Eliminate copies of encoded image data

third_party/WebKit/Source/platform/image-decoders/FastSharedBufferReader.cpp

 /*
  * Copyright (C) 2015 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 14 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "platform/image-decoders/FastSharedBufferReader.h"
 
 namespace blink {
 
-FastSharedBufferReader::FastSharedBufferReader(PassRefPtr<SharedBuffer> data)
+FastSharedBufferReader::FastSharedBufferReader(PassRefPtr<SegmentReader> data)
     : m_data(data)
     , m_segment(0)
     , m_segmentLength(0)
     , m_dataPosition(0)
 {
 }
 
-void FastSharedBufferReader::setData(PassRefPtr<SharedBuffer> data)
+void FastSharedBufferReader::setData(PassRefPtr<SegmentReader> data)
 {
     if (data == m_data)
         return;
     m_data = data;
     clearCache();
 }
 
 void FastSharedBufferReader::clearCache()
 {
     m_segment = 0;
@@ skipping 35 matching lines @@
 }
 
 void FastSharedBufferReader::getSomeDataInternal(size_t dataPosition) const
 {
     m_dataPosition = dataPosition;
     m_segmentLength = m_data->getSomeData(m_segment, dataPosition);
     ASSERT(m_segmentLength);
 }
 
 } // namespace blink