Decode GIF image frames on demand.

Source/core/platform/graphics/ImageSource.cpp

 /*
  * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp.toker@collabora.co.uk>
  * Copyright (C) 2008, Google Inc. All rights reserved.
  * Copyright (C) 2007-2009 Torch Mobile, Inc
  *
  * 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
@@ skipping 36 matching lines @@
     : m_alphaOption(alphaOption)
     , m_gammaAndColorProfileOption(gammaAndColorProfileOption)
 {
 }
 
 ImageSource::~ImageSource()
 {
     clear(true);
 }
 
-void ImageSource::clear(bool destroyAll, size_t clearBeforeFrame, SharedBuffer* data, bool allDataReceived)
+void ImageSource::clear(bool destroyAll, size_t clearExceptFrame, SharedBuffer* data, bool allDataReceived)
 {
     if (!destroyAll) {
         if (m_decoder)
-            m_decoder->clearFrameBufferCache(clearBeforeFrame);
+            m_decoder->clearFrameBufferCache(clearExceptFrame);
         return;
     }
 
     m_decoder.clear();
     if (data)
         setData(data, allDataReceived);
 }
 
 bool ImageSource::initialized() const
 {
@@ skipping 121 matching lines @@
     return m_decoder->frameBytesAtIndex(index);
 }
 
 void ImageSource::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
 {
     MemoryClassInfo info(memoryObjectInfo, this, PlatformMemoryTypes::Image);
     info.addMember(m_decoder, "decoder");
 }
 
 }