Add animation support for WebP images

Source/core/platform/image-decoders/webp/WEBPImageDecoder.h

Index: Source/core/platform/image-decoders/webp/WEBPImageDecoder.h
diff --git a/Source/core/platform/image-decoders/webp/WEBPImageDecoder.h b/Source/core/platform/image-decoders/webp/WEBPImageDecoder.h
index 6cb469c18012ff63a1e96afe673c3d2800fc6427..4c212733964e77e22d715f77c719e44eb337aef3 100644
--- a/Source/core/platform/image-decoders/webp/WEBPImageDecoder.h
+++ b/Source/core/platform/image-decoders/webp/WEBPImageDecoder.h
@@ -32,9 +32,13 @@
 #include "core/platform/image-decoders/ImageDecoder.h"
 
 #include "webp/decode.h"
-#if USE(QCMSLIB) && (WEBP_DECODER_ABI_VERSION > 0x200)
+#if (WEBP_DECODER_ABI_VERSION > 0x200)
+#include "webp/demux.h"
+#define WEBP_ICC_ANIMATION_SUPPORT
+#if USE(QCMSLIB)
 #define QCMS_WEBP_COLOR_CORRECTION
 #endif
+#endif
 
 namespace WebCore {
 
@@ -45,29 +49,52 @@ public:
 
     virtual String filenameExtension() const { return "webp"; }
     virtual bool isSizeAvailable();
+    virtual size_t frameCount();
     virtual ImageFrame* frameBufferAtIndex(size_t index);
+#ifdef WEBP_ICC_ANIMATION_SUPPORT
+    virtual void setData(SharedBuffer* data, bool allDataReceived);
+    virtual int repetitionCount() const;
+    virtual bool frameIsCompleteAtIndex(size_t) const;
+    virtual float frameDurationAtIndex(size_t) const;
+    virtual void clearFrameBufferCache(size_t clearBeforeFrame);
+#endif
 
 private:
-    bool decode(bool onlySize);
+    bool decode(const uint8_t* dataBytes, size_t dataSize, bool onlySize, size_t frameIndex);
 
     WebPIDecoder* m_decoder;
     WebPDecBuffer m_decoderBuffer;
-    bool m_hasAlpha;
     int m_formatFlags;
 
 #ifdef QCMS_WEBP_COLOR_CORRECTION
     qcms_transform* colorTransform() const { return m_transform; }
     void createColorTransform(const char* data, size_t);
-    void readColorProfile(const uint8_t* data, size_t);
-    void applyColorProfile(const uint8_t* data, size_t, ImageFrame&);
+    void readColorProfile();
 
     bool m_haveReadProfile;
     qcms_transform* m_transform;
-    int m_decodedHeight;
+#endif
+
+#ifdef WEBP_ICC_ANIMATION_SUPPORT
+    bool updateDemuxer();
+    // Called to initialize the frame buffer at the given index based on
+    // the previous frame's disposal method. Returns true on success. On
+    // failure, marks the image as failed.
+    bool initFrameBuffer(const WebPIterator&, size_t frameIndex);
+    void applyPostProcessing(size_t frameIndex);
+
+    WebPDemuxer* m_demux;
+    WebPDemuxState m_demuxState;
+    bool m_haveAlreadyParsedThisData;
+    bool m_haveReadAnimationParameters;
+    int m_repetitionCount;
+    int m_decodedHeight; // Number of rows decoded and post-processed so far in the current frame.
 #else
-    void applyColorProfile(const uint8_t*, size_t, ImageFrame&) { };
+    void applyPostProcessing(size_t) { };
 #endif
+
     void clear();
+    void clearDecoder();
 };
 
 } // namespace WebCore