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Diffstat (limited to 'media/libjpeg/simd/arm/jdcolext-neon.c')
-rw-r--r--media/libjpeg/simd/arm/jdcolext-neon.c374
1 files changed, 374 insertions, 0 deletions
diff --git a/media/libjpeg/simd/arm/jdcolext-neon.c b/media/libjpeg/simd/arm/jdcolext-neon.c
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+++ b/media/libjpeg/simd/arm/jdcolext-neon.c
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+/*
+ * jdcolext-neon.c - colorspace conversion (Arm Neon)
+ *
+ * Copyright (C) 2020, Arm Limited. All Rights Reserved.
+ * Copyright (C) 2020, D. R. Commander. All Rights Reserved.
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty. In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ * claim that you wrote the original software. If you use this software
+ * in a product, an acknowledgment in the product documentation would be
+ * appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ * misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ */
+
+/* This file is included by jdcolor-neon.c. */
+
+
+/* YCbCr -> RGB conversion is defined by the following equations:
+ * R = Y + 1.40200 * (Cr - 128)
+ * G = Y - 0.34414 * (Cb - 128) - 0.71414 * (Cr - 128)
+ * B = Y + 1.77200 * (Cb - 128)
+ *
+ * Scaled integer constants are used to avoid floating-point arithmetic:
+ * 0.3441467 = 11277 * 2^-15
+ * 0.7141418 = 23401 * 2^-15
+ * 1.4020386 = 22971 * 2^-14
+ * 1.7720337 = 29033 * 2^-14
+ * These constants are defined in jdcolor-neon.c.
+ *
+ * To ensure correct results, rounding is used when descaling.
+ */
+
+/* Notes on safe memory access for YCbCr -> RGB conversion routines:
+ *
+ * Input memory buffers can be safely overread up to the next multiple of
+ * ALIGN_SIZE bytes, since they are always allocated by alloc_sarray() in
+ * jmemmgr.c.
+ *
+ * The output buffer cannot safely be written beyond output_width, since
+ * output_buf points to a possibly unpadded row in the decompressed image
+ * buffer allocated by the calling program.
+ */
+
+void jsimd_ycc_rgb_convert_neon(JDIMENSION output_width, JSAMPIMAGE input_buf,
+ JDIMENSION input_row, JSAMPARRAY output_buf,
+ int num_rows)
+{
+ JSAMPROW outptr;
+ /* Pointers to Y, Cb, and Cr data */
+ JSAMPROW inptr0, inptr1, inptr2;
+
+ const int16x4_t consts = vld1_s16(jsimd_ycc_rgb_convert_neon_consts);
+ const int16x8_t neg_128 = vdupq_n_s16(-128);
+
+ while (--num_rows >= 0) {
+ inptr0 = input_buf[0][input_row];
+ inptr1 = input_buf[1][input_row];
+ inptr2 = input_buf[2][input_row];
+ input_row++;
+ outptr = *output_buf++;
+ int cols_remaining = output_width;
+ for (; cols_remaining >= 16; cols_remaining -= 16) {
+ uint8x16_t y = vld1q_u8(inptr0);
+ uint8x16_t cb = vld1q_u8(inptr1);
+ uint8x16_t cr = vld1q_u8(inptr2);
+ /* Subtract 128 from Cb and Cr. */
+ int16x8_t cr_128_l =
+ vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(neg_128),
+ vget_low_u8(cr)));
+ int16x8_t cr_128_h =
+ vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(neg_128),
+ vget_high_u8(cr)));
+ int16x8_t cb_128_l =
+ vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(neg_128),
+ vget_low_u8(cb)));
+ int16x8_t cb_128_h =
+ vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(neg_128),
+ vget_high_u8(cb)));
+ /* Compute G-Y: - 0.34414 * (Cb - 128) - 0.71414 * (Cr - 128) */
+ int32x4_t g_sub_y_ll = vmull_lane_s16(vget_low_s16(cb_128_l), consts, 0);
+ int32x4_t g_sub_y_lh = vmull_lane_s16(vget_high_s16(cb_128_l),
+ consts, 0);
+ int32x4_t g_sub_y_hl = vmull_lane_s16(vget_low_s16(cb_128_h), consts, 0);
+ int32x4_t g_sub_y_hh = vmull_lane_s16(vget_high_s16(cb_128_h),
+ consts, 0);
+ g_sub_y_ll = vmlsl_lane_s16(g_sub_y_ll, vget_low_s16(cr_128_l),
+ consts, 1);
+ g_sub_y_lh = vmlsl_lane_s16(g_sub_y_lh, vget_high_s16(cr_128_l),
+ consts, 1);
+ g_sub_y_hl = vmlsl_lane_s16(g_sub_y_hl, vget_low_s16(cr_128_h),
+ consts, 1);
+ g_sub_y_hh = vmlsl_lane_s16(g_sub_y_hh, vget_high_s16(cr_128_h),
+ consts, 1);
+ /* Descale G components: shift right 15, round, and narrow to 16-bit. */
+ int16x8_t g_sub_y_l = vcombine_s16(vrshrn_n_s32(g_sub_y_ll, 15),
+ vrshrn_n_s32(g_sub_y_lh, 15));
+ int16x8_t g_sub_y_h = vcombine_s16(vrshrn_n_s32(g_sub_y_hl, 15),
+ vrshrn_n_s32(g_sub_y_hh, 15));
+ /* Compute R-Y: 1.40200 * (Cr - 128) */
+ int16x8_t r_sub_y_l = vqrdmulhq_lane_s16(vshlq_n_s16(cr_128_l, 1),
+ consts, 2);
+ int16x8_t r_sub_y_h = vqrdmulhq_lane_s16(vshlq_n_s16(cr_128_h, 1),
+ consts, 2);
+ /* Compute B-Y: 1.77200 * (Cb - 128) */
+ int16x8_t b_sub_y_l = vqrdmulhq_lane_s16(vshlq_n_s16(cb_128_l, 1),
+ consts, 3);
+ int16x8_t b_sub_y_h = vqrdmulhq_lane_s16(vshlq_n_s16(cb_128_h, 1),
+ consts, 3);
+ /* Add Y. */
+ int16x8_t r_l =
+ vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(r_sub_y_l),
+ vget_low_u8(y)));
+ int16x8_t r_h =
+ vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(r_sub_y_h),
+ vget_high_u8(y)));
+ int16x8_t b_l =
+ vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(b_sub_y_l),
+ vget_low_u8(y)));
+ int16x8_t b_h =
+ vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(b_sub_y_h),
+ vget_high_u8(y)));
+ int16x8_t g_l =
+ vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(g_sub_y_l),
+ vget_low_u8(y)));
+ int16x8_t g_h =
+ vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(g_sub_y_h),
+ vget_high_u8(y)));
+
+#if RGB_PIXELSIZE == 4
+ uint8x16x4_t rgba;
+ /* Convert each component to unsigned and narrow, clamping to [0-255]. */
+ rgba.val[RGB_RED] = vcombine_u8(vqmovun_s16(r_l), vqmovun_s16(r_h));
+ rgba.val[RGB_GREEN] = vcombine_u8(vqmovun_s16(g_l), vqmovun_s16(g_h));
+ rgba.val[RGB_BLUE] = vcombine_u8(vqmovun_s16(b_l), vqmovun_s16(b_h));
+ /* Set alpha channel to opaque (0xFF). */
+ rgba.val[RGB_ALPHA] = vdupq_n_u8(0xFF);
+ /* Store RGBA pixel data to memory. */
+ vst4q_u8(outptr, rgba);
+#elif RGB_PIXELSIZE == 3
+ uint8x16x3_t rgb;
+ /* Convert each component to unsigned and narrow, clamping to [0-255]. */
+ rgb.val[RGB_RED] = vcombine_u8(vqmovun_s16(r_l), vqmovun_s16(r_h));
+ rgb.val[RGB_GREEN] = vcombine_u8(vqmovun_s16(g_l), vqmovun_s16(g_h));
+ rgb.val[RGB_BLUE] = vcombine_u8(vqmovun_s16(b_l), vqmovun_s16(b_h));
+ /* Store RGB pixel data to memory. */
+ vst3q_u8(outptr, rgb);
+#else
+ /* Pack R, G, and B values in ratio 5:6:5. */
+ uint16x8_t rgb565_l = vqshluq_n_s16(r_l, 8);
+ rgb565_l = vsriq_n_u16(rgb565_l, vqshluq_n_s16(g_l, 8), 5);
+ rgb565_l = vsriq_n_u16(rgb565_l, vqshluq_n_s16(b_l, 8), 11);
+ uint16x8_t rgb565_h = vqshluq_n_s16(r_h, 8);
+ rgb565_h = vsriq_n_u16(rgb565_h, vqshluq_n_s16(g_h, 8), 5);
+ rgb565_h = vsriq_n_u16(rgb565_h, vqshluq_n_s16(b_h, 8), 11);
+ /* Store RGB pixel data to memory. */
+ vst1q_u16((uint16_t *)outptr, rgb565_l);
+ vst1q_u16(((uint16_t *)outptr) + 8, rgb565_h);
+#endif
+
+ /* Increment pointers. */
+ inptr0 += 16;
+ inptr1 += 16;
+ inptr2 += 16;
+ outptr += (RGB_PIXELSIZE * 16);
+ }
+
+ if (cols_remaining >= 8) {
+ uint8x8_t y = vld1_u8(inptr0);
+ uint8x8_t cb = vld1_u8(inptr1);
+ uint8x8_t cr = vld1_u8(inptr2);
+ /* Subtract 128 from Cb and Cr. */
+ int16x8_t cr_128 =
+ vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(neg_128), cr));
+ int16x8_t cb_128 =
+ vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(neg_128), cb));
+ /* Compute G-Y: - 0.34414 * (Cb - 128) - 0.71414 * (Cr - 128) */
+ int32x4_t g_sub_y_l = vmull_lane_s16(vget_low_s16(cb_128), consts, 0);
+ int32x4_t g_sub_y_h = vmull_lane_s16(vget_high_s16(cb_128), consts, 0);
+ g_sub_y_l = vmlsl_lane_s16(g_sub_y_l, vget_low_s16(cr_128), consts, 1);
+ g_sub_y_h = vmlsl_lane_s16(g_sub_y_h, vget_high_s16(cr_128), consts, 1);
+ /* Descale G components: shift right 15, round, and narrow to 16-bit. */
+ int16x8_t g_sub_y = vcombine_s16(vrshrn_n_s32(g_sub_y_l, 15),
+ vrshrn_n_s32(g_sub_y_h, 15));
+ /* Compute R-Y: 1.40200 * (Cr - 128) */
+ int16x8_t r_sub_y = vqrdmulhq_lane_s16(vshlq_n_s16(cr_128, 1),
+ consts, 2);
+ /* Compute B-Y: 1.77200 * (Cb - 128) */
+ int16x8_t b_sub_y = vqrdmulhq_lane_s16(vshlq_n_s16(cb_128, 1),
+ consts, 3);
+ /* Add Y. */
+ int16x8_t r =
+ vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(r_sub_y), y));
+ int16x8_t b =
+ vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(b_sub_y), y));
+ int16x8_t g =
+ vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(g_sub_y), y));
+
+#if RGB_PIXELSIZE == 4
+ uint8x8x4_t rgba;
+ /* Convert each component to unsigned and narrow, clamping to [0-255]. */
+ rgba.val[RGB_RED] = vqmovun_s16(r);
+ rgba.val[RGB_GREEN] = vqmovun_s16(g);
+ rgba.val[RGB_BLUE] = vqmovun_s16(b);
+ /* Set alpha channel to opaque (0xFF). */
+ rgba.val[RGB_ALPHA] = vdup_n_u8(0xFF);
+ /* Store RGBA pixel data to memory. */
+ vst4_u8(outptr, rgba);
+#elif RGB_PIXELSIZE == 3
+ uint8x8x3_t rgb;
+ /* Convert each component to unsigned and narrow, clamping to [0-255]. */
+ rgb.val[RGB_RED] = vqmovun_s16(r);
+ rgb.val[RGB_GREEN] = vqmovun_s16(g);
+ rgb.val[RGB_BLUE] = vqmovun_s16(b);
+ /* Store RGB pixel data to memory. */
+ vst3_u8(outptr, rgb);
+#else
+ /* Pack R, G, and B values in ratio 5:6:5. */
+ uint16x8_t rgb565 = vqshluq_n_s16(r, 8);
+ rgb565 = vsriq_n_u16(rgb565, vqshluq_n_s16(g, 8), 5);
+ rgb565 = vsriq_n_u16(rgb565, vqshluq_n_s16(b, 8), 11);
+ /* Store RGB pixel data to memory. */
+ vst1q_u16((uint16_t *)outptr, rgb565);
+#endif
+
+ /* Increment pointers. */
+ inptr0 += 8;
+ inptr1 += 8;
+ inptr2 += 8;
+ outptr += (RGB_PIXELSIZE * 8);
+ cols_remaining -= 8;
+ }
+
+ /* Handle the tail elements. */
+ if (cols_remaining > 0) {
+ uint8x8_t y = vld1_u8(inptr0);
+ uint8x8_t cb = vld1_u8(inptr1);
+ uint8x8_t cr = vld1_u8(inptr2);
+ /* Subtract 128 from Cb and Cr. */
+ int16x8_t cr_128 =
+ vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(neg_128), cr));
+ int16x8_t cb_128 =
+ vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(neg_128), cb));
+ /* Compute G-Y: - 0.34414 * (Cb - 128) - 0.71414 * (Cr - 128) */
+ int32x4_t g_sub_y_l = vmull_lane_s16(vget_low_s16(cb_128), consts, 0);
+ int32x4_t g_sub_y_h = vmull_lane_s16(vget_high_s16(cb_128), consts, 0);
+ g_sub_y_l = vmlsl_lane_s16(g_sub_y_l, vget_low_s16(cr_128), consts, 1);
+ g_sub_y_h = vmlsl_lane_s16(g_sub_y_h, vget_high_s16(cr_128), consts, 1);
+ /* Descale G components: shift right 15, round, and narrow to 16-bit. */
+ int16x8_t g_sub_y = vcombine_s16(vrshrn_n_s32(g_sub_y_l, 15),
+ vrshrn_n_s32(g_sub_y_h, 15));
+ /* Compute R-Y: 1.40200 * (Cr - 128) */
+ int16x8_t r_sub_y = vqrdmulhq_lane_s16(vshlq_n_s16(cr_128, 1),
+ consts, 2);
+ /* Compute B-Y: 1.77200 * (Cb - 128) */
+ int16x8_t b_sub_y = vqrdmulhq_lane_s16(vshlq_n_s16(cb_128, 1),
+ consts, 3);
+ /* Add Y. */
+ int16x8_t r =
+ vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(r_sub_y), y));
+ int16x8_t b =
+ vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(b_sub_y), y));
+ int16x8_t g =
+ vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(g_sub_y), y));
+
+#if RGB_PIXELSIZE == 4
+ uint8x8x4_t rgba;
+ /* Convert each component to unsigned and narrow, clamping to [0-255]. */
+ rgba.val[RGB_RED] = vqmovun_s16(r);
+ rgba.val[RGB_GREEN] = vqmovun_s16(g);
+ rgba.val[RGB_BLUE] = vqmovun_s16(b);
+ /* Set alpha channel to opaque (0xFF). */
+ rgba.val[RGB_ALPHA] = vdup_n_u8(0xFF);
+ /* Store RGBA pixel data to memory. */
+ switch (cols_remaining) {
+ case 7:
+ vst4_lane_u8(outptr + 6 * RGB_PIXELSIZE, rgba, 6);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 6:
+ vst4_lane_u8(outptr + 5 * RGB_PIXELSIZE, rgba, 5);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 5:
+ vst4_lane_u8(outptr + 4 * RGB_PIXELSIZE, rgba, 4);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 4:
+ vst4_lane_u8(outptr + 3 * RGB_PIXELSIZE, rgba, 3);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 3:
+ vst4_lane_u8(outptr + 2 * RGB_PIXELSIZE, rgba, 2);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 2:
+ vst4_lane_u8(outptr + RGB_PIXELSIZE, rgba, 1);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 1:
+ vst4_lane_u8(outptr, rgba, 0);
+ FALLTHROUGH /*FALLTHROUGH*/
+ default:
+ break;
+ }
+#elif RGB_PIXELSIZE == 3
+ uint8x8x3_t rgb;
+ /* Convert each component to unsigned and narrow, clamping to [0-255]. */
+ rgb.val[RGB_RED] = vqmovun_s16(r);
+ rgb.val[RGB_GREEN] = vqmovun_s16(g);
+ rgb.val[RGB_BLUE] = vqmovun_s16(b);
+ /* Store RGB pixel data to memory. */
+ switch (cols_remaining) {
+ case 7:
+ vst3_lane_u8(outptr + 6 * RGB_PIXELSIZE, rgb, 6);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 6:
+ vst3_lane_u8(outptr + 5 * RGB_PIXELSIZE, rgb, 5);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 5:
+ vst3_lane_u8(outptr + 4 * RGB_PIXELSIZE, rgb, 4);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 4:
+ vst3_lane_u8(outptr + 3 * RGB_PIXELSIZE, rgb, 3);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 3:
+ vst3_lane_u8(outptr + 2 * RGB_PIXELSIZE, rgb, 2);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 2:
+ vst3_lane_u8(outptr + RGB_PIXELSIZE, rgb, 1);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 1:
+ vst3_lane_u8(outptr, rgb, 0);
+ FALLTHROUGH /*FALLTHROUGH*/
+ default:
+ break;
+ }
+#else
+ /* Pack R, G, and B values in ratio 5:6:5. */
+ uint16x8_t rgb565 = vqshluq_n_s16(r, 8);
+ rgb565 = vsriq_n_u16(rgb565, vqshluq_n_s16(g, 8), 5);
+ rgb565 = vsriq_n_u16(rgb565, vqshluq_n_s16(b, 8), 11);
+ /* Store RGB565 pixel data to memory. */
+ switch (cols_remaining) {
+ case 7:
+ vst1q_lane_u16((uint16_t *)(outptr + 6 * RGB_PIXELSIZE), rgb565, 6);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 6:
+ vst1q_lane_u16((uint16_t *)(outptr + 5 * RGB_PIXELSIZE), rgb565, 5);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 5:
+ vst1q_lane_u16((uint16_t *)(outptr + 4 * RGB_PIXELSIZE), rgb565, 4);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 4:
+ vst1q_lane_u16((uint16_t *)(outptr + 3 * RGB_PIXELSIZE), rgb565, 3);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 3:
+ vst1q_lane_u16((uint16_t *)(outptr + 2 * RGB_PIXELSIZE), rgb565, 2);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 2:
+ vst1q_lane_u16((uint16_t *)(outptr + RGB_PIXELSIZE), rgb565, 1);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 1:
+ vst1q_lane_u16((uint16_t *)outptr, rgb565, 0);
+ FALLTHROUGH /*FALLTHROUGH*/
+ default:
+ break;
+ }
+#endif
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.26.2) at 2024-11-09 16:29:07 +0000