SkPictureCanvasLayerTextureUpdater.h   [plain text]

/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
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#ifndef SkPictureCanvasLayerTextureUpdater_h
#define SkPictureCanvasLayerTextureUpdater_h

#if USE(ACCELERATED_COMPOSITING)

#include "CanvasLayerTextureUpdater.h"
#include "SkPicture.h"

class SkCanvas;

namespace WebCore {

class LayerPainterChromium;

// This class records the contentRect into an SkPicture. Subclasses, provide
// different implementations of tile updating based on this recorded picture.
// The BitmapSkPictureCanvasLayerTextureUpdater and
// FrameBufferSkPictureCanvasLayerTextureUpdater are two examples of such
// implementations.
class SkPictureCanvasLayerTextureUpdater : public CanvasLayerTextureUpdater {
public:
    virtual ~SkPictureCanvasLayerTextureUpdater();

    virtual void setOpaque(bool);

protected:
    explicit SkPictureCanvasLayerTextureUpdater(PassOwnPtr<LayerPainterChromium>);

    virtual void prepareToUpdate(const IntRect& contentRect, const IntSize& tileSize, int borderTexels, float contentsScale, IntRect& resultingOpaqueRect);
    void drawPicture(SkCanvas*);

    bool layerIsOpaque() const { return m_layerIsOpaque; }

private:
    // Recording canvas.
    SkPicture m_picture;
    // True when it is known that all output pixels will be opaque.
    bool m_layerIsOpaque;
};

} // namespace WebCore
#endif // USE(ACCELERATED_COMPOSITING)
#endif // SkPictureCanvasLayerTextureUpdater_h