Making display list canvases fall back to gpu-accelerated when appropriate

Source/platform/graphics/RecordingImageBufferSurface.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef RecordingImageBufferSurface_h
 #define RecordingImageBufferSurface_h
 
 #include "platform/graphics/ImageBufferSurface.h"
 #include "public/platform/WebThread.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "wtf/LinkedStack.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/RefPtr.h"
 
 class SkPicture;
 class SkPictureRecorder;
 class RecordingImageBufferSurfaceTest;
 
 namespace blink {
 
 class ImageBuffer;
 
+class RecordingImageBufferFallbackSurfaceFactory {
+public:
+    virtual PassOwnPtr<ImageBufferSurface> createSurface(const IntSize&, OpacityMode) = 0;
+    virtual ~RecordingImageBufferFallbackSurfaceFactory() { }
+};
+
 class PLATFORM_EXPORT RecordingImageBufferSurface : public ImageBufferSurface {
     WTF_MAKE_NONCOPYABLE(RecordingImageBufferSurface); WTF_MAKE_FAST_ALLOCATED;
 public:
-    RecordingImageBufferSurface(const IntSize&, OpacityMode = NonOpaque);
+    RecordingImageBufferSurface(const IntSize&, PassOwnPtr<RecordingImageBufferFallbackSurfaceFactory> fallbackFactory, OpacityMode = NonOpaque);
     virtual ~RecordingImageBufferSurface();
 
     // Implementation of ImageBufferSurface interfaces
     virtual SkCanvas* canvas() const override;
     virtual PassRefPtr<SkPicture> getPicture() override;
     virtual bool isValid() const override { return true; }
     virtual void willAccessPixels() override;
     virtual void finalizeFrame(const FloatRect&) override;
     virtual void didClearCanvas() override;
     virtual void setImageBuffer(ImageBuffer*) override;
 
+    // Passthroughs to fallback surface
+    virtual const SkBitmap& bitmap() override;
+    virtual bool restore() override;
+    virtual WebLayer* layer() const override;
+    virtual bool isAccelerated() const override;
+    virtual Platform3DObject getBackingTexture() const override;
+    virtual bool cachedBitmapEnabled() const override;
+    virtual const SkBitmap& cachedBitmap() const override;
+    virtual void invalidateCachedBitmap() override;
+    virtual void updateCachedBitmapIfNeeded() override;
+    virtual void setIsHidden(bool) override;
+
 private:
     struct StateRec {
     public:
         SkMatrix m_ctm;
         // FIXME: handle transferring non-rectangular clip to the new frame, crbug.com/392614
         SkIRect m_clip;
     };
     typedef LinkedStack<StateRec> StateStack;
     friend class ::RecordingImageBufferSurfaceTest; // for unit testing
     void fallBackToRasterCanvas();
     bool initializeCurrentFrame();
     bool finalizeFrameInternal();
 
     // saves current clip and transform matrix of canvas
     bool saveState(SkCanvas*, StateStack*);
     // we should make sure that we can transfer state in saveState
     void setCurrentState(SkCanvas*, StateStack*);
 
     OwnPtr<SkPictureRecorder> m_currentFrame;
     RefPtr<SkPicture> m_previousFrame;
-    OwnPtr<SkCanvas> m_rasterCanvas;
+    OwnPtr<ImageBufferSurface> m_fallbackSurface;
     ImageBuffer* m_imageBuffer;
     int m_initialSaveCount;
     bool m_frameWasCleared;
+    OwnPtr<RecordingImageBufferFallbackSurfaceFactory> m_fallbackFactory;
 };
 
 } // namespace blink
 
 #endif