Refactor ImageFrame::setSizeAndColorSpace()

third_party/WebKit/Source/platform/image-decoders/png/PNGImageDecoder.cpp

 /*
  * Copyright (C) 2006 Apple Computer, Inc.
  * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
  *
  * Portions are Copyright (C) 2001 mozilla.org
  *
  * Other contributors:
  *   Stuart Parmenter <stuart@mozilla.com>
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 194 matching lines @@
   // Initialize the framebuffer if needed.
   ImageFrame& buffer = m_frameBufferCache[0];
   if (buffer.getStatus() == ImageFrame::FrameEmpty) {
     png_structp png = m_reader->pngPtr();
     if (!buffer.setSizeAndColorSpace(size().width(), size().height(),
                                      colorSpaceForSkImages())) {
       longjmp(JMPBUF(png), 1);
       return;
     }
 
+    buffer.zeroFillPixelData();
+
     unsigned colorChannels = m_reader->hasAlpha() ? 4 : 3;
     if (PNG_INTERLACE_ADAM7 ==
         png_get_interlace_type(png, m_reader->infoPtr())) {
       m_reader->createInterlaceBuffer(colorChannels * size().width() *
                                       size().height());
       if (!m_reader->interlaceBuffer()) {
         longjmp(JMPBUF(png), 1);
         return;
       }
     }
@@ skipping 138 matching lines @@
   // has failed.
   if (!m_reader->decode(*m_data, onlySize) && isAllDataReceived())
     setFailed();
 
   // If decoding is done or failed, we don't need the PNGImageReader anymore.
   if (isComplete(this) || failed())
     m_reader.reset();
 }
 
 }  // namespace blink