Remove duplication of encoded image data

third_party/WebKit/Source/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.
  *
  * 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.
@@ skipping 28 matching lines @@
 
 ImageSource::~ImageSource()
 {
 }
 
 size_t ImageSource::clearCacheExceptFrame(size_t clearExceptFrame)
 {
     return m_decoder ? m_decoder->clearCacheExceptFrame(clearExceptFrame) : 0;
 }
 
+bool ImageSource::hasData() const
+{
+    return m_decoder ? m_decoder->hasData() : false;
+}
+
+PassRefPtr<SharedBuffer> ImageSource::data()
+{
+    return m_decoder->data();

[scroggo_chromium, 2016/06/20 19:00:43]

Shouldn't you check to make sure m_decoder is not NULL first? (Or is it required
that hasData() has already been called?)

[hajimehoshi, 2016/06/22 09:42:30]

Done.

+}
+
 void ImageSource::setData(SharedBuffer& data, bool allDataReceived)
 {
     // Create a decoder by sniffing the encoded data. If insufficient data bytes are available to
     // determine the encoded image type, no decoder is created.
     if (!m_decoder)
         m_decoder = DeferredImageDecoder::create(data, ImageDecoder::AlphaPremultiplied, ImageDecoder::GammaAndColorProfileApplied);
 
     if (m_decoder)
         m_decoder->setData(data, allDataReceived);
 }
@@ skipping 82 matching lines @@
 {
     return m_decoder && m_decoder->frameIsCompleteAtIndex(index);
 }
 
 size_t ImageSource::frameBytesAtIndex(size_t index) const
 {
     return m_decoder ? m_decoder->frameBytesAtIndex(index) : 0;
 }
 
 } // namespace blink