Eliminate copies of encoded image data

third_party/WebKit/Source/platform/image-decoders/bmp/BMPImageDecoder.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 28 matching lines @@
 // "sizeof(BMPImageDecoder::BitmapFileHeader)" since we omit some fields and
 // don't pack).
 static const size_t sizeOfFileHeader = 14;
 
 BMPImageDecoder::BMPImageDecoder(AlphaOption alphaOption, GammaAndColorProfileOption colorOptions, size_t maxDecodedBytes)
     : ImageDecoder(alphaOption, colorOptions, maxDecodedBytes)
     , m_decodedOffset(0)
 {
 }
 
-void BMPImageDecoder::onSetData(SharedBuffer* data)
+void BMPImageDecoder::onSetData(SegmentReader* data)
 {
     if (m_reader)
         m_reader->setData(data);
 }
 
 bool BMPImageDecoder::setFailed()
 {
     m_reader.clear();
     return ImageDecoder::setFailed();
 }
@@ skipping 55 matching lines @@
         POINTER = 0x5054,  // "PT"
         COLORICON = 0x4349,  // "CI"
         COLORPOINTER = 0x4350,  // "CP"
         BITMAPARRAY = 0x4241,  // "BA"
         */
     };
     return (fileType == BMAP) || setFailed();
 }
 
 } // namespace blink