Add m-esr52 at 52.6.0

1 files changed, 565 insertions, 0 deletions

diff --git a/image/ClippedImage.cpp b/image/ClippedImage.cpp
new file mode 100644
index 0000000000..5394718512
--- /dev/null
+++ b/image/ClippedImage.cpp
@@ -0,0 +1,565 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ClippedImage.h"
+
+#include <algorithm>
+#include <new>      // Workaround for bug in VS10; see bug 981264.
+#include <cmath>
+#include <utility>
+
+#include "gfxDrawable.h"
+#include "gfxPlatform.h"
+#include "gfxUtils.h"
+#include "mozilla/gfx/2D.h"
+#include "mozilla/Move.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/Pair.h"
+#include "mozilla/Tuple.h"
+
+#include "ImageRegion.h"
+#include "Orientation.h"
+#include "SVGImageContext.h"
+
+namespace mozilla {
+
+using namespace gfx;
+using layers::LayerManager;
+using layers::ImageContainer;
+using std::make_pair;
+using std::max;
+using std::modf;
+using std::pair;
+
+namespace image {
+
+class ClippedImageCachedSurface
+{
+public:
+  ClippedImageCachedSurface(already_AddRefed<SourceSurface> aSurface,
+                            const nsIntSize& aSize,
+                            const Maybe<SVGImageContext>& aSVGContext,
+                            float aFrame,
+                            uint32_t aFlags,
+                            DrawResult aDrawResult)
+    : mSurface(aSurface)
+    , mSize(aSize)
+    , mSVGContext(aSVGContext)
+    , mFrame(aFrame)
+    , mFlags(aFlags)
+    , mDrawResult(aDrawResult)
+  {
+    MOZ_ASSERT(mSurface, "Must have a valid surface");
+  }
+
+  bool Matches(const nsIntSize& aSize,
+               const Maybe<SVGImageContext>& aSVGContext,
+               float aFrame,
+               uint32_t aFlags) const
+  {
+    return mSize == aSize &&
+           mSVGContext == aSVGContext &&
+           mFrame == aFrame &&
+           mFlags == aFlags;
+  }
+
+  already_AddRefed<SourceSurface> Surface() const
+  {
+    RefPtr<SourceSurface> surf(mSurface);
+    return surf.forget();
+  }
+
+  DrawResult GetDrawResult() const
+  {
+    return mDrawResult;
+  }
+
+  bool NeedsRedraw() const
+  {
+    return mDrawResult != DrawResult::SUCCESS &&
+           mDrawResult != DrawResult::BAD_IMAGE;
+  }
+
+private:
+  RefPtr<SourceSurface>  mSurface;
+  const nsIntSize        mSize;
+  Maybe<SVGImageContext> mSVGContext;
+  const float            mFrame;
+  const uint32_t         mFlags;
+  const DrawResult       mDrawResult;
+};
+
+class DrawSingleTileCallback : public gfxDrawingCallback
+{
+public:
+  DrawSingleTileCallback(ClippedImage* aImage,
+                         const nsIntSize& aSize,
+                         const Maybe<SVGImageContext>& aSVGContext,
+                         uint32_t aWhichFrame,
+                         uint32_t aFlags)
+    : mImage(aImage)
+    , mSize(aSize)
+    , mSVGContext(aSVGContext)
+    , mWhichFrame(aWhichFrame)
+    , mFlags(aFlags)
+    , mDrawResult(DrawResult::NOT_READY)
+  {
+    MOZ_ASSERT(mImage, "Must have an image to clip");
+  }
+
+  virtual bool operator()(gfxContext* aContext,
+                          const gfxRect& aFillRect,
+                          const SamplingFilter aSamplingFilter,
+                          const gfxMatrix& aTransform)
+  {
+    MOZ_ASSERT(aTransform.IsIdentity(),
+               "Caller is probably CreateSamplingRestrictedDrawable, "
+               "which should not happen");
+
+    // Draw the image. |gfxCallbackDrawable| always calls this function with
+    // arguments that guarantee we never tile.
+    mDrawResult =
+      mImage->DrawSingleTile(aContext, mSize, ImageRegion::Create(aFillRect),
+                             mWhichFrame, aSamplingFilter, mSVGContext, mFlags);
+
+    return true;
+  }
+
+  DrawResult GetDrawResult() { return mDrawResult; }
+
+private:
+  RefPtr<ClippedImage>        mImage;
+  const nsIntSize               mSize;
+  const Maybe<SVGImageContext>& mSVGContext;
+  const uint32_t                mWhichFrame;
+  const uint32_t                mFlags;
+  DrawResult                    mDrawResult;
+};
+
+ClippedImage::ClippedImage(Image* aImage,
+                           nsIntRect aClip,
+                           const Maybe<nsSize>& aSVGViewportSize)
+  : ImageWrapper(aImage)
+  , mClip(aClip)
+{
+  MOZ_ASSERT(aImage != nullptr, "ClippedImage requires an existing Image");
+  MOZ_ASSERT_IF(aSVGViewportSize,
+                aImage->GetType() == imgIContainer::TYPE_VECTOR);
+  if (aSVGViewportSize) {
+    mSVGViewportSize = Some(aSVGViewportSize->ToNearestPixels(
+                                        nsPresContext::AppUnitsPerCSSPixel()));
+  }
+}
+
+ClippedImage::~ClippedImage()
+{ }
+
+bool
+ClippedImage::ShouldClip()
+{
+  // We need to evaluate the clipping region against the image's width and
+  // height once they're available to determine if it's valid and whether we
+  // actually need to do any work. We may fail if the image's width and height
+  // aren't available yet, in which case we'll try again later.
+  if (mShouldClip.isNothing()) {
+    int32_t width, height;
+    RefPtr<ProgressTracker> progressTracker =
+      InnerImage()->GetProgressTracker();
+    if (InnerImage()->HasError()) {
+      // If there's a problem with the inner image we'll let it handle
+      // everything.
+      mShouldClip.emplace(false);
+    } else if (mSVGViewportSize && !mSVGViewportSize->IsEmpty()) {
+      // Clamp the clipping region to the size of the SVG viewport.
+      nsIntRect svgViewportRect(nsIntPoint(0,0), *mSVGViewportSize);
+
+      mClip = mClip.Intersect(svgViewportRect);
+
+      // If the clipping region is the same size as the SVG viewport size
+      // we don't have to do anything.
+      mShouldClip.emplace(!mClip.IsEqualInterior(svgViewportRect));
+    } else if (NS_SUCCEEDED(InnerImage()->GetWidth(&width)) && width > 0 &&
+               NS_SUCCEEDED(InnerImage()->GetHeight(&height)) && height > 0) {
+      // Clamp the clipping region to the size of the underlying image.
+      mClip = mClip.Intersect(nsIntRect(0, 0, width, height));
+
+      // If the clipping region is the same size as the underlying image we
+      // don't have to do anything.
+      mShouldClip.emplace(!mClip.IsEqualInterior(nsIntRect(0, 0, width,
+                                                           height)));
+    } else if (progressTracker &&
+               !(progressTracker->GetProgress() & FLAG_LOAD_COMPLETE)) {
+      // The image just hasn't finished loading yet. We don't yet know whether
+      // clipping with be needed or not for now. Just return without memorizing
+      // anything.
+      return false;
+    } else {
+      // We have a fully loaded image without a clearly defined width and
+      // height. This can happen with SVG images.
+      mShouldClip.emplace(false);
+    }
+  }
+
+  MOZ_ASSERT(mShouldClip.isSome(), "Should have computed a result");
+  return *mShouldClip;
+}
+
+NS_IMPL_ISUPPORTS_INHERITED0(ClippedImage, ImageWrapper)
+
+NS_IMETHODIMP
+ClippedImage::GetWidth(int32_t* aWidth)
+{
+  if (!ShouldClip()) {
+    return InnerImage()->GetWidth(aWidth);
+  }
+
+  *aWidth = mClip.width;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ClippedImage::GetHeight(int32_t* aHeight)
+{
+  if (!ShouldClip()) {
+    return InnerImage()->GetHeight(aHeight);
+  }
+
+  *aHeight = mClip.height;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ClippedImage::GetIntrinsicSize(nsSize* aSize)
+{
+  if (!ShouldClip()) {
+    return InnerImage()->GetIntrinsicSize(aSize);
+  }
+
+  *aSize = nsSize(mClip.width, mClip.height);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ClippedImage::GetIntrinsicRatio(nsSize* aRatio)
+{
+  if (!ShouldClip()) {
+    return InnerImage()->GetIntrinsicRatio(aRatio);
+  }
+
+  *aRatio = nsSize(mClip.width, mClip.height);
+  return NS_OK;
+}
+
+NS_IMETHODIMP_(already_AddRefed<SourceSurface>)
+ClippedImage::GetFrame(uint32_t aWhichFrame,
+                       uint32_t aFlags)
+{
+  DrawResult result;
+  RefPtr<SourceSurface> surface;
+  Tie(result, surface) = GetFrameInternal(mClip.Size(), Nothing(), aWhichFrame, aFlags);
+  return surface.forget();
+}
+
+NS_IMETHODIMP_(already_AddRefed<SourceSurface>)
+ClippedImage::GetFrameAtSize(const IntSize& aSize,
+                             uint32_t aWhichFrame,
+                             uint32_t aFlags)
+{
+  // XXX(seth): It'd be nice to support downscale-during-decode for this case,
+  // but right now we just fall back to the intrinsic size.
+  return GetFrame(aWhichFrame, aFlags);
+}
+
+Pair<DrawResult, RefPtr<SourceSurface>>
+ClippedImage::GetFrameInternal(const nsIntSize& aSize,
+                               const Maybe<SVGImageContext>& aSVGContext,
+                               uint32_t aWhichFrame,
+                               uint32_t aFlags)
+{
+  if (!ShouldClip()) {
+    RefPtr<SourceSurface> surface = InnerImage()->GetFrame(aWhichFrame, aFlags);
+    return MakePair(surface ? DrawResult::SUCCESS : DrawResult::NOT_READY,
+                    Move(surface));
+  }
+
+  float frameToDraw = InnerImage()->GetFrameIndex(aWhichFrame);
+  if (!mCachedSurface ||
+      !mCachedSurface->Matches(aSize, aSVGContext, frameToDraw, aFlags) ||
+      mCachedSurface->NeedsRedraw()) {
+    // Create a surface to draw into.
+    RefPtr<DrawTarget> target = gfxPlatform::GetPlatform()->
+      CreateOffscreenContentDrawTarget(IntSize(aSize.width, aSize.height),
+                                       SurfaceFormat::B8G8R8A8);
+    if (!target || !target->IsValid()) {
+      NS_ERROR("Could not create a DrawTarget");
+      return MakePair(DrawResult::TEMPORARY_ERROR, RefPtr<SourceSurface>());
+    }
+
+    RefPtr<gfxContext> ctx = gfxContext::CreateOrNull(target);
+    MOZ_ASSERT(ctx); // already checked the draw target above
+
+    // Create our callback.
+    RefPtr<DrawSingleTileCallback> drawTileCallback =
+      new DrawSingleTileCallback(this, aSize, aSVGContext, aWhichFrame, aFlags);
+    RefPtr<gfxDrawable> drawable =
+      new gfxCallbackDrawable(drawTileCallback, aSize);
+
+    // Actually draw. The callback will end up invoking DrawSingleTile.
+    gfxUtils::DrawPixelSnapped(ctx, drawable, aSize,
+                               ImageRegion::Create(aSize),
+                               SurfaceFormat::B8G8R8A8,
+                               SamplingFilter::LINEAR,
+                               imgIContainer::FLAG_CLAMP);
+
+    // Cache the resulting surface.
+    mCachedSurface =
+      MakeUnique<ClippedImageCachedSurface>(target->Snapshot(), aSize, aSVGContext,
+                                            frameToDraw, aFlags,
+                                            drawTileCallback->GetDrawResult());
+  }
+
+  MOZ_ASSERT(mCachedSurface, "Should have a cached surface now");
+  RefPtr<SourceSurface> surface = mCachedSurface->Surface();
+  return MakePair(mCachedSurface->GetDrawResult(), Move(surface));
+}
+
+NS_IMETHODIMP_(bool)
+ClippedImage::IsImageContainerAvailable(LayerManager* aManager, uint32_t aFlags)
+{
+  if (!ShouldClip()) {
+    return InnerImage()->IsImageContainerAvailable(aManager, aFlags);
+  }
+  return false;
+}
+
+NS_IMETHODIMP_(already_AddRefed<ImageContainer>)
+ClippedImage::GetImageContainer(LayerManager* aManager, uint32_t aFlags)
+{
+  // XXX(seth): We currently don't have a way of clipping the result of
+  // GetImageContainer. We work around this by always returning null, but if it
+  // ever turns out that ClippedImage is widely used on codepaths that can
+  // actually benefit from GetImageContainer, it would be a good idea to fix
+  // that method for performance reasons.
+
+  if (!ShouldClip()) {
+    return InnerImage()->GetImageContainer(aManager, aFlags);
+  }
+
+  return nullptr;
+}
+
+static bool
+MustCreateSurface(gfxContext* aContext,
+                  const nsIntSize& aSize,
+                  const ImageRegion& aRegion,
+                  const uint32_t aFlags)
+{
+  gfxRect imageRect(0, 0, aSize.width, aSize.height);
+  bool willTile = !imageRect.Contains(aRegion.Rect()) &&
+                  !(aFlags & imgIContainer::FLAG_CLAMP);
+  bool willResample = aContext->CurrentMatrix().HasNonIntegerTranslation() &&
+                      (willTile || !aRegion.RestrictionContains(imageRect));
+  return willTile || willResample;
+}
+
+NS_IMETHODIMP_(DrawResult)
+ClippedImage::Draw(gfxContext* aContext,
+                   const nsIntSize& aSize,
+                   const ImageRegion& aRegion,
+                   uint32_t aWhichFrame,
+                   SamplingFilter aSamplingFilter,
+                   const Maybe<SVGImageContext>& aSVGContext,
+                   uint32_t aFlags)
+{
+  if (!ShouldClip()) {
+    return InnerImage()->Draw(aContext, aSize, aRegion, aWhichFrame,
+                              aSamplingFilter, aSVGContext, aFlags);
+  }
+
+  // Check for tiling. If we need to tile then we need to create a
+  // gfxCallbackDrawable to handle drawing for us.
+  if (MustCreateSurface(aContext, aSize, aRegion, aFlags)) {
+    // Create a temporary surface containing a single tile of this image.
+    // GetFrame will call DrawSingleTile internally.
+    DrawResult result;
+    RefPtr<SourceSurface> surface;
+    Tie(result, surface) =
+      GetFrameInternal(aSize, aSVGContext, aWhichFrame, aFlags);
+    if (!surface) {
+      MOZ_ASSERT(result != DrawResult::SUCCESS);
+      return result;
+    }
+
+    // Create a drawable from that surface.
+    RefPtr<gfxSurfaceDrawable> drawable =
+      new gfxSurfaceDrawable(surface, aSize);
+
+    // Draw.
+    gfxUtils::DrawPixelSnapped(aContext, drawable, aSize, aRegion,
+                               SurfaceFormat::B8G8R8A8, aSamplingFilter);
+
+    return result;
+  }
+
+  return DrawSingleTile(aContext, aSize, aRegion, aWhichFrame,
+                        aSamplingFilter, aSVGContext, aFlags);
+}
+
+DrawResult
+ClippedImage::DrawSingleTile(gfxContext* aContext,
+                             const nsIntSize& aSize,
+                             const ImageRegion& aRegion,
+                             uint32_t aWhichFrame,
+                             SamplingFilter aSamplingFilter,
+                             const Maybe<SVGImageContext>& aSVGContext,
+                             uint32_t aFlags)
+{
+  MOZ_ASSERT(!MustCreateSurface(aContext, aSize, aRegion, aFlags),
+             "Shouldn't need to create a surface");
+
+  gfxRect clip(mClip.x, mClip.y, mClip.width, mClip.height);
+  nsIntSize size(aSize), innerSize(aSize);
+  bool needScale = false;
+  if (mSVGViewportSize && !mSVGViewportSize->IsEmpty()) {
+    innerSize = *mSVGViewportSize;
+    needScale = true;
+  } else if (NS_SUCCEEDED(InnerImage()->GetWidth(&innerSize.width)) &&
+             NS_SUCCEEDED(InnerImage()->GetHeight(&innerSize.height))) {
+    needScale = true;
+  } else {
+    MOZ_ASSERT_UNREACHABLE(
+               "If ShouldClip() led us to draw then we should never get here");
+  }
+
+  if (needScale) {
+    double scaleX = aSize.width / clip.width;
+    double scaleY = aSize.height / clip.height;
+
+    // Map the clip and size to the scale requested by the caller.
+    clip.Scale(scaleX, scaleY);
+    size = innerSize;
+    size.Scale(scaleX, scaleY);
+  }
+
+  // We restrict our drawing to only the clipping region, and translate so that
+  // the clipping region is placed at the position the caller expects.
+  ImageRegion region(aRegion);
+  region.MoveBy(clip.x, clip.y);
+  region = region.Intersect(clip);
+
+  gfxContextMatrixAutoSaveRestore saveMatrix(aContext);
+  aContext->Multiply(gfxMatrix::Translation(-clip.x, -clip.y));
+
+  auto unclipViewport = [&](const SVGImageContext& aOldContext) {
+    // Map the viewport to the inner image. Note that we don't take the aSize
+    // parameter of imgIContainer::Draw into account, just the clipping region.
+    // The size in pixels at which the output will ultimately be drawn is
+    // irrelevant here since the purpose of the SVG viewport size is to
+    // determine what *region* of the SVG document will be drawn.
+    CSSIntSize vSize(aOldContext.GetViewportSize());
+    vSize.width = ceil(vSize.width * double(innerSize.width) / mClip.width);
+    vSize.height =
+      ceil(vSize.height * double(innerSize.height) / mClip.height);
+
+    return SVGImageContext(vSize,
+                           aOldContext.GetPreserveAspectRatio());
+  };
+
+  return InnerImage()->Draw(aContext, size, region,
+                            aWhichFrame, aSamplingFilter,
+                            aSVGContext.map(unclipViewport),
+                            aFlags);
+}
+
+NS_IMETHODIMP
+ClippedImage::RequestDiscard()
+{
+  // We're very aggressive about discarding.
+  mCachedSurface = nullptr;
+
+  return InnerImage()->RequestDiscard();
+}
+
+NS_IMETHODIMP_(Orientation)
+ClippedImage::GetOrientation()
+{
+  // XXX(seth): This should not actually be here; this is just to work around a
+  // what appears to be a bug in MSVC's linker.
+  return InnerImage()->GetOrientation();
+}
+
+nsIntSize
+ClippedImage::OptimalImageSizeForDest(const gfxSize& aDest,
+                                      uint32_t aWhichFrame,
+                                      SamplingFilter aSamplingFilter,
+                                      uint32_t aFlags)
+{
+  if (!ShouldClip()) {
+    return InnerImage()->OptimalImageSizeForDest(aDest, aWhichFrame,
+                                                 aSamplingFilter, aFlags);
+  }
+
+  int32_t imgWidth, imgHeight;
+  bool needScale = false;
+  bool forceUniformScaling = false;
+  if (mSVGViewportSize && !mSVGViewportSize->IsEmpty()) {
+    imgWidth = mSVGViewportSize->width;
+    imgHeight = mSVGViewportSize->height;
+    needScale = true;
+    forceUniformScaling = (aFlags & imgIContainer::FLAG_FORCE_UNIFORM_SCALING);
+  } else if (NS_SUCCEEDED(InnerImage()->GetWidth(&imgWidth)) &&
+             NS_SUCCEEDED(InnerImage()->GetHeight(&imgHeight))) {
+    needScale = true;
+  }
+
+  if (needScale) {
+    // To avoid ugly sampling artifacts, ClippedImage needs the image size to
+    // be chosen such that the clipping region lies on pixel boundaries.
+
+    // First, we select a scale that's good for ClippedImage. An integer
+    // multiple of the size of the clipping region is always fine.
+    IntSize scale = IntSize::Ceil(aDest.width / mClip.width,
+                                  aDest.height / mClip.height);
+
+    if (forceUniformScaling) {
+      scale.width = scale.height = max(scale.height, scale.width);
+    }
+
+    // Determine the size we'd prefer to render the inner image at, and ask the
+    // inner image what size we should actually use.
+    gfxSize desiredSize(imgWidth * scale.width, imgHeight * scale.height);
+    nsIntSize innerDesiredSize =
+      InnerImage()->OptimalImageSizeForDest(desiredSize, aWhichFrame,
+                                            aSamplingFilter, aFlags);
+
+    // To get our final result, we take the inner image's desired size and
+    // determine how large the clipped region would be at that scale. (Again, we
+    // ensure an integer multiple of the size of the clipping region.)
+    IntSize finalScale = IntSize::Ceil(double(innerDesiredSize.width) / imgWidth,
+                                       double(innerDesiredSize.height) / imgHeight);
+    return mClip.Size() * finalScale;
+  }
+
+  MOZ_ASSERT(false,
+             "If ShouldClip() led us to draw then we should never get here");
+  return InnerImage()->OptimalImageSizeForDest(aDest, aWhichFrame,
+                                               aSamplingFilter, aFlags);
+}
+
+NS_IMETHODIMP_(nsIntRect)
+ClippedImage::GetImageSpaceInvalidationRect(const nsIntRect& aRect)
+{
+  if (!ShouldClip()) {
+    return InnerImage()->GetImageSpaceInvalidationRect(aRect);
+  }
+
+  nsIntRect rect(InnerImage()->GetImageSpaceInvalidationRect(aRect));
+  rect = rect.Intersect(mClip);
+  rect.MoveBy(-mClip.x, -mClip.y);
+  return rect;
+}
+
+} // namespace image
+} // namespace mozilla