1 files changed, 148 insertions, 0 deletions
diff --git a/image/FrozenImage.cpp b/image/FrozenImage.cpp
new file mode 100644
index 0000000000..bb82aaedd6
--- /dev/null
+++ b/image/FrozenImage.cpp
@@ -0,0 +1,148 @@
+/* -*- 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 "FrozenImage.h"
+
+namespace mozilla {
+
+using namespace gfx;
+using layers::ImageContainer;
+
+namespace image {
+
+void FrozenImage::IncrementAnimationConsumers() {
+  // Do nothing. This will prevent animation from starting if there are no other
+  // instances of this image.
+}
+
+void FrozenImage::DecrementAnimationConsumers() {
+  // Do nothing.
+}
+
+NS_IMETHODIMP
+FrozenImage::GetAnimated(bool* aAnimated) {
+  bool dummy;
+  nsresult rv = InnerImage()->GetAnimated(&dummy);
+  if (NS_SUCCEEDED(rv)) {
+    *aAnimated = false;
+  }
+  return rv;
+}
+
+NS_IMETHODIMP_(already_AddRefed<SourceSurface>)
+FrozenImage::GetFrame(uint32_t aWhichFrame, uint32_t aFlags) {
+  return InnerImage()->GetFrame(FRAME_FIRST, aFlags);
+}
+
+NS_IMETHODIMP_(already_AddRefed<SourceSurface>)
+FrozenImage::GetFrameAtSize(const IntSize& aSize, uint32_t aWhichFrame,
+                            uint32_t aFlags) {
+  return InnerImage()->GetFrameAtSize(aSize, FRAME_FIRST, aFlags);
+}
+
+bool FrozenImage::IsNonAnimated() const {
+  // We usually don't create frozen images for non-animated images, but it might
+  // happen if we don't have enough data at the time of the creation to
+  // determine whether the image is actually animated.
+  bool animated = false;
+  return NS_SUCCEEDED(InnerImage()->GetAnimated(&animated)) && !animated;
+}
+
+NS_IMETHODIMP_(bool)
+FrozenImage::IsImageContainerAvailable(WindowRenderer* aRenderer,
+                                       uint32_t aFlags) {
+  if (IsNonAnimated()) {
+    return InnerImage()->IsImageContainerAvailable(aRenderer, aFlags);
+  }
+  return false;
+}
+
+NS_IMETHODIMP_(ImgDrawResult)
+FrozenImage::GetImageProvider(WindowRenderer* aRenderer,
+                              const gfx::IntSize& aSize,
+                              const SVGImageContext& aSVGContext,
+                              const Maybe<ImageIntRegion>& aRegion,
+                              uint32_t aFlags,
+                              WebRenderImageProvider** aProvider) {
+  if (IsNonAnimated()) {
+    return InnerImage()->GetImageProvider(aRenderer, aSize, aSVGContext,
+                                          aRegion, aFlags, aProvider);
+  }
+
+  // XXX(seth): GetImageContainer does not currently support anything but the
+  // current frame. We work around this by always returning null, but if it ever
+  // turns out that FrozenImage is widely used on codepaths that can actually
+  // benefit from GetImageContainer, it would be a good idea to fix that method
+  // for performance reasons.
+  return ImgDrawResult::NOT_SUPPORTED;
+}
+
+NS_IMETHODIMP_(ImgDrawResult)
+FrozenImage::Draw(gfxContext* aContext, const nsIntSize& aSize,
+                  const ImageRegion& aRegion,
+                  uint32_t /* aWhichFrame - ignored */,
+                  SamplingFilter aSamplingFilter,
+                  const SVGImageContext& aSVGContext, uint32_t aFlags,
+                  float aOpacity) {
+  return InnerImage()->Draw(aContext, aSize, aRegion, FRAME_FIRST,
+                            aSamplingFilter, aSVGContext, aFlags, aOpacity);
+}
+
+NS_IMETHODIMP
+FrozenImage::StartDecoding(uint32_t aFlags, uint32_t aWhichFrame) {
+  return InnerImage()->StartDecoding(aFlags, FRAME_FIRST);
+}
+
+bool FrozenImage::StartDecodingWithResult(uint32_t aFlags,
+                                          uint32_t aWhichFrame) {
+  return InnerImage()->StartDecodingWithResult(aFlags, FRAME_FIRST);
+}
+
+bool FrozenImage::HasDecodedPixels() {
+  return InnerImage()->HasDecodedPixels();
+}
+
+imgIContainer::DecodeResult FrozenImage::RequestDecodeWithResult(
+    uint32_t aFlags, uint32_t aWhichFrame) {
+  return InnerImage()->RequestDecodeWithResult(aFlags, FRAME_FIRST);
+}
+
+NS_IMETHODIMP
+FrozenImage::RequestDecodeForSize(const nsIntSize& aSize, uint32_t aFlags,
+                                  uint32_t aWhichFrame) {
+  return InnerImage()->RequestDecodeForSize(aSize, aFlags, FRAME_FIRST);
+}
+
+NS_IMETHODIMP_(void)
+FrozenImage::RequestRefresh(const TimeStamp& aTime) {
+  // Do nothing.
+}
+
+NS_IMETHODIMP
+FrozenImage::GetAnimationMode(uint16_t* aAnimationMode) {
+  *aAnimationMode = kNormalAnimMode;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+FrozenImage::SetAnimationMode(uint16_t aAnimationMode) {
+  // Do nothing.
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+FrozenImage::ResetAnimation() {
+  // Do nothing.
+  return NS_OK;
+}
+
+NS_IMETHODIMP_(float)
+FrozenImage::GetFrameIndex(uint32_t aWhichFrame) {
+  MOZ_ASSERT(aWhichFrame <= FRAME_MAX_VALUE, "Invalid argument");
+  return 0;
+}
+
+}  // namespace image
+}  // namespace mozilla