content/common/gpu/client/gpu_memory_buffer_impl_shm.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_SHM_H_
   6 #define CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_SHM_H_
   7
   8 #include "content/common/gpu/client/gpu_memory_buffer_impl.h"
   9
  10 namespace content {
  11
  12 // Implementation of GPU memory buffer based on shared memory.
  13 class GpuMemoryBufferImplShm : public GpuMemoryBufferImpl {
  14  public:
  15   GpuMemoryBufferImplShm(const gfx::Size& size, unsigned internalformat);
  16   virtual ~GpuMemoryBufferImplShm();
  17
  18   // Allocates a shared memory backed GPU memory buffer with |size| and
  19   // |internalformat| for use by |child_process|.
  20   static void AllocateSharedMemoryForChildProcess(
  21       const gfx::Size& size,
  22       unsigned internalformat,
  23       base::ProcessHandle child_process,
  24       const AllocationCallback& callback);
  25
  26   static bool IsLayoutSupported(const gfx::Size& size, unsigned internalformat);
  27   static bool IsUsageSupported(unsigned usage);
  28   static bool IsConfigurationSupported(const gfx::Size& size,
  29                                        unsigned internalformat,
  30                                        unsigned usage);
  31
  32   bool Initialize();
  33   bool InitializeFromHandle(gfx::GpuMemoryBufferHandle handle);
  34
  35   // Overridden from gfx::GpuMemoryBuffer:
  36   virtual void* Map() OVERRIDE;
  37   virtual void Unmap() OVERRIDE;
  38   virtual uint32 GetStride() const OVERRIDE;
  39   virtual gfx::GpuMemoryBufferHandle GetHandle() const OVERRIDE;
  40
  41  private:
  42   scoped_ptr<base::SharedMemory> shared_memory_;
  43
  44   DISALLOW_COPY_AND_ASSIGN(GpuMemoryBufferImplShm);
  45 };
  46
  47 }  // namespace content
  48
  49 #endif  // CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_SHM_H_