Don't recreate SkImages for high-res (GIF, WEBP...) animations.

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

 /*
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 89 matching lines @@
 BitmapImage::~BitmapImage()
 {
     stopAnimation();
 }
 
 bool BitmapImage::currentFrameHasSingleSecurityOrigin() const
 {
     return true;
 }
 
-void BitmapImage::destroyDecodedData(bool destroyAll)
+void BitmapImage::destroyDecodedData()
 {
     for (size_t i = 0; i < m_frames.size(); ++i) {
         // The underlying frame isn't actually changing (we're just trying to
         // save the memory for the framebuffer data), so we don't need to clear
         // the metadata.
         m_frames[i].clear(false);
     }
 
-    size_t frameBytesCleared = m_source.clearCacheExceptFrame(destroyAll ? kNotFound : m_currentFrame);
+    size_t frameBytesCleared = m_source.clearCacheExceptFrame(kNotFound);
     notifyMemoryChanged(-safeCast<int>(frameBytesCleared));
 }
 
-void BitmapImage::destroyDecodedDataIfNecessary()
-{
-    // Animated images >5MB are considered large enough that we'll only hang on
-    // to one frame at a time.
-    static const size_t cLargeAnimationCutoff = 5242880;
-    size_t allFrameBytes = 0;
-    for (size_t i = 0; i < m_frames.size(); ++i)
-        allFrameBytes += m_frames[i].m_frameBytes;
-
-    if (allFrameBytes > cLargeAnimationCutoff) {
-        destroyDecodedData(false);
-    }
-}
-
 void BitmapImage::notifyMemoryChanged(int delta)
 {
     if (delta && getImageObserver())
         getImageObserver()->decodedSizeChanged(this, delta);
 }
 
 int BitmapImage::totalFrameBytes()
 {
     const size_t numFrames = frameCount();
     size_t totalBytes = 0;
@@ skipping 417 matching lines @@
     m_frameTimer.clear();
 }
 
 void BitmapImage::resetAnimation()
 {
     stopAnimation();
     m_currentFrame = 0;
     m_repetitionsComplete = 0;
     m_desiredFrameStartTime = 0;
     m_animationFinished = false;
-
-    // For extremely large animations, when the animation is reset, we just throw everything away.
-    destroyDecodedDataIfNecessary();
 }
 
 bool BitmapImage::maybeAnimated()
 {
     if (m_animationFinished)
         return false;
     if (frameCount() > 1)
         return true;
 
     return m_source.repetitionCount() != cAnimationNone;
@@ skipping 37 matching lines @@
         // because it is 0 (see comments on its declaration in ImageAnimation.h).
         if ((repetitionCount(true) != cAnimationLoopInfinite && m_repetitionsComplete > m_repetitionCount)
             || (m_animationPolicy == ImageAnimationPolicyAnimateOnce && m_repetitionsComplete > 0)) {
             m_animationFinished = true;
             m_desiredFrameStartTime = 0;
             --m_currentFrame;
             advancedAnimation = false;
         } else
             m_currentFrame = 0;
     }
-    destroyDecodedDataIfNecessary();
 
     // We need to draw this frame if we advanced to it while not skipping, or if
     // while trying to skip frames we hit the last frame and thus had to stop.
     if (skippingFrames != advancedAnimation)
         getImageObserver()->animationAdvanced(this);
     return advancedAnimation;
 }
 
 } // namespace blink