The Tor Browser: gfx/layers/ipc/ShadowLayerUtilsGralloc.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-

     2  * vim: sw=2 ts=8 et :

     3  */

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

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

     6  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     8 #ifndef mozilla_layers_ShadowLayerUtilsGralloc_h

     9 #define mozilla_layers_ShadowLayerUtilsGralloc_h

    11 #include <unistd.h>

    12 #include <ui/GraphicBuffer.h>

    14 #include "ipc/IPCMessageUtils.h"

    15 #include "mozilla/layers/PGrallocBufferChild.h"

    16 #include "mozilla/layers/PGrallocBufferParent.h"

    18 #define MOZ_HAVE_SURFACEDESCRIPTORGRALLOC

    19 #define MOZ_HAVE_PLATFORM_SPECIFIC_LAYER_BUFFERS

    21 namespace mozilla {

    22 namespace layers {

    24 class MaybeMagicGrallocBufferHandle;

    25 class TextureHost;

    27 /**

    28  * This class exists to share the underlying GraphicBuffer resources

    29  * from one thread context to another.  This requires going through

    30  * slow paths in the kernel so can be somewhat expensive.

    31  *

    32  * This is not just platform-specific, but also

    33  * gralloc-implementation-specific.

    34  */

    35 struct MagicGrallocBufferHandle {

    36   typedef android::GraphicBuffer GraphicBuffer;

    38   MagicGrallocBufferHandle()

    39   { }

    41   MagicGrallocBufferHandle(const android::sp<GraphicBuffer>& aGraphicBuffer);

    43   // Default copy ctor and operator= are OK

    45   bool operator==(const MagicGrallocBufferHandle& aOther) const {

    46     return mGraphicBuffer == aOther.mGraphicBuffer;

    47   }

    49   android::sp<GraphicBuffer> mGraphicBuffer;

    50 };

    52 /**

    53  * GrallocBufferActor is an "IPC wrapper" for an underlying

    54  * GraphicBuffer (pmem region).  It allows us to cheaply and

    55  * conveniently share gralloc handles between processes.

    56  */

    57 class GrallocBufferActor : public PGrallocBufferChild

    58                          , public PGrallocBufferParent

    59 {

    60   friend class ShadowLayerForwarder;

    61   friend class LayerManagerComposite;

    62   friend class ImageBridgeChild;

    63   typedef android::GraphicBuffer GraphicBuffer;

    65 public:

    66   virtual ~GrallocBufferActor();

    68   static PGrallocBufferParent*

    69   Create(const gfx::IntSize& aSize,

    70          const uint32_t& aFormat,

    71          const uint32_t& aUsage,

    72          MaybeMagicGrallocBufferHandle* aOutHandle);

    74   static PGrallocBufferChild*

    75   Create();

    77   // used only for hacky fix in gecko 23 for bug 862324

    78   // see bug 865908 about fixing this.

    79   void ActorDestroy(ActorDestroyReason why) MOZ_OVERRIDE;

    81   void AddTextureHost(TextureHost* aTextureHost);

    82   void RemoveTextureHost();

    84   android::GraphicBuffer* GetGraphicBuffer();

    86   void InitFromHandle(const MagicGrallocBufferHandle& aHandle);

    88 private:

    89   GrallocBufferActor();

    91   android::sp<GraphicBuffer> mGraphicBuffer;

    93   // This value stores the number of bytes allocated in this

    94   // BufferActor. This will be used for the memory reporter.

    95   size_t mAllocBytes;

    97   // Used only for hacky fix for bug 966446.

    98   TextureHost* mTextureHost;

   100   friend class ISurfaceAllocator;

   101 };

   103 } // namespace layers

   104 } // namespace mozilla

   106 namespace IPC {

   108 template <>

   109 struct ParamTraits<mozilla::layers::MagicGrallocBufferHandle> {

   110   typedef mozilla::layers::MagicGrallocBufferHandle paramType;

   112   static void Write(Message* aMsg, const paramType& aParam);

   113   static bool Read(const Message* aMsg, void** aIter, paramType* aResult);

   114 };

   116 } // namespace IPC

   118 #endif  // mozilla_layers_ShadowLayerUtilsGralloc_h

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