VideoLayerChromium.h   [plain text]

/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
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 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#ifndef VideoLayerChromium_h
#define VideoLayerChromium_h

#if USE(ACCELERATED_COMPOSITING)

#include "LayerChromium.h"
#include "VideoFrameProvider.h"

namespace WebCore {

// A Layer that contains a Video element.
class VideoLayerChromium : public LayerChromium {
public:
    struct Texture {
        unsigned id;
        IntSize size;
        IntSize visibleSize;
        bool ownedByLayerRenderer;
        bool isEmpty;
    };

    static PassRefPtr<VideoLayerChromium> create(GraphicsLayerChromium* owner = 0,
                                                 VideoFrameProvider* = 0);
    virtual ~VideoLayerChromium();

    virtual PassRefPtr<CCLayerImpl> createCCLayerImpl();

    virtual void updateCompositorResources();
    virtual bool drawsContent() const { return true; }

    // This function is called by VideoFrameProvider. When this method is called
    // putCurrentFrame() must be called to return the frame currently held.
    void releaseCurrentFrame();

    virtual void pushPropertiesTo(CCLayerImpl*);

protected:
    virtual void cleanupResources();
    virtual const char* layerTypeAsString() const { return "VideoLayer"; }

private:
    VideoLayerChromium(GraphicsLayerChromium* owner, VideoFrameProvider*);

    static unsigned determineTextureFormat(const VideoFrameChromium*);
    static IntSize computeVisibleSize(const VideoFrameChromium*, unsigned plane);
    void deleteTexturesInUse();

    bool allocateTexturesIfNeeded(GraphicsContext3D*, const VideoFrameChromium*, unsigned textureFormat);
    void allocateTexture(GraphicsContext3D*, unsigned textureId, const IntSize& dimensions, unsigned textureFormat) const;

    void updateTexture(GraphicsContext3D*, unsigned textureId, const IntSize& dimensions, unsigned textureFormat, const void* data) const;

    void resetFrameParameters();
    void saveCurrentFrame(VideoFrameChromium*);

    bool m_skipsDraw;
    VideoFrameChromium::Format m_frameFormat;
    VideoFrameProvider* m_provider;

    Texture m_textures[3];

    // This will be null for the entire duration of video playback if hardware
    // decoding is not being used.
    VideoFrameChromium* m_currentFrame;
};

}
#endif // USE(ACCELERATED_COMPOSITING)

#endif