content/common/gpu/client/gpu_memory_buffer_impl.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_H_
   6 #define CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_H_
   7
   8 #include "base/callback.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "ui/gfx/gpu_memory_buffer.h"
  11 #include "ui/gfx/size.h"
  12
  13 namespace content {
  14
  15 // Provides common implementation of a GPU memory buffer.
  16 class GpuMemoryBufferImpl : public gfx::GpuMemoryBuffer {
  17  public:
  18   typedef base::Callback<void(const gfx::GpuMemoryBufferHandle& handle)>
  19       AllocationCallback;
  20
  21   virtual ~GpuMemoryBufferImpl();
  22
  23   // Creates a GPU memory buffer instance with |size| and |internalformat| for
  24   // |usage|.
  25   static scoped_ptr<GpuMemoryBufferImpl> Create(const gfx::Size& size,
  26                                                 unsigned internalformat,
  27                                                 unsigned usage);
  28
  29   // Allocates a GPU memory buffer with |size| and |internalformat| for |usage|
  30   // by |child_process| identified by |child_id|. The |handle| returned can be
  31   // used by the |child_process| to create an instance of this class.
  32   static void AllocateForChildProcess(const gfx::Size& size,
  33                                       unsigned internalformat,
  34                                       unsigned usage,
  35                                       base::ProcessHandle child_process,
  36                                       int child_id,
  37                                       const AllocationCallback& callback);
  38
  39   // Notify that GPU memory buffer has been deleted by |child_process|.
  40   static void DeletedByChildProcess(gfx::GpuMemoryBufferType type,
  41                                     const gfx::GpuMemoryBufferId& id,
  42                                     base::ProcessHandle child_process);
  43
  44   // Creates an instance from the given |handle|. |size| and |internalformat|
  45   // should match what was used to allocate the |handle|.
  46   static scoped_ptr<GpuMemoryBufferImpl> CreateFromHandle(
  47       const gfx::GpuMemoryBufferHandle& handle,
  48       const gfx::Size& size,
  49       unsigned internalformat);
  50
  51   // Returns true if |internalformat| is a format recognized by this base class.
  52   static bool IsFormatValid(unsigned internalformat);
  53
  54   // Returns true if |usage| is recognized by this base class.
  55   static bool IsUsageValid(unsigned usage);
  56
  57   // Returns the number of bytes per pixel that must be used by an
  58   // implementation when using |internalformat|.
  59   static size_t BytesPerPixel(unsigned internalformat);
  60
  61   // Overridden from gfx::GpuMemoryBuffer:
  62   virtual bool IsMapped() const OVERRIDE;
  63
  64  protected:
  65   GpuMemoryBufferImpl(const gfx::Size& size, unsigned internalformat);
  66
  67   const gfx::Size size_;
  68   const unsigned internalformat_;
  69   bool mapped_;
  70
  71   DISALLOW_COPY_AND_ASSIGN(GpuMemoryBufferImpl);
  72 };
  73
  74 }  // namespace content
  75
  76 #endif  // CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_H_