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      1 /*
      2  * Copyright (C) 2011 Apple 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
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
     14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     23  * THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef ShareableSurface_h
     27 #define ShareableSurface_h
     28 
     29 #include <WebCore/IntSize.h>
     30 #include <wtf/Noncopyable.h>
     31 #include <wtf/PassRefPtr.h>
     32 #include <wtf/RefCounted.h>
     33 #include <wtf/RetainPtr.h>
     34 
     35 typedef struct _CGLContextObject* CGLContextObj;
     36 typedef struct __IOSurface* IOSurfaceRef;
     37 
     38 namespace CoreIPC {
     39     class ArgumentDecoder;
     40     class ArgumentEncoder;
     41 }
     42 
     43 namespace WebKit {
     44 
     45 class ShareableSurface : public RefCounted<ShareableSurface> {
     46 public:
     47     class Handle {
     48         WTF_MAKE_NONCOPYABLE(Handle);
     49 
     50     public:
     51         Handle();
     52         ~Handle();
     53 
     54         void encode(CoreIPC::ArgumentEncoder*) const;
     55         static bool decode(CoreIPC::ArgumentDecoder*, Handle&);
     56 
     57     private:
     58         friend class ShareableSurface;
     59 
     60         mutable mach_port_t m_port;
     61     };
     62 
     63     // Create a shareable surface with the given size. Returns 0 on failure.
     64     static PassRefPtr<ShareableSurface> create(CGLContextObj, const WebCore::IntSize&);
     65 
     66     // Create a shareable surface from a handle. Returns 0 on failure.
     67     static PassRefPtr<ShareableSurface> create(CGLContextObj, const Handle&);
     68 
     69     ~ShareableSurface();
     70 
     71     bool createHandle(Handle&);
     72 
     73     unsigned textureID();
     74 
     75     void attach();
     76     void detach();
     77 
     78 private:
     79     ShareableSurface(CGLContextObj, const WebCore::IntSize&, IOSurfaceRef);
     80 
     81     // The OpenGL context.
     82     CGLContextObj m_cglContextObj;
     83 
     84     // The size of the surface.
     85     WebCore::IntSize m_size;
     86 
     87     // The ID of the texture.
     88     unsigned m_textureID;
     89 
     90     // The frame buffer object ID of the texture; used when the surface is used as a render destination.
     91     unsigned m_frameBufferObjectID;
     92 
     93     RetainPtr<IOSurfaceRef> m_ioSurface;
     94 };
     95 
     96 } // namespace WebKit
     97 
     98 #endif // ShareableSurface_h
     99