Animated WebP: Optimize decoding in case of seeking

Source/core/platform/image-decoders/gif/GIFImageReader.h

 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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  * The contents of this file are subject to the Mozilla Public License Version
  * 1.1 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
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  * Software distributed under the License is distributed on an "AS IS" basis,
@@ skipping 210 matching lines @@
         m_width = width;
         m_height = height;
     }
     WebCore::IntRect frameRect() const { return WebCore::IntRect(m_xOffset, m_yOffset, m_width, m_height); }
     unsigned xOffset() const { return m_xOffset; }
     unsigned yOffset() const { return m_yOffset; }
     unsigned width() const { return m_width; }
     unsigned height() const { return m_height; }
     size_t transparentPixel() const { return m_transparentPixel; }
     void setTransparentPixel(size_t pixel) { m_transparentPixel = pixel; }
-    WebCore::ImageFrame::FrameDisposalMethod disposalMethod() const { return m_disposalMethod; }
-    void setDisposalMethod(WebCore::ImageFrame::FrameDisposalMethod method) { m_disposalMethod = method; }
+    WebCore::ImageFrame::DisposalMethod disposalMethod() const { return m_disposalMethod; }
+    void setDisposalMethod(WebCore::ImageFrame::DisposalMethod disposalMethod) { m_disposalMethod = disposalMethod; }
     unsigned delayTime() const { return m_delayTime; }
     void setDelayTime(unsigned delay) { m_delayTime = delay; }
     bool isComplete() const { return m_isComplete; }
     void setComplete() { m_isComplete = true; }
     bool isHeaderDefined() const { return m_isHeaderDefined; }
     void setHeaderDefined() { m_isHeaderDefined = true; }
     bool isDataSizeDefined() const { return m_isDataSizeDefined; }
     int dataSize() const { return m_dataSize; }
     void setDataSize(int size)
     {
         m_dataSize = size;
         m_isDataSizeDefined = true;
     }
     bool progressiveDisplay() const { return m_progressiveDisplay; }
     void setProgressiveDisplay(bool progressiveDisplay) { m_progressiveDisplay = progressiveDisplay; }
     bool interlaced() const { return m_interlaced; }
     void setInterlaced(bool interlaced) { m_interlaced = interlaced; }
 
     void clearDecodeState() { m_lzwContext.clear(); }
     const GIFColorMap& localColorMap() const { return m_localColorMap; }
     GIFColorMap& localColorMap() { return m_localColorMap; }
 
 private:
     int m_frameId;
     unsigned m_xOffset;
     unsigned m_yOffset; // With respect to "screen" origin.
     unsigned m_width;
     unsigned m_height;
     size_t m_transparentPixel; // Index of transparent pixel. Value is notFound if there is no transparent pixel.
-    WebCore::ImageFrame::FrameDisposalMethod m_disposalMethod; // Restore to background, leave in place, etc.
+    WebCore::ImageFrame::DisposalMethod m_disposalMethod; // Restore to background, leave in place, etc.
     int m_dataSize;
 
     bool m_progressiveDisplay; // If true, do Haeberli interlace hack.
     bool m_interlaced; // True, if scanlines arrive interlaced order.
 
     unsigned m_delayTime; // Display time, in milliseconds, for this image in a multi-image GIF.
 
     OwnPtr<GIFLZWContext> m_lzwContext;
     Vector<GIFLZWBlock> m_lzwBlocks; // LZW blocks for this frame.
     GIFColorMap m_localColorMap;
@@ skipping 85 matching lines @@
     GIFColorMap m_globalColorMap;
     int m_loopCount; // Netscape specific extension block to control the number of animation loops a GIF renders.
 
     Vector<OwnPtr<GIFFrameContext> > m_frames;
 
     RefPtr<WebCore::SharedBuffer> m_data;
     bool m_parseCompleted;
 };
 
 #endif