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1 // Copyright (c) 2015 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_MEDIA_SHARED_MEMORY_REGION_H_ | |
6 #define CONTENT_COMMON_GPU_MEDIA_SHARED_MEMORY_REGION_H_ | |
7 | |
8 #include "base/memory/shared_memory.h" | |
9 #include "media/base/bitstream_buffer.h" | |
10 | |
11 namespace content { | |
12 | |
13 // Helper class to access a region of a SharedMemory. | |
14 class SharedMemoryRegion { | |
15 public: | |
16 SharedMemoryRegion(const base::SharedMemoryHandle& handle, | |
Pawel Osciak
2015/12/31 02:05:54
We should document arguments, especially offset an
Owen Lin
2016/01/04 08:54:17
Done.
| |
17 off_t offset, | |
18 size_t size, | |
19 bool read_only); | |
20 | |
21 SharedMemoryRegion(const media::BitstreamBuffer& bitstream_buffer, | |
22 bool read_only); | |
23 | |
24 // Maps the shared memory into the caller's address space. | |
25 // Return true on success, false otherwise. | |
26 bool Map(); | |
27 | |
28 // Gets a pointer to the mapped region if it has been mapped via Map(). | |
29 // Returns |nullptr| if it is not mapped. | |
30 void* memory(); | |
Pawel Osciak
2015/12/31 02:05:54
We should document how this relates to offset and
Owen Lin
2016/01/04 08:54:17
Done.
| |
31 | |
32 size_t size() const { return size_; } | |
33 | |
34 off_t offset() const { return offset_; } | |
Pawel Osciak
2015/12/31 02:05:53
Is this used anywhere?
Owen Lin
2016/01/04 08:54:17
No, let me remove it.
| |
35 | |
36 private: | |
37 base::SharedMemory shm_; | |
38 off_t offset_; | |
39 size_t size_; | |
40 | |
41 DISALLOW_COPY_AND_ASSIGN(SharedMemoryRegion); | |
42 }; | |
43 | |
44 } // namespace content | |
45 | |
46 #endif // CONTENT_COMMON_GPU_MEDIA_SHARED_MEMORY_REGION_H_ | |
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