GIF decoding to Index8, unit tests and misusing unit test as benchmark

third_party/WebKit/Source/platform/graphics/ImageFrameGenerator.h

 /*
  * Copyright (C) 2012 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 50 matching lines @@
     }
 
     ImageFrameGenerator(const SkISize& fullSize, PassRefPtr<SharedBuffer>, bool allDataReceived, bool isMultiFrame);
     ~ImageFrameGenerator();
 
     // Decodes and scales the specified frame indicated by |index|. Dimensions
     // and output format are specified in |info|. Decoded pixels are written
     // into |pixels| with a stride of |rowBytes|.
     //
     // Returns true if decoding was successful.
-    bool decodeAndScale(const SkImageInfo&, size_t index, void* pixels, size_t rowBytes);
+    bool decodeAndScale(const SkImageInfo&, size_t index, void* pixels, size_t rowBytes, SkPMColor ctable[] = nullptr, int* ctableCount = nullptr);
 
     // Decodes YUV components directly into the provided memory planes.
     bool decodeToYUV(SkISize componentSizes[3], void* planes[3], size_t rowBytes[3]);
 
     void setData(PassRefPtr<SharedBuffer>, bool allDataReceived);
 
     // Creates a new SharedBuffer containing the data received so far.
     void copyData(RefPtr<SharedBuffer>*, bool* allDataReceived);
 
     SkISize getFullSize() const { return m_fullSize; }
 
     bool isMultiFrame() const { return m_isMultiFrame; }
 
     // FIXME: Return alpha state for each frame.
     bool hasAlpha(size_t);
 
     bool getYUVComponentSizes(SkISize componentSizes[3]);
 
+    // Specifies that there is decoder support, to optimize when to call canDecodeTo().
+    void setDecoderCanDecodeToIndex8(bool canIt) { m_decoderCanDecodeToIndex8 = canIt; }
+    bool canDecodeTo(size_t index, SkColorType outputType);
+
 private:
     class ExternalMemoryAllocator;
     friend class ImageFrameGeneratorTest;
     friend class DeferredImageDecoderTest;
     // For testing. |factory| will overwrite the default ImageDecoder creation logic if |factory->create()| returns non-zero.
     void setImageDecoderFactory(PassOwnPtr<ImageDecoderFactory> factory) { m_imageDecoderFactory = factory; }
 
     void setHasAlpha(size_t index, bool hasAlpha);
 
     // These methods are called while m_decodeMutex is locked.
-    SkBitmap tryToResumeDecode(const SkISize& scaledSize, size_t index);
+    SkBitmap tryToResumeDecode(const SkISize& scaledSize, size_t index, SkColorType outputColor);
 
     // Use the given decoder to decode. If a decoder is not given then try to create one.
     // Returns true if decoding was complete.
-    bool decode(size_t index, ImageDecoder**, SkBitmap*);
+    bool decode(size_t index, ImageDecoder**, SkBitmap*, SkColorType);
 
     SkISize m_fullSize;
     ThreadSafeDataTransport m_data;
     bool m_isMultiFrame;
     bool m_decodeFailedAndEmpty;
     Vector<bool> m_hasAlpha;
     int m_decodeCount;
     Vector<bool> m_frameComplete;
     size_t m_frameCount;
     OwnPtr<ExternalMemoryAllocator> m_externalAllocator;
 
     OwnPtr<ImageDecoderFactory> m_imageDecoderFactory;
 
     // Prevents multiple decode operations on the same data.
     Mutex m_decodeMutex;
 
     // Protect concurrent access to m_hasAlpha.
     Mutex m_alphaMutex;
+
+    bool m_decoderCanDecodeToIndex8;
 };
 
 } // namespace blink
 
 #endif