+  const __m128i R2 = _mm_add_epi16(R1, R0);
+
+  const __m128i G0 = _mm_mulhi_epu16(*U0, k6419);
+  const __m128i G1 = _mm_mulhi_epu16(*V0, k13320);
+  const __m128i G2 = _mm_add_epi16(Y1, k8708);
+  const __m128i G3 = _mm_add_epi16(G0, G1);
+  const __m128i G4 = _mm_sub_epi16(G2, G3);
+
+  // be careful with the saturated *unsigned* arithmetic here!
+  const __m128i B0 = _mm_mulhi_epu16(*U0, k33050);
+  const __m128i B1 = _mm_adds_epu16(B0, Y1);
+  const __m128i B2 = _mm_subs_epu16(B1, k17685);
+
+  // use logical shift for B2, which can be larger than 32767
+  *R = _mm_srai_epi16(R2, 6);   // range: [-14234, 30815]
+  *G = _mm_srai_epi16(G4, 6);   // range: [-10953, 27710]
+  *B = _mm_srli_epi16(B2, 6);   // range: [0, 34238]
+}
+
+// Load the bytes into the *upper* part of 16b words. That's "<< 8", basically.
+static WEBP_INLINE __m128i Load_HI_16_SSE41(const uint8_t* src) {
+  const __m128i zero = _mm_setzero_si128();
+  return _mm_unpacklo_epi8(zero, _mm_loadl_epi64((const __m128i*)src));
+}
+
+// Load and replicate the U/V samples
+static WEBP_INLINE __m128i Load_UV_HI_8_SSE41(const uint8_t* src) {
+  const __m128i zero = _mm_setzero_si128();
+  const __m128i tmp0 = _mm_cvtsi32_si128(*(const uint32_t*)src);
+  const __m128i tmp1 = _mm_unpacklo_epi8(zero, tmp0);
+  return _mm_unpacklo_epi16(tmp1, tmp1);   // replicate samples
+}
+
+// Convert 32 samples of YUV444 to R/G/B
+static void YUV444ToRGB_SSE41(const uint8_t* const y,
+                              const uint8_t* const u,
+                              const uint8_t* const v,
+                              __m128i* const R, __m128i* const G,
+                              __m128i* const B) {
+  const __m128i Y0 = Load_HI_16_SSE41(y), U0 = Load_HI_16_SSE41(u),
+                V0 = Load_HI_16_SSE41(v);
+  ConvertYUV444ToRGB_SSE41(&Y0, &U0, &V0, R, G, B);
+}
+
+// Convert 32 samples of YUV420 to R/G/B
+static void YUV420ToRGB_SSE41(const uint8_t* const y,
+                              const uint8_t* const u,
+                              const uint8_t* const v,
+                              __m128i* const R, __m128i* const G,
+                              __m128i* const B) {
+  const __m128i Y0 = Load_HI_16_SSE41(y), U0 = Load_UV_HI_8_SSE41(u),
+                V0 = Load_UV_HI_8_SSE41(v);
+  ConvertYUV444ToRGB_SSE41(&Y0, &U0, &V0, R, G, B);
+}
+
+// Pack the planar buffers
+// rrrr... rrrr... gggg... gggg... bbbb... bbbb....
+// triplet by triplet in the output buffer rgb as rgbrgbrgbrgb ...
+static WEBP_INLINE void PlanarTo24b_SSE41(
+    __m128i* const in0, __m128i* const in1, __m128i* const in2,
+    __m128i* const in3, __m128i* const in4, __m128i* const in5,
+    uint8_t* const rgb) {
+  // The input is 6 registers of sixteen 8b but for the sake of explanation,
+  // let's take 6 registers of four 8b values.
+  // To pack, we will keep taking one every two 8b integer and move it
+  // around as follows:
+  // Input:
+  //   r0r1r2r3 | r4r5r6r7 | g0g1g2g3 | g4g5g6g7 | b0b1b2b3 | b4b5b6b7
+  // Split the 6 registers in two sets of 3 registers: the first set as the even
+  // 8b bytes, the second the odd ones:
+  //   r0r2r4r6 | g0g2g4g6 | b0b2b4b6 | r1r3r5r7 | g1g3g5g7 | b1b3b5b7
+  // Repeat the same permutations twice more:
+  //   r0r4g0g4 | b0b4r1r5 | g1g5b1b5 | r2r6g2g6 | b2b6r3r7 | g3g7b3b7
+  //   r0g0b0r1 | g1b1r2g2 | b2r3g3b3 | r4g4b4r5 | g5b5r6g6 | b6r7g7b7
+  VP8PlanarTo24b_SSE41(in0, in1, in2, in3, in4, in5);
+
+  _mm_storeu_si128((__m128i*)(rgb +  0), *in0);
+  _mm_storeu_si128((__m128i*)(rgb + 16), *in1);
+  _mm_storeu_si128((__m128i*)(rgb + 32), *in2);
+  _mm_storeu_si128((__m128i*)(rgb + 48), *in3);
+  _mm_storeu_si128((__m128i*)(rgb + 64), *in4);
+  _mm_storeu_si128((__m128i*)(rgb + 80), *in5);
+}
+
+void VP8YuvToRgb32_SSE41(const uint8_t* y, const uint8_t* u, const uint8_t* v,
+                         uint8_t* dst) {
+  __m128i R0, R1, R2, R3, G0, G1, G2, G3, B0, B1, B2, B3;
+  __m128i rgb0, rgb1, rgb2, rgb3, rgb4, rgb5;
+
+  YUV444ToRGB_SSE41(y + 0, u + 0, v + 0, &R0, &G0, &B0);
+  YUV444ToRGB_SSE41(y + 8, u + 8, v + 8, &R1, &G1, &B1);
+  YUV444ToRGB_SSE41(y + 16, u + 16, v + 16, &R2, &G2, &B2);
+  YUV444ToRGB_SSE41(y + 24, u + 24, v + 24, &R3, &G3, &B3);
+
+  // Cast to 8b and store as RRRRGGGGBBBB.
+  rgb0 = _mm_packus_epi16(R0, R1);
+  rgb1 = _mm_packus_epi16(R2, R3);
+  rgb2 = _mm_packus_epi16(G0, G1);
+  rgb3 = _mm_packus_epi16(G2, G3);
+  rgb4 = _mm_packus_epi16(B0, B1);
+  rgb5 = _mm_packus_epi16(B2, B3);
+
+  // Pack as RGBRGBRGBRGB.
+  PlanarTo24b_SSE41(&rgb0, &rgb1, &rgb2, &rgb3, &rgb4, &rgb5, dst);
+}
+
+void VP8YuvToBgr32_SSE41(const uint8_t* y, const uint8_t* u, const uint8_t* v,
+                         uint8_t* dst) {
+  __m128i R0, R1, R2, R3, G0, G1, G2, G3, B0, B1, B2, B3;
+  __m128i bgr0, bgr1, bgr2, bgr3, bgr4, bgr5;
+
+  YUV444ToRGB_SSE41(y +  0, u +  0, v +  0, &R0, &G0, &B0);
+  YUV444ToRGB_SSE41(y +  8, u +  8, v +  8, &R1, &G1, &B1);
+  YUV444ToRGB_SSE41(y + 16, u + 16, v + 16, &R2, &G2, &B2);
+  YUV444ToRGB_SSE41(y + 24, u + 24, v + 24, &R3, &G3, &B3);
+
+  // Cast to 8b and store as BBBBGGGGRRRR.
+  bgr0 = _mm_packus_epi16(B0, B1);
+  bgr1 = _mm_packus_epi16(B2, B3);
+  bgr2 = _mm_packus_epi16(G0, G1);
+  bgr3 = _mm_packus_epi16(G2, G3);
+  bgr4 = _mm_packus_epi16(R0, R1);
+  bgr5= _mm_packus_epi16(R2, R3);
+
+  // Pack as BGRBGRBGRBGR.
+  PlanarTo24b_SSE41(&bgr0, &bgr1, &bgr2, &bgr3, &bgr4, &bgr5, dst);
+}
+
+//-----------------------------------------------------------------------------
+// Arbitrary-length row conversion functions
+
+static void YuvToRgbRow_SSE41(const uint8_t* y,
+                              const uint8_t* u, const uint8_t* v,
+                              uint8_t* dst, int len) {
+  int n;
+  for (n = 0; n + 32 <= len; n += 32, dst += 32 * 3) {
+    __m128i R0, R1, R2, R3, G0, G1, G2, G3, B0, B1, B2, B3;
+    __m128i rgb0, rgb1, rgb2, rgb3, rgb4, rgb5;
+
+    YUV420ToRGB_SSE41(y +  0, u +  0, v +  0, &R0, &G0, &B0);
+    YUV420ToRGB_SSE41(y +  8, u +  4, v +  4, &R1, &G1, &B1);
+    YUV420ToRGB_SSE41(y + 16, u +  8, v +  8, &R2, &G2, &B2);
+    YUV420ToRGB_SSE41(y + 24, u + 12, v + 12, &R3, &G3, &B3);
+
+    // Cast to 8b and store as RRRRGGGGBBBB.
+    rgb0 = _mm_packus_epi16(R0, R1);
+    rgb1 = _mm_packus_epi16(R2, R3);
+    rgb2 = _mm_packus_epi16(G0, G1);
+    rgb3 = _mm_packus_epi16(G2, G3);
+    rgb4 = _mm_packus_epi16(B0, B1);
+    rgb5 = _mm_packus_epi16(B2, B3);
+
+    // Pack as RGBRGBRGBRGB.
+    PlanarTo24b_SSE41(&rgb0, &rgb1, &rgb2, &rgb3, &rgb4, &rgb5, dst);
+
+    y += 32;
+    u += 16;
+    v += 16;
+  }
+  for (; n < len; ++n) {   // Finish off
+    VP8YuvToRgb(y[0], u[0], v[0], dst);
+    dst += 3;
+    y += 1;
+    u += (n & 1);
+    v += (n & 1);
+  }
+}
+
+static void YuvToBgrRow_SSE41(const uint8_t* y,
+                              const uint8_t* u, const uint8_t* v,
+                              uint8_t* dst, int len) {
+  int n;
+  for (n = 0; n + 32 <= len; n += 32, dst += 32 * 3) {
+    __m128i R0, R1, R2, R3, G0, G1, G2, G3, B0, B1, B2, B3;
+    __m128i bgr0, bgr1, bgr2, bgr3, bgr4, bgr5;
+
+    YUV420ToRGB_SSE41(y +  0, u +  0, v +  0, &R0, &G0, &B0);
+    YUV420ToRGB_SSE41(y +  8, u +  4, v +  4, &R1, &G1, &B1);
+    YUV420ToRGB_SSE41(y + 16, u +  8, v +  8, &R2, &G2, &B2);
+    YUV420ToRGB_SSE41(y + 24, u + 12, v + 12, &R3, &G3, &B3);
+
+    // Cast to 8b and store as BBBBGGGGRRRR.
+    bgr0 = _mm_packus_epi16(B0, B1);
+    bgr1 = _mm_packus_epi16(B2, B3);
+    bgr2 = _mm_packus_epi16(G0, G1);
+    bgr3 = _mm_packus_epi16(G2, G3);
+    bgr4 = _mm_packus_epi16(R0, R1);
+    bgr5 = _mm_packus_epi16(R2, R3);
+
+    // Pack as BGRBGRBGRBGR.
+    PlanarTo24b_SSE41(&bgr0, &bgr1, &bgr2, &bgr3, &bgr4, &bgr5, dst);
+
+    y += 32;
+    u += 16;
+    v += 16;
+  }
+  for (; n < len; ++n) {   // Finish off
+    VP8YuvToBgr(y[0], u[0], v[0], dst);
+    dst += 3;
+    y += 1;
+    u += (n & 1);
+    v += (n & 1);
+  }
+}
+
+//------------------------------------------------------------------------------
+// Entry point
+
+extern void WebPInitSamplersSSE41(void);
+
+WEBP_TSAN_IGNORE_FUNCTION void WebPInitSamplersSSE41(void) {
+  WebPSamplers[MODE_RGB]  = YuvToRgbRow_SSE41;
+  WebPSamplers[MODE_BGR]  = YuvToBgrRow_SSE41;
+}
+
+//------------------------------------------------------------------------------
+// RGB24/32 -> YUV converters
+
+// Load eight 16b-words from *src.
+#define LOAD_16(src) _mm_loadu_si128((const __m128i*)(src))
+// Store either 16b-words into *dst
+#define STORE_16(V, dst) _mm_storeu_si128((__m128i*)(dst), (V))
+
+#define WEBP_SSE41_SHUFF(OUT)  do {                  \
+  const __m128i tmp0 = _mm_shuffle_epi8(A0, shuff0); \
+  const __m128i tmp1 = _mm_shuffle_epi8(A1, shuff1); \
+  const __m128i tmp2 = _mm_shuffle_epi8(A2, shuff2); \
+  const __m128i tmp3 = _mm_shuffle_epi8(A3, shuff0); \
+  const __m128i tmp4 = _mm_shuffle_epi8(A4, shuff1); \
+  const __m128i tmp5 = _mm_shuffle_epi8(A5, shuff2); \
+                                                     \
+  /* OR everything to get one channel */             \
+  const __m128i tmp6 = _mm_or_si128(tmp0, tmp1);     \
+  const __m128i tmp7 = _mm_or_si128(tmp3, tmp4);     \
+  out[OUT + 0] = _mm_or_si128(tmp6, tmp2);           \
+  out[OUT + 1] = _mm_or_si128(tmp7, tmp5);           \
+} while (0);
+
+// Unpack the 8b input rgbrgbrgbrgb ... as contiguous registers:
+// rrrr... rrrr... gggg... gggg... bbbb... bbbb....
+// Similar to PlanarTo24bHelper(), but in reverse order.
+static WEBP_INLINE void RGB24PackedToPlanar_SSE41(
+    const uint8_t* const rgb, __m128i* const out /*out[6]*/) {
+  const __m128i A0 = _mm_loadu_si128((const __m128i*)(rgb +  0));
+  const __m128i A1 = _mm_loadu_si128((const __m128i*)(rgb + 16));
+  const __m128i A2 = _mm_loadu_si128((const __m128i*)(rgb + 32));
+  const __m128i A3 = _mm_loadu_si128((const __m128i*)(rgb + 48));
+  const __m128i A4 = _mm_loadu_si128((const __m128i*)(rgb + 64));
+  const __m128i A5 = _mm_loadu_si128((const __m128i*)(rgb + 80));
+
+  // Compute RR.
+  {
+    const __m128i shuff0 = _mm_set_epi8(
+        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 15, 12, 9, 6, 3, 0);
+    const __m128i shuff1 = _mm_set_epi8(
+        -1, -1, -1, -1, -1, 14, 11, 8, 5, 2, -1, -1, -1, -1, -1, -1);
+    const __m128i shuff2 = _mm_set_epi8(
+        13, 10, 7, 4, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1);
+    WEBP_SSE41_SHUFF(0)
+  }
+  // Compute GG.
+  {
+    const __m128i shuff0 = _mm_set_epi8(
+        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 13, 10, 7, 4, 1);
+    const __m128i shuff1 = _mm_set_epi8(
+        -1, -1, -1, -1, -1, 15, 12, 9, 6, 3, 0, -1, -1, -1, -1, -1);
+    const __m128i shuff2 = _mm_set_epi8(
+        14, 11, 8, 5, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1);
+    WEBP_SSE41_SHUFF(2)
+  }
+  // Compute BB.
+  {
+    const __m128i shuff0 = _mm_set_epi8(
+        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 14, 11, 8, 5, 2);
+    const __m128i shuff1 = _mm_set_epi8(
+        -1, -1, -1, -1, -1, -1, 13, 10, 7, 4, 1, -1, -1, -1, -1, -1);
+    const __m128i shuff2 = _mm_set_epi8(
+        15, 12, 9, 6, 3, 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1);
+    WEBP_SSE41_SHUFF(4)
+  }
+}
+
+#undef WEBP_SSE41_SHUFF
+
+// Convert 8 packed ARGB to r[], g[], b[]
+static WEBP_INLINE void RGB32PackedToPlanar_SSE41(
+    const uint32_t* const argb, __m128i* const rgb /*in[6]*/) {
+  const __m128i zero = _mm_setzero_si128();
+  __m128i a0 = LOAD_16(argb + 0);
+  __m128i a1 = LOAD_16(argb + 4);
+  __m128i a2 = LOAD_16(argb + 8);
+  __m128i a3 = LOAD_16(argb + 12);
+  VP8L32bToPlanar_SSE41(&a0, &a1, &a2, &a3);
+  rgb[0] = _mm_unpacklo_epi8(a1, zero);
+  rgb[1] = _mm_unpackhi_epi8(a1, zero);
+  rgb[2] = _mm_unpacklo_epi8(a2, zero);
+  rgb[3] = _mm_unpackhi_epi8(a2, zero);
+  rgb[4] = _mm_unpacklo_epi8(a3, zero);
+  rgb[5] = _mm_unpackhi_epi8(a3, zero);
+}
+
+// This macro computes (RG * MULT_RG + GB * MULT_GB + ROUNDER) >> DESCALE_FIX
+// It's a macro and not a function because we need to use immediate values with
+// srai_epi32, e.g.
+#define TRANSFORM(RG_LO, RG_HI, GB_LO, GB_HI, MULT_RG, MULT_GB, \
+                  ROUNDER, DESCALE_FIX, OUT) do {               \
+  const __m128i V0_lo = _mm_madd_epi16(RG_LO, MULT_RG);         \
+  const __m128i V0_hi = _mm_madd_epi16(RG_HI, MULT_RG);         \
+  const __m128i V1_lo = _mm_madd_epi16(GB_LO, MULT_GB);         \
+  const __m128i V1_hi = _mm_madd_epi16(GB_HI, MULT_GB);         \
+  const __m128i V2_lo = _mm_add_epi32(V0_lo, V1_lo);            \
+  const __m128i V2_hi = _mm_add_epi32(V0_hi, V1_hi);            \
+  const __m128i V3_lo = _mm_add_epi32(V2_lo, ROUNDER);          \
+  const __m128i V3_hi = _mm_add_epi32(V2_hi, ROUNDER);          \
+  const __m128i V5_lo = _mm_srai_epi32(V3_lo, DESCALE_FIX);     \
+  const __m128i V5_hi = _mm_srai_epi32(V3_hi, DESCALE_FIX);     \
+  (OUT) = _mm_packs_epi32(V5_lo, V5_hi);                        \
+} while (0)
+
+#define MK_CST_16(A, B) _mm_set_epi16((B), (A), (B), (A), (B), (A), (B), (A))
+static WEBP_INLINE void ConvertRGBToY_SSE41(const __m128i* const R,
+                                            const __m128i* const G,
+                                            const __m128i* const B,
+                                            __m128i* const Y) {
+  const __m128i kRG_y = MK_CST_16(16839, 33059 - 16384);
+  const __m128i kGB_y = MK_CST_16(16384, 6420);
+  const __m128i kHALF_Y = _mm_set1_epi32((16 << YUV_FIX) + YUV_HALF);
+
+  const __m128i RG_lo = _mm_unpacklo_epi16(*R, *G);
+  const __m128i RG_hi = _mm_unpackhi_epi16(*R, *G);
+  const __m128i GB_lo = _mm_unpacklo_epi16(*G, *B);
+  const __m128i GB_hi = _mm_unpackhi_epi16(*G, *B);
+  TRANSFORM(RG_lo, RG_hi, GB_lo, GB_hi, kRG_y, kGB_y, kHALF_Y, YUV_FIX, *Y);
+}
+
+static WEBP_INLINE void ConvertRGBToUV_SSE41(const __m128i* const R,
+                                             const __m128i* const G,
+                                             const __m128i* const B,
+                                             __m128i* const U,
+                                             __m128i* const V) {
+  const __m128i kRG_u = MK_CST_16(-9719, -19081);
+  const __m128i kGB_u = MK_CST_16(0, 28800);
+  const __m128i kRG_v = MK_CST_16(28800, 0);
+  const __m128i kGB_v = MK_CST_16(-24116, -4684);
+  const __m128i kHALF_UV = _mm_set1_epi32(((128 << YUV_FIX) + YUV_HALF) << 2);
+
+  const __m128i RG_lo = _mm_unpacklo_epi16(*R, *G);
+  const __m128i RG_hi = _mm_unpackhi_epi16(*R, *G);
+  const __m128i GB_lo = _mm_unpacklo_epi16(*G, *B);
+  const __m128i GB_hi = _mm_unpackhi_epi16(*G, *B);
+  TRANSFORM(RG_lo, RG_hi, GB_lo, GB_hi, kRG_u, kGB_u,
+            kHALF_UV, YUV_FIX + 2, *U);
+  TRANSFORM(RG_lo, RG_hi, GB_lo, GB_hi, kRG_v, kGB_v,
+            kHALF_UV, YUV_FIX + 2, *V);
+}
+
+#undef MK_CST_16
+#undef TRANSFORM
+
+static void ConvertRGB24ToY_SSE41(const uint8_t* rgb, uint8_t* y, int width) {
+  const int max_width = width & ~31;
+  int i;
+  for (i = 0; i < max_width; rgb += 3 * 16 * 2) {
+    __m128i rgb_plane[6];
+    int j;
+
+    RGB24PackedToPlanar_SSE41(rgb, rgb_plane);
+
+    for (j = 0; j < 2; ++j, i += 16) {
+      const __m128i zero = _mm_setzero_si128();
+      __m128i r, g, b, Y0, Y1;
+
+      // Convert to 16-bit Y.
+      r = _mm_unpacklo_epi8(rgb_plane[0 + j], zero);
+      g = _mm_unpacklo_epi8(rgb_plane[2 + j], zero);
+      b = _mm_unpacklo_epi8(rgb_plane[4 + j], zero);
+      ConvertRGBToY_SSE41(&r, &g, &b, &Y0);
+
+      // Convert to 16-bit Y.
+      r = _mm_unpackhi_epi8(rgb_plane[0 + j], zero);
+      g = _mm_unpackhi_epi8(rgb_plane[2 + j], zero);
+      b = _mm_unpackhi_epi8(rgb_plane[4 + j], zero);
+      ConvertRGBToY_SSE41(&r, &g, &b, &Y1);
+
+      // Cast to 8-bit and store.
+      STORE_16(_mm_packus_epi16(Y0, Y1), y + i);
+    }
+  }
+  for (; i < width; ++i, rgb += 3) {   // left-over
+    y[i] = VP8RGBToY(rgb[0], rgb[1], rgb[2], YUV_HALF);
+  }
+}
+
+static void ConvertBGR24ToY_SSE41(const uint8_t* bgr, uint8_t* y, int width) {
+  const int max_width = width & ~31;
+  int i;
+  for (i = 0; i < max_width; bgr += 3 * 16 * 2) {
+    __m128i bgr_plane[6];
+    int j;
+
+    RGB24PackedToPlanar_SSE41(bgr, bgr_plane);
+
+    for (j = 0; j < 2; ++j, i += 16) {
+      const __m128i zero = _mm_setzero_si128();
+      __m128i r, g, b, Y0, Y1;
+
+      // Convert to 16-bit Y.
+      b = _mm_unpacklo_epi8(bgr_plane[0 + j], zero);
+      g = _mm_unpacklo_epi8(bgr_plane[2 + j], zero);
+      r = _mm_unpacklo_epi8(bgr_plane[4 + j], zero);
+      ConvertRGBToY_SSE41(&r, &g, &b, &Y0);
+
+      // Convert to 16-bit Y.
+      b = _mm_unpackhi_epi8(bgr_plane[0 + j], zero);
+      g = _mm_unpackhi_epi8(bgr_plane[2 + j], zero);
+      r = _mm_unpackhi_epi8(bgr_plane[4 + j], zero);
+      ConvertRGBToY_SSE41(&r, &g, &b, &Y1);
+
+      // Cast to 8-bit and store.
+      STORE_16(_mm_packus_epi16(Y0, Y1), y + i);
+    }
+  }
+  for (; i < width; ++i, bgr += 3) {  // left-over
+    y[i] = VP8RGBToY(bgr[2], bgr[1], bgr[0], YUV_HALF);
+  }
+}
+
+static void ConvertARGBToY_SSE41(const uint32_t* argb, uint8_t* y, int width) {
+  const int max_width = width & ~15;
+  int i;
+  for (i = 0; i < max_width; i += 16) {
+    __m128i Y0, Y1, rgb[6];
+    RGB32PackedToPlanar_SSE41(&argb[i], rgb);
+    ConvertRGBToY_SSE41(&rgb[0], &rgb[2], &rgb[4], &Y0);
+    ConvertRGBToY_SSE41(&rgb[1], &rgb[3], &rgb[5], &Y1);
+    STORE_16(_mm_packus_epi16(Y0, Y1), y + i);
+  }
+  for (; i < width; ++i) {   // left-over
+    const uint32_t p = argb[i];
+    y[i] = VP8RGBToY((p >> 16) & 0xff, (p >> 8) & 0xff, (p >>  0) & 0xff,
+                     YUV_HALF);
+  }
+}
+
+// Horizontal add (doubled) of two 16b values, result is 16b.
+// in: A | B | C | D | ... -> out: 2*(A+B) | 2*(C+D) | ...
+static void HorizontalAddPack_SSE41(const __m128i* const A,
+                                    const __m128i* const B,
+                                    __m128i* const out) {
+  const __m128i k2 = _mm_set1_epi16(2);
+  const __m128i C = _mm_madd_epi16(*A, k2);
+  const __m128i D = _mm_madd_epi16(*B, k2);
+  *out = _mm_packs_epi32(C, D);
+}
+
+static void ConvertARGBToUV_SSE41(const uint32_t* argb,
+                                  uint8_t* u, uint8_t* v,
+                                  int src_width, int do_store) {
+  const int max_width = src_width & ~31;
+  int i;
+  for (i = 0; i < max_width; i += 32, u += 16, v += 16) {
+    __m128i rgb[6], U0, V0, U1, V1;
+    RGB32PackedToPlanar_SSE41(&argb[i], rgb);
+    HorizontalAddPack_SSE41(&rgb[0], &rgb[1], &rgb[0]);
+    HorizontalAddPack_SSE41(&rgb[2], &rgb[3], &rgb[2]);
+    HorizontalAddPack_SSE41(&rgb[4], &rgb[5], &rgb[4]);
+    ConvertRGBToUV_SSE41(&rgb[0], &rgb[2], &rgb[4], &U0, &V0);
+
+    RGB32PackedToPlanar_SSE41(&argb[i + 16], rgb);
+    HorizontalAddPack_SSE41(&rgb[0], &rgb[1], &rgb[0]);
+    HorizontalAddPack_SSE41(&rgb[2], &rgb[3], &rgb[2]);
+    HorizontalAddPack_SSE41(&rgb[4], &rgb[5], &rgb[4]);
+    ConvertRGBToUV_SSE41(&rgb[0], &rgb[2], &rgb[4], &U1, &V1);
+
+    U0 = _mm_packus_epi16(U0, U1);
+    V0 = _mm_packus_epi16(V0, V1);
+    if (!do_store) {
+      const __m128i prev_u = LOAD_16(u);
+      const __m128i prev_v = LOAD_16(v);
+      U0 = _mm_avg_epu8(U0, prev_u);
+      V0 = _mm_avg_epu8(V0, prev_v);
+    }
+    STORE_16(U0, u);
+    STORE_16(V0, v);
+  }
+  if (i < src_width) {  // left-over
+    WebPConvertARGBToUV_C(argb + i, u, v, src_width - i, do_store);
+  }
+}
+
+// Convert 16 packed ARGB 16b-values to r[], g[], b[]
+static WEBP_INLINE void RGBA32PackedToPlanar_16b_SSE41(
+    const uint16_t* const rgbx,
+    __m128i* const r, __m128i* const g, __m128i* const b) {
+  const __m128i in0 = LOAD_16(rgbx +  0);  // r0 | g0 | b0 |x| r1 | g1 | b1 |x
+  const __m128i in1 = LOAD_16(rgbx +  8);  // r2 | g2 | b2 |x| r3 | g3 | b3 |x
+  const __m128i in2 = LOAD_16(rgbx + 16);  // r4 | ...
+  const __m128i in3 = LOAD_16(rgbx + 24);  // r6 | ...
+  // aarrggbb as 16-bit.
+  const __m128i shuff0 =
+      _mm_set_epi8(-1, -1, -1, -1, 13, 12, 5, 4, 11, 10, 3, 2, 9, 8, 1, 0);
+  const __m128i shuff1 =
+      _mm_set_epi8(13, 12, 5, 4, -1, -1, -1, -1, 11, 10, 3, 2, 9, 8, 1, 0);
+  const __m128i A0 = _mm_shuffle_epi8(in0, shuff0);
+  const __m128i A1 = _mm_shuffle_epi8(in1, shuff1);
+  const __m128i A2 = _mm_shuffle_epi8(in2, shuff0);
+  const __m128i A3 = _mm_shuffle_epi8(in3, shuff1);
+  // R0R1G0G1
+  // B0B1****
+  // R2R3G2G3
+  // B2B3****
+  // (OR is used to free port 5 for the unpack)
+  const __m128i B0 = _mm_unpacklo_epi32(A0, A1);
+  const __m128i B1 = _mm_or_si128(A0, A1);
+  const __m128i B2 = _mm_unpacklo_epi32(A2, A3);
+  const __m128i B3 = _mm_or_si128(A2, A3);
+  // Gather the channels.
+  *r = _mm_unpacklo_epi64(B0, B2);
+  *g = _mm_unpackhi_epi64(B0, B2);
+  *b = _mm_unpackhi_epi64(B1, B3);
+}
+
+static void ConvertRGBA32ToUV_SSE41(const uint16_t* rgb,
+                                    uint8_t* u, uint8_t* v, int width) {
+  const int max_width = width & ~15;
+  const uint16_t* const last_rgb = rgb + 4 * max_width;
+  while (rgb < last_rgb) {
+    __m128i r, g, b, U0, V0, U1, V1;
+    RGBA32PackedToPlanar_16b_SSE41(rgb +  0, &r, &g, &b);
+    ConvertRGBToUV_SSE41(&r, &g, &b, &U0, &V0);
+    RGBA32PackedToPlanar_16b_SSE41(rgb + 32, &r, &g, &b);
+    ConvertRGBToUV_SSE41(&r, &g, &b, &U1, &V1);
+    STORE_16(_mm_packus_epi16(U0, U1), u);
+    STORE_16(_mm_packus_epi16(V0, V1), v);
+    u += 16;
+    v += 16;
+    rgb += 2 * 32;
+  }
+  if (max_width < width) {  // left-over
+    WebPConvertRGBA32ToUV_C(rgb, u, v, width - max_width);
+  }
+}
+
+//------------------------------------------------------------------------------
+
+extern void WebPInitConvertARGBToYUVSSE41(void);
+
+WEBP_TSAN_IGNORE_FUNCTION void WebPInitConvertARGBToYUVSSE41(void) {
+  WebPConvertARGBToY = ConvertARGBToY_SSE41;
+  WebPConvertARGBToUV = ConvertARGBToUV_SSE41;
+
+  WebPConvertRGB24ToY = ConvertRGB24ToY_SSE41;
+  WebPConvertBGR24ToY = ConvertBGR24ToY_SSE41;
+
+  WebPConvertRGBA32ToUV = ConvertRGBA32ToUV_SSE41;
+}
+
+//------------------------------------------------------------------------------
+
+#else  // !WEBP_USE_SSE41
+
+WEBP_DSP_INIT_STUB(WebPInitSamplersSSE41)
+WEBP_DSP_INIT_STUB(WebPInitConvertARGBToYUVSSE41)
+
+#endif  // WEBP_USE_SSE41
diff --git a/media/libwebp/enc/backward_references_enc.h b/media/libwebp/enc/backward_references_enc.h
index 3a19aa763e..539e991cfc 100644
--- a/media/libwebp/enc/backward_references_enc.h
+++ b/media/libwebp/enc/backward_references_enc.h
@@ -10,8 +10,8 @@
 // Author: Jyrki Alakuijala (jyrki@google.com)
 //
 
-#ifndef WEBP_ENC_BACKWARD_REFERENCES_H_
-#define WEBP_ENC_BACKWARD_REFERENCES_H_
+#ifndef WEBP_ENC_BACKWARD_REFERENCES_ENC_H_
+#define WEBP_ENC_BACKWARD_REFERENCES_ENC_H_
 
 #include <assert.h>
 #include <stdlib.h>
@@ -91,11 +91,6 @@ static WEBP_INLINE uint32_t PixOrCopyLength(const PixOrCopy* const p) {
   return p->len;
 }
 
-static WEBP_INLINE uint32_t PixOrCopyArgb(const PixOrCopy* const p) {
-  assert(p->mode == kLiteral);
-  return p->argb_or_distance;
-}
-
 static WEBP_INLINE uint32_t PixOrCopyCacheIdx(const PixOrCopy* const p) {
   assert(p->mode == kCacheIdx);
   assert(p->argb_or_distance < (1U << MAX_COLOR_CACHE_BITS));
@@ -113,6 +108,16 @@ static WEBP_INLINE uint32_t PixOrCopyDistance(const PixOrCopy* const p) {
 #define HASH_BITS 18
 #define HASH_SIZE (1 << HASH_BITS)
 
+// If you change this, you need MAX_LENGTH_BITS + WINDOW_SIZE_BITS <= 32 as it
+// is used in VP8LHashChain.
+#define MAX_LENGTH_BITS 12
+#define WINDOW_SIZE_BITS 20
+// We want the max value to be attainable and stored in MAX_LENGTH_BITS bits.
+#define MAX_LENGTH ((1 << MAX_LENGTH_BITS) - 1)
+#if MAX_LENGTH_BITS + WINDOW_SIZE_BITS > 32
+#error "MAX_LENGTH_BITS + WINDOW_SIZE_BITS > 32"
+#endif
+
 typedef struct VP8LHashChain VP8LHashChain;
 struct VP8LHashChain {
   // The 20 most significant bits contain the offset at which the best match
@@ -134,6 +139,24 @@ int VP8LHashChainFill(VP8LHashChain* const p, int quality,
                       int low_effort);
 void VP8LHashChainClear(VP8LHashChain* const p);  // release memory
 
+static WEBP_INLINE int VP8LHashChainFindOffset(const VP8LHashChain* const p,
+                                               const int base_position) {
+  return p->offset_length_[base_position] >> MAX_LENGTH_BITS;
+}
+
+static WEBP_INLINE int VP8LHashChainFindLength(const VP8LHashChain* const p,
+                                               const int base_position) {
+  return p->offset_length_[base_position] & ((1U << MAX_LENGTH_BITS) - 1);
+}
+
+static WEBP_INLINE void VP8LHashChainFindCopy(const VP8LHashChain* const p,
+                                              int base_position,
+                                              int* const offset_ptr,
+                                              int* const length_ptr) {
+  *offset_ptr = VP8LHashChainFindOffset(p, base_position);
+  *length_ptr = VP8LHashChainFindLength(p, base_position);
+}
+
 // -----------------------------------------------------------------------------
 // VP8LBackwardRefs (block-based backward-references storage)
 
@@ -158,9 +181,6 @@ struct VP8LBackwardRefs {
 void VP8LBackwardRefsInit(VP8LBackwardRefs* const refs, int block_size);
 // Release memory for backward references.
 void VP8LBackwardRefsClear(VP8LBackwardRefs* const refs);
-// Copies the 'src' backward refs to the 'dst'. Returns 0 in case of error.
-int VP8LBackwardRefsCopy(const VP8LBackwardRefs* const src,
-                         VP8LBackwardRefs* const dst);
 
 // Cursor for iterating on references content
 typedef struct {
@@ -189,6 +209,12 @@ static WEBP_INLINE void VP8LRefsCursorNext(VP8LRefsCursor* const c) {
 // -----------------------------------------------------------------------------
 // Main entry points
 
+enum VP8LLZ77Type {
+  kLZ77Standard = 1,
+  kLZ77RLE = 2,
+  kLZ77Box = 4
+};
+
 // Evaluates best possible backward references for specified quality.
 // The input cache_bits to 'VP8LGetBackwardReferences' sets the maximum cache
 // bits to use (passing 0 implies disabling the local color cache).
@@ -197,11 +223,12 @@ static WEBP_INLINE void VP8LRefsCursorNext(VP8LRefsCursor* const c) {
 // refs[0] or refs[1].
 VP8LBackwardRefs* VP8LGetBackwardReferences(
     int width, int height, const uint32_t* const argb, int quality,
-    int low_effort, int* const cache_bits,
-    const VP8LHashChain* const hash_chain, VP8LBackwardRefs refs[2]);
+    int low_effort, int lz77_types_to_try, int* const cache_bits,
+    const VP8LHashChain* const hash_chain, VP8LBackwardRefs* const refs_tmp1,
+    VP8LBackwardRefs* const refs_tmp2);
 
 #ifdef __cplusplus
 }
 #endif
 
-#endif  // WEBP_ENC_BACKWARD_REFERENCES_H_
+#endif  // WEBP_ENC_BACKWARD_REFERENCES_ENC_H_
diff --git a/media/libwebp/enc/cost_enc.h b/media/libwebp/enc/cost_enc.h
index 99e4b37aa3..d731ee2fa9 100644
--- a/media/libwebp/enc/cost_enc.h
+++ b/media/libwebp/enc/cost_enc.h
@@ -11,12 +11,12 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#ifndef WEBP_ENC_COST_H_
-#define WEBP_ENC_COST_H_
+#ifndef WEBP_ENC_COST_ENC_H_
+#define WEBP_ENC_COST_ENC_H_
 
 #include <assert.h>
 #include <stdlib.h>
-#include "./vp8i_enc.h"
+#include "../enc/vp8i_enc.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -79,4 +79,4 @@ extern const uint16_t VP8FixedCostsI4[NUM_BMODES][NUM_BMODES][NUM_BMODES];
 }    // extern "C"
 #endif
 
-#endif  /* WEBP_ENC_COST_H_ */
+#endif  /* WEBP_ENC_COST_ENC_H_ */
diff --git a/media/libwebp/enc/histogram_enc.h b/media/libwebp/enc/histogram_enc.h
index a9d258a166..4fbb73702c 100644
--- a/media/libwebp/enc/histogram_enc.h
+++ b/media/libwebp/enc/histogram_enc.h
@@ -11,12 +11,12 @@
 //
 // Models the histograms of literal and distance codes.
 
-#ifndef WEBP_ENC_HISTOGRAM_H_
-#define WEBP_ENC_HISTOGRAM_H_
+#ifndef WEBP_ENC_HISTOGRAM_ENC_H_
+#define WEBP_ENC_HISTOGRAM_ENC_H_
 
 #include <string.h>
 
-#include "./backward_references_enc.h"
+#include "../enc/backward_references_enc.h"
 #include "../webp/format_constants.h"
 #include "../webp/types.h"
 
@@ -90,7 +90,9 @@ VP8LHistogram* VP8LAllocateHistogram(int cache_bits);
 
 // Accumulate a token 'v' into a histogram.
 void VP8LHistogramAddSinglePixOrCopy(VP8LHistogram* const histo,
-                                     const PixOrCopy* const v);
+                                     const PixOrCopy* const v,
+                                     int (*const distance_modifier)(int, int),
+                                     int distance_modifier_arg0);
 
 static WEBP_INLINE int VP8LHistogramNumCodes(int palette_code_bits) {
   return NUM_LITERAL_CODES + NUM_LENGTH_CODES +
@@ -103,14 +105,11 @@ int VP8LGetHistoImageSymbols(int xsize, int ysize,
                              int quality, int low_effort,
                              int histogram_bits, int cache_bits,
                              VP8LHistogramSet* const image_in,
-                             VP8LHistogramSet* const tmp_histos,
+                             VP8LHistogram* const tmp_histo,
                              uint16_t* const histogram_symbols);
 
 // Returns the entropy for the symbols in the input array.
-// Also sets trivial_symbol to the code value, if the array has only one code
-// value. Otherwise, set it to VP8L_NON_TRIVIAL_SYM.
-double VP8LBitsEntropy(const uint32_t* const array, int n,
-                       uint32_t* const trivial_symbol);
+double VP8LBitsEntropy(const uint32_t* const array, int n);
 
 // Estimate how many bits the combined entropy of literals and distance
 // approximately maps to.
@@ -120,4 +119,4 @@ double VP8LHistogramEstimateBits(const VP8LHistogram* const p);
 }
 #endif
 
-#endif  // WEBP_ENC_HISTOGRAM_H_
+#endif  // WEBP_ENC_HISTOGRAM_ENC_H_
diff --git a/media/libwebp/enc/vp8i_enc.h b/media/libwebp/enc/vp8i_enc.h
index 93c95ecbfb..8972d9f101 100644
--- a/media/libwebp/enc/vp8i_enc.h
+++ b/media/libwebp/enc/vp8i_enc.h
@@ -11,8 +11,8 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#ifndef WEBP_ENC_VP8ENCI_H_
-#define WEBP_ENC_VP8ENCI_H_
+#ifndef WEBP_ENC_VP8I_ENC_H_
+#define WEBP_ENC_VP8I_ENC_H_
 
 #include <string.h>     // for memcpy()
 #include "../dec/common_dec.h"
@@ -30,8 +30,8 @@ extern "C" {
 // Various defines and enums
 
 // version numbers
-#define ENC_MAJ_VERSION 0
-#define ENC_MIN_VERSION 6
+#define ENC_MAJ_VERSION 1
+#define ENC_MIN_VERSION 0
 #define ENC_REV_VERSION 0
 
 enum { MAX_LF_LEVELS = 64,       // Maximum loop filter level
@@ -75,10 +75,10 @@ typedef enum {   // Rate-distortion optimization levels
 #define U_OFF_ENC    (16)
 #define V_OFF_ENC    (16 + 8)
 
-extern const int VP8Scan[16];           // in quant.c
-extern const int VP8UVModeOffsets[4];   // in analyze.c
-extern const int VP8I16ModeOffsets[4];
-extern const int VP8I4ModeOffsets[NUM_BMODES];
+extern const uint16_t VP8Scan[16];
+extern const uint16_t VP8UVModeOffsets[4];
+extern const uint16_t VP8I16ModeOffsets[4];
+extern const uint16_t VP8I4ModeOffsets[NUM_BMODES];
 
 // Layout of prediction blocks
 // intra 16x16
@@ -120,6 +120,9 @@ static WEBP_INLINE int QUANTDIV(uint32_t n, uint32_t iQ, uint32_t B) {
 // Uncomment the following to remove token-buffer code:
 // #define DISABLE_TOKEN_BUFFER
 
+// quality below which error-diffusion is enabled
+#define ERROR_DIFFUSION_QUALITY 98
+
 //------------------------------------------------------------------------------
 // Headers
 
@@ -201,6 +204,8 @@ typedef struct {
   score_t i4_penalty_;   // penalty for using Intra4
 } VP8SegmentInfo;
 
+typedef int8_t DError[2 /* u/v */][2 /* top or left */];
+
 // Handy transient struct to accumulate score and info during RD-optimization
 // and mode evaluation.
 typedef struct {
@@ -213,6 +218,7 @@ typedef struct {
   uint8_t modes_i4[16];       // mode numbers for intra4 predictions
   int mode_uv;                // mode number of chroma prediction
   uint32_t nz;                // non-zero blocks
+  int8_t derr[2][3];          // DC diffusion errors for U/V for blocks #1/2/3
 } VP8ModeScore;
 
 // Iterator structure to iterate through macroblocks, pointing to the
@@ -242,6 +248,9 @@ typedef struct {
   int           count_down0_;      // starting counter value (for progress)
   int           percent0_;         // saved initial progress percent
 
+  DError        left_derr_;        // left error diffusion (u/v)
+  DError       *top_derr_;         // top diffusion error - NULL if disabled
+
   uint8_t* y_left_;    // left luma samples (addressable from index -1 to 15).
   uint8_t* u_left_;    // left u samples (addressable from index -1 to 7)
   uint8_t* v_left_;    // left v samples (addressable from index -1 to 7)
@@ -330,9 +339,6 @@ int VP8RecordCoeffTokens(int ctx, const struct VP8Residual* const res,
 // Estimate the final coded size given a set of 'probas'.
 size_t VP8EstimateTokenSize(VP8TBuffer* const b, const uint8_t* const probas);
 
-// unused for now
-void VP8TokenToStats(const VP8TBuffer* const b, proba_t* const stats);
-
 #endif  // !DISABLE_TOKEN_BUFFER
 
 //------------------------------------------------------------------------------
@@ -404,6 +410,7 @@ struct VP8Encoder {
   uint8_t*   uv_top_;    // top u/v samples.
                          // U and V are packed into 16 bytes (8 U + 8 V)
   LFStats*   lf_stats_;  // autofilter stats (if NULL, autofilter is off)
+  DError*    top_derr_;  // diffusion error (NULL if disabled)
 };
 
 //------------------------------------------------------------------------------
@@ -502,19 +509,10 @@ int WebPPictureAllocYUVA(WebPPicture* const picture, int width, int height);
 // compressibility (no guarantee, though). Assumes that pic->use_argb is true.
 void WebPCleanupTransparentAreaLossless(WebPPicture* const pic);
 
-  // in near_lossless.c
-// Near lossless preprocessing in RGB color-space.
-int VP8ApplyNearLossless(int xsize, int ysize, uint32_t* argb, int quality);
-// Near lossless adjustment for predictors.
-void VP8ApplyNearLosslessPredict(int xsize, int ysize, int pred_bits,
-                                 const uint32_t* argb_orig,
-                                 uint32_t* argb, uint32_t* argb_scratch,
-                                 const uint32_t* const transform_data,
-                                 int quality, int subtract_green);
 //------------------------------------------------------------------------------
 
 #ifdef __cplusplus
 }    // extern "C"
 #endif
 
-#endif  /* WEBP_ENC_VP8ENCI_H_ */
+#endif  /* WEBP_ENC_VP8I_ENC_H_ */
diff --git a/media/libwebp/enc/vp8li_enc.h b/media/libwebp/enc/vp8li_enc.h
index 8c5fbcbb2e..5dcba9ef0d 100644
--- a/media/libwebp/enc/vp8li_enc.h
+++ b/media/libwebp/enc/vp8li_enc.h
@@ -11,11 +11,20 @@
 //
 // Author: Vikas Arora (vikaas.arora@gmail.com)
 
-#ifndef WEBP_ENC_VP8LI_H_
-#define WEBP_ENC_VP8LI_H_
+#ifndef WEBP_ENC_VP8LI_ENC_H_
+#define WEBP_ENC_VP8LI_ENC_H_
 
-#include "./backward_references_enc.h"
-#include "./histogram_enc.h"
+#ifdef HAVE_CONFIG_H
+#include "../webp/config.h"
+#endif
+// Either WEBP_NEAR_LOSSLESS is defined as 0 in config.h when compiling to
+// disable near-lossless, or it is enabled by default.
+#ifndef WEBP_NEAR_LOSSLESS
+#define WEBP_NEAR_LOSSLESS 1
+#endif
+
+#include "../enc/backward_references_enc.h"
+#include "../enc/histogram_enc.h"
 #include "../utils/bit_writer_utils.h"
 #include "../webp/encode.h"
 #include "../webp/format_constants.h"
@@ -27,16 +36,24 @@ extern "C" {
 // maximum value of transform_bits_ in VP8LEncoder.
 #define MAX_TRANSFORM_BITS 6
 
+typedef enum {
+  kEncoderNone = 0,
+  kEncoderARGB,
+  kEncoderNearLossless,
+  kEncoderPalette
+} VP8LEncoderARGBContent;
+
 typedef struct {
   const WebPConfig* config_;      // user configuration and parameters
   const WebPPicture* pic_;        // input picture.
 
-  uint32_t* argb_;                // Transformed argb image data.
-  uint32_t* argb_scratch_;        // Scratch memory for argb rows
-                                  // (used for prediction).
-  uint32_t* transform_data_;      // Scratch memory for transform data.
-  uint32_t* transform_mem_;       // Currently allocated memory.
-  size_t    transform_mem_size_;  // Currently allocated memory size.
+  uint32_t* argb_;                       // Transformed argb image data.
+  VP8LEncoderARGBContent argb_content_;  // Content type of the argb buffer.
+  uint32_t* argb_scratch_;               // Scratch memory for argb rows
+                                         // (used for prediction).
+  uint32_t* transform_data_;             // Scratch memory for transform data.
+  uint32_t* transform_mem_;              // Currently allocated memory.
+  size_t    transform_mem_size_;         // Currently allocated memory size.
 
   int       current_width_;       // Corresponds to packed image width.
 
@@ -54,8 +71,7 @@ typedef struct {
   uint32_t palette_[MAX_PALETTE_SIZE];
 
   // Some 'scratch' (potentially large) objects.
-  struct VP8LBackwardRefs refs_[2];  // Backward Refs array corresponding to
-                                     // LZ77 & RLE coding.
+  struct VP8LBackwardRefs refs_[3];  // Backward Refs array for temporaries.
   VP8LHashChain hash_chain_;         // HashChain data for constructing
                                      // backward references.
 } VP8LEncoder;
@@ -75,6 +91,13 @@ WebPEncodingError VP8LEncodeStream(const WebPConfig* const config,
                                    const WebPPicture* const picture,
                                    VP8LBitWriter* const bw, int use_cache);
 
+#if (WEBP_NEAR_LOSSLESS == 1)
+// in near_lossless.c
+// Near lossless preprocessing in RGB color-space.
+int VP8ApplyNearLossless(const WebPPicture* const picture, int quality,
+                         uint32_t* const argb_dst);
+#endif
+
 //------------------------------------------------------------------------------
 // Image transforms in predictor.c.
 
@@ -92,4 +115,4 @@ void VP8LColorSpaceTransform(int width, int height, int bits, int quality,
 }    // extern "C"
 #endif
 
-#endif  /* WEBP_ENC_VP8LI_H_ */
+#endif  /* WEBP_ENC_VP8LI_ENC_H_ */
diff --git a/media/libwebp/utils/bit_reader_inl_utils.h b/media/libwebp/utils/bit_reader_inl_utils.h
index fd7fb0446c..2bb9a19182 100644
--- a/media/libwebp/utils/bit_reader_inl_utils.h
+++ b/media/libwebp/utils/bit_reader_inl_utils.h
@@ -13,8 +13,8 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#ifndef WEBP_UTILS_BIT_READER_INL_H_
-#define WEBP_UTILS_BIT_READER_INL_H_
+#ifndef WEBP_UTILS_BIT_READER_INL_UTILS_H_
+#define WEBP_UTILS_BIT_READER_INL_UTILS_H_
 
 #ifdef HAVE_CONFIG_H
 #include "../webp/config.h"
@@ -23,9 +23,9 @@
 #include <string.h>  // for memcpy
 
 #include "../dsp/dsp.h"
-#include "./bit_reader_utils.h"
-#include "./endian_inl_utils.h"
-#include "./utils.h"
+#include "../utils/bit_reader_utils.h"
+#include "../utils/endian_inl_utils.h"
+#include "../utils/utils.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -187,4 +187,4 @@ static WEBP_INLINE int VP8GetBitAlt(VP8BitReader* const br, int prob) {
 }    // extern "C"
 #endif
 
-#endif   // WEBP_UTILS_BIT_READER_INL_H_
+#endif   // WEBP_UTILS_BIT_READER_INL_UTILS_H_
diff --git a/media/libwebp/utils/bit_reader_utils.c b/media/libwebp/utils/bit_reader_utils.c
index c3157e8fe8..a7cb193bde 100644
--- a/media/libwebp/utils/bit_reader_utils.c
+++ b/media/libwebp/utils/bit_reader_utils.c
@@ -15,7 +15,7 @@
 #include "../webp/config.h"
 #endif
 
-#include "./bit_reader_inl_utils.h"
+#include "../utils/bit_reader_inl_utils.h"
 #include "../utils/utils.h"
 
 //------------------------------------------------------------------------------
diff --git a/media/libwebp/utils/bit_reader_utils.h b/media/libwebp/utils/bit_reader_utils.h
index ec3426cd11..53e9db6adb 100644
--- a/media/libwebp/utils/bit_reader_utils.h
+++ b/media/libwebp/utils/bit_reader_utils.h
@@ -12,8 +12,8 @@
 // Author: Skal (pascal.massimino@gmail.com)
 //         Vikas Arora (vikaas.arora@gmail.com)
 
-#ifndef WEBP_UTILS_BIT_READER_H_
-#define WEBP_UTILS_BIT_READER_H_
+#ifndef WEBP_UTILS_BIT_READER_UTILS_H_
+#define WEBP_UTILS_BIT_READER_UTILS_H_
 
 #include <assert.h>
 #ifdef _MSC_VER
@@ -155,9 +155,10 @@ static WEBP_INLINE int VP8LIsEndOfStream(const VP8LBitReader* const br) {
 
 // For jumping over a number of bits in the bit stream when accessed with
 // VP8LPrefetchBits and VP8LFillBitWindow.
+// This function does *not* set br->eos_, since it's speed-critical.
+// Use with extreme care!
 static WEBP_INLINE void VP8LSetBitPos(VP8LBitReader* const br, int val) {
   br->bit_pos_ = val;
-  br->eos_ = VP8LIsEndOfStream(br);
 }
 
 // Advances the read buffer by 4 bytes to make room for reading next 32 bits.
@@ -171,4 +172,4 @@ static WEBP_INLINE void VP8LFillBitWindow(VP8LBitReader* const br) {
 }    // extern "C"
 #endif
 
-#endif  /* WEBP_UTILS_BIT_READER_H_ */
+#endif  /* WEBP_UTILS_BIT_READER_UTILS_H_ */
diff --git a/media/libwebp/utils/bit_writer_utils.h b/media/libwebp/utils/bit_writer_utils.h
index 9c02bbc06d..9e9c2b729d 100644
--- a/media/libwebp/utils/bit_writer_utils.h
+++ b/media/libwebp/utils/bit_writer_utils.h
@@ -11,8 +11,8 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#ifndef WEBP_UTILS_BIT_WRITER_H_
-#define WEBP_UTILS_BIT_WRITER_H_
+#ifndef WEBP_UTILS_BIT_WRITER_UTILS_H_
+#define WEBP_UTILS_BIT_WRITER_UTILS_H_
 
 #include "../webp/types.h"
 
@@ -100,16 +100,24 @@ typedef struct {
   int error_;
 } VP8LBitWriter;
 
-static WEBP_INLINE size_t VP8LBitWriterNumBytes(VP8LBitWriter* const bw) {
+static WEBP_INLINE size_t VP8LBitWriterNumBytes(const VP8LBitWriter* const bw) {
   return (bw->cur_ - bw->buf_) + ((bw->used_ + 7) >> 3);
 }
 
 // Returns false in case of memory allocation error.
 int VP8LBitWriterInit(VP8LBitWriter* const bw, size_t expected_size);
+// Returns false in case of memory allocation error.
+int VP8LBitWriterClone(const VP8LBitWriter* const src,
+                       VP8LBitWriter* const dst);
 // Finalize the bitstream coding. Returns a pointer to the internal buffer.
 uint8_t* VP8LBitWriterFinish(VP8LBitWriter* const bw);
 // Release any pending memory and zeroes the object.
 void VP8LBitWriterWipeOut(VP8LBitWriter* const bw);
+// Resets the cursor of the BitWriter bw to when it was like in bw_init.
+void VP8LBitWriterReset(const VP8LBitWriter* const bw_init,
+                        VP8LBitWriter* const bw);
+// Swaps the memory held by two BitWriters.
+void VP8LBitWriterSwap(VP8LBitWriter* const src, VP8LBitWriter* const dst);
 
 // Internal function for VP8LPutBits flushing 32 bits from the written state.
 void VP8LPutBitsFlushBits(VP8LBitWriter* const bw);
@@ -143,4 +151,4 @@ static WEBP_INLINE void VP8LPutBits(VP8LBitWriter* const bw,
 }    // extern "C"
 #endif
 
-#endif  /* WEBP_UTILS_BIT_WRITER_H_ */
+#endif  /* WEBP_UTILS_BIT_WRITER_UTILS_H_ */
diff --git a/media/libwebp/utils/color_cache_utils.c b/media/libwebp/utils/color_cache_utils.c
index 0172590c48..c5eb0d8a90 100644
--- a/media/libwebp/utils/color_cache_utils.c
+++ b/media/libwebp/utils/color_cache_utils.c
@@ -14,8 +14,8 @@
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>
-#include "./color_cache_utils.h"
-#include "./utils.h"
+#include "../utils/color_cache_utils.h"
+#include "../utils/utils.h"
 
 //------------------------------------------------------------------------------
 // VP8LColorCache.
diff --git a/media/libwebp/utils/color_cache_utils.h b/media/libwebp/utils/color_cache_utils.h
index c373e6b361..c46131277d 100644
--- a/media/libwebp/utils/color_cache_utils.h
+++ b/media/libwebp/utils/color_cache_utils.h
@@ -12,8 +12,10 @@
 // Authors: Jyrki Alakuijala (jyrki@google.com)
 //          Urvang Joshi (urvang@google.com)
 
-#ifndef WEBP_UTILS_COLOR_CACHE_H_
-#define WEBP_UTILS_COLOR_CACHE_H_
+#ifndef WEBP_UTILS_COLOR_CACHE_UTILS_H_
+#define WEBP_UTILS_COLOR_CACHE_UTILS_H_
+
+#include <assert.h>
 
 #include "../webp/types.h"
 
@@ -30,7 +32,7 @@ typedef struct {
 
 static const uint64_t kHashMul = 0x1e35a7bdull;
 
-static WEBP_INLINE int HashPix(uint32_t argb, int shift) {
+static WEBP_INLINE int VP8LHashPix(uint32_t argb, int shift) {
   return (int)(((argb * kHashMul) & 0xffffffffu) >> shift);
 }
 
@@ -48,19 +50,19 @@ static WEBP_INLINE void VP8LColorCacheSet(const VP8LColorCache* const cc,
 
 static WEBP_INLINE void VP8LColorCacheInsert(const VP8LColorCache* const cc,
                                              uint32_t argb) {
-  const int key = HashPix(argb, cc->hash_shift_);
+  const int key = VP8LHashPix(argb, cc->hash_shift_);
   cc->colors_[key] = argb;
 }
 
 static WEBP_INLINE int VP8LColorCacheGetIndex(const VP8LColorCache* const cc,
                                               uint32_t argb) {
-  return HashPix(argb, cc->hash_shift_);
+  return VP8LHashPix(argb, cc->hash_shift_);
 }
 
 // Return the key if cc contains argb, and -1 otherwise.
 static WEBP_INLINE int VP8LColorCacheContains(const VP8LColorCache* const cc,
                                               uint32_t argb) {
-  const int key = HashPix(argb, cc->hash_shift_);
+  const int key = VP8LHashPix(argb, cc->hash_shift_);
   return (cc->colors_[key] == argb) ? key : -1;
 }
 
@@ -82,4 +84,4 @@ void VP8LColorCacheClear(VP8LColorCache* const color_cache);
 }
 #endif
 
-#endif  // WEBP_UTILS_COLOR_CACHE_H_
+#endif  // WEBP_UTILS_COLOR_CACHE_UTILS_H_
diff --git a/media/libwebp/utils/endian_inl_utils.h b/media/libwebp/utils/endian_inl_utils.h
index e11260ff7d..1c01450b95 100644
--- a/media/libwebp/utils/endian_inl_utils.h
+++ b/media/libwebp/utils/endian_inl_utils.h
@@ -9,8 +9,8 @@
 //
 // Endian related functions.
 
-#ifndef WEBP_UTILS_ENDIAN_INL_H_
-#define WEBP_UTILS_ENDIAN_INL_H_
+#ifndef WEBP_UTILS_ENDIAN_INL_UTILS_H_
+#define WEBP_UTILS_ENDIAN_INL_UTILS_H_
 
 #ifdef HAVE_CONFIG_H
 #include "../webp/config.h"
@@ -19,13 +19,6 @@
 #include "../dsp/dsp.h"
 #include "../webp/types.h"
 
-// some endian fix (e.g.: mips-gcc doesn't define __BIG_ENDIAN__)
-#if !defined(WORDS_BIGENDIAN) && \
-    (defined(__BIG_ENDIAN__) || defined(_M_PPC) || \
-     (defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)))
-#define WORDS_BIGENDIAN
-#endif
-
 #if defined(WORDS_BIGENDIAN)
 #define HToLE32 BSwap32
 #define HToLE16 BSwap16
@@ -97,4 +90,4 @@ static WEBP_INLINE uint64_t BSwap64(uint64_t x) {
 #endif  // HAVE_BUILTIN_BSWAP64
 }
 
-#endif  // WEBP_UTILS_ENDIAN_INL_H_
+#endif  // WEBP_UTILS_ENDIAN_INL_UTILS_H_
diff --git a/media/libwebp/utils/filters_utils.c b/media/libwebp/utils/filters_utils.c
index 49c1d18a22..b9c99b130e 100644
--- a/media/libwebp/utils/filters_utils.c
+++ b/media/libwebp/utils/filters_utils.c
@@ -11,7 +11,7 @@
 //
 // Author: Urvang (urvang@google.com)
 
-#include "./filters_utils.h"
+#include "../utils/filters_utils.h"
 #include <stdlib.h>
 #include <string.h>
 
diff --git a/media/libwebp/utils/filters_utils.h b/media/libwebp/utils/filters_utils.h
index 088b132fc5..9466030e57 100644
--- a/media/libwebp/utils/filters_utils.h
+++ b/media/libwebp/utils/filters_utils.h
@@ -11,8 +11,8 @@
 //
 // Author: Urvang (urvang@google.com)
 
-#ifndef WEBP_UTILS_FILTERS_H_
-#define WEBP_UTILS_FILTERS_H_
+#ifndef WEBP_UTILS_FILTERS_UTILS_H_
+#define WEBP_UTILS_FILTERS_UTILS_H_
 
 #include "../webp/types.h"
 #include "../dsp/dsp.h"
@@ -29,4 +29,4 @@ WEBP_FILTER_TYPE WebPEstimateBestFilter(const uint8_t* data,
 }    // extern "C"
 #endif
 
-#endif  /* WEBP_UTILS_FILTERS_H_ */
+#endif  /* WEBP_UTILS_FILTERS_UTILS_H_ */
diff --git a/media/libwebp/utils/huffman_encode_utils.h b/media/libwebp/utils/huffman_encode_utils.h
index a157165148..236f266e4d 100644
--- a/media/libwebp/utils/huffman_encode_utils.h
+++ b/media/libwebp/utils/huffman_encode_utils.h
@@ -11,8 +11,8 @@
 //
 // Entropy encoding (Huffman) for webp lossless
 
-#ifndef WEBP_UTILS_HUFFMAN_ENCODE_H_
-#define WEBP_UTILS_HUFFMAN_ENCODE_H_
+#ifndef WEBP_UTILS_HUFFMAN_ENCODE_UTILS_H_
+#define WEBP_UTILS_HUFFMAN_ENCODE_UTILS_H_
 
 #include "../webp/types.h"
 
@@ -57,4 +57,4 @@ void VP8LCreateHuffmanTree(uint32_t* const histogram, int tree_depth_limit,
 }
 #endif
 
-#endif  // WEBP_UTILS_HUFFMAN_ENCODE_H_
+#endif  // WEBP_UTILS_HUFFMAN_ENCODE_UTILS_H_
diff --git a/media/libwebp/utils/huffman_utils.c b/media/libwebp/utils/huffman_utils.c
index 008b5d746f..a2b4b3f897 100644
--- a/media/libwebp/utils/huffman_utils.c
+++ b/media/libwebp/utils/huffman_utils.c
@@ -14,8 +14,8 @@
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>
-#include "./huffman_utils.h"
-#include "./utils.h"
+#include "../utils/huffman_utils.h"
+#include "../utils/utils.h"
 #include "../webp/format_constants.h"
 
 // Huffman data read via DecodeImageStream is represented in two (red and green)
diff --git a/media/libwebp/utils/huffman_utils.h b/media/libwebp/utils/huffman_utils.h
index c6dd6aaa45..7f241aab97 100644
--- a/media/libwebp/utils/huffman_utils.h
+++ b/media/libwebp/utils/huffman_utils.h
@@ -11,8 +11,8 @@
 //
 // Author: Urvang Joshi (urvang@google.com)
 
-#ifndef WEBP_UTILS_HUFFMAN_H_
-#define WEBP_UTILS_HUFFMAN_H_
+#ifndef WEBP_UTILS_HUFFMAN_UTILS_H_
+#define WEBP_UTILS_HUFFMAN_UTILS_H_
 
 #include <assert.h>
 #include "../webp/format_constants.h"
@@ -85,4 +85,4 @@ int VP8LBuildHuffmanTable(HuffmanCode* const root_table, int root_bits,
 }    // extern "C"
 #endif
 
-#endif  // WEBP_UTILS_HUFFMAN_H_
+#endif  // WEBP_UTILS_HUFFMAN_UTILS_H_
diff --git a/media/libwebp/utils/quant_levels_dec_utils.c b/media/libwebp/utils/quant_levels_dec_utils.c
index d4d23d3147..5c498382d7 100644
--- a/media/libwebp/utils/quant_levels_dec_utils.c
+++ b/media/libwebp/utils/quant_levels_dec_utils.c
@@ -14,11 +14,11 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#include "./quant_levels_dec_utils.h"
+#include "../utils/quant_levels_dec_utils.h"
 
 #include <string.h>   // for memset
 
-#include "./utils.h"
+#include "../utils/utils.h"
 
 // #define USE_DITHERING   // uncomment to enable ordered dithering (not vital)
 
@@ -71,10 +71,11 @@ typedef struct {
 
 //------------------------------------------------------------------------------
 
-#define CLIP_MASK (int)(~0U << (8 + DFIX))
+#define CLIP_8b_MASK (int)(~0U << (8 + DFIX))
 static WEBP_INLINE uint8_t clip_8b(int v) {
-  return (!(v & CLIP_MASK)) ? (uint8_t)(v >> DFIX) : (v < 0) ? 0u : 255u;
+  return (!(v & CLIP_8b_MASK)) ? (uint8_t)(v >> DFIX) : (v < 0) ? 0u : 255u;
 }
+#undef CLIP_8b_MASK
 
 // vertical accumulation
 static void VFilter(SmoothParams* const p) {
diff --git a/media/libwebp/utils/quant_levels_dec_utils.h b/media/libwebp/utils/quant_levels_dec_utils.h
index 59a13495d3..4a59e06fe6 100644
--- a/media/libwebp/utils/quant_levels_dec_utils.h
+++ b/media/libwebp/utils/quant_levels_dec_utils.h
@@ -11,8 +11,8 @@
 //
 // Author:  Vikas Arora (vikasa@google.com)
 
-#ifndef WEBP_UTILS_QUANT_LEVELS_DEC_H_
-#define WEBP_UTILS_QUANT_LEVELS_DEC_H_
+#ifndef WEBP_UTILS_QUANT_LEVELS_DEC_UTILS_H_
+#define WEBP_UTILS_QUANT_LEVELS_DEC_UTILS_H_
 
 #include "../webp/types.h"
 
@@ -32,4 +32,4 @@ int WebPDequantizeLevels(uint8_t* const data, int width, int height, int stride,
 }    // extern "C"
 #endif
 
-#endif  /* WEBP_UTILS_QUANT_LEVELS_DEC_H_ */
+#endif  /* WEBP_UTILS_QUANT_LEVELS_DEC_UTILS_H_ */
diff --git a/media/libwebp/utils/quant_levels_utils.c b/media/libwebp/utils/quant_levels_utils.c
index 73174e8ab9..2757819270 100644
--- a/media/libwebp/utils/quant_levels_utils.c
+++ b/media/libwebp/utils/quant_levels_utils.c
@@ -14,7 +14,7 @@
 
 #include <assert.h>
 
-#include "./quant_levels_utils.h"
+#include "../utils/quant_levels_utils.h"
 
 #define NUM_SYMBOLS     256
 
diff --git a/media/libwebp/utils/quant_levels_utils.h b/media/libwebp/utils/quant_levels_utils.h
index 1cb5a32cae..837bd27306 100644
--- a/media/libwebp/utils/quant_levels_utils.h
+++ b/media/libwebp/utils/quant_levels_utils.h
@@ -11,8 +11,8 @@
 //
 // Author:  Vikas Arora (vikasa@google.com)
 
-#ifndef WEBP_UTILS_QUANT_LEVELS_H_
-#define WEBP_UTILS_QUANT_LEVELS_H_
+#ifndef WEBP_UTILS_QUANT_LEVELS_UTILS_H_
+#define WEBP_UTILS_QUANT_LEVELS_UTILS_H_
 
 #include <stdlib.h>
 
@@ -33,4 +33,4 @@ int QuantizeLevels(uint8_t* const data, int width, int height, int num_levels,
 }    // extern "C"
 #endif
 
-#endif  /* WEBP_UTILS_QUANT_LEVELS_H_ */
+#endif  /* WEBP_UTILS_QUANT_LEVELS_UTILS_H_ */
diff --git a/media/libwebp/utils/random_utils.c b/media/libwebp/utils/random_utils.c
index 9f1e4154a6..f2dd45a039 100644
--- a/media/libwebp/utils/random_utils.c
+++ b/media/libwebp/utils/random_utils.c
@@ -12,7 +12,7 @@
 // Author: Skal (pascal.massimino@gmail.com)
 
 #include <string.h>
-#include "./random_utils.h"
+#include "../utils/random_utils.h"
 
 //------------------------------------------------------------------------------
 
diff --git a/media/libwebp/utils/random_utils.h b/media/libwebp/utils/random_utils.h
index c392a615ca..7b58de8c96 100644
--- a/media/libwebp/utils/random_utils.h
+++ b/media/libwebp/utils/random_utils.h
@@ -11,8 +11,8 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#ifndef WEBP_UTILS_RANDOM_H_
-#define WEBP_UTILS_RANDOM_H_
+#ifndef WEBP_UTILS_RANDOM_UTILS_H_
+#define WEBP_UTILS_RANDOM_UTILS_H_
 
 #include <assert.h>
 #include "../webp/types.h"
@@ -60,4 +60,4 @@ static WEBP_INLINE int VP8RandomBits(VP8Random* const rg, int num_bits) {
 }    // extern "C"
 #endif
 
-#endif  /* WEBP_UTILS_RANDOM_H_ */
+#endif  /* WEBP_UTILS_RANDOM_UTILS_H_ */
diff --git a/media/libwebp/utils/rescaler_utils.c b/media/libwebp/utils/rescaler_utils.c
index 0d1f80da24..6e384f5078 100644
--- a/media/libwebp/utils/rescaler_utils.c
+++ b/media/libwebp/utils/rescaler_utils.c
@@ -15,7 +15,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include "../dsp/dsp.h"
-#include "./rescaler_utils.h"
+#include "../utils/rescaler_utils.h"
 
 //------------------------------------------------------------------------------
 
@@ -85,11 +85,13 @@ int WebPRescalerGetScaledDimensions(int src_width, int src_height,
 
     // if width is unspecified, scale original proportionally to height ratio.
     if (width == 0) {
-      width = (src_width * height + src_height / 2) / src_height;
+      width =
+          (int)(((uint64_t)src_width * height + src_height / 2) / src_height);
     }
     // if height is unspecified, scale original proportionally to width ratio.
     if (height == 0) {
-      height = (src_height * width + src_width / 2) / src_width;
+      height =
+          (int)(((uint64_t)src_height * width + src_width / 2) / src_width);
     }
     // Check if the overall dimensions still make sense.
     if (width <= 0 || height <= 0) {
diff --git a/media/libwebp/utils/rescaler_utils.h b/media/libwebp/utils/rescaler_utils.h
index 98b01a76d0..1c7b31d7fe 100644
--- a/media/libwebp/utils/rescaler_utils.h
+++ b/media/libwebp/utils/rescaler_utils.h
@@ -11,8 +11,8 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#ifndef WEBP_UTILS_RESCALER_H_
-#define WEBP_UTILS_RESCALER_H_
+#ifndef WEBP_UTILS_RESCALER_UTILS_H_
+#define WEBP_UTILS_RESCALER_UTILS_H_
 
 #ifdef __cplusplus
 extern "C" {
@@ -98,4 +98,4 @@ int WebPRescalerHasPendingOutput(const WebPRescaler* const rescaler) {
 }    // extern "C"
 #endif
 
-#endif  /* WEBP_UTILS_RESCALER_H_ */
+#endif  /* WEBP_UTILS_RESCALER_UTILS_H_ */
diff --git a/media/libwebp/utils/thread_utils.c b/media/libwebp/utils/thread_utils.c
index 1729060c70..e87ffbeac4 100644
--- a/media/libwebp/utils/thread_utils.c
+++ b/media/libwebp/utils/thread_utils.c
@@ -13,8 +13,8 @@
 
 #include <assert.h>
 #include <string.h>   // for memset()
-#include "./thread_utils.h"
-#include "./utils.h"
+#include "../utils/thread_utils.h"
+#include "../utils/utils.h"
 
 #ifdef WEBP_USE_THREAD
 
@@ -50,11 +50,11 @@ typedef struct {
 
 #endif  // _WIN32
 
-struct WebPWorkerImpl {
+typedef struct {
   pthread_mutex_t mutex_;
   pthread_cond_t  condition_;
   pthread_t       thread_;
-};
+} WebPWorkerImpl;
 
 #if defined(_WIN32)
 
@@ -201,25 +201,24 @@ static int pthread_cond_wait(pthread_cond_t* const condition,
 
 //------------------------------------------------------------------------------
 
-static void Execute(WebPWorker* const worker);  // Forward declaration.
-
 static THREADFN ThreadLoop(void* ptr) {
   WebPWorker* const worker = (WebPWorker*)ptr;
+  WebPWorkerImpl* const impl = (WebPWorkerImpl*)worker->impl_;
   int done = 0;
   while (!done) {
-    pthread_mutex_lock(&worker->impl_->mutex_);
+    pthread_mutex_lock(&impl->mutex_);
     while (worker->status_ == OK) {   // wait in idling mode
-      pthread_cond_wait(&worker->impl_->condition_, &worker->impl_->mutex_);
+      pthread_cond_wait(&impl->condition_, &impl->mutex_);
     }
     if (worker->status_ == WORK) {
-      Execute(worker);
+      WebPGetWorkerInterface()->Execute(worker);
       worker->status_ = OK;
     } else if (worker->status_ == NOT_OK) {   // finish the worker
       done = 1;
     }
     // signal to the main thread that we're done (for Sync())
-    pthread_cond_signal(&worker->impl_->condition_);
-    pthread_mutex_unlock(&worker->impl_->mutex_);
+    pthread_cond_signal(&impl->condition_);
+    pthread_mutex_unlock(&impl->mutex_);
   }
   return THREAD_RETURN(NULL);    // Thread is finished
 }
@@ -229,21 +228,22 @@ static void ChangeState(WebPWorker* const worker, WebPWorkerStatus new_status) {
   // No-op when attempting to change state on a thread that didn't come up.
   // Checking status_ without acquiring the lock first would result in a data
   // race.
-  if (worker->impl_ == NULL) return;
+  WebPWorkerImpl* const impl = (WebPWorkerImpl*)worker->impl_;
+  if (impl == NULL) return;
 
-  pthread_mutex_lock(&worker->impl_->mutex_);
+  pthread_mutex_lock(&impl->mutex_);
   if (worker->status_ >= OK) {
     // wait for the worker to finish
     while (worker->status_ != OK) {
-      pthread_cond_wait(&worker->impl_->condition_, &worker->impl_->mutex_);
+      pthread_cond_wait(&impl->condition_, &impl->mutex_);
     }
     // assign new status and release the working thread if needed
     if (new_status != OK) {
       worker->status_ = new_status;
-      pthread_cond_signal(&worker->impl_->condition_);
+      pthread_cond_signal(&impl->condition_);
     }
   }
-  pthread_mutex_unlock(&worker->impl_->mutex_);
+  pthread_mutex_unlock(&impl->mutex_);
 }
 
 #endif  // WEBP_USE_THREAD
@@ -268,26 +268,28 @@ static int Reset(WebPWorker* const worker) {
   worker->had_error = 0;
   if (worker->status_ < OK) {
 #ifdef WEBP_USE_THREAD
-    worker->impl_ = (WebPWorkerImpl*)WebPSafeCalloc(1, sizeof(*worker->impl_));
+    WebPWorkerImpl* const impl =
+        (WebPWorkerImpl*)WebPSafeCalloc(1, sizeof(WebPWorkerImpl));
+    worker->impl_ = (void*)impl;
     if (worker->impl_ == NULL) {
       return 0;
     }
-    if (pthread_mutex_init(&worker->impl_->mutex_, NULL)) {
+    if (pthread_mutex_init(&impl->mutex_, NULL)) {
       goto Error;
     }
-    if (pthread_cond_init(&worker->impl_->condition_, NULL)) {
-      pthread_mutex_destroy(&worker->impl_->mutex_);
+    if (pthread_cond_init(&impl->condition_, NULL)) {
+      pthread_mutex_destroy(&impl->mutex_);
       goto Error;
     }
-    pthread_mutex_lock(&worker->impl_->mutex_);
-    ok = !pthread_create(&worker->impl_->thread_, NULL, ThreadLoop, worker);
+    pthread_mutex_lock(&impl->mutex_);
+    ok = !pthread_create(&impl->thread_, NULL, ThreadLoop, worker);
     if (ok) worker->status_ = OK;
-    pthread_mutex_unlock(&worker->impl_->mutex_);
+    pthread_mutex_unlock(&impl->mutex_);
     if (!ok) {
-      pthread_mutex_destroy(&worker->impl_->mutex_);
-      pthread_cond_destroy(&worker->impl_->condition_);
+      pthread_mutex_destroy(&impl->mutex_);
+      pthread_cond_destroy(&impl->condition_);
  Error:
-      WebPSafeFree(worker->impl_);
+      WebPSafeFree(impl);
       worker->impl_ = NULL;
       return 0;
     }
@@ -318,11 +320,12 @@ static void Launch(WebPWorker* const worker) {
 static void End(WebPWorker* const worker) {
 #ifdef WEBP_USE_THREAD
   if (worker->impl_ != NULL) {
+    WebPWorkerImpl* const impl = (WebPWorkerImpl*)worker->impl_;
     ChangeState(worker, NOT_OK);
-    pthread_join(worker->impl_->thread_, NULL);
-    pthread_mutex_destroy(&worker->impl_->mutex_);
-    pthread_cond_destroy(&worker->impl_->condition_);
-    WebPSafeFree(worker->impl_);
+    pthread_join(impl->thread_, NULL);
+    pthread_mutex_destroy(&impl->mutex_);
+    pthread_cond_destroy(&impl->condition_);
+    WebPSafeFree(impl);
     worker->impl_ = NULL;
   }
 #else
diff --git a/media/libwebp/utils/thread_utils.h b/media/libwebp/utils/thread_utils.h
index 8408311855..0e88c2470e 100644
--- a/media/libwebp/utils/thread_utils.h
+++ b/media/libwebp/utils/thread_utils.h
@@ -11,8 +11,8 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#ifndef WEBP_UTILS_THREAD_H_
-#define WEBP_UTILS_THREAD_H_
+#ifndef WEBP_UTILS_THREAD_UTILS_H_
+#define WEBP_UTILS_THREAD_UTILS_H_
 
 #ifdef HAVE_CONFIG_H
 #include "../webp/config.h"
@@ -35,12 +35,9 @@ typedef enum {
 // arguments (data1 and data2), and should return false in case of error.
 typedef int (*WebPWorkerHook)(void*, void*);
 
-// Platform-dependent implementation details for the worker.
-typedef struct WebPWorkerImpl WebPWorkerImpl;
-
 // Synchronization object used to launch job in the worker thread
 typedef struct {
-  WebPWorkerImpl* impl_;
+  void* impl_;            // platform-dependent implementation worker details
   WebPWorkerStatus status_;
   WebPWorkerHook hook;    // hook to call
   void* data1;            // first argument passed to 'hook'
@@ -78,11 +75,11 @@ typedef struct {
 // decoding takes place. The contents of the interface struct are copied, it
 // is safe to free the corresponding memory after this call. This function is
 // not thread-safe. Return false in case of invalid pointer or methods.
-WEBP_EXTERN(int) WebPSetWorkerInterface(
+WEBP_EXTERN int WebPSetWorkerInterface(
     const WebPWorkerInterface* const winterface);
 
 // Retrieve the currently set thread worker interface.
-WEBP_EXTERN(const WebPWorkerInterface*) WebPGetWorkerInterface(void);
+WEBP_EXTERN const WebPWorkerInterface* WebPGetWorkerInterface(void);
 
 //------------------------------------------------------------------------------
 
@@ -90,4 +87,4 @@ WEBP_EXTERN(const WebPWorkerInterface*) WebPGetWorkerInterface(void);
 }    // extern "C"
 #endif
 
-#endif  /* WEBP_UTILS_THREAD_H_ */
+#endif  /* WEBP_UTILS_THREAD_UTILS_H_ */
diff --git a/media/libwebp/utils/utils.c b/media/libwebp/utils/utils.c
index 504d924b60..9bda6a7169 100644
--- a/media/libwebp/utils/utils.c
+++ b/media/libwebp/utils/utils.c
@@ -16,7 +16,8 @@
 #include "../webp/decode.h"
 #include "../webp/encode.h"
 #include "../webp/format_constants.h"  // for MAX_PALETTE_SIZE
-#include "./utils.h"
+#include "../utils/color_cache_utils.h"
+#include "../utils/utils.h"
 
 // If PRINT_MEM_INFO is defined, extra info (like total memory used, number of
 // alloc/free etc) is printed. For debugging/tuning purpose only (it's slow,
@@ -252,7 +253,6 @@ int WebPGetColorPalette(const WebPPicture* const pic, uint32_t* const palette) {
   int num_colors = 0;
   uint8_t in_use[COLOR_HASH_SIZE] = { 0 };
   uint32_t colors[COLOR_HASH_SIZE];
-  static const uint64_t kHashMul = 0x1e35a7bdull;
   const uint32_t* argb = pic->argb;
   const int width = pic->width;
   const int height = pic->height;
@@ -267,7 +267,7 @@ int WebPGetColorPalette(const WebPPicture* const pic, uint32_t* const palette) {
         continue;
       }
       last_pix = argb[x];
-      key = ((last_pix * kHashMul) & 0xffffffffu) >> COLOR_HASH_RIGHT_SHIFT;
+      key = VP8LHashPix(last_pix, COLOR_HASH_RIGHT_SHIFT);
       while (1) {
         if (!in_use[key]) {
           colors[key] = last_pix;
diff --git a/media/libwebp/utils/utils.h b/media/libwebp/utils/utils.h
index 3ab459050a..27dc7e090b 100644
--- a/media/libwebp/utils/utils.h
+++ b/media/libwebp/utils/utils.h
@@ -48,13 +48,13 @@ extern "C" {
 // somewhere (like: malloc(num_pixels * sizeof(*something))). That's why this
 // safe malloc() borrows the signature from calloc(), pointing at the dangerous
 // underlying multiply involved.
-WEBP_EXTERN(void*) WebPSafeMalloc(uint64_t nmemb, size_t size);
+WEBP_EXTERN void* WebPSafeMalloc(uint64_t nmemb, size_t size);
 // Note that WebPSafeCalloc() expects the second argument type to be 'size_t'
 // in order to favor the "calloc(num_foo, sizeof(foo))" pattern.
-WEBP_EXTERN(void*) WebPSafeCalloc(uint64_t nmemb, size_t size);
+WEBP_EXTERN void* WebPSafeCalloc(uint64_t nmemb, size_t size);
 
 // Companion deallocation function to the above allocations.
-WEBP_EXTERN(void) WebPSafeFree(void* const ptr);
+WEBP_EXTERN void WebPSafeFree(void* const ptr);
 
 //------------------------------------------------------------------------------
 // Alignment
@@ -66,7 +66,7 @@ WEBP_EXTERN(void) WebPSafeFree(void* const ptr);
 // memcpy() is the safe way of moving potentially unaligned 32b memory.
 static WEBP_INLINE uint32_t WebPMemToUint32(const uint8_t* const ptr) {
   uint32_t A;
-  memcpy(&A, (const int*)ptr, sizeof(A));
+  memcpy(&A, ptr, sizeof(A));
   return A;
 }
 static WEBP_INLINE void WebPUint32ToMem(uint8_t* const ptr, uint32_t val) {
@@ -112,12 +112,12 @@ static WEBP_INLINE void PutLE32(uint8_t* const data, uint32_t val) {
 #define WEBP_NEED_LOG_TABLE_8BIT
 extern const uint8_t WebPLogTable8bit[256];
 static WEBP_INLINE int WebPLog2FloorC(uint32_t n) {
-  int log = 0;
+  int log_value = 0;
   while (n >= 256) {
-    log += 8;
+    log_value += 8;
     n >>= 8;
   }
-  return log + WebPLogTable8bit[n];
+  return log_value + WebPLogTable8bit[n];
 }
 
 // Returns (int)floor(log2(n)). n must be > 0.
@@ -147,14 +147,14 @@ static WEBP_INLINE int BitsLog2Floor(uint32_t n) { return WebPLog2FloorC(n); }
 struct WebPPicture;
 
 // Copy width x height pixels from 'src' to 'dst' honoring the strides.
-WEBP_EXTERN(void) WebPCopyPlane(const uint8_t* src, int src_stride,
-                                uint8_t* dst, int dst_stride,
-                                int width, int height);
+WEBP_EXTERN void WebPCopyPlane(const uint8_t* src, int src_stride,
+                               uint8_t* dst, int dst_stride,
+                               int width, int height);
 
 // Copy ARGB pixels from 'src' to 'dst' honoring strides. 'src' and 'dst' are
 // assumed to be already allocated and using ARGB data.
-WEBP_EXTERN(void) WebPCopyPixels(const struct WebPPicture* const src,
-                                 struct WebPPicture* const dst);
+WEBP_EXTERN void WebPCopyPixels(const struct WebPPicture* const src,
+                                struct WebPPicture* const dst);
 
 //------------------------------------------------------------------------------
 // Unique colors.
@@ -166,8 +166,8 @@ WEBP_EXTERN(void) WebPCopyPixels(const struct WebPPicture* const src,
 // MAX_PALETTE_SIZE, also outputs the actual unique colors into 'palette'.
 // Note: 'palette' is assumed to be an array already allocated with at least
 // MAX_PALETTE_SIZE elements.
-WEBP_EXTERN(int) WebPGetColorPalette(const struct WebPPicture* const pic,
-                                     uint32_t* const palette);
+WEBP_EXTERN int WebPGetColorPalette(const struct WebPPicture* const pic,
+                                    uint32_t* const palette);
 
 //------------------------------------------------------------------------------
 
diff --git a/media/libwebp/webp/decode.h b/media/libwebp/webp/decode.h
index 4c5e74ac36..2165e96c95 100644
--- a/media/libwebp/webp/decode.h
+++ b/media/libwebp/webp/decode.h
@@ -36,39 +36,39 @@ typedef struct WebPDecoderConfig WebPDecoderConfig;
 
 // Return the decoder's version number, packed in hexadecimal using 8bits for
 // each of major/minor/revision. E.g: v2.5.7 is 0x020507.
-WEBP_EXTERN(int) WebPGetDecoderVersion(void);
+WEBP_EXTERN int WebPGetDecoderVersion(void);
 
 // Retrieve basic header information: width, height.
 // This function will also validate the header, returning true on success,
 // false otherwise. '*width' and '*height' are only valid on successful return.
 // Pointers 'width' and 'height' can be passed NULL if deemed irrelevant.
-WEBP_EXTERN(int) WebPGetInfo(const uint8_t* data, size_t data_size,
-                             int* width, int* height);
+WEBP_EXTERN int WebPGetInfo(const uint8_t* data, size_t data_size,
+                            int* width, int* height);
 
 // Decodes WebP images pointed to by 'data' and returns RGBA samples, along
 // with the dimensions in *width and *height. The ordering of samples in
 // memory is R, G, B, A, R, G, B, A... in scan order (endian-independent).
 // The returned pointer should be deleted calling WebPFree().
 // Returns NULL in case of error.
-WEBP_EXTERN(uint8_t*) WebPDecodeRGBA(const uint8_t* data, size_t data_size,
-                                     int* width, int* height);
+WEBP_EXTERN uint8_t* WebPDecodeRGBA(const uint8_t* data, size_t data_size,
+                                    int* width, int* height);
 
 // Same as WebPDecodeRGBA, but returning A, R, G, B, A, R, G, B... ordered data.
-WEBP_EXTERN(uint8_t*) WebPDecodeARGB(const uint8_t* data, size_t data_size,
-                                     int* width, int* height);
+WEBP_EXTERN uint8_t* WebPDecodeARGB(const uint8_t* data, size_t data_size,
+                                    int* width, int* height);
 
 // Same as WebPDecodeRGBA, but returning B, G, R, A, B, G, R, A... ordered data.
-WEBP_EXTERN(uint8_t*) WebPDecodeBGRA(const uint8_t* data, size_t data_size,
-                                     int* width, int* height);
+WEBP_EXTERN uint8_t* WebPDecodeBGRA(const uint8_t* data, size_t data_size,
+                                    int* width, int* height);
 
 // Same as WebPDecodeRGBA, but returning R, G, B, R, G, B... ordered data.
 // If the bitstream contains transparency, it is ignored.
-WEBP_EXTERN(uint8_t*) WebPDecodeRGB(const uint8_t* data, size_t data_size,
-                                    int* width, int* height);
+WEBP_EXTERN uint8_t* WebPDecodeRGB(const uint8_t* data, size_t data_size,
+                                   int* width, int* height);
 
 // Same as WebPDecodeRGB, but returning B, G, R, B, G, R... ordered data.
-WEBP_EXTERN(uint8_t*) WebPDecodeBGR(const uint8_t* data, size_t data_size,
-                                    int* width, int* height);
+WEBP_EXTERN uint8_t* WebPDecodeBGR(const uint8_t* data, size_t data_size,
+                                   int* width, int* height);
 
 
 // Decode WebP images pointed to by 'data' to Y'UV format(*). The pointer
@@ -80,13 +80,13 @@ WEBP_EXTERN(uint8_t*) WebPDecodeBGR(const uint8_t* data, size_t data_size,
 // have a common stride returned as '*uv_stride'.
 // Return NULL in case of error.
 // (*) Also named Y'CbCr. See: http://en.wikipedia.org/wiki/YCbCr
-WEBP_EXTERN(uint8_t*) WebPDecodeYUV(const uint8_t* data, size_t data_size,
-                                    int* width, int* height,
-                                    uint8_t** u, uint8_t** v,
-                                    int* stride, int* uv_stride);
+WEBP_EXTERN uint8_t* WebPDecodeYUV(const uint8_t* data, size_t data_size,
+                                   int* width, int* height,
+                                   uint8_t** u, uint8_t** v,
+                                   int* stride, int* uv_stride);
 
 // Releases memory returned by the WebPDecode*() functions above.
-WEBP_EXTERN(void) WebPFree(void* ptr);
+WEBP_EXTERN void WebPFree(void* ptr);
 
 // These five functions are variants of the above ones, that decode the image
 // directly into a pre-allocated buffer 'output_buffer'. The maximum storage
@@ -96,22 +96,22 @@ WEBP_EXTERN(void) WebPFree(void* ptr);
 // The parameter 'output_stride' specifies the distance (in bytes)
 // between scanlines. Hence, output_buffer_size is expected to be at least
 // output_stride x picture-height.
-WEBP_EXTERN(uint8_t*) WebPDecodeRGBAInto(
+WEBP_EXTERN uint8_t* WebPDecodeRGBAInto(
     const uint8_t* data, size_t data_size,
     uint8_t* output_buffer, size_t output_buffer_size, int output_stride);
-WEBP_EXTERN(uint8_t*) WebPDecodeARGBInto(
+WEBP_EXTERN uint8_t* WebPDecodeARGBInto(
     const uint8_t* data, size_t data_size,
     uint8_t* output_buffer, size_t output_buffer_size, int output_stride);
-WEBP_EXTERN(uint8_t*) WebPDecodeBGRAInto(
+WEBP_EXTERN uint8_t* WebPDecodeBGRAInto(
     const uint8_t* data, size_t data_size,
     uint8_t* output_buffer, size_t output_buffer_size, int output_stride);
 
 // RGB and BGR variants. Here too the transparency information, if present,
 // will be dropped and ignored.
-WEBP_EXTERN(uint8_t*) WebPDecodeRGBInto(
+WEBP_EXTERN uint8_t* WebPDecodeRGBInto(
     const uint8_t* data, size_t data_size,
     uint8_t* output_buffer, size_t output_buffer_size, int output_stride);
-WEBP_EXTERN(uint8_t*) WebPDecodeBGRInto(
+WEBP_EXTERN uint8_t* WebPDecodeBGRInto(
     const uint8_t* data, size_t data_size,
     uint8_t* output_buffer, size_t output_buffer_size, int output_stride);
 
@@ -122,7 +122,7 @@ WEBP_EXTERN(uint8_t*) WebPDecodeBGRInto(
 // 'u_size' and 'v_size' respectively.
 // Pointer to the luma plane ('*luma') is returned or NULL if an error occurred
 // during decoding (or because some buffers were found to be too small).
-WEBP_EXTERN(uint8_t*) WebPDecodeYUVInto(
+WEBP_EXTERN uint8_t* WebPDecodeYUVInto(
     const uint8_t* data, size_t data_size,
     uint8_t* luma, size_t luma_size, int luma_stride,
     uint8_t* u, size_t u_size, int u_stride,
@@ -213,7 +213,7 @@ struct WebPDecBuffer {
 };
 
 // Internal, version-checked, entry point
-WEBP_EXTERN(int) WebPInitDecBufferInternal(WebPDecBuffer*, int);
+WEBP_EXTERN int WebPInitDecBufferInternal(WebPDecBuffer*, int);
 
 // Initialize the structure as empty. Must be called before any other use.
 // Returns false in case of version mismatch
@@ -223,7 +223,7 @@ static WEBP_INLINE int WebPInitDecBuffer(WebPDecBuffer* buffer) {
 
 // Free any memory associated with the buffer. Must always be called last.
 // Note: doesn't free the 'buffer' structure itself.
-WEBP_EXTERN(void) WebPFreeDecBuffer(WebPDecBuffer* buffer);
+WEBP_EXTERN void WebPFreeDecBuffer(WebPDecBuffer* buffer);
 
 //------------------------------------------------------------------------------
 // Enumeration of the status codes
@@ -277,7 +277,7 @@ typedef enum VP8StatusCode {
 // within valid bounds.
 // All other fields of WebPDecBuffer MUST remain constant between calls.
 // Returns NULL if the allocation failed.
-WEBP_EXTERN(WebPIDecoder*) WebPINewDecoder(WebPDecBuffer* output_buffer);
+WEBP_EXTERN WebPIDecoder* WebPINewDecoder(WebPDecBuffer* output_buffer);
 
 // This function allocates and initializes an incremental-decoder object, which
 // will output the RGB/A samples specified by 'csp' into a preallocated
@@ -289,7 +289,7 @@ WEBP_EXTERN(WebPIDecoder*) WebPINewDecoder(WebPDecBuffer* output_buffer);
 // colorspace 'csp' is taken into account for allocating this buffer. All other
 // parameters are ignored.
 // Returns NULL if the allocation failed, or if some parameters are invalid.
-WEBP_EXTERN(WebPIDecoder*) WebPINewRGB(
+WEBP_EXTERN WebPIDecoder* WebPINewRGB(
     WEBP_CSP_MODE csp,
     uint8_t* output_buffer, size_t output_buffer_size, int output_stride);
 
@@ -304,7 +304,7 @@ WEBP_EXTERN(WebPIDecoder*) WebPINewRGB(
 // In this case, the output buffer will be automatically allocated (using
 // MODE_YUVA) when decoding starts. All parameters are then ignored.
 // Returns NULL if the allocation failed or if a parameter is invalid.
-WEBP_EXTERN(WebPIDecoder*) WebPINewYUVA(
+WEBP_EXTERN WebPIDecoder* WebPINewYUVA(
     uint8_t* luma, size_t luma_size, int luma_stride,
     uint8_t* u, size_t u_size, int u_stride,
     uint8_t* v, size_t v_size, int v_stride,
@@ -312,19 +312,19 @@ WEBP_EXTERN(WebPIDecoder*) WebPINewYUVA(
 
 // Deprecated version of the above, without the alpha plane.
 // Kept for backward compatibility.
-WEBP_EXTERN(WebPIDecoder*) WebPINewYUV(
+WEBP_EXTERN WebPIDecoder* WebPINewYUV(
     uint8_t* luma, size_t luma_size, int luma_stride,
     uint8_t* u, size_t u_size, int u_stride,
     uint8_t* v, size_t v_size, int v_stride);
 
 // Deletes the WebPIDecoder object and associated memory. Must always be called
 // if WebPINewDecoder, WebPINewRGB or WebPINewYUV succeeded.
-WEBP_EXTERN(void) WebPIDelete(WebPIDecoder* idec);
+WEBP_EXTERN void WebPIDelete(WebPIDecoder* idec);
 
 // Copies and decodes the next available data. Returns VP8_STATUS_OK when
 // the image is successfully decoded. Returns VP8_STATUS_SUSPENDED when more
 // data is expected. Returns error in other cases.
-WEBP_EXTERN(VP8StatusCode) WebPIAppend(
+WEBP_EXTERN VP8StatusCode WebPIAppend(
     WebPIDecoder* idec, const uint8_t* data, size_t data_size);
 
 // A variant of the above function to be used when data buffer contains
@@ -332,7 +332,7 @@ WEBP_EXTERN(VP8StatusCode) WebPIAppend(
 // to the internal memory.
 // Note that the value of the 'data' pointer can change between calls to
 // WebPIUpdate, for instance when the data buffer is resized to fit larger data.
-WEBP_EXTERN(VP8StatusCode) WebPIUpdate(
+WEBP_EXTERN VP8StatusCode WebPIUpdate(
     WebPIDecoder* idec, const uint8_t* data, size_t data_size);
 
 // Returns the RGB/A image decoded so far. Returns NULL if output params
@@ -340,15 +340,16 @@ WEBP_EXTERN(VP8StatusCode) WebPIUpdate(
 // specified during call to WebPINewDecoder() or WebPINewRGB().
 // *last_y is the index of last decoded row in raster scan order. Some pointers
 // (*last_y, *width etc.) can be NULL if corresponding information is not
-// needed.
-WEBP_EXTERN(uint8_t*) WebPIDecGetRGB(
+// needed. The values in these pointers are only valid on successful (non-NULL)
+// return.
+WEBP_EXTERN uint8_t* WebPIDecGetRGB(
     const WebPIDecoder* idec, int* last_y,
     int* width, int* height, int* stride);
 
 // Same as above function to get a YUVA image. Returns pointer to the luma
 // plane or NULL in case of error. If there is no alpha information
 // the alpha pointer '*a' will be returned NULL.
-WEBP_EXTERN(uint8_t*) WebPIDecGetYUVA(
+WEBP_EXTERN uint8_t* WebPIDecGetYUVA(
     const WebPIDecoder* idec, int* last_y,
     uint8_t** u, uint8_t** v, uint8_t** a,
     int* width, int* height, int* stride, int* uv_stride, int* a_stride);
@@ -368,7 +369,7 @@ static WEBP_INLINE uint8_t* WebPIDecGetYUV(
 // Returns NULL in case the incremental decoder object is in an invalid state.
 // Otherwise returns the pointer to the internal representation. This structure
 // is read-only, tied to WebPIDecoder's lifespan and should not be modified.
-WEBP_EXTERN(const WebPDecBuffer*) WebPIDecodedArea(
+WEBP_EXTERN const WebPDecBuffer* WebPIDecodedArea(
     const WebPIDecoder* idec, int* left, int* top, int* width, int* height);
 
 //------------------------------------------------------------------------------
@@ -416,7 +417,7 @@ struct WebPBitstreamFeatures {
 };
 
 // Internal, version-checked, entry point
-WEBP_EXTERN(VP8StatusCode) WebPGetFeaturesInternal(
+WEBP_EXTERN VP8StatusCode WebPGetFeaturesInternal(
     const uint8_t*, size_t, WebPBitstreamFeatures*, int);
 
 // Retrieve features from the bitstream. The *features structure is filled
@@ -457,7 +458,7 @@ struct WebPDecoderConfig {
 };
 
 // Internal, version-checked, entry point
-WEBP_EXTERN(int) WebPInitDecoderConfigInternal(WebPDecoderConfig*, int);
+WEBP_EXTERN int WebPInitDecoderConfigInternal(WebPDecoderConfig*, int);
 
 // Initialize the configuration as empty. This function must always be
 // called first, unless WebPGetFeatures() is to be called.
@@ -477,14 +478,14 @@ static WEBP_INLINE int WebPInitDecoderConfig(WebPDecoderConfig* config) {
 // The return WebPIDecoder object must always be deleted calling WebPIDelete().
 // Returns NULL in case of error (and config->status will then reflect
 // the error condition, if available).
-WEBP_EXTERN(WebPIDecoder*) WebPIDecode(const uint8_t* data, size_t data_size,
-                                       WebPDecoderConfig* config);
+WEBP_EXTERN WebPIDecoder* WebPIDecode(const uint8_t* data, size_t data_size,
+                                      WebPDecoderConfig* config);
 
 // Non-incremental version. This version decodes the full data at once, taking
 // 'config' into account. Returns decoding status (which should be VP8_STATUS_OK
 // if the decoding was successful). Note that 'config' cannot be NULL.
-WEBP_EXTERN(VP8StatusCode) WebPDecode(const uint8_t* data, size_t data_size,
-                                      WebPDecoderConfig* config);
+WEBP_EXTERN VP8StatusCode WebPDecode(const uint8_t* data, size_t data_size,
+                                     WebPDecoderConfig* config);
 
 #ifdef __cplusplus
 }    // extern "C"
diff --git a/media/libwebp/webp/demux.h b/media/libwebp/webp/demux.h
index 454f6914b2..555d641338 100644
--- a/media/libwebp/webp/demux.h
+++ b/media/libwebp/webp/demux.h
@@ -71,7 +71,7 @@ typedef struct WebPAnimDecoderOptions WebPAnimDecoderOptions;
 
 // Returns the version number of the demux library, packed in hexadecimal using
 // 8bits for each of major/minor/revision. E.g: v2.5.7 is 0x020507.
-WEBP_EXTERN(int) WebPGetDemuxVersion(void);
+WEBP_EXTERN int WebPGetDemuxVersion(void);
 
 //------------------------------------------------------------------------------
 // Life of a Demux object
@@ -85,7 +85,7 @@ typedef enum WebPDemuxState {
 } WebPDemuxState;
 
 // Internal, version-checked, entry point
-WEBP_EXTERN(WebPDemuxer*) WebPDemuxInternal(
+WEBP_EXTERN WebPDemuxer* WebPDemuxInternal(
     const WebPData*, int, WebPDemuxState*, int);
 
 // Parses the full WebP file given by 'data'. For single images the WebP file
@@ -109,27 +109,32 @@ static WEBP_INLINE WebPDemuxer* WebPDemuxPartial(
 }
 
 // Frees memory associated with 'dmux'.
-WEBP_EXTERN(void) WebPDemuxDelete(WebPDemuxer* dmux);
+WEBP_EXTERN void WebPDemuxDelete(WebPDemuxer* dmux);
 
 //------------------------------------------------------------------------------
 // Data/information extraction.
 
 typedef enum WebPFormatFeature {
-  WEBP_FF_FORMAT_FLAGS,  // Extended format flags present in the 'VP8X' chunk.
+  WEBP_FF_FORMAT_FLAGS,      // bit-wise combination of WebPFeatureFlags
+                             // corresponding to the 'VP8X' chunk (if present).
   WEBP_FF_CANVAS_WIDTH,
   WEBP_FF_CANVAS_HEIGHT,
-  WEBP_FF_LOOP_COUNT,
-  WEBP_FF_BACKGROUND_COLOR,
-  WEBP_FF_FRAME_COUNT    // Number of frames present in the demux object.
-                         // In case of a partial demux, this is the number of
-                         // frames seen so far, with the last frame possibly
-                         // being partial.
+  WEBP_FF_LOOP_COUNT,        // only relevant for animated file
+  WEBP_FF_BACKGROUND_COLOR,  // idem.
+  WEBP_FF_FRAME_COUNT        // Number of frames present in the demux object.
+                             // In case of a partial demux, this is the number
+                             // of frames seen so far, with the last frame
+                             // possibly being partial.
 } WebPFormatFeature;
 
 // Get the 'feature' value from the 'dmux'.
 // NOTE: values are only valid if WebPDemux() was used or WebPDemuxPartial()
 // returned a state > WEBP_DEMUX_PARSING_HEADER.
-WEBP_EXTERN(uint32_t) WebPDemuxGetI(
+// If 'feature' is WEBP_FF_FORMAT_FLAGS, the returned value is a bit-wise
+// combination of WebPFeatureFlags values.
+// If 'feature' is WEBP_FF_LOOP_COUNT, WEBP_FF_BACKGROUND_COLOR, the returned
+// value is only meaningful if the bitstream is animated.
+WEBP_EXTERN uint32_t WebPDemuxGetI(
     const WebPDemuxer* dmux, WebPFormatFeature feature);
 
 //------------------------------------------------------------------------------
@@ -159,20 +164,20 @@ struct WebPIterator {
 // Returns false if 'dmux' is NULL or frame 'frame_number' is not present.
 // Call WebPDemuxReleaseIterator() when use of the iterator is complete.
 // NOTE: 'dmux' must persist for the lifetime of 'iter'.
-WEBP_EXTERN(int) WebPDemuxGetFrame(
+WEBP_EXTERN int WebPDemuxGetFrame(
     const WebPDemuxer* dmux, int frame_number, WebPIterator* iter);
 
 // Sets 'iter->fragment' to point to the next ('iter->frame_num' + 1) or
 // previous ('iter->frame_num' - 1) frame. These functions do not loop.
 // Returns true on success, false otherwise.
-WEBP_EXTERN(int) WebPDemuxNextFrame(WebPIterator* iter);
-WEBP_EXTERN(int) WebPDemuxPrevFrame(WebPIterator* iter);
+WEBP_EXTERN int WebPDemuxNextFrame(WebPIterator* iter);
+WEBP_EXTERN int WebPDemuxPrevFrame(WebPIterator* iter);
 
 // Releases any memory associated with 'iter'.
 // Must be called before any subsequent calls to WebPDemuxGetChunk() on the same
 // iter. Also, must be called before destroying the associated WebPDemuxer with
 // WebPDemuxDelete().
-WEBP_EXTERN(void) WebPDemuxReleaseIterator(WebPIterator* iter);
+WEBP_EXTERN void WebPDemuxReleaseIterator(WebPIterator* iter);
 
 //------------------------------------------------------------------------------
 // Chunk iteration.
@@ -197,20 +202,20 @@ struct WebPChunkIterator {
 // payloads are accessed through WebPDemuxGetFrame() and related functions.
 // Call WebPDemuxReleaseChunkIterator() when use of the iterator is complete.
 // NOTE: 'dmux' must persist for the lifetime of the iterator.
-WEBP_EXTERN(int) WebPDemuxGetChunk(const WebPDemuxer* dmux,
-                                   const char fourcc[4], int chunk_number,
-                                   WebPChunkIterator* iter);
+WEBP_EXTERN int WebPDemuxGetChunk(const WebPDemuxer* dmux,
+                                  const char fourcc[4], int chunk_number,
+                                  WebPChunkIterator* iter);
 
 // Sets 'iter->chunk' to point to the next ('iter->chunk_num' + 1) or previous
 // ('iter->chunk_num' - 1) chunk. These functions do not loop.
 // Returns true on success, false otherwise.
-WEBP_EXTERN(int) WebPDemuxNextChunk(WebPChunkIterator* iter);
-WEBP_EXTERN(int) WebPDemuxPrevChunk(WebPChunkIterator* iter);
+WEBP_EXTERN int WebPDemuxNextChunk(WebPChunkIterator* iter);
+WEBP_EXTERN int WebPDemuxPrevChunk(WebPChunkIterator* iter);
 
 // Releases any memory associated with 'iter'.
 // Must be called before destroying the associated WebPDemuxer with
 // WebPDemuxDelete().
-WEBP_EXTERN(void) WebPDemuxReleaseChunkIterator(WebPChunkIterator* iter);
+WEBP_EXTERN void WebPDemuxReleaseChunkIterator(WebPChunkIterator* iter);
 
 //------------------------------------------------------------------------------
 // WebPAnimDecoder API
@@ -252,7 +257,7 @@ struct WebPAnimDecoderOptions {
 };
 
 // Internal, version-checked, entry point.
-WEBP_EXTERN(int) WebPAnimDecoderOptionsInitInternal(
+WEBP_EXTERN int WebPAnimDecoderOptionsInitInternal(
     WebPAnimDecoderOptions*, int);
 
 // Should always be called, to initialize a fresh WebPAnimDecoderOptions
@@ -266,7 +271,7 @@ static WEBP_INLINE int WebPAnimDecoderOptionsInit(
 }
 
 // Internal, version-checked, entry point.
-WEBP_EXTERN(WebPAnimDecoder*) WebPAnimDecoderNewInternal(
+WEBP_EXTERN WebPAnimDecoder* WebPAnimDecoderNewInternal(
     const WebPData*, const WebPAnimDecoderOptions*, int);
 
 // Creates and initializes a WebPAnimDecoder object.
@@ -301,8 +306,8 @@ struct WebPAnimInfo {
 //   info - (out) global information fetched from the animation.
 // Returns:
 //   True on success.
-WEBP_EXTERN(int) WebPAnimDecoderGetInfo(const WebPAnimDecoder* dec,
-                                        WebPAnimInfo* info);
+WEBP_EXTERN int WebPAnimDecoderGetInfo(const WebPAnimDecoder* dec,
+                                       WebPAnimInfo* info);
 
 // Fetch the next frame from 'dec' based on options supplied to
 // WebPAnimDecoderNew(). This will be a fully reconstructed canvas of size
@@ -316,8 +321,8 @@ WEBP_EXTERN(int) WebPAnimDecoderGetInfo(const WebPAnimDecoder* dec,
 // Returns:
 //   False if any of the arguments are NULL, or if there is a parsing or
 //   decoding error, or if there are no more frames. Otherwise, returns true.
-WEBP_EXTERN(int) WebPAnimDecoderGetNext(WebPAnimDecoder* dec,
-                                        uint8_t** buf, int* timestamp);
+WEBP_EXTERN int WebPAnimDecoderGetNext(WebPAnimDecoder* dec,
+                                       uint8_t** buf, int* timestamp);
 
 // Check if there are more frames left to decode.
 // Parameters:
@@ -325,7 +330,7 @@ WEBP_EXTERN(int) WebPAnimDecoderGetNext(WebPAnimDecoder* dec,
 // Returns:
 //   True if 'dec' is not NULL and some frames are yet to be decoded.
 //   Otherwise, returns false.
-WEBP_EXTERN(int) WebPAnimDecoderHasMoreFrames(const WebPAnimDecoder* dec);
+WEBP_EXTERN int WebPAnimDecoderHasMoreFrames(const WebPAnimDecoder* dec);
 
 // Resets the WebPAnimDecoder object, so that next call to
 // WebPAnimDecoderGetNext() will restart decoding from 1st frame. This would be
@@ -333,7 +338,7 @@ WEBP_EXTERN(int) WebPAnimDecoderHasMoreFrames(const WebPAnimDecoder* dec);
 // info.loop_count times) without destroying and recreating the 'dec' object.
 // Parameters:
 //   dec - (in/out) decoder instance to be reset
-WEBP_EXTERN(void) WebPAnimDecoderReset(WebPAnimDecoder* dec);
+WEBP_EXTERN void WebPAnimDecoderReset(WebPAnimDecoder* dec);
 
 // Grab the internal demuxer object.
 // Getting the demuxer object can be useful if one wants to use operations only
@@ -343,13 +348,13 @@ WEBP_EXTERN(void) WebPAnimDecoderReset(WebPAnimDecoder* dec);
 //
 // Parameters:
 //   dec - (in) decoder instance from which the demuxer object is to be fetched.
-WEBP_EXTERN(const WebPDemuxer*) WebPAnimDecoderGetDemuxer(
+WEBP_EXTERN const WebPDemuxer* WebPAnimDecoderGetDemuxer(
     const WebPAnimDecoder* dec);
 
 // Deletes the WebPAnimDecoder object.
 // Parameters:
 //   dec - (in/out) decoder instance to be deleted
-WEBP_EXTERN(void) WebPAnimDecoderDelete(WebPAnimDecoder* dec);
+WEBP_EXTERN void WebPAnimDecoderDelete(WebPAnimDecoder* dec);
 
 #ifdef __cplusplus
 }    // extern "C"
diff --git a/media/libwebp/webp/encode.h b/media/libwebp/webp/encode.h
index 35fde1d052..7ec3543dc2 100644
--- a/media/libwebp/webp/encode.h
+++ b/media/libwebp/webp/encode.h
@@ -35,7 +35,7 @@ typedef struct WebPMemoryWriter WebPMemoryWriter;
 
 // Return the encoder's version number, packed in hexadecimal using 8bits for
 // each of major/minor/revision. E.g: v2.5.7 is 0x020507.
-WEBP_EXTERN(int) WebPGetEncoderVersion(void);
+WEBP_EXTERN int WebPGetEncoderVersion(void);
 
 //------------------------------------------------------------------------------
 // One-stop-shop call! No questions asked:
@@ -46,37 +46,37 @@ WEBP_EXTERN(int) WebPGetEncoderVersion(void);
 // These functions compress using the lossy format, and the quality_factor
 // can go from 0 (smaller output, lower quality) to 100 (best quality,
 // larger output).
-WEBP_EXTERN(size_t) WebPEncodeRGB(const uint8_t* rgb,
+WEBP_EXTERN size_t WebPEncodeRGB(const uint8_t* rgb,
+                                 int width, int height, int stride,
+                                 float quality_factor, uint8_t** output);
+WEBP_EXTERN size_t WebPEncodeBGR(const uint8_t* bgr,
+                                 int width, int height, int stride,
+                                 float quality_factor, uint8_t** output);
+WEBP_EXTERN size_t WebPEncodeRGBA(const uint8_t* rgba,
                                   int width, int height, int stride,
                                   float quality_factor, uint8_t** output);
-WEBP_EXTERN(size_t) WebPEncodeBGR(const uint8_t* bgr,
+WEBP_EXTERN size_t WebPEncodeBGRA(const uint8_t* bgra,
                                   int width, int height, int stride,
                                   float quality_factor, uint8_t** output);
-WEBP_EXTERN(size_t) WebPEncodeRGBA(const uint8_t* rgba,
-                                   int width, int height, int stride,
-                                   float quality_factor, uint8_t** output);
-WEBP_EXTERN(size_t) WebPEncodeBGRA(const uint8_t* bgra,
-                                   int width, int height, int stride,
-                                   float quality_factor, uint8_t** output);
 
 // These functions are the equivalent of the above, but compressing in a
 // lossless manner. Files are usually larger than lossy format, but will
 // not suffer any compression loss.
-WEBP_EXTERN(size_t) WebPEncodeLosslessRGB(const uint8_t* rgb,
+WEBP_EXTERN size_t WebPEncodeLosslessRGB(const uint8_t* rgb,
+                                         int width, int height, int stride,
+                                         uint8_t** output);
+WEBP_EXTERN size_t WebPEncodeLosslessBGR(const uint8_t* bgr,
+                                         int width, int height, int stride,
+                                         uint8_t** output);
+WEBP_EXTERN size_t WebPEncodeLosslessRGBA(const uint8_t* rgba,
                                           int width, int height, int stride,
                                           uint8_t** output);
-WEBP_EXTERN(size_t) WebPEncodeLosslessBGR(const uint8_t* bgr,
+WEBP_EXTERN size_t WebPEncodeLosslessBGRA(const uint8_t* bgra,
                                           int width, int height, int stride,
                                           uint8_t** output);
-WEBP_EXTERN(size_t) WebPEncodeLosslessRGBA(const uint8_t* rgba,
-                                           int width, int height, int stride,
-                                           uint8_t** output);
-WEBP_EXTERN(size_t) WebPEncodeLosslessBGRA(const uint8_t* bgra,
-                                           int width, int height, int stride,
-                                           uint8_t** output);
 
 // Releases memory returned by the WebPEncode*() functions above.
-WEBP_EXTERN(void) WebPFree(void* ptr);
+WEBP_EXTERN void WebPFree(void* ptr);
 
 //------------------------------------------------------------------------------
 // Coding parameters
@@ -93,12 +93,15 @@ typedef enum WebPImageHint {
 // Compression parameters.
 struct WebPConfig {
   int lossless;           // Lossless encoding (0=lossy(default), 1=lossless).
-  float quality;          // between 0 (smallest file) and 100 (biggest)
+  float quality;          // between 0 and 100. For lossy, 0 gives the smallest
+                          // size and 100 the largest. For lossless, this
+                          // parameter is the amount of effort put into the
+                          // compression: 0 is the fastest but gives larger
+                          // files compared to the slowest, but best, 100.
   int method;             // quality/speed trade-off (0=fast, 6=slower-better)
 
   WebPImageHint image_hint;  // Hint for image type (lossless only for now).
 
-  // Parameters related to lossy compression only:
   int target_size;        // if non-zero, set the desired target size in bytes.
                           // Takes precedence over the 'compression' parameter.
   float target_PSNR;      // if non-zero, specifies the minimal distortion to
@@ -159,7 +162,7 @@ typedef enum WebPPreset {
 } WebPPreset;
 
 // Internal, version-checked, entry point
-WEBP_EXTERN(int) WebPConfigInitInternal(WebPConfig*, WebPPreset, float, int);
+WEBP_EXTERN int WebPConfigInitInternal(WebPConfig*, WebPPreset, float, int);
 
 // Should always be called, to initialize a fresh WebPConfig structure before
 // modification. Returns false in case of version mismatch. WebPConfigInit()
@@ -186,15 +189,15 @@ static WEBP_INLINE int WebPConfigPreset(WebPConfig* config,
 // speed and final compressed size.
 // This function will overwrite several fields from config: 'method', 'quality'
 // and 'lossless'. Returns false in case of parameter error.
-WEBP_EXTERN(int) WebPConfigLosslessPreset(WebPConfig* config, int level);
+WEBP_EXTERN int WebPConfigLosslessPreset(WebPConfig* config, int level);
 
 // Returns true if 'config' is non-NULL and all configuration parameters are
 // within their valid ranges.
-WEBP_EXTERN(int) WebPValidateConfig(const WebPConfig* config);
+WEBP_EXTERN int WebPValidateConfig(const WebPConfig* config);
 
 //------------------------------------------------------------------------------
 // Input / Output
-// Structure for storing auxiliary statistics (mostly for lossy encoding).
+// Structure for storing auxiliary statistics.
 
 struct WebPAuxStats {
   int coded_size;         // final size
@@ -242,16 +245,16 @@ struct WebPMemoryWriter {
 };
 
 // The following must be called first before any use.
-WEBP_EXTERN(void) WebPMemoryWriterInit(WebPMemoryWriter* writer);
+WEBP_EXTERN void WebPMemoryWriterInit(WebPMemoryWriter* writer);
 
 // The following must be called to deallocate writer->mem memory. The 'writer'
 // object itself is not deallocated.
-WEBP_EXTERN(void) WebPMemoryWriterClear(WebPMemoryWriter* writer);
+WEBP_EXTERN void WebPMemoryWriterClear(WebPMemoryWriter* writer);
 // The custom writer to be used with WebPMemoryWriter as custom_ptr. Upon
 // completion, writer.mem and writer.size will hold the coded data.
 // writer.mem must be freed by calling WebPMemoryWriterClear.
-WEBP_EXTERN(int) WebPMemoryWrite(const uint8_t* data, size_t data_size,
-                                 const WebPPicture* picture);
+WEBP_EXTERN int WebPMemoryWrite(const uint8_t* data, size_t data_size,
+                                const WebPPicture* picture);
 
 // Progress hook, called from time to time to report progress. It can return
 // false to request an abort of the encoding process, or true otherwise if
@@ -354,7 +357,7 @@ struct WebPPicture {
 };
 
 // Internal, version-checked, entry point
-WEBP_EXTERN(int) WebPPictureInitInternal(WebPPicture*, int);
+WEBP_EXTERN int WebPPictureInitInternal(WebPPicture*, int);
 
 // Should always be called, to initialize the structure. Returns false in case
 // of version mismatch. WebPPictureInit() must have succeeded before using the
@@ -371,20 +374,20 @@ static WEBP_INLINE int WebPPictureInit(WebPPicture* picture) {
 // Allocate y/u/v buffers as per colorspace/width/height specification.
 // Note! This function will free the previous buffer if needed.
 // Returns false in case of memory error.
-WEBP_EXTERN(int) WebPPictureAlloc(WebPPicture* picture);
+WEBP_EXTERN int WebPPictureAlloc(WebPPicture* picture);
 
 // Release the memory allocated by WebPPictureAlloc() or WebPPictureImport*().
 // Note that this function does _not_ free the memory used by the 'picture'
 // object itself.
 // Besides memory (which is reclaimed) all other fields of 'picture' are
 // preserved.
-WEBP_EXTERN(void) WebPPictureFree(WebPPicture* picture);
+WEBP_EXTERN void WebPPictureFree(WebPPicture* picture);
 
 // Copy the pixels of *src into *dst, using WebPPictureAlloc. Upon return, *dst
 // will fully own the copied pixels (this is not a view). The 'dst' picture need
 // not be initialized as its content is overwritten.
 // Returns false in case of memory allocation error.
-WEBP_EXTERN(int) WebPPictureCopy(const WebPPicture* src, WebPPicture* dst);
+WEBP_EXTERN int WebPPictureCopy(const WebPPicture* src, WebPPicture* dst);
 
 // Compute the single distortion for packed planes of samples.
 // 'src' will be compared to 'ref', and the raw distortion stored into
@@ -393,19 +396,19 @@ WEBP_EXTERN(int) WebPPictureCopy(const WebPPicture* src, WebPPicture* dst);
 // 'x_step' is the horizontal stride (in bytes) between samples.
 // 'src/ref_stride' is the byte distance between rows.
 // Returns false in case of error (bad parameter, memory allocation error, ...).
-WEBP_EXTERN(int) WebPPlaneDistortion(const uint8_t* src, size_t src_stride,
-                                     const uint8_t* ref, size_t ref_stride,
-                                     int width, int height,
-                                     size_t x_step,
-                                     int type,   // 0 = PSNR, 1 = SSIM, 2 = LSIM
-                                     float* distortion, float* result);
+WEBP_EXTERN int WebPPlaneDistortion(const uint8_t* src, size_t src_stride,
+                                    const uint8_t* ref, size_t ref_stride,
+                                    int width, int height,
+                                    size_t x_step,
+                                    int type,   // 0 = PSNR, 1 = SSIM, 2 = LSIM
+                                    float* distortion, float* result);
 
 // Compute PSNR, SSIM or LSIM distortion metric between two pictures. Results
 // are in dB, stored in result[] in the B/G/R/A/All order. The distortion is
 // always performed using ARGB samples. Hence if the input is YUV(A), the
 // picture will be internally converted to ARGB (just for the measurement).
 // Warning: this function is rather CPU-intensive.
-WEBP_EXTERN(int) WebPPictureDistortion(
+WEBP_EXTERN int WebPPictureDistortion(
     const WebPPicture* src, const WebPPicture* ref,
     int metric_type,           // 0 = PSNR, 1 = SSIM, 2 = LSIM
     float result[5]);
@@ -418,8 +421,8 @@ WEBP_EXTERN(int) WebPPictureDistortion(
 // must be fully be comprised inside the 'src' source picture. If the source
 // picture uses the YUV420 colorspace, the top and left coordinates will be
 // snapped to even values.
-WEBP_EXTERN(int) WebPPictureCrop(WebPPicture* picture,
-                                 int left, int top, int width, int height);
+WEBP_EXTERN int WebPPictureCrop(WebPPicture* picture,
+                                int left, int top, int width, int height);
 
 // Extracts a view from 'src' picture into 'dst'. The rectangle for the view
 // is defined by the top-left corner pixel coordinates (left, top) as well
@@ -432,42 +435,42 @@ WEBP_EXTERN(int) WebPPictureCrop(WebPPicture* picture,
 // with WebPPictureInit() if it is different from 'src', since its content will
 // be overwritten.
 // Returns false in case of memory allocation error or invalid parameters.
-WEBP_EXTERN(int) WebPPictureView(const WebPPicture* src,
-                                 int left, int top, int width, int height,
-                                 WebPPicture* dst);
+WEBP_EXTERN int WebPPictureView(const WebPPicture* src,
+                                int left, int top, int width, int height,
+                                WebPPicture* dst);
 
 // Returns true if the 'picture' is actually a view and therefore does
 // not own the memory for pixels.
-WEBP_EXTERN(int) WebPPictureIsView(const WebPPicture* picture);
+WEBP_EXTERN int WebPPictureIsView(const WebPPicture* picture);
 
 // Rescale a picture to new dimension width x height.
 // If either 'width' or 'height' (but not both) is 0 the corresponding
 // dimension will be calculated preserving the aspect ratio.
 // No gamma correction is applied.
 // Returns false in case of error (invalid parameter or insufficient memory).
-WEBP_EXTERN(int) WebPPictureRescale(WebPPicture* pic, int width, int height);
+WEBP_EXTERN int WebPPictureRescale(WebPPicture* pic, int width, int height);
 
 // Colorspace conversion function to import RGB samples.
 // Previous buffer will be free'd, if any.
 // *rgb buffer should have a size of at least height * rgb_stride.
 // Returns false in case of memory error.
-WEBP_EXTERN(int) WebPPictureImportRGB(
+WEBP_EXTERN int WebPPictureImportRGB(
     WebPPicture* picture, const uint8_t* rgb, int rgb_stride);
 // Same, but for RGBA buffer.
-WEBP_EXTERN(int) WebPPictureImportRGBA(
+WEBP_EXTERN int WebPPictureImportRGBA(
     WebPPicture* picture, const uint8_t* rgba, int rgba_stride);
 // Same, but for RGBA buffer. Imports the RGB direct from the 32-bit format
 // input buffer ignoring the alpha channel. Avoids needing to copy the data
 // to a temporary 24-bit RGB buffer to import the RGB only.
-WEBP_EXTERN(int) WebPPictureImportRGBX(
+WEBP_EXTERN int WebPPictureImportRGBX(
     WebPPicture* picture, const uint8_t* rgbx, int rgbx_stride);
 
 // Variants of the above, but taking BGR(A|X) input.
-WEBP_EXTERN(int) WebPPictureImportBGR(
+WEBP_EXTERN int WebPPictureImportBGR(
     WebPPicture* picture, const uint8_t* bgr, int bgr_stride);
-WEBP_EXTERN(int) WebPPictureImportBGRA(
+WEBP_EXTERN int WebPPictureImportBGRA(
     WebPPicture* picture, const uint8_t* bgra, int bgra_stride);
-WEBP_EXTERN(int) WebPPictureImportBGRX(
+WEBP_EXTERN int WebPPictureImportBGRX(
     WebPPicture* picture, const uint8_t* bgrx, int bgrx_stride);
 
 // Converts picture->argb data to the YUV420A format. The 'colorspace'
@@ -476,14 +479,14 @@ WEBP_EXTERN(int) WebPPictureImportBGRX(
 // non-opaque transparent values is detected, and 'colorspace' will be
 // adjusted accordingly. Note that this method is lossy.
 // Returns false in case of error.
-WEBP_EXTERN(int) WebPPictureARGBToYUVA(WebPPicture* picture,
-                                       WebPEncCSP /*colorspace = WEBP_YUV420*/);
+WEBP_EXTERN int WebPPictureARGBToYUVA(WebPPicture* picture,
+                                      WebPEncCSP /*colorspace = WEBP_YUV420*/);
 
 // Same as WebPPictureARGBToYUVA(), but the conversion is done using
 // pseudo-random dithering with a strength 'dithering' between
 // 0.0 (no dithering) and 1.0 (maximum dithering). This is useful
 // for photographic picture.
-WEBP_EXTERN(int) WebPPictureARGBToYUVADithered(
+WEBP_EXTERN int WebPPictureARGBToYUVADithered(
     WebPPicture* picture, WebPEncCSP colorspace, float dithering);
 
 // Performs 'sharp' RGBA->YUVA420 downsampling and colorspace conversion.
@@ -491,9 +494,9 @@ WEBP_EXTERN(int) WebPPictureARGBToYUVADithered(
 // method is roughly 2x slower than WebPPictureARGBToYUVA() but produces better
 // and sharper YUV representation.
 // Returns false in case of error.
-WEBP_EXTERN(int) WebPPictureSharpARGBToYUVA(WebPPicture* picture);
+WEBP_EXTERN int WebPPictureSharpARGBToYUVA(WebPPicture* picture);
 // kept for backward compatibility:
-WEBP_EXTERN(int) WebPPictureSmartARGBToYUVA(WebPPicture* picture);
+WEBP_EXTERN int WebPPictureSmartARGBToYUVA(WebPPicture* picture);
 
 // Converts picture->yuv to picture->argb and sets picture->use_argb to true.
 // The input format must be YUV_420 or YUV_420A. The conversion from YUV420 to
@@ -501,22 +504,22 @@ WEBP_EXTERN(int) WebPPictureSmartARGBToYUVA(WebPPicture* picture);
 // Note that the use of this colorspace is discouraged if one has access to the
 // raw ARGB samples, since using YUV420 is comparatively lossy.
 // Returns false in case of error.
-WEBP_EXTERN(int) WebPPictureYUVAToARGB(WebPPicture* picture);
+WEBP_EXTERN int WebPPictureYUVAToARGB(WebPPicture* picture);
 
 // Helper function: given a width x height plane of RGBA or YUV(A) samples
-// clean-up the YUV or RGB samples under fully transparent area, to help
-// compressibility (no guarantee, though).
-WEBP_EXTERN(void) WebPCleanupTransparentArea(WebPPicture* picture);
+// clean-up or smoothen the YUV or RGB samples under fully transparent area,
+// to help compressibility (no guarantee, though).
+WEBP_EXTERN void WebPCleanupTransparentArea(WebPPicture* picture);
 
 // Scan the picture 'picture' for the presence of non fully opaque alpha values.
 // Returns true in such case. Otherwise returns false (indicating that the
 // alpha plane can be ignored altogether e.g.).
-WEBP_EXTERN(int) WebPPictureHasTransparency(const WebPPicture* picture);
+WEBP_EXTERN int WebPPictureHasTransparency(const WebPPicture* picture);
 
 // Remove the transparency information (if present) by blending the color with
 // the background color 'background_rgb' (specified as 24bit RGB triplet).
 // After this call, all alpha values are reset to 0xff.
-WEBP_EXTERN(void) WebPBlendAlpha(WebPPicture* pic, uint32_t background_rgb);
+WEBP_EXTERN void WebPBlendAlpha(WebPPicture* pic, uint32_t background_rgb);
 
 //------------------------------------------------------------------------------
 // Main call
@@ -531,7 +534,7 @@ WEBP_EXTERN(void) WebPBlendAlpha(WebPPicture* pic, uint32_t background_rgb);
 // the former for lossy encoding, and the latter for lossless encoding
 // (when config.lossless is true). Automatic conversion from one format to
 // another is provided but they both incur some loss.
-WEBP_EXTERN(int) WebPEncode(const WebPConfig* config, WebPPicture* picture);
+WEBP_EXTERN int WebPEncode(const WebPConfig* config, WebPPicture* picture);
 
 //------------------------------------------------------------------------------
 
diff --git a/media/libwebp/webp/mux.h b/media/libwebp/webp/mux.h
index daccc65e86..28bb4a41c9 100644
--- a/media/libwebp/webp/mux.h
+++ b/media/libwebp/webp/mux.h
@@ -98,13 +98,13 @@ typedef enum WebPChunkId {
 
 // Returns the version number of the mux library, packed in hexadecimal using
 // 8bits for each of major/minor/revision. E.g: v2.5.7 is 0x020507.
-WEBP_EXTERN(int) WebPGetMuxVersion(void);
+WEBP_EXTERN int WebPGetMuxVersion(void);
 
 //------------------------------------------------------------------------------
 // Life of a Mux object
 
 // Internal, version-checked, entry point
-WEBP_EXTERN(WebPMux*) WebPNewInternal(int);
+WEBP_EXTERN WebPMux* WebPNewInternal(int);
 
 // Creates an empty mux object.
 // Returns:
@@ -117,13 +117,13 @@ static WEBP_INLINE WebPMux* WebPMuxNew(void) {
 // Deletes the mux object.
 // Parameters:
 //   mux - (in/out) object to be deleted
-WEBP_EXTERN(void) WebPMuxDelete(WebPMux* mux);
+WEBP_EXTERN void WebPMuxDelete(WebPMux* mux);
 
 //------------------------------------------------------------------------------
 // Mux creation.
 
 // Internal, version-checked, entry point
-WEBP_EXTERN(WebPMux*) WebPMuxCreateInternal(const WebPData*, int, int);
+WEBP_EXTERN WebPMux* WebPMuxCreateInternal(const WebPData*, int, int);
 
 // Creates a mux object from raw data given in WebP RIFF format.
 // Parameters:
@@ -160,7 +160,7 @@ static WEBP_INLINE WebPMux* WebPMuxCreate(const WebPData* bitstream,
 //                               or if fourcc corresponds to an image chunk.
 //   WEBP_MUX_MEMORY_ERROR - on memory allocation error.
 //   WEBP_MUX_OK - on success.
-WEBP_EXTERN(WebPMuxError) WebPMuxSetChunk(
+WEBP_EXTERN WebPMuxError WebPMuxSetChunk(
     WebPMux* mux, const char fourcc[4], const WebPData* chunk_data,
     int copy_data);
 
@@ -176,7 +176,7 @@ WEBP_EXTERN(WebPMuxError) WebPMuxSetChunk(
 //                               or if fourcc corresponds to an image chunk.
 //   WEBP_MUX_NOT_FOUND - If mux does not contain a chunk with the given id.
 //   WEBP_MUX_OK - on success.
-WEBP_EXTERN(WebPMuxError) WebPMuxGetChunk(
+WEBP_EXTERN WebPMuxError WebPMuxGetChunk(
     const WebPMux* mux, const char fourcc[4], WebPData* chunk_data);
 
 // Deletes the chunk with the given 'fourcc' from the mux object.
@@ -189,7 +189,7 @@ WEBP_EXTERN(WebPMuxError) WebPMuxGetChunk(
 //                               or if fourcc corresponds to an image chunk.
 //   WEBP_MUX_NOT_FOUND - If mux does not contain a chunk with the given fourcc.
 //   WEBP_MUX_OK - on success.
-WEBP_EXTERN(WebPMuxError) WebPMuxDeleteChunk(
+WEBP_EXTERN WebPMuxError WebPMuxDeleteChunk(
     WebPMux* mux, const char fourcc[4]);
 
 //------------------------------------------------------------------------------
@@ -222,7 +222,7 @@ struct WebPMuxFrameInfo {
 //   WEBP_MUX_INVALID_ARGUMENT - if mux is NULL or bitstream is NULL.
 //   WEBP_MUX_MEMORY_ERROR - on memory allocation error.
 //   WEBP_MUX_OK - on success.
-WEBP_EXTERN(WebPMuxError) WebPMuxSetImage(
+WEBP_EXTERN WebPMuxError WebPMuxSetImage(
     WebPMux* mux, const WebPData* bitstream, int copy_data);
 
 // Adds a frame at the end of the mux object.
@@ -241,7 +241,7 @@ WEBP_EXTERN(WebPMuxError) WebPMuxSetImage(
 //                               or if content of 'frame' is invalid.
 //   WEBP_MUX_MEMORY_ERROR - on memory allocation error.
 //   WEBP_MUX_OK - on success.
-WEBP_EXTERN(WebPMuxError) WebPMuxPushFrame(
+WEBP_EXTERN WebPMuxError WebPMuxPushFrame(
     WebPMux* mux, const WebPMuxFrameInfo* frame, int copy_data);
 
 // Gets the nth frame from the mux object.
@@ -259,7 +259,7 @@ WEBP_EXTERN(WebPMuxError) WebPMuxPushFrame(
 //   WEBP_MUX_BAD_DATA - if nth frame chunk in mux is invalid.
 //   WEBP_MUX_MEMORY_ERROR - on memory allocation error.
 //   WEBP_MUX_OK - on success.
-WEBP_EXTERN(WebPMuxError) WebPMuxGetFrame(
+WEBP_EXTERN WebPMuxError WebPMuxGetFrame(
     const WebPMux* mux, uint32_t nth, WebPMuxFrameInfo* frame);
 
 // Deletes a frame from the mux object.
@@ -272,7 +272,7 @@ WEBP_EXTERN(WebPMuxError) WebPMuxGetFrame(
 //   WEBP_MUX_NOT_FOUND - If there are less than nth frames in the mux object
 //                        before deletion.
 //   WEBP_MUX_OK - on success.
-WEBP_EXTERN(WebPMuxError) WebPMuxDeleteFrame(WebPMux* mux, uint32_t nth);
+WEBP_EXTERN WebPMuxError WebPMuxDeleteFrame(WebPMux* mux, uint32_t nth);
 
 //------------------------------------------------------------------------------
 // Animation.
@@ -296,7 +296,7 @@ struct WebPMuxAnimParams {
 //   WEBP_MUX_INVALID_ARGUMENT - if mux or params is NULL.
 //   WEBP_MUX_MEMORY_ERROR - on memory allocation error.
 //   WEBP_MUX_OK - on success.
-WEBP_EXTERN(WebPMuxError) WebPMuxSetAnimationParams(
+WEBP_EXTERN WebPMuxError WebPMuxSetAnimationParams(
     WebPMux* mux, const WebPMuxAnimParams* params);
 
 // Gets the animation parameters from the mux object.
@@ -307,7 +307,7 @@ WEBP_EXTERN(WebPMuxError) WebPMuxSetAnimationParams(
 //   WEBP_MUX_INVALID_ARGUMENT - if mux or params is NULL.
 //   WEBP_MUX_NOT_FOUND - if ANIM chunk is not present in mux object.
 //   WEBP_MUX_OK - on success.
-WEBP_EXTERN(WebPMuxError) WebPMuxGetAnimationParams(
+WEBP_EXTERN WebPMuxError WebPMuxGetAnimationParams(
     const WebPMux* mux, WebPMuxAnimParams* params);
 
 //------------------------------------------------------------------------------
@@ -328,8 +328,8 @@ WEBP_EXTERN(WebPMuxError) WebPMuxGetAnimationParams(
 //   WEBP_MUX_INVALID_ARGUMENT - if mux is NULL; or
 //                               width or height are invalid or out of bounds
 //   WEBP_MUX_OK - on success.
-WEBP_EXTERN(WebPMuxError) WebPMuxSetCanvasSize(WebPMux* mux,
-                                               int width, int height);
+WEBP_EXTERN WebPMuxError WebPMuxSetCanvasSize(WebPMux* mux,
+                                              int width, int height);
 
 // Gets the canvas size from the mux object.
 // Note: This method assumes that the VP8X chunk, if present, is up-to-date.
@@ -343,8 +343,8 @@ WEBP_EXTERN(WebPMuxError) WebPMuxSetCanvasSize(WebPMux* mux,
 //   WEBP_MUX_INVALID_ARGUMENT - if mux, width or height is NULL.
 //   WEBP_MUX_BAD_DATA - if VP8X/VP8/VP8L chunk or canvas size is invalid.
 //   WEBP_MUX_OK - on success.
-WEBP_EXTERN(WebPMuxError) WebPMuxGetCanvasSize(const WebPMux* mux,
-                                               int* width, int* height);
+WEBP_EXTERN WebPMuxError WebPMuxGetCanvasSize(const WebPMux* mux,
+                                              int* width, int* height);
 
 // Gets the feature flags from the mux object.
 // Note: This method assumes that the VP8X chunk, if present, is up-to-date.
@@ -359,8 +359,8 @@ WEBP_EXTERN(WebPMuxError) WebPMuxGetCanvasSize(const WebPMux* mux,
 //   WEBP_MUX_INVALID_ARGUMENT - if mux or flags is NULL.
 //   WEBP_MUX_BAD_DATA - if VP8X/VP8/VP8L chunk or canvas size is invalid.
 //   WEBP_MUX_OK - on success.
-WEBP_EXTERN(WebPMuxError) WebPMuxGetFeatures(const WebPMux* mux,
-                                             uint32_t* flags);
+WEBP_EXTERN WebPMuxError WebPMuxGetFeatures(const WebPMux* mux,
+                                            uint32_t* flags);
 
 // Gets number of chunks with the given 'id' in the mux object.
 // Parameters:
@@ -370,8 +370,8 @@ WEBP_EXTERN(WebPMuxError) WebPMuxGetFeatures(const WebPMux* mux,
 // Returns:
 //   WEBP_MUX_INVALID_ARGUMENT - if mux, or num_elements is NULL.
 //   WEBP_MUX_OK - on success.
-WEBP_EXTERN(WebPMuxError) WebPMuxNumChunks(const WebPMux* mux,
-                                           WebPChunkId id, int* num_elements);
+WEBP_EXTERN WebPMuxError WebPMuxNumChunks(const WebPMux* mux,
+                                          WebPChunkId id, int* num_elements);
 
 // Assembles all chunks in WebP RIFF format and returns in 'assembled_data'.
 // This function also validates the mux object.
@@ -388,8 +388,8 @@ WEBP_EXTERN(WebPMuxError) WebPMuxNumChunks(const WebPMux* mux,
 //   WEBP_MUX_INVALID_ARGUMENT - if mux or assembled_data is NULL.
 //   WEBP_MUX_MEMORY_ERROR - on memory allocation error.
 //   WEBP_MUX_OK - on success.
-WEBP_EXTERN(WebPMuxError) WebPMuxAssemble(WebPMux* mux,
-                                          WebPData* assembled_data);
+WEBP_EXTERN WebPMuxError WebPMuxAssemble(WebPMux* mux,
+                                         WebPData* assembled_data);
 
 //------------------------------------------------------------------------------
 // WebPAnimEncoder API
@@ -442,7 +442,7 @@ struct WebPAnimEncoderOptions {
 };
 
 // Internal, version-checked, entry point.
-WEBP_EXTERN(int) WebPAnimEncoderOptionsInitInternal(
+WEBP_EXTERN int WebPAnimEncoderOptionsInitInternal(
     WebPAnimEncoderOptions*, int);
 
 // Should always be called, to initialize a fresh WebPAnimEncoderOptions
@@ -455,7 +455,7 @@ static WEBP_INLINE int WebPAnimEncoderOptionsInit(
 }
 
 // Internal, version-checked, entry point.
-WEBP_EXTERN(WebPAnimEncoder*) WebPAnimEncoderNewInternal(
+WEBP_EXTERN WebPAnimEncoder* WebPAnimEncoderNewInternal(
     int, int, const WebPAnimEncoderOptions*, int);
 
 // Creates and initializes a WebPAnimEncoder object.
@@ -490,7 +490,7 @@ static WEBP_INLINE WebPAnimEncoder* WebPAnimEncoderNew(
 // Returns:
 //   On error, returns false and frame->error_code is set appropriately.
 //   Otherwise, returns true.
-WEBP_EXTERN(int) WebPAnimEncoderAdd(
+WEBP_EXTERN int WebPAnimEncoderAdd(
     WebPAnimEncoder* enc, struct WebPPicture* frame, int timestamp_ms,
     const struct WebPConfig* config);
 
@@ -503,8 +503,8 @@ WEBP_EXTERN(int) WebPAnimEncoderAdd(
 //   webp_data - (out) generated WebP bitstream.
 // Returns:
 //   True on success.
-WEBP_EXTERN(int) WebPAnimEncoderAssemble(WebPAnimEncoder* enc,
-                                         WebPData* webp_data);
+WEBP_EXTERN int WebPAnimEncoderAssemble(WebPAnimEncoder* enc,
+                                        WebPData* webp_data);
 
 // Get error string corresponding to the most recent call using 'enc'. The
 // returned string is owned by 'enc' and is valid only until the next call to
@@ -514,12 +514,12 @@ WEBP_EXTERN(int) WebPAnimEncoderAssemble(WebPAnimEncoder* enc,
 // Returns:
 //   NULL if 'enc' is NULL. Otherwise, returns the error string if the last call
 //   to 'enc' had an error, or an empty string if the last call was a success.
-WEBP_EXTERN(const char*) WebPAnimEncoderGetError(WebPAnimEncoder* enc);
+WEBP_EXTERN const char* WebPAnimEncoderGetError(WebPAnimEncoder* enc);
 
 // Deletes the WebPAnimEncoder object.
 // Parameters:
 //   enc - (in/out) object to be deleted
-WEBP_EXTERN(void) WebPAnimEncoderDelete(WebPAnimEncoder* enc);
+WEBP_EXTERN void WebPAnimEncoderDelete(WebPAnimEncoder* enc);
 
 //------------------------------------------------------------------------------
 
diff --git a/media/libwebp/webp/types.h b/media/libwebp/webp/types.h
index 98fff35a11..989a763f0d 100644
--- a/media/libwebp/webp/types.h
+++ b/media/libwebp/webp/types.h
@@ -40,9 +40,9 @@ typedef long long int int64_t;
 // This explicitly marks library functions and allows for changing the
 // signature for e.g., Windows DLL builds.
 # if defined(__GNUC__) && __GNUC__ >= 4
-#  define WEBP_EXTERN(type) extern __attribute__ ((visibility ("default"))) type
+#  define WEBP_EXTERN extern __attribute__ ((visibility ("default")))
 # else
-#  define WEBP_EXTERN(type) extern type
+#  define WEBP_EXTERN extern
 # endif  /* __GNUC__ >= 4 */
 #endif  /* WEBP_EXTERN */