The Tor Browser: gfx/thebes/gfxReusableSharedImageSurfaceWrapper.h@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this file,

     3  * You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 #ifndef GFXSHMCOWSURFACEWRAPPER

     6 #define GFXSHMCOWSURFACEWRAPPER

     8 #include "gfxReusableSurfaceWrapper.h"

     9 #include "mozilla/RefPtr.h"

    11 class gfxSharedImageSurface;

    13 namespace mozilla {

    14 namespace ipc {

    15 class Shmem;

    16 }

    17 namespace layers {

    18 class ISurfaceAllocator;

    19 }

    20 }

    22 /**

    23  * A cross-process capable implementation of gfxReusableSurfaceWrapper based

    24  * on gfxSharedImageSurface.

    25  */

    26 class gfxReusableSharedImageSurfaceWrapper : public gfxReusableSurfaceWrapper {

    27 public:

    28   gfxReusableSharedImageSurfaceWrapper(mozilla::layers::ISurfaceAllocator* aAllocator,

    29                                        gfxSharedImageSurface* aSurface);

    30   ~gfxReusableSharedImageSurfaceWrapper();

    32   const unsigned char* GetReadOnlyData() const MOZ_OVERRIDE;

    33   gfxImageFormat Format() MOZ_OVERRIDE;

    34   gfxReusableSurfaceWrapper* GetWritable(gfxImageSurface** aSurface) MOZ_OVERRIDE;

    35   void ReadLock() MOZ_OVERRIDE;

    36   void ReadUnlock() MOZ_OVERRIDE;

    38   Type GetType()

    39   {

    40     return TYPE_SHARED_IMAGE;

    41   }

    43   /**

    44    * Returns the shared memory segment that backs the shared image surface.

    45    */

    46   mozilla::ipc::Shmem& GetShmem();

    48   /**

    49    * Create a gfxReusableSurfaceWrapper from the shared memory segment of a

    50    * gfxSharedImageSurface. A ReadLock must be held, which will be adopted by

    51    * the returned gfxReusableSurfaceWrapper.

    52    */

    53   static already_AddRefed<gfxReusableSharedImageSurfaceWrapper>

    54   Open(mozilla::layers::ISurfaceAllocator* aAllocator, const mozilla::ipc::Shmem& aShmem);

    56 private:

    57   mozilla::RefPtr<mozilla::layers::ISurfaceAllocator> mAllocator;

    58   nsRefPtr<gfxSharedImageSurface>         mSurface;

    59 };

    61 #endif // GFXSHMCOWSURFACEWRAPPER

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