third_party/WebKit/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/GraphicsTypes.h"
#include "third_party/khronos/GLES2/gl2.h"
#include "third_party/skia/include/core/SkPaint.h"
#include "wtf/Allocator.h"
#include "wtf/Noncopyable.h"
#include "wtf/PassRefPtr.h"

class SkBitmap;
class SkCanvas;
class SkImage;
struct SkImageInfo;
class SkPicture;

namespace blink {

class ImageBuffer;
class WebLayer;
class FloatRect;
class GraphicsContext;

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

    virtual SkCanvas* canvas() = 0;
    virtual void disableDeferral(DisableDeferralReason) { }
    virtual void willOverwriteCanvas() { }
    virtual void didDraw(const FloatRect& rect) { }
    virtual bool isValid() const = 0;
    virtual bool restore() { return false; }
    virtual WebLayer* layer() const { return 0; }
    virtual bool isAccelerated() const { return false; }
    virtual bool isRecording() const { return false; }
    virtual bool isExpensiveToPaint() { return false; }
    virtual void setFilterQuality(SkFilterQuality) { }
    virtual void setIsHidden(bool) { }
    virtual void setImageBuffer(ImageBuffer*) { }
    virtual PassRefPtr<SkPicture> getPicture();
    virtual void finalizeFrame(const FloatRect &dirtyRect) { }
    virtual void draw(GraphicsContext&, const FloatRect& destRect, const FloatRect& srcRect, SkXfermode::Mode);
    virtual void setHasExpensiveOp() { }
    virtual GLuint getBackingTextureHandleForOverwrite() { return 0; }
    virtual void flush(FlushReason); // Execute all deferred rendering immediately
    virtual void flushGpu(FlushReason reason) { flush(reason); } // Like flush, but flushes all the way down to the GPU context if the surface uses the GPU
    virtual void prepareSurfaceForPaintingIfNeeded() { }
    virtual bool writePixels(const SkImageInfo& origInfo, const void* pixels, size_t rowBytes, int x, int y);

    // May return nullptr if the surface is GPU-backed and the GPU context was lost.
    virtual PassRefPtr<SkImage> newImageSnapshot(AccelerationHint, SnapshotReason) = 0;

    OpacityMode getOpacityMode() 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