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// Copyright (c) 2012 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 "content/renderer/pepper/ppb_buffer_impl.h"
#include <algorithm>
#include <memory>
#include "base/logging.h"
#include "content/common/pepper_file_util.h"
#include "content/renderer/render_thread_impl.h"
#include "ppapi/c/dev/ppb_buffer_dev.h"
#include "ppapi/c/pp_bool.h"
#include "ppapi/c/pp_errors.h"
#include "ppapi/c/pp_instance.h"
#include "ppapi/c/pp_resource.h"
using ppapi::thunk::PPB_Buffer_API;
namespace content {
PPB_Buffer_Impl::PPB_Buffer_Impl(PP_Instance instance)
: Resource(ppapi::OBJECT_IS_IMPL, instance), size_(0), map_count_(0) {}
PPB_Buffer_Impl::~PPB_Buffer_Impl() {}
// static
PP_Resource PPB_Buffer_Impl::Create(PP_Instance instance, uint32_t size) {
scoped_refptr<PPB_Buffer_Impl> new_resource(CreateResource(instance, size));
if (new_resource.get())
return new_resource->GetReference();
return 0;
}
// static
scoped_refptr<PPB_Buffer_Impl> PPB_Buffer_Impl::CreateResource(
PP_Instance instance,
uint32_t size) {
scoped_refptr<PPB_Buffer_Impl> buffer(new PPB_Buffer_Impl(instance));
if (!buffer->Init(size))
return scoped_refptr<PPB_Buffer_Impl>();
return buffer;
}
PPB_Buffer_Impl* PPB_Buffer_Impl::AsPPB_Buffer_Impl() { return this; }
PPB_Buffer_API* PPB_Buffer_Impl::AsPPB_Buffer_API() { return this; }
bool PPB_Buffer_Impl::Init(uint32_t size) {
if (size == 0)
return false;
size_ = size;
shared_memory_.reset(
RenderThread::Get()->HostAllocateSharedMemoryBuffer(size).release());
return shared_memory_.get() != nullptr;
}
PP_Bool PPB_Buffer_Impl::Describe(uint32_t* size_in_bytes) {
*size_in_bytes = size_;
return PP_TRUE;
}
PP_Bool PPB_Buffer_Impl::IsMapped() {
return PP_FromBool(!!shared_memory_->memory());
}
void* PPB_Buffer_Impl::Map() {
DCHECK(size_);
DCHECK(shared_memory_.get());
if (map_count_++ == 0)
shared_memory_->Map(size_);
return shared_memory_->memory();
}
void PPB_Buffer_Impl::Unmap() {
if (--map_count_ == 0)
shared_memory_->Unmap();
}
int32_t PPB_Buffer_Impl::GetSharedMemory(base::SharedMemory** shm) {
*shm = shared_memory_.get();
return PP_OK;
}
BufferAutoMapper::BufferAutoMapper(PPB_Buffer_API* api) : api_(api) {
needs_unmap_ = !PP_ToBool(api->IsMapped());
data_ = api->Map();
api->Describe(&size_);
}
BufferAutoMapper::~BufferAutoMapper() {
if (needs_unmap_)
api_->Unmap();
}
} // namespace content
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