Eliminate copies of encoded image data

third_party/WebKit/Source/platform/image-decoders/ico/ICOImageDecoder.cpp

 /*
  * Copyright (c) 2008, 2009, 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 36 matching lines @@
     : ImageDecoder(alphaOption, colorOptions, maxDecodedBytes)
     , m_fastReader(nullptr)
     , m_decodedOffset(0)
 {
 }
 
 ICOImageDecoder::~ICOImageDecoder()
 {
 }
 
-void ICOImageDecoder::onSetData(SharedBuffer* data)
+void ICOImageDecoder::onSetData(SegmentReader* data)
 {
     m_fastReader.setData(data);
 
     for (BMPReaders::iterator i(m_bmpReaders.begin()); i != m_bmpReaders.end(); ++i) {
         if (*i)
             (*i)->setData(data);
     }
     for (size_t i = 0; i < m_pngDecoders.size(); ++i)
         setDataForPNGDecoderAtIndex(i);
 }
@@ skipping 230 matching lines @@
     ASSERT_WITH_SECURITY_IMPLICATION(index < m_dirEntries.size());
     const uint32_t imageOffset = m_dirEntries[index].m_imageOffset;
     if ((imageOffset > m_data->size()) || ((m_data->size() - imageOffset) < 4))
         return Unknown;
     char buffer[4];
     const char* data = m_fastReader.getConsecutiveData(imageOffset, 4, buffer);
     return strncmp(data, "\x89PNG", 4) ? BMP : PNG;
 }
 
 } // namespace blink