Source/platform/graphics/ImageBufferSurface.h

/*
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#ifndef ImageBufferSurface_h
#define ImageBufferSurface_h

#include "platform/PlatformExport.h"
#include "platform/geometry/IntSize.h"
#include "platform/graphics/GraphicsTypes3D.h"
#include "wtf/FastAllocBase.h"
#include "wtf/Noncopyable.h"
#include "wtf/PassRefPtr.h"

class SkBitmap;
class SkCanvas;
class SkPicture;

namespace blink {

class ImageBuffer;
class WebLayer;
class FloatRect;

enum OpacityMode {
    NonOpaque,
    Opaque,
};

class PLATFORM_EXPORT ImageBufferSurface {
    WTF_MAKE_NONCOPYABLE(ImageBufferSurface); WTF_MAKE_FAST_ALLOCATED;
public:
    virtual ~ImageBufferSurface() { }

    virtual SkCanvas* canvas() const = 0;
    virtual const SkBitmap& bitmap();
    virtual void willAccessPixels() { }
    virtual bool isValid() const = 0;
    virtual bool restore() { return false; };
    virtual WebLayer* layer() const { return 0; };
    virtual bool isAccelerated() const { return false; }
    virtual Platform3DObject getBackingTexture() const { return 0; }
    virtual bool cachedBitmapEnabled() const { return false; }
    virtual const SkBitmap& cachedBitmap() const;
    virtual void invalidateCachedBitmap() { }
    virtual void updateCachedBitmapIfNeeded() { }
    virtual void setIsHidden(bool) { }
    virtual void setImageBuffer(ImageBuffer*) { }
    virtual PassRefPtr<SkPicture> getPicture();
    virtual void didClearCanvas() { }
    virtual void finalizeFrame(const FloatRect &dirtyRect) { }

    OpacityMode opacityMode() const { return m_opacityMode; }
    const IntSize& size() const { return m_size; }
    void notifyIsValidChanged(bool isValid) const;

protected:
    ImageBufferSurface(const IntSize&, OpacityMode);
    void clear();

private:
    OpacityMode m_opacityMode;
    IntSize m_size;
};

} // namespace blink

#endif