third_party/WebKit/Source/platform/graphics/Canvas2DImageBufferSurface.h

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 * in the documentation and/or other materials provided with the
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 * this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#ifndef Canvas2DImageBufferSurface_h
#define Canvas2DImageBufferSurface_h

#include "platform/graphics/Canvas2DLayerBridge.h"
#include "platform/graphics/ImageBufferSurface.h"

namespace blink {

// This shim necessary because ImageBufferSurfaces are not allowed to be RefCounted
class Canvas2DImageBufferSurface final : public ImageBufferSurface {
public:
    Canvas2DImageBufferSurface(const IntSize& size, int msaaSampleCount, OpacityMode opacityMode, Canvas2DLayerBridge::AccelerationMode accelerationMode)
        : ImageBufferSurface(size, opacityMode)
        , m_layerBridge(Canvas2DLayerBridge::create(size, msaaSampleCount, opacityMode, accelerationMode))
    {
        clear();
        if (isValid())
            m_layerBridge->flush();
    }

    ~Canvas2DImageBufferSurface() override
    {
        if (m_layerBridge)
            m_layerBridge->beginDestruction();
    }

    // ImageBufferSurface implementation
    void finalizeFrame(const FloatRect &dirtyRect) override { m_layerBridge->finalizeFrame(dirtyRect); }
    void willOverwriteCanvas() override { m_layerBridge->willOverwriteCanvas(); }
    SkCanvas* canvas() override { return m_layerBridge->canvas(); }
    void disableDeferral(DisableDeferralReason reason) override { m_layerBridge->disableDeferral(reason); }
    bool isValid() const override { return m_layerBridge && m_layerBridge->checkSurfaceValid(); }
    bool restore() override { return m_layerBridge->restoreSurface(); }
    WebLayer* layer() const override { return m_layerBridge->layer(); }
    bool isAccelerated() const override { return m_layerBridge->isAccelerated(); }
    void setFilterQuality(SkFilterQuality filterQuality) override { m_layerBridge->setFilterQuality(filterQuality); }
    void setIsHidden(bool hidden) override { m_layerBridge->setIsHidden(hidden); }
    void setImageBuffer(ImageBuffer* imageBuffer) override { m_layerBridge->setImageBuffer(imageBuffer); }
    void didDraw(const FloatRect& rect) override { m_layerBridge->didDraw(rect); }
    void flush(FlushReason) override { m_layerBridge->flush(); }
    void flushGpu(FlushReason) override { m_layerBridge->flushGpu(); }
    void prepareSurfaceForPaintingIfNeeded() override { m_layerBridge->prepareSurfaceForPaintingIfNeeded(); }
    bool writePixels(const SkImageInfo& origInfo, const void* pixels, size_t rowBytes, int x, int y) override { return m_layerBridge->writePixels(origInfo, pixels, rowBytes, x, y); }

    PassRefPtr<SkImage> newImageSnapshot(AccelerationHint hint, SnapshotReason reason) override { return m_layerBridge->newImageSnapshot(hint, reason); }
private:
    RefPtr<Canvas2DLayerBridge> m_layerBridge;
};

} // namespace blink

#endif