michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
michael@0:  * You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef GFXSHMCOWSURFACEWRAPPER
michael@0: #define GFXSHMCOWSURFACEWRAPPER
michael@0: 
michael@0: #include "gfxReusableSurfaceWrapper.h"
michael@0: #include "mozilla/RefPtr.h"
michael@0: 
michael@0: class gfxSharedImageSurface;
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace ipc {
michael@0: class Shmem;
michael@0: }
michael@0: namespace layers {
michael@0: class ISurfaceAllocator;
michael@0: }
michael@0: }
michael@0: 
michael@0: /**
michael@0:  * A cross-process capable implementation of gfxReusableSurfaceWrapper based
michael@0:  * on gfxSharedImageSurface.
michael@0:  */
michael@0: class gfxReusableSharedImageSurfaceWrapper : public gfxReusableSurfaceWrapper {
michael@0: public:
michael@0:   gfxReusableSharedImageSurfaceWrapper(mozilla::layers::ISurfaceAllocator* aAllocator,
michael@0:                                        gfxSharedImageSurface* aSurface);
michael@0:   ~gfxReusableSharedImageSurfaceWrapper();
michael@0: 
michael@0:   const unsigned char* GetReadOnlyData() const MOZ_OVERRIDE;
michael@0:   gfxImageFormat Format() MOZ_OVERRIDE;
michael@0:   gfxReusableSurfaceWrapper* GetWritable(gfxImageSurface** aSurface) MOZ_OVERRIDE;
michael@0:   void ReadLock() MOZ_OVERRIDE;
michael@0:   void ReadUnlock() MOZ_OVERRIDE;
michael@0: 
michael@0:   Type GetType()
michael@0:   {
michael@0:     return TYPE_SHARED_IMAGE;
michael@0:   }
michael@0: 
michael@0:   /**
michael@0:    * Returns the shared memory segment that backs the shared image surface.
michael@0:    */
michael@0:   mozilla::ipc::Shmem& GetShmem();
michael@0: 
michael@0:   /**
michael@0:    * Create a gfxReusableSurfaceWrapper from the shared memory segment of a
michael@0:    * gfxSharedImageSurface. A ReadLock must be held, which will be adopted by
michael@0:    * the returned gfxReusableSurfaceWrapper.
michael@0:    */
michael@0:   static already_AddRefed<gfxReusableSharedImageSurfaceWrapper>
michael@0:   Open(mozilla::layers::ISurfaceAllocator* aAllocator, const mozilla::ipc::Shmem& aShmem);
michael@0: 
michael@0: private:
michael@0:   mozilla::RefPtr<mozilla::layers::ISurfaceAllocator> mAllocator;
michael@0:   nsRefPtr<gfxSharedImageSurface>         mSurface;
michael@0: };
michael@0: 
michael@0: #endif // GFXSHMCOWSURFACEWRAPPER