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1 // Copyright (c) 2015 The Chromium Authors. All rights reserved. | |
kcwu
2016/03/16 06:20:53
s/(c) 2015/2016/
| |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "base/sys_info.h" | |
6 #include "content/common/gpu/media/shared_memory_region.h" | |
7 | |
8 namespace content { | |
9 | |
10 SharedMemoryRegion::SharedMemoryRegion(const base::SharedMemoryHandle& handle, | |
11 off_t offset, | |
12 size_t size, | |
13 bool read_only) | |
14 : shm_(handle, read_only), | |
15 offset_(offset), | |
16 size_(size), | |
17 alignment_size_(offset % base::SysInfo::VMAllocationGranularity()) { | |
kcwu
2016/03/16 06:20:53
How about name it |offset_to_alignment| or |paddin
| |
18 DCHECK_GE(offset_, 0) << "Invalid offset: " << offset_; | |
19 } | |
20 | |
21 SharedMemoryRegion::SharedMemoryRegion( | |
22 const media::BitstreamBuffer& bitstream_buffer, | |
23 bool read_only) | |
24 : SharedMemoryRegion(bitstream_buffer.handle(), | |
25 bitstream_buffer.offset(), | |
26 bitstream_buffer.size(), | |
27 read_only) {} | |
28 | |
29 bool SharedMemoryRegion::Map() { | |
30 if (offset_ < 0) { | |
31 DVLOG(1) << "Invalid offset: " << offset_; | |
32 return false; | |
33 } | |
34 return shm_.MapAt(offset_ - alignment_size_, size_ + alignment_size_); | |
35 } | |
36 | |
37 void* SharedMemoryRegion::memory() { | |
38 int8_t* addr = reinterpret_cast<int8_t*>(shm_.memory()); | |
39 return addr ? addr + alignment_size_ : nullptr; | |
40 } | |
41 | |
42 } // namespace content | |
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