gecko-dev/gfx/thebes/gfxReusableSharedImageSurfa...

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C++

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