High CPU and increased memory usage fix for high-res (GIF, WEBP...) animations.

third_party/WebKit/Source/platform/graphics/BitmapImageTest.cpp

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 59 matching lines @@
     BitmapImageTest(bool enableDeferredDecoding) : m_enableDeferredDecoding(enableDeferredDecoding) { }
 
     static PassRefPtr<SharedBuffer> readFile(const char* fileName)
     {
         String filePath = testing::blinkRootDir();
         filePath.append(fileName);
         return testing::readFromFile(filePath);
     }
 
     // Accessors to BitmapImage's protected methods.
-    void destroyDecodedData(bool destroyAll) { m_image->destroyDecodedData(destroyAll); }
+    void destroyDecodedData() { m_image->destroyDecodedData(); }
     size_t frameCount() { return m_image->frameCount(); }
-    void frameAtIndex(size_t index)
+    PassRefPtr<SkImage> frameAtIndex(size_t index)
     {
-        m_image->frameAtIndex(index);
+        return m_image->frameAtIndex(index);
     }
     void setCurrentFrame(size_t frame) { m_image->m_currentFrame = frame; }
     size_t frameDecodedSize(size_t frame) { return m_image->m_frames[frame].m_frameBytes; }
     size_t decodedFramesCount() const { return m_image->m_frames.size(); }
 
     void setFirstFrameNotComplete() { m_image->m_frames[0].m_isComplete = false; }
 
     void loadImage(const char* fileName, bool loadAllFrames = true)
     {
         RefPtr<SharedBuffer> imageData = readFile(fileName);
@@ skipping 36 matching lines @@
     int animationFinished()
     {
         return m_image->m_animationFinished;
     }
 
     PassRefPtr<Image> imageForDefaultFrame()
     {
         return m_image->imageForDefaultFrame();
     }
 
+    int lastDecodedSizeChange()
+    {
+        return m_imageObserver->m_lastDecodedSizeChangedDelta;
+    }
+
 protected:
     void SetUp() override
     {
         DeferredImageDecoder::setEnabled(m_enableDeferredDecoding);
         m_imageObserver = new FakeImageObserver;
         m_image = BitmapImage::create(m_imageObserver.get());
     }
 
     Persistent<FakeImageObserver> m_imageObserver;
     RefPtr<BitmapImage> m_image;
 
 private:
     bool m_enableDeferredDecoding;
 };
 
-TEST_F(BitmapImageTest, destroyDecodedDataExceptCurrentFrame)
-{
-    loadImage("/LayoutTests/fast/images/resources/animated-10color.gif");
-    size_t totalSize = decodedSize();
-    size_t frame = frameCount() / 2;
-    setCurrentFrame(frame);
-    size_t size = frameDecodedSize(frame);
-    destroyDecodedData(false);
-    EXPECT_LT(m_imageObserver->m_lastDecodedSizeChangedDelta, 0);
-    EXPECT_GE(m_imageObserver->m_lastDecodedSizeChangedDelta, -static_cast<int>(totalSize - size));
-}
-
-TEST_F(BitmapImageTest, destroyAllDecodedData)
+TEST_F(BitmapImageTest, destroyDecodedData)
 {
     loadImage("/LayoutTests/fast/images/resources/animated-10color.gif");
     size_t totalSize = decodedSize();
     EXPECT_GT(totalSize, 0u);
-    destroyDecodedData(true);
-    EXPECT_EQ(-static_cast<int>(totalSize), m_imageObserver->m_lastDecodedSizeChangedDelta);
+    destroyDecodedData();
+    EXPECT_EQ(-static_cast<int>(totalSize), lastDecodedSizeChange());
     EXPECT_EQ(0u, decodedSize());
 }
 
 TEST_F(BitmapImageTest, maybeAnimated)
 {
     loadImage("/LayoutTests/fast/images/resources/gif-loop-count.gif");
     for (size_t i = 0; i < frameCount(); ++i) {
         EXPECT_TRUE(m_image->maybeAnimated());
         advanceAnimation();
     }
@@ skipping 81 matching lines @@
 }
 
 TEST_F(BitmapImageTest, correctDecodedDataSize)
 {
     // When requesting a frame of a multi-frame GIF causes another frame to be
     // decoded as well, both frames' sizes should be reported by the source and
     // thus included in the decoded size changed notification.
     loadImage("/LayoutTests/fast/images/resources/anim_none.gif", false);
     frameAtIndex(1);
     int frameSize = static_cast<int>(m_image->size().area() * sizeof(ImageFrame::PixelData));
-    EXPECT_EQ(frameSize * 2, m_imageObserver->m_lastDecodedSizeChangedDelta);
-
-    // Trying to destroy all data except an undecoded frame should cause the
-    // decoder to seek backwards and preserve the most recent previous frame
-    // necessary to decode that undecoded frame, and destroy all other frames.
-    setCurrentFrame(2);
-    destroyDecodedData(false);
-    EXPECT_EQ(-frameSize, m_imageObserver->m_lastDecodedSizeChangedDelta);
+    EXPECT_EQ(frameSize * 2, lastDecodedSizeChange());
 }
 
 TEST_F(BitmapImageTest, recachingFrameAfterDataChanged)
 {
     loadImage("/LayoutTests/fast/images/resources/green.jpg");
     setFirstFrameNotComplete();
-    EXPECT_GT(m_imageObserver->m_lastDecodedSizeChangedDelta, 0);
+    EXPECT_GT(lastDecodedSizeChange(), 0);
     m_imageObserver->m_lastDecodedSizeChangedDelta = 0;
 
     // Calling dataChanged causes the cache to flush, but doesn't affect the
     // source's decoded frames. It shouldn't affect decoded size.
     m_image->dataChanged(true);
-    EXPECT_EQ(0, m_imageObserver->m_lastDecodedSizeChangedDelta);
+    EXPECT_EQ(0, lastDecodedSizeChange());
     // Recaching the first frame also shouldn't affect decoded size.
     m_image->imageForCurrentFrame();
-    EXPECT_EQ(0, m_imageObserver->m_lastDecodedSizeChangedDelta);
+    EXPECT_EQ(0, lastDecodedSizeChange());
 }
 
 class BitmapImageDeferredDecodingTest : public BitmapImageTest {
 public:
     BitmapImageDeferredDecodingTest() : BitmapImageTest(true) { }
 };
 
 TEST_F(BitmapImageDeferredDecodingTest, correctDecodedDataSize)
 {
     // When deferred decoding is enabled, requesting any one frame shouldn't
     // result in decoding any other frames.
     loadImage("/LayoutTests/fast/images/resources/anim_none.gif", false);
     frameAtIndex(1);
     int frameSize = static_cast<int>(m_image->size().area() * sizeof(ImageFrame::PixelData));
-    EXPECT_EQ(frameSize, m_imageObserver->m_lastDecodedSizeChangedDelta);
-    frameAtIndex(0);
-
-    // Trying to destroy all data except an undecoded frame should go ahead and
-    // destroy all other frames.
-    setCurrentFrame(2);
-    destroyDecodedData(false);
-    EXPECT_EQ(-frameSize * 2, m_imageObserver->m_lastDecodedSizeChangedDelta);
+    EXPECT_EQ(frameSize, lastDecodedSizeChange());
 }
 
 template <typename HistogramEnumType>
 struct HistogramTestParams {
     const char* filename;
     HistogramEnumType type;
 };
 
 template <typename HistogramEnumType>
 class BitmapHistogramTest
@@ skipping 42 matching lines @@
     {"/LayoutTests/fast/images/resources/exif-orientation-5-lu.jpg", OriginLeftTop},
     {"/LayoutTests/fast/images/resources/exif-orientation-6-ru.jpg", OriginRightTop},
     {"/LayoutTests/fast/images/resources/exif-orientation-7-rl.jpg", OriginRightBottom},
     {"/LayoutTests/fast/images/resources/exif-orientation-8-llo.jpg", OriginLeftBottom}
 };
 
 INSTANTIATE_TEST_CASE_P(DecodedImageOrientationHistogramTest, DecodedImageOrientationHistogramTest,
     ::testing::ValuesIn(kDecodedImageOrientationHistogramTestParams));
 
 } // namespace blink