cc/FrameBufferSkPictureCanvasLayerTextureUpdater.h

// Copyright 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.


#ifndef FrameBufferSkPictureCanvasLayerTextureUpdater_h
#define FrameBufferSkPictureCanvasLayerTextureUpdater_h

#if USE(ACCELERATED_COMPOSITING)

#include "SkPictureCanvasLayerTextureUpdater.h"

class GrContext;

namespace WebKit {
class WebGraphicsContext3D;
class WebSharedGraphicsContext3D;
}

namespace cc {

// This class records the contentRect into an SkPicture, then uses accelerated
// drawing to update the texture. The accelerated drawing goes to an
// intermediate framebuffer and then is copied to the destination texture once done.
class FrameBufferSkPictureCanvasLayerTextureUpdater : public SkPictureCanvasLayerTextureUpdater {
public:
    class Texture : public LayerTextureUpdater::Texture {
    public:
        Texture(FrameBufferSkPictureCanvasLayerTextureUpdater*, PassOwnPtr<CCPrioritizedTexture>);
        virtual ~Texture();

        virtual void updateRect(CCResourceProvider*, const IntRect& sourceRect, const IntSize& destOffset) OVERRIDE;

    private:
        FrameBufferSkPictureCanvasLayerTextureUpdater* textureUpdater() { return m_textureUpdater; }

        FrameBufferSkPictureCanvasLayerTextureUpdater* m_textureUpdater;
    };

    static PassRefPtr<FrameBufferSkPictureCanvasLayerTextureUpdater> create(PassOwnPtr<LayerPainterChromium>);
    virtual ~FrameBufferSkPictureCanvasLayerTextureUpdater();

    virtual PassOwnPtr<LayerTextureUpdater::Texture> createTexture(CCPrioritizedTextureManager*) OVERRIDE;
    virtual SampledTexelFormat sampledTexelFormat(GC3Denum textureFormat) OVERRIDE;
    void updateTextureRect(WebKit::WebGraphicsContext3D*, GrContext*, CCResourceProvider*, CCPrioritizedTexture*, const IntRect& sourceRect, const IntSize& destOffset);

private:
    explicit FrameBufferSkPictureCanvasLayerTextureUpdater(PassOwnPtr<LayerPainterChromium>);
};
} // namespace cc
#endif // USE(ACCELERATED_COMPOSITING)
#endif // FrameBufferSkPictureCanvasLayerTextureUpdater_h