1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "gpu/command_buffer/common/buffer.h"
#include "base/logging.h"
#include "base/numerics/safe_math.h"
namespace gpu {
SharedMemoryBufferBacking::SharedMemoryBufferBacking(
scoped_ptr<base::SharedMemory> shared_memory,
size_t size)
: shared_memory_(shared_memory.Pass()), size_(size) {}
SharedMemoryBufferBacking::~SharedMemoryBufferBacking() {}
void* SharedMemoryBufferBacking::GetMemory() const {
return shared_memory_->memory();
}
size_t SharedMemoryBufferBacking::GetSize() const { return size_; }
Buffer::Buffer(scoped_ptr<BufferBacking> backing)
: backing_(backing.Pass()),
memory_(backing_->GetMemory()),
size_(backing_->GetSize()) {
DCHECK(memory_) << "The memory must be mapped to create a Buffer";
}
Buffer::~Buffer() {}
void* Buffer::GetDataAddress(uint32 data_offset, uint32 data_size) const {
base::CheckedNumeric<uint32> end = data_offset;
end += data_size;
if (!end.IsValid() || end.ValueOrDie() > static_cast<uint32>(size_))
return NULL;
return static_cast<uint8*>(memory_) + data_offset;
}
} // namespace gpu
|
