1// Copyright 2013 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 "content/common/gpu/client/gpu_memory_buffer_impl_shm.h"
6
7#include "base/logging.h"
8
9namespace content {
10
11GpuMemoryBufferImplShm::GpuMemoryBufferImplShm(
12    gfx::Size size, unsigned internalformat)
13    : GpuMemoryBufferImpl(size, internalformat) {
14}
15
16GpuMemoryBufferImplShm::~GpuMemoryBufferImplShm() {
17}
18
19bool GpuMemoryBufferImplShm::Initialize(gfx::GpuMemoryBufferHandle handle) {
20  if (!base::SharedMemory::IsHandleValid(handle.handle))
21    return false;
22  shared_memory_.reset(new base::SharedMemory(handle.handle, false));
23  DCHECK(!shared_memory_->memory());
24  return true;
25}
26
27bool GpuMemoryBufferImplShm::InitializeFromSharedMemory(
28    scoped_ptr<base::SharedMemory> shared_memory) {
29  shared_memory_ = shared_memory.Pass();
30  DCHECK(!shared_memory_->memory());
31  return true;
32}
33
34void GpuMemoryBufferImplShm::Map(AccessMode mode, void** vaddr) {
35  DCHECK(!mapped_);
36  *vaddr = NULL;
37  if (!shared_memory_->Map(size_.GetArea() * BytesPerPixel(internalformat_)))
38    return;
39  *vaddr = shared_memory_->memory();
40  mapped_ = true;
41}
42
43void GpuMemoryBufferImplShm::Unmap() {
44  DCHECK(mapped_);
45  shared_memory_->Unmap();
46  mapped_ = false;
47}
48
49gfx::GpuMemoryBufferHandle GpuMemoryBufferImplShm::GetHandle() const {
50  gfx::GpuMemoryBufferHandle handle;
51  handle.type = gfx::SHARED_MEMORY_BUFFER;
52  handle.handle = shared_memory_->handle();
53  return handle;
54}
55
56}  // namespace content
57