1// Copyright (c) 2011 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_RENDERER_PEPPER_PPB_BUFFER_IMPL_H_
6#define CONTENT_RENDERER_PEPPER_PPB_BUFFER_IMPL_H_
7
8#include "base/basictypes.h"
9#include "base/memory/ref_counted.h"
10#include "base/memory/scoped_ptr.h"
11#include "base/memory/shared_memory.h"
12#include "ppapi/shared_impl/resource.h"
13#include "ppapi/thunk/ppb_buffer_api.h"
14
15namespace content {
16
17class PPB_Buffer_Impl : public ppapi::Resource,
18                        public ppapi::thunk::PPB_Buffer_API {
19 public:
20  static PP_Resource Create(PP_Instance instance, uint32_t size);
21  static scoped_refptr<PPB_Buffer_Impl> CreateResource(PP_Instance instance,
22                                                       uint32_t size);
23
24  virtual PPB_Buffer_Impl* AsPPB_Buffer_Impl();
25
26  base::SharedMemory* shared_memory() const { return shared_memory_.get(); }
27  uint32_t size() const { return size_; }
28
29  // Resource overrides.
30  virtual ppapi::thunk::PPB_Buffer_API* AsPPB_Buffer_API() OVERRIDE;
31
32  // PPB_Buffer_API implementation.
33  virtual PP_Bool Describe(uint32_t* size_in_bytes) OVERRIDE;
34  virtual PP_Bool IsMapped() OVERRIDE;
35  virtual void* Map() OVERRIDE;
36  virtual void Unmap() OVERRIDE;
37
38  // Trusted.
39  virtual int32_t GetSharedMemory(int* handle) OVERRIDE;
40
41 private:
42  virtual ~PPB_Buffer_Impl();
43
44  explicit PPB_Buffer_Impl(PP_Instance instance);
45  bool Init(uint32_t size);
46
47  scoped_ptr<base::SharedMemory> shared_memory_;
48  uint32_t size_;
49  int map_count_;
50
51  DISALLOW_COPY_AND_ASSIGN(PPB_Buffer_Impl);
52};
53
54// Ensures that the given buffer is mapped, and returns it to its previous
55// mapped state in the destructor.
56class BufferAutoMapper {
57 public:
58  explicit BufferAutoMapper(ppapi::thunk::PPB_Buffer_API* api);
59  ~BufferAutoMapper();
60
61  // Will be NULL on failure to map.
62  void* data() { return data_; }
63  uint32_t size() { return size_; }
64
65 private:
66  ppapi::thunk::PPB_Buffer_API* api_;
67
68  bool needs_unmap_;
69
70  void* data_;
71  uint32_t size_;
72
73  DISALLOW_COPY_AND_ASSIGN(BufferAutoMapper);
74};
75
76}  // namespace content
77
78#endif  // CONTENT_RENDERER_PEPPER_PPB_BUFFER_IMPL_H_
79