Add multi-process GpuMemoryBuffer framework.

content/common/gpu/client/gpu_channel_host.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_COMMON_GPU_CLIENT_GPU_CHANNEL_HOST_H_
 #define CONTENT_COMMON_GPU_CLIENT_GPU_CHANNEL_HOST_H_
 
 #include <string>
 #include <vector>
 
 #include "base/atomic_sequence_num.h"
 #include "base/containers/hash_tables.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/process/process.h"
 #include "base/synchronization/lock.h"
 #include "content/common/content_export.h"
 #include "content/common/gpu/gpu_process_launch_causes.h"
 #include "content/common/message_router.h"
 #include "gpu/config/gpu_info.h"
 #include "ipc/ipc_channel_handle.h"
 #include "ipc/ipc_channel_proxy.h"
 #include "ipc/ipc_sync_channel.h"
 #include "media/video/video_decode_accelerator.h"
 #include "media/video/video_encode_accelerator.h"
+#include "ui/gfx/gpu_memory_buffer.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/size.h"
 #include "ui/gl/gpu_preference.h"
 
 class GURL;
 class TransportTextureService;
 struct GPUCreateCommandBufferConfig;
 
 namespace base {
 class MessageLoop;
@@ skipping 33 matching lines @@
   virtual base::WaitableEvent* GetShutDownEvent() = 0;
   virtual scoped_ptr<base::SharedMemory> AllocateSharedMemory(size_t size) = 0;
   virtual int32 CreateViewCommandBuffer(
       int32 surface_id, const GPUCreateCommandBufferConfig& init_params) = 0;
   virtual GpuChannelHost* EstablishGpuChannelSync(CauseForGpuLaunch) = 0;
   virtual void CreateImage(
       gfx::PluginWindowHandle window,
       int32 image_id,
       const CreateImageCallback& callback) = 0;
   virtual void DeleteImage(int32 image_id, int32 sync_point) = 0;
+  virtual scoped_ptr<gfx::GpuMemoryBuffer> AllocateGpuMemoryBuffer(
+      size_t width,
+      size_t height,
+      unsigned internalformat) = 0;
 };
 
 // Encapsulates an IPC channel between the client and one GPU process.
 // On the GPU process side there's a corresponding GpuChannel.
 // Every method can be called on any thread with a message loop, except for the
 // IO thread.
 class GpuChannelHost : public IPC::Sender,
                        public base::RefCountedThreadSafe<GpuChannelHost> {
  public:
   // Must be called on the main thread (as defined by the factory).
@@ skipping 65 matching lines @@
 
   // Generates |num| unique mailbox names that can be used with
   // GL_texture_mailbox_CHROMIUM. Unlike genMailboxCHROMIUM, this IPC is
   // handled only on the GPU process' IO thread, and so is not effectively
   // a finish.
   bool GenerateMailboxNames(unsigned num, std::vector<gpu::Mailbox>* names);
 
   // Reserve one unused transfer buffer ID.
   int32 ReserveTransferBufferId();
 
+  // Returns a GPU memory buffer handle to the buffer that can be sent via
+  // IPC to the GPU process. The caller is responsible for ensuring it is
+  // closed. Returns an invalid handle on failure.
+  gfx::GpuMemoryBufferHandle ShareGpuMemoryBufferToGpuProcess(
+      gfx::GpuMemoryBufferHandle source_handle);
+
+  // Reserve one unused gpu memory buffer ID.
+  int32 ReserveGpuMemoryBufferId();
+
  private:
   friend class base::RefCountedThreadSafe<GpuChannelHost>;
   GpuChannelHost(GpuChannelHostFactory* factory,
                  int gpu_host_id,
                  int client_id,
                  const gpu::GPUInfo& gpu_info);
   virtual ~GpuChannelHost();
   void Connect(const IPC::ChannelHandle& channel_handle);
 
   // A filter used internally to route incoming messages from the IO thread
@@ skipping 46 matching lines @@
     // A pool of valid mailbox names.
     std::vector<gpu::Mailbox> mailbox_name_pool_;
 
     // Number of pending mailbox requested from the GPU process.
     size_t requested_mailboxes_;
   };
 
   // Threading notes: all fields are constant during the lifetime of |this|
   // except:
   // - |next_transfer_buffer_id_|, atomic type
+  // - |next_gpu_memory_buffer_id_|, atomic type
   // - |proxies_|, protected by |context_lock_|
   GpuChannelHostFactory* const factory_;
   const int client_id_;
   const int gpu_host_id_;
 
   const gpu::GPUInfo gpu_info_;
 
   scoped_ptr<IPC::SyncChannel> channel_;
   scoped_refptr<MessageFilter> channel_filter_;
 
   // A filter for sending messages from thread other than the main thread.
   scoped_refptr<IPC::SyncMessageFilter> sync_filter_;
 
   // Transfer buffer IDs are allocated in sequence.
   base::AtomicSequenceNumber next_transfer_buffer_id_;
 
+  // Gpu memory buffer IDs are allocated in sequence.
+  base::AtomicSequenceNumber next_gpu_memory_buffer_id_;
+
   // Protects proxies_.
   mutable base::Lock context_lock_;
   // Used to look up a proxy from its routing id.
   typedef base::hash_map<int, CommandBufferProxyImpl*> ProxyMap;
   ProxyMap proxies_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuChannelHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_GPU_CHANNEL_HOST_H_