GIF Animations "clear from cache related glitch" fix

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

 /*
  * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) Research In Motion Limited 2009-2010. 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
@@ skipping 17 matching lines @@
 #define ImageDecoder_h
 
 #include "SkColorPriv.h"
 #include "platform/PlatformExport.h"
 #include "platform/SharedBuffer.h"
 #include "platform/graphics/ImageOrientation.h"
 #include "platform/image-decoders/ImageAnimation.h"
 #include "platform/image-decoders/ImageFrame.h"
 #include "public/platform/Platform.h"
 #include "wtf/Assertions.h"
+#include "wtf/HashSet.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Threading.h"
 #include "wtf/Vector.h"
 #include "wtf/text/WTFString.h"
 
 #if USE(QCMSLIB)
 #include "qcms.h"
 #endif
 
 typedef Vector<char> ColorProfile;
+typedef HashSet<size_t, WTF::IntHash<size_t>, WTF::UnsignedWithZeroKeyHashTraits<size_t>> SizeTHashSet;
 
 namespace blink {
 
 // ImagePlanes can be used to decode color components into provided buffers instead of using an ImageFrame.
 class PLATFORM_EXPORT ImagePlanes final {
     USING_FAST_MALLOC(ImagePlanes);
     WTF_MAKE_NONCOPYABLE(ImagePlanes);
 public:
     ImagePlanes();
     ImagePlanes(void* planes[3], size_t rowBytes[3]);
@@ skipping 268 matching lines @@
     // returns that number.
     virtual size_t decodeFrameCount() { return 1; }
 
     // Performs any additional setup of the requested frame after it has been
     // initially created, e.g. setting a duration or disposal method.
     virtual void initializeNewFrame(size_t) { }
 
     // Decodes the requested frame.
     virtual void decode(size_t) = 0;
 
+    // Clears decoded pixel data from all frames except the provided frames.
+    // Callers may pass WTF::kNotFound to clear all frames.
+    // Note: If |m_frameBufferCache| contains only one frame, it won't be cleared.
+    // Returns the number of bytes of frame data actually cleared.
+    size_t clearCacheExceptFrames(const SizeTHashSet&);
+
     RefPtr<SharedBuffer> m_data; // The encoded data.
     Vector<ImageFrame, 1> m_frameBufferCache;
     bool m_premultiplyAlpha;
     bool m_ignoreGammaAndColorProfile;
     ImageOrientation m_orientation;
 
     // The maximum amount of memory a decoded image should require. Ideally,
     // image decoders should downsample large images to fit under this limit
     // (and then return the downsampled size from decodedSize()). Ignoring
     // this limit can cause excessive memory use or even crashes on low-
@@ skipping 12 matching lines @@
 
     IntSize m_size;
     bool m_sizeAvailable;
     bool m_isAllDataReceived;
     bool m_failed;
 };
 
 } // namespace blink
 
 #endif