Eliminate copies of encoded image data

third_party/WebKit/Source/platform/exported/WebImage.cpp

Index: third_party/WebKit/Source/platform/exported/WebImage.cpp
diff --git a/third_party/WebKit/Source/platform/exported/WebImage.cpp b/third_party/WebKit/Source/platform/exported/WebImage.cpp
index bb14044c2946d29e25d81ee60d1637f7cbbb4a79..336fbc71f0af7671f40191b01d491060b1837ee7 100644
--- a/third_party/WebKit/Source/platform/exported/WebImage.cpp
+++ b/third_party/WebKit/Source/platform/exported/WebImage.cpp
@@ -33,6 +33,7 @@
 #include "platform/SharedBuffer.h"
 #include "platform/graphics/Image.h"
 #include "platform/image-decoders/ImageDecoder.h"
+#include "platform/image-decoders/SharedBufferSegmentReader.h"
 #include "public/platform/WebData.h"
 #include "public/platform/WebSize.h"
 #include "third_party/skia/include/core/SkImage.h"
@@ -47,11 +48,12 @@ namespace blink {
 WebImage WebImage::fromData(const WebData& data, const WebSize& desiredSize)
 {
     RefPtr<SharedBuffer> buffer = PassRefPtr<SharedBuffer>(data);
-    OwnPtr<ImageDecoder> decoder(ImageDecoder::create(*buffer.get(), ImageDecoder::AlphaPremultiplied, ImageDecoder::GammaAndColorProfileIgnored));
+    RefPtr<SharedBufferSegmentReader> segmentReader = adoptRef(new SharedBufferSegmentReader(buffer));
+    OwnPtr<ImageDecoder> decoder(ImageDecoder::create(*segmentReader.get(), ImageDecoder::AlphaPremultiplied, ImageDecoder::GammaAndColorProfileIgnored));
     if (!decoder)
         return WebImage();
 
-    decoder->setData(buffer.get(), true);
+    decoder->setData(segmentReader.get(), true);
     if (!decoder->isSizeAvailable())
         return WebImage();
 
@@ -91,11 +93,12 @@ WebVector<WebImage> WebImage::framesFromData(const WebData& data)
     const size_t maxFrameCount = 8;
 
     RefPtr<SharedBuffer> buffer = PassRefPtr<SharedBuffer>(data);
-    OwnPtr<ImageDecoder> decoder(ImageDecoder::create(*buffer.get(), ImageDecoder::AlphaPremultiplied, ImageDecoder::GammaAndColorProfileIgnored));
+    RefPtr<SharedBufferSegmentReader> segmentReader = adoptRef(new SharedBufferSegmentReader(buffer));
+    OwnPtr<ImageDecoder> decoder(ImageDecoder::create(*segmentReader.get(), ImageDecoder::AlphaPremultiplied, ImageDecoder::GammaAndColorProfileIgnored));
     if (!decoder)
         return WebVector<WebImage>();
 
-    decoder->setData(buffer.get(), true);
+    decoder->setData(segmentReader.get(), true);
     if (!decoder->isSizeAvailable())
         return WebVector<WebImage>();