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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 #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 extra_size_(offset % base::SysInfo::VMAllocationGranularity()) { | |
18 DCHECK_LT(offset_, 0) << "Invalid offset: " << offset_; | |
Pawel Osciak
2016/01/05 06:22:51
DCHECK_GE ?
Owen Lin
2016/01/06 03:45:46
Done.
| |
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 return shm_.MapAt(offset_ - extra_size_, size_ + extra_size_); | |
Pawel Osciak
2016/01/05 06:22:51
I'm wondering, if offset is < 0, then extra_size_
Owen Lin
2016/01/06 03:45:46
Done.
| |
31 } | |
32 | |
33 void* SharedMemoryRegion::memory() { | |
34 int8_t* addr = reinterpret_cast<int8_t*>(shm_.memory()); | |
35 return addr ? addr + extra_size_ : nullptr; | |
36 } | |
37 | |
38 } // namespace content | |
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