/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * 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
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


#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:
    static PassRefPtr<VideoLayerChromium> create(GraphicsLayerChromium* owner = 0,
                                                 VideoFrameProvider* = 0);
    virtual ~VideoLayerChromium();
    virtual void updateContents();
    virtual bool drawsContent() { return true; }
    virtual void draw();

    class SharedValues {
    public:
        explicit SharedValues(GraphicsContext3D*);
        ~SharedValues();
        unsigned yuvShaderProgram() const { return m_yuvShaderProgram; }
        unsigned rgbaShaderProgram() const { return m_rgbaShaderProgram; }
        int yuvShaderMatrixLocation() const { return m_yuvShaderMatrixLocation; }
        int rgbaShaderMatrixLocation() const { return m_rgbaShaderMatrixLocation; }
        int yuvWidthScaleFactorLocation() const { return m_yuvWidthScaleFactorLocation; }
        int rgbaWidthScaleFactorLocation() const { return m_rgbaWidthScaleFactorLocation; }
        int yTextureLocation() const { return m_yTextureLocation; }
        int uTextureLocation() const { return m_uTextureLocation; }
        int vTextureLocation() const { return m_vTextureLocation; }
        int yuvAlphaLocation() const { return m_yuvAlphaLocation; }
        int rgbaAlphaLocation() const { return m_rgbaAlphaLocation; }
        int rgbaTextureLocation() const { return m_rgbaTextureLocation; }
        int ccMatrixLocation() const { return m_ccMatrixLocation; }
        bool initialized() const { return m_initialized; };
    private:
        GraphicsContext3D* m_context;
        unsigned m_yuvShaderProgram;
        unsigned m_rgbaShaderProgram;
        int m_yuvShaderMatrixLocation;
        int m_yuvWidthScaleFactorLocation;
        int m_rgbaShaderMatrixLocation;
        int m_rgbaWidthScaleFactorLocation;
        int m_ccMatrixLocation;
        int m_yTextureLocation;
        int m_uTextureLocation;
        int m_vTextureLocation;
        int m_rgbaTextureLocation;
        int m_yuvAlphaLocation;
        int m_rgbaAlphaLocation;
        bool m_initialized;
    };

private:
    VideoLayerChromium(GraphicsLayerChromium* owner, VideoFrameProvider*);
    static unsigned determineTextureFormat(VideoFrameChromium*);
    bool allocateTexturesIfNeeded(GraphicsContext3D*, VideoFrameChromium*, unsigned textureFormat);
    void updateYUVContents(GraphicsContext3D*, const VideoFrameChromium*);
    void updateRGBAContents(GraphicsContext3D*, const VideoFrameChromium*);
    void allocateTexture(GraphicsContext3D*, unsigned textureId, const IntSize& dimensions, unsigned textureFormat);
    void updateTexture(GraphicsContext3D*, unsigned textureId, const IntSize& dimensions, unsigned textureFormat, const void* data);
    void drawYUV(const SharedValues*);
    void drawRGBA(const SharedValues*);

    static const float yuv2RGB[9];

    bool m_skipsDraw;
    VideoFrameChromium::Format m_frameFormat;
    OwnPtr<VideoFrameProvider> m_provider;
    unsigned m_textures[3];
    IntSize m_textureSizes[3];
    IntSize m_frameSizes[3];
};

}
#endif // USE(ACCELERATED_COMPOSITING)

#endif