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      1 /*
      2  * Copyright (C) 2010 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 
     32 #ifndef VideoLayerChromium_h
     33 #define VideoLayerChromium_h
     34 
     35 #if USE(ACCELERATED_COMPOSITING)
     36 
     37 #include "LayerChromium.h"
     38 #include "VideoFrameProvider.h"
     39 
     40 namespace WebCore {
     41 
     42 // A Layer that contains a Video element.
     43 class VideoLayerChromium : public LayerChromium {
     44 public:
     45     struct Texture {
     46         unsigned id;
     47         IntSize size;
     48         IntSize visibleSize;
     49         bool ownedByLayerRenderer;
     50         bool isEmpty;
     51     };
     52 
     53     static PassRefPtr<VideoLayerChromium> create(GraphicsLayerChromium* owner = 0,
     54                                                  VideoFrameProvider* = 0);
     55     virtual ~VideoLayerChromium();
     56 
     57     virtual PassRefPtr<CCLayerImpl> createCCLayerImpl();
     58 
     59     virtual void updateCompositorResources();
     60     virtual bool drawsContent() const { return true; }
     61 
     62     // This function is called by VideoFrameProvider. When this method is called
     63     // putCurrentFrame() must be called to return the frame currently held.
     64     void releaseCurrentFrame();
     65 
     66     virtual void pushPropertiesTo(CCLayerImpl*);
     67 
     68 protected:
     69     virtual void cleanupResources();
     70     virtual const char* layerTypeAsString() const { return "VideoLayer"; }
     71 
     72 private:
     73     VideoLayerChromium(GraphicsLayerChromium* owner, VideoFrameProvider*);
     74 
     75     static unsigned determineTextureFormat(const VideoFrameChromium*);
     76     static IntSize computeVisibleSize(const VideoFrameChromium*, unsigned plane);
     77     void deleteTexturesInUse();
     78 
     79     bool allocateTexturesIfNeeded(GraphicsContext3D*, const VideoFrameChromium*, unsigned textureFormat);
     80     void allocateTexture(GraphicsContext3D*, unsigned textureId, const IntSize& dimensions, unsigned textureFormat) const;
     81 
     82     void updateTexture(GraphicsContext3D*, unsigned textureId, const IntSize& dimensions, unsigned textureFormat, const void* data) const;
     83 
     84     void resetFrameParameters();
     85     void saveCurrentFrame(VideoFrameChromium*);
     86 
     87     bool m_skipsDraw;
     88     VideoFrameChromium::Format m_frameFormat;
     89     VideoFrameProvider* m_provider;
     90 
     91     Texture m_textures[3];
     92 
     93     // This will be null for the entire duration of video playback if hardware
     94     // decoding is not being used.
     95     VideoFrameChromium* m_currentFrame;
     96 };
     97 
     98 }
     99 #endif // USE(ACCELERATED_COMPOSITING)
    100 
    101 #endif
    102