gecko-dev/gfx/layers/ipc/ShadowLayerUtilsGralloc.h

112 lines
3.1 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: sw=2 ts=8 et :
*/
/* 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 mozilla_layers_ShadowLayerUtilsGralloc_h
#define mozilla_layers_ShadowLayerUtilsGralloc_h
#include <unistd.h>
#include <ui/GraphicBuffer.h>
#include "ipc/IPCMessageUtils.h"
#include "mozilla/layers/PGrallocBufferChild.h"
#include "mozilla/layers/PGrallocBufferParent.h"
#define MOZ_HAVE_SURFACEDESCRIPTORGRALLOC
#define MOZ_HAVE_PLATFORM_SPECIFIC_LAYER_BUFFERS
class gfxASurface;
namespace mozilla {
namespace layers {
class MaybeMagicGrallocBufferHandle;
class SurfaceDescriptorGralloc;
/**
* This class exists to share the underlying GraphicBuffer resources
* from one thread context to another. This requires going through
* slow paths in the kernel so can be somewhat expensive.
*
* This is not just platform-specific, but also
* gralloc-implementation-specific.
*/
struct MagicGrallocBufferHandle {
typedef android::GraphicBuffer GraphicBuffer;
MagicGrallocBufferHandle()
{ }
MagicGrallocBufferHandle(const android::sp<GraphicBuffer>& aGraphicBuffer);
// Default copy ctor and operator= are OK
bool operator==(const MagicGrallocBufferHandle& aOther) const {
return mGraphicBuffer == aOther.mGraphicBuffer;
}
android::sp<GraphicBuffer> mGraphicBuffer;
};
/**
* GrallocBufferActor is an "IPC wrapper" for an underlying
* GraphicBuffer (pmem region). It allows us to cheaply and
* conveniently share gralloc handles between processes.
*/
class GrallocBufferActor : public PGrallocBufferChild
, public PGrallocBufferParent
{
friend class ShadowLayerForwarder;
friend class ShadowLayerManager;
friend class ImageBridgeChild;
typedef android::GraphicBuffer GraphicBuffer;
public:
virtual ~GrallocBufferActor();
static PGrallocBufferParent*
Create(const gfxIntSize& aSize, const gfxContentType& aContent,
MaybeMagicGrallocBufferHandle* aOutHandle);
static PGrallocBufferParent*
Create(const gfxIntSize& aSize, const uint32_t& aFormat, const uint32_t& aUsage,
MaybeMagicGrallocBufferHandle* aOutHandle);
static PGrallocBufferChild*
Create();
static android::sp<GraphicBuffer>
GetFrom(const SurfaceDescriptorGralloc& aDescriptor);
private:
GrallocBufferActor();
void InitFromHandle(const MagicGrallocBufferHandle& aHandle);
android::sp<GraphicBuffer> mGraphicBuffer;
// This value stores the number of bytes allocated in this
// BufferActor. This will be used for the memory reporter.
size_t mAllocBytes;
};
} // namespace layers
} // namespace mozilla
namespace IPC {
template <>
struct ParamTraits<mozilla::layers::MagicGrallocBufferHandle> {
typedef mozilla::layers::MagicGrallocBufferHandle paramType;
static void Write(Message* aMsg, const paramType& aParam);
static bool Read(const Message* aMsg, void** aIter, paramType* aResult);
};
} // namespace IPC
#endif // mozilla_layers_ShadowLayerUtilsGralloc_h