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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef RecordingImageBufferSurface_h
      6 #define RecordingImageBufferSurface_h
      7 
      8 #include "platform/graphics/ImageBufferSurface.h"
      9 #include "public/platform/WebThread.h"
     10 #include "third_party/skia/include/core/SkCanvas.h"
     11 #include "wtf/LinkedStack.h"
     12 #include "wtf/OwnPtr.h"
     13 #include "wtf/RefPtr.h"
     14 
     15 class SkPicture;
     16 class SkPictureRecorder;
     17 class RecordingImageBufferSurfaceTest;
     18 
     19 namespace blink {
     20 
     21 class ImageBuffer;
     22 
     23 class PLATFORM_EXPORT RecordingImageBufferSurface : public ImageBufferSurface {
     24     WTF_MAKE_NONCOPYABLE(RecordingImageBufferSurface); WTF_MAKE_FAST_ALLOCATED;
     25 public:
     26     RecordingImageBufferSurface(const IntSize&, OpacityMode = NonOpaque);
     27     virtual ~RecordingImageBufferSurface();
     28 
     29     // Implementation of ImageBufferSurface interfaces
     30     virtual SkCanvas* canvas() const OVERRIDE;
     31     virtual PassRefPtr<SkPicture> getPicture() OVERRIDE;
     32     virtual bool isValid() const OVERRIDE { return true; }
     33     virtual void willAccessPixels() OVERRIDE;
     34     virtual void finalizeFrame(const FloatRect&) OVERRIDE;
     35     virtual void didClearCanvas() OVERRIDE;
     36     virtual void setImageBuffer(ImageBuffer*) OVERRIDE;
     37 
     38 private:
     39     struct StateRec {
     40     public:
     41         SkMatrix m_ctm;
     42         // FIXME: handle transferring non-rectangular clip to the new frame, crbug.com/392614
     43         SkIRect m_clip;
     44     };
     45     typedef LinkedStack<StateRec> StateStack;
     46     friend class ::RecordingImageBufferSurfaceTest; // for unit testing
     47     void fallBackToRasterCanvas();
     48     bool initializeCurrentFrame();
     49     bool finalizeFrameInternal();
     50 
     51     // saves current clip and transform matrix of canvas
     52     bool saveState(SkCanvas*, StateStack*);
     53     // we should make sure that we can transfer state in saveState
     54     void setCurrentState(SkCanvas*, StateStack*);
     55 
     56     OwnPtr<SkPictureRecorder> m_currentFrame;
     57     RefPtr<SkPicture> m_previousFrame;
     58     OwnPtr<SkCanvas> m_rasterCanvas;
     59     ImageBuffer* m_imageBuffer;
     60     int m_initialSaveCount;
     61     bool m_frameWasCleared;
     62 };
     63 
     64 } // namespace blink
     65 
     66 #endif
     67