Add support for Animated PNG

third_party/WebKit/Source/platform/image-decoders/ImageDecoder.cpp

 /*
  * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Library General Public
  *  License as published by the Free Software Foundation; either
  *  version 2 of the License, or (at your option) any later version.
  *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 338 matching lines @@
 
   // If the frame is already initialized, return true.
   if (buffer->getStatus() != ImageFrame::FrameEmpty)
     return true;
 
   size_t requiredPreviousFrameIndex = buffer->requiredPreviousFrameIndex();
   if (requiredPreviousFrameIndex == kNotFound) {
     // This frame doesn't rely on any previous data.
     if (!buffer->setSizeAndColorSpace(size().width(), size().height(),
                                       colorSpaceForSkImages())) {
-      return setFailed();
+      return false;
     }
   } else {
     ImageFrame* const prevBuffer =
         &m_frameBufferCache[requiredPreviousFrameIndex];
     DCHECK(prevBuffer->getStatus() == ImageFrame::FrameComplete);
 
     // We try to reuse |prevBuffer| as starting state to avoid copying.
     // If canReusePreviousFrameBuffer returns false, we must copy the data since
     // |prevBuffer| is necessary to decode this or later frames. In that case,
     // copy the data instead.
     if ((!canReusePreviousFrameBuffer(frameIndex) ||
          !buffer->takeBitmapDataIfWritable(prevBuffer)) &&
         !buffer->copyBitmapData(*prevBuffer))
-      return setFailed();
+      return false;
 
     if (prevBuffer->getDisposalMethod() ==
         ImageFrame::DisposeOverwriteBgcolor) {
       // We want to clear the previous frame to transparent, without
       // affecting pixels in the image outside of the frame.
       const IntRect& prevRect = prevBuffer->originalFrameRect();
       DCHECK(!prevRect.contains(IntRect(IntPoint(), size())));
       buffer->zeroFillFrameRect(prevRect);
     }
   }
 
+  onInitFrameBuffer(frameIndex);
+
   // Update our status to be partially complete.
   buffer->setStatus(ImageFrame::FramePartial);
 
-  onInitFrameBuffer(frameIndex);
   return true;
 }
 
 void ImageDecoder::updateAggressivePurging(size_t index) {
   if (m_purgeAggressively)
     return;
 
   // We don't want to cache so much that we cause a memory issue.
   //
   // If we used a LRU cache we would fill it and then on next animation loop
@@ skipping 147 matching lines @@
 sk_sp<SkColorSpace> ImageDecoder::colorSpaceForSkImages() const {
   if (!m_colorBehavior.isTag())
     return nullptr;
 
   if (m_embeddedColorSpace)
     return m_embeddedColorSpace;
   return SkColorSpace::MakeSRGB();
 }
 
 }  // namespace blink