Eliminate copies of encoded image data

third_party/WebKit/Source/platform/image-decoders/ROBufferSegmentReader.h

Index: third_party/WebKit/Source/platform/image-decoders/ROBufferSegmentReader.h
diff --git a/third_party/WebKit/Source/platform/image-decoders/ROBufferSegmentReader.h b/third_party/WebKit/Source/platform/image-decoders/ROBufferSegmentReader.h
new file mode 100644
index 0000000000000000000000000000000000000000..e2aaa4836fe08c851d0a79395046dbaa13d86a6c
--- /dev/null
+++ b/third_party/WebKit/Source/platform/image-decoders/ROBufferSegmentReader.h
@@ -0,0 +1,33 @@
+// Copyright 2016 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.
+
+#ifndef ROBufferSegmentReader_h
+#define ROBufferSegmentReader_h
+
+#include "platform/image-decoders/SegmentReader.h"
+#include "skia/ext/refptr.h"

[f(malita), 2016/03/23 16:41:58]

Replace with wtf/RefPtr.h, wtf/PassRefPtr.h

[scroggo_chromium, 2016/03/24 13:59:46]

Done.

+#include "third_party/skia/src/core/SkRWBuffer.h"
+#include "wtf/Noncopyable.h"
+
+namespace blink {
+
+class ROBufferSegmentReader final : public SegmentReader {
+    WTF_MAKE_NONCOPYABLE(ROBufferSegmentReader);
+public:
+    ROBufferSegmentReader(const skia::RefPtr<SkROBuffer>&);

[f(malita), 2016/03/23 16:41:58]

PassRefPtr<SkROBuffer>

[scroggo_chromium, 2016/03/24 13:59:46]

Done.

+
+    size_t getSomeData(const char*& data, size_t position) const override;
+    size_t size() const override { return m_roBuffer ? m_roBuffer->size() : 0; }
+    PassRefPtr<SkData> getAsSkData() const override;
+
+private:
+    skia::RefPtr<const SkROBuffer> m_roBuffer;

[f(malita), 2016/03/23 16:41:58]

RefPtr<SkROBuffer>

[scroggo_chromium, 2016/03/24 13:59:46]

Done.

+    // Position of the first char in the current block of m_iter.
+    mutable size_t m_positionOfBlock;
+    mutable SkROBuffer::Iter m_iter;
+};
+
+} // namespace blink
+
+#endif // ROBufferSegmentReader_h