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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 #ifndef DrawingBuffer_h
     32 #define DrawingBuffer_h
     33 
     34 #include "GraphicsContext3D.h"
     35 #include "GraphicsLayer.h"
     36 #include "IntSize.h"
     37 
     38 #include <wtf/Noncopyable.h>
     39 #include <wtf/OwnPtr.h>
     40 #include <wtf/PassOwnPtr.h>
     41 #if PLATFORM(MAC)
     42 #include <wtf/RetainPtr.h>
     43 #endif
     44 
     45 #if ENABLE(SKIA_GPU)
     46 class GrContext;
     47 struct GrPlatformSurfaceDesc;
     48 #endif
     49 
     50 namespace WebCore {
     51 
     52 #if PLATFORM(CHROMIUM)
     53 struct DrawingBufferInternal;
     54 #endif
     55 
     56 // Manages a rendering target (framebuffer + attachment) for a canvas.  Can publish its rendering
     57 // results to a PlatformLayer for compositing.
     58 class DrawingBuffer : public RefCounted<DrawingBuffer> {
     59 public:
     60     friend class GraphicsContext3D;
     61 
     62     ~DrawingBuffer();
     63 
     64     void clearFramebuffer();
     65 
     66     // Returns true if the buffer was successfully resized.
     67     bool reset(const IntSize&);
     68     void bind();
     69     IntSize size() const { return m_size; }
     70     Platform3DObject colorBuffer() const { return m_colorBuffer; }
     71 
     72     // Clear all resources from this object, as well as context. Called when context is destroyed
     73     // to prevent invalid accesses to the resources.
     74     void clear();
     75 
     76     // Create the depth/stencil and multisample buffers, if needed.
     77     void createSecondaryBuffers();
     78 
     79     void resizeDepthStencil(int sampleCount);
     80 
     81     // Copies the multisample color buffer to the normal color buffer and leaves m_fbo bound
     82     void commit(long x = 0, long y = 0, long width = -1, long height = -1);
     83 
     84     bool multisample() const { return m_context && m_context->getContextAttributes().antialias && m_multisampleExtensionSupported; }
     85 
     86     Platform3DObject platformColorBuffer() const;
     87 
     88 #if USE(ACCELERATED_COMPOSITING)
     89     PlatformLayer* platformLayer();
     90     void publishToPlatformLayer();
     91 #endif
     92 
     93 #if PLATFORM(CHROMIUM)
     94     class WillPublishCallback {
     95         WTF_MAKE_NONCOPYABLE(WillPublishCallback);
     96     public:
     97         WillPublishCallback() { }
     98         virtual ~WillPublishCallback() { }
     99 
    100         virtual void willPublish() = 0;
    101     };
    102 
    103     void setWillPublishCallback(PassOwnPtr<WillPublishCallback> callback) { m_callback = callback; }
    104 #endif
    105 
    106 #if ENABLE(SKIA_GPU)
    107     void setGrContext(GrContext* ctx);
    108     void getGrPlatformSurfaceDesc(GrPlatformSurfaceDesc*);
    109 #endif
    110 
    111     PassRefPtr<GraphicsContext3D> graphicsContext3D() const { return m_context; }
    112 
    113 private:
    114     static PassRefPtr<DrawingBuffer> create(GraphicsContext3D*, const IntSize&);
    115 
    116     DrawingBuffer(GraphicsContext3D*, const IntSize&, bool multisampleExtensionSupported, bool packedDepthStencilExtensionSupported);
    117 
    118     // Platform specific function called after reset() so each platform can do extra work if needed
    119     void didReset();
    120 
    121     RefPtr<GraphicsContext3D> m_context;
    122     IntSize m_size;
    123     bool m_multisampleExtensionSupported;
    124     bool m_packedDepthStencilExtensionSupported;
    125     Platform3DObject m_fbo;
    126     Platform3DObject m_colorBuffer;
    127 
    128     // This is used when we have OES_packed_depth_stencil.
    129     Platform3DObject m_depthStencilBuffer;
    130 
    131     // These are used when we don't.
    132     Platform3DObject m_depthBuffer;
    133     Platform3DObject m_stencilBuffer;
    134 
    135     // For multisampling
    136     Platform3DObject m_multisampleFBO;
    137     Platform3DObject m_multisampleColorBuffer;
    138 
    139 #if PLATFORM(CHROMIUM)
    140     OwnPtr<WillPublishCallback> m_callback;
    141     OwnPtr<DrawingBufferInternal> m_internal;
    142 #endif
    143 
    144 #if PLATFORM(MAC)
    145     RetainPtr<WebGLLayer> m_platformLayer;
    146 #endif
    147 
    148 #if ENABLE(SKIA_GPU)
    149     GrContext* m_grContext;
    150 #endif
    151 };
    152 
    153 } // namespace WebCore
    154 
    155 #endif // DrawingBuffer_h
    156