1// Copyright (c) 2012 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/renderer/pepper/ppb_buffer_impl.h"
6
7#include <algorithm>
8
9#include "base/logging.h"
10#include "base/memory/scoped_ptr.h"
11#include "content/renderer/pepper/common.h"
12#include "content/renderer/render_thread_impl.h"
13#include "ppapi/c/dev/ppb_buffer_dev.h"
14#include "ppapi/c/pp_errors.h"
15#include "ppapi/c/pp_instance.h"
16#include "ppapi/c/pp_resource.h"
17
18using ppapi::thunk::PPB_Buffer_API;
19
20namespace content {
21
22PPB_Buffer_Impl::PPB_Buffer_Impl(PP_Instance instance)
23    : Resource(ppapi::OBJECT_IS_IMPL, instance), size_(0), map_count_(0) {}
24
25PPB_Buffer_Impl::~PPB_Buffer_Impl() {}
26
27// static
28PP_Resource PPB_Buffer_Impl::Create(PP_Instance instance, uint32_t size) {
29  scoped_refptr<PPB_Buffer_Impl> new_resource(CreateResource(instance, size));
30  if (new_resource.get())
31    return new_resource->GetReference();
32  return 0;
33}
34
35// static
36scoped_refptr<PPB_Buffer_Impl> PPB_Buffer_Impl::CreateResource(
37    PP_Instance instance,
38    uint32_t size) {
39  scoped_refptr<PPB_Buffer_Impl> buffer(new PPB_Buffer_Impl(instance));
40  if (!buffer->Init(size))
41    return scoped_refptr<PPB_Buffer_Impl>();
42  return buffer;
43}
44
45PPB_Buffer_Impl* PPB_Buffer_Impl::AsPPB_Buffer_Impl() { return this; }
46
47PPB_Buffer_API* PPB_Buffer_Impl::AsPPB_Buffer_API() { return this; }
48
49bool PPB_Buffer_Impl::Init(uint32_t size) {
50  if (size == 0)
51    return false;
52  size_ = size;
53  shared_memory_.reset(
54      RenderThread::Get()->HostAllocateSharedMemoryBuffer(size).release());
55  return shared_memory_.get() != NULL;
56}
57
58PP_Bool PPB_Buffer_Impl::Describe(uint32_t* size_in_bytes) {
59  *size_in_bytes = size_;
60  return PP_TRUE;
61}
62
63PP_Bool PPB_Buffer_Impl::IsMapped() {
64  return PP_FromBool(!!shared_memory_->memory());
65}
66
67void* PPB_Buffer_Impl::Map() {
68  DCHECK(size_);
69  DCHECK(shared_memory_.get());
70  if (map_count_++ == 0)
71    shared_memory_->Map(size_);
72  return shared_memory_->memory();
73}
74
75void PPB_Buffer_Impl::Unmap() {
76  if (--map_count_ == 0)
77    shared_memory_->Unmap();
78}
79
80int32_t PPB_Buffer_Impl::GetSharedMemory(int* shm_handle) {
81#if defined(OS_POSIX)
82  *shm_handle = shared_memory_->handle().fd;
83#elif defined(OS_WIN)
84  *shm_handle = reinterpret_cast<int>(shared_memory_->handle());
85#else
86#error "Platform not supported."
87#endif
88  return PP_OK;
89}
90
91BufferAutoMapper::BufferAutoMapper(PPB_Buffer_API* api) : api_(api) {
92  needs_unmap_ = !PP_ToBool(api->IsMapped());
93  data_ = api->Map();
94  api->Describe(&size_);
95}
96
97BufferAutoMapper::~BufferAutoMapper() {
98  if (needs_unmap_)
99    api_->Unmap();
100}
101
102}  // namespace content
103