Eliminate copies of encoded image data

third_party/WebKit/Source/platform/image-decoders/bmp/BMPImageDecoderTest.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/image-decoders/bmp/BMPImageDecoder.h"
 
 #include "platform/SharedBuffer.h"
 #include "platform/image-decoders/ImageDecoderTestHelpers.h"
+#include "platform/image-decoders/SharedBufferSegmentReader.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 
 namespace {
 
 PassOwnPtr<ImageDecoder> createDecoder()
 {
     return adoptPtr(new BMPImageDecoder(ImageDecoder::AlphaNotPremultiplied, ImageDecoder::GammaAndColorProfileApplied, ImageDecoder::noDecodedImageByteLimit));
 }
 
 } // anonymous namespace
 
 TEST(BMPImageDecoderTest, isSizeAvailable)
 {
     const char* bmpFile = "/LayoutTests/fast/images/resources/lenna.bmp"; // 256x256
     RefPtr<SharedBuffer> data = readFile(bmpFile);
     ASSERT_TRUE(data.get());
 
     OwnPtr<ImageDecoder> decoder = createDecoder();
-    decoder->setData(data.get(), true);
+    RefPtr<SharedBufferSegmentReader> segmentReader = adoptRef(new SharedBufferSegmentReader(data));
+    decoder->setData(segmentReader.get(), true);
     EXPECT_TRUE(decoder->isSizeAvailable());
     EXPECT_EQ(256, decoder->size().width());
     EXPECT_EQ(256, decoder->size().height());
 }
 
 TEST(BMPImageDecoderTest, parseAndDecode)
 {
     const char* bmpFile = "/LayoutTests/fast/images/resources/lenna.bmp"; // 256x256
     RefPtr<SharedBuffer> data = readFile(bmpFile);
     ASSERT_TRUE(data.get());
 
     OwnPtr<ImageDecoder> decoder = createDecoder();
-    decoder->setData(data.get(), true);
+    RefPtr<SharedBufferSegmentReader> segmentReader = adoptRef(new SharedBufferSegmentReader(data));
+    decoder->setData(segmentReader.get(), true);
 
     ImageFrame* frame = decoder->frameBufferAtIndex(0);
     ASSERT_TRUE(frame);
     EXPECT_EQ(ImageFrame::FrameComplete, frame->status());
     EXPECT_EQ(256, frame->getSkBitmap().width());
     EXPECT_EQ(256, frame->getSkBitmap().height());
     EXPECT_FALSE(decoder->failed());
 }
 
 // Test if a BMP decoder returns a proper error while decoding an empty image.
 TEST(BMPImageDecoderTest, emptyImage)
 {
     const char* bmpFile = "/LayoutTests/fast/images/resources/0x0.bmp"; // 0x0
     RefPtr<SharedBuffer> data = readFile(bmpFile);
     ASSERT_TRUE(data.get());
 
     OwnPtr<ImageDecoder> decoder = createDecoder();
-    decoder->setData(data.get(), true);
+    RefPtr<SharedBufferSegmentReader> segmentReader = adoptRef(new SharedBufferSegmentReader(data));
+    decoder->setData(segmentReader.get(), true);
 
     ImageFrame* frame = decoder->frameBufferAtIndex(0);
     ASSERT_TRUE(frame);
     EXPECT_EQ(ImageFrame::FrameEmpty, frame->status());
     EXPECT_TRUE(decoder->failed());
 }
 
 // This test verifies that calling SharedBuffer::mergeSegmentsIntoBuffer() does
 // not break BMP decoding at a critical point: in between a call to decode the
 // size (when BMPImageDecoder stops while it may still have input data to
 // read) and a call to do a full decode.
 TEST(BMPImageDecoderTest, mergeBuffer)
 {
     const char* bmpFile = "/LayoutTests/fast/images/resources/lenna.bmp";
     testMergeBuffer(&createDecoder, bmpFile);
 }
 
 } // namespace blink