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 52 matching lines @@
     static PassRefPtr<ImageFrameGenerator> create(const SkISize& fullSize, PassRefPtr<SharedBuffer> data, bool allDataReceived, bool isMultiFrame = false)
     {
         return adoptRef(new ImageFrameGenerator(fullSize, data, allDataReceived, isMultiFrame));
     }
 
     ~ImageFrameGenerator();
 
     // Decodes and scales the specified frame at |index|. The dimensions and output
     // format are given in SkImageInfo. 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);
 
     // Return our encoded image data. Caller takes ownership and must unref the data
     // according to the contract SkImageGenerator::refEncodedData.
     //
     // Returns null if image is not fully received.
     SkData* refEncodedData();
 
     const SkISize& getFullSize() const { return m_fullSize; }
 
     bool isMultiFrame() const { return m_isMultiFrame; }
 
     bool hasAlpha(size_t index);
 
     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:
     ImageFrameGenerator(const SkISize& fullSize, PassRefPtr<SharedBuffer>, bool allDataReceived, bool isMultiFrame);
 
     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 is referenced by this class and m_encodedData.
     // In case that ImageFrameGenerator get's deleted before m_encodedData,
     // m_encodedData would hold the reference to it (and underlying data).
     RefPtr<ThreadSafeDataTransport> m_data;
     bool m_isMultiFrame;
     bool m_decodeFailedAndEmpty;
     Vector<bool> m_hasAlpha;
@@ skipping 11 matching lines @@
 
     // Protect concurrent access to m_hasAlpha.
     Mutex m_alphaMutex;
 
     // Our encoded image data returned in refEncodedData.
     SkData* m_encodedData;
 
 #if COMPILER(MSVC)
     friend struct ::WTF::OwnedPtrDeleter<ExternalMemoryAllocator>;
 #endif
+    bool m_decoderCanDecodeToIndex8;
 };
 
 } // namespace blink
 
 #endif