Save a bitmap copy when advancing to dependent GIF and WebP animation frames

third_party/WebKit/Source/platform/image-decoders/ImageFrame.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 14 matching lines @@
  */
 
 #ifndef ImageFrame_h
 #define ImageFrame_h
 
 #include "platform/PlatformExport.h"
 #include "platform/geometry/IntRect.h"
 #include "public/platform/WebVector.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkColorPriv.h"
+#include "third_party/skia/include/core/SkImage.h"
 #include "wtf/Allocator.h"
 #include "wtf/Assertions.h"
 #include "wtf/PassRefPtr.h"
 
 namespace blink {
 
 // ImageFrame represents the decoded image data.  This buffer is what all
 // decoders write a single frame into.
 class PLATFORM_EXPORT ImageFrame final {
     DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
@@ skipping 45 matching lines @@
     // These do not touch other metadata, only the raw pixel data.
     void clearPixelData();
     void zeroFillPixelData();
     void zeroFillFrameRect(const IntRect&);
 
     // Makes this frame have an independent copy of the provided image's
     // pixel data, so that modifications in one frame are not reflected in
     // the other.  Returns whether the copy succeeded.
     bool copyBitmapData(const ImageFrame&);
 
+    // Moves the bitmap data from the provided frame to this one, leaving the
+    // provided frame empty.  Operation is successful only if bitmap data is not
+    // marked as done (immutable).  Returns whether the move succeeded.
+    bool takeBitmapDataIfWritable(ImageFrame*);
+
     // Copies the pixel data at [(startX, startY), (endX, startY)) to the
     // same X-coordinates on each subsequent row up to but not including
     // endY.
     void copyRowNTimes(int startX, int endX, int startY, int endY)
     {
         ASSERT(startX < width());
         ASSERT(endX <= width());
         ASSERT(startY < height());
         ASSERT(endY <= height());
         const int rowBytes = (endX - startX) * sizeof(PixelData);
         const PixelData* const startAddr = getAddr(startX, startY);
         for (int destY = startY + 1; destY < endY; ++destY)
             memcpy(getAddr(startX, destY), startAddr, rowBytes);
     }
 
     // Allocates space for the pixel data.  Must be called before any pixels
     // are written.  Must only be called once.  Returns whether allocation
     // succeeded.
     bool setSizeAndColorProfile(int newWidth, int newHeight, const ICCProfile& newIccProfile);
 
     bool hasAlpha() const;
     const IntRect& originalFrameRect() const { return m_originalFrameRect; }
     Status getStatus() const { return m_status; }
     unsigned duration() const { return m_duration; }
     DisposalMethod getDisposalMethod() const { return m_disposalMethod; }
     AlphaBlendSource getAlphaBlendSource() const { return m_alphaBlendSource; }
     bool premultiplyAlpha() const { return m_premultiplyAlpha; }
     SkBitmap::Allocator* allocator() const { return m_allocator; }
+
+    // Returns the bitmap that is the output of decoding.
     const SkBitmap& bitmap() const { return m_bitmap; }
+
+    // Create SkImage from bitmap() and return it.  This should be called only
+    // if frame is complete.  The bitmap is set immutable before creating
+    // SkImage to avoid copying bitmap in SkImage::MakeFromBitmap(m_bitmap).
+    sk_sp<SkImage> finalizePixelsAndGetImage();
+
     // Returns true if the pixels changed, but the bitmap has not yet been notified.
     bool pixelsChanged() const { return m_pixelsChanged; }
     size_t requiredPreviousFrameIndex() const { return m_requiredPreviousFrameIndex; }
     void setHasAlpha(bool alpha);
     void setOriginalFrameRect(const IntRect& r) { m_originalFrameRect = r; }
     void setStatus(Status);
     void setDuration(unsigned duration) { m_duration = duration; }
     void setDisposalMethod(DisposalMethod disposalMethod) { m_disposalMethod = disposalMethod; }
     void setAlphaBlendSource(AlphaBlendSource alphaBlendSource) { m_alphaBlendSource = alphaBlendSource; }
     void setPremultiplyAlpha(bool premultiplyAlpha) { m_premultiplyAlpha = premultiplyAlpha; }
@@ skipping 78 matching lines @@
     // The frame that must be decoded before this frame can be decoded.
     // WTF::kNotFound if this frame doesn't require any previous frame.
     // This is used by ImageDecoder::clearCacheExceptFrame(), and will never
     // be read for image formats that do not have multiple frames.
     size_t m_requiredPreviousFrameIndex;
 };
 
 } // namespace blink
 
 #endif