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// Copyright (c) 2011 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.
#ifndef CONTENT_RENDERER_PEPPER_PPB_BUFFER_IMPL_H_
#define CONTENT_RENDERER_PEPPER_PPB_BUFFER_IMPL_H_
#include <stdint.h>
#include <memory>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/shared_memory.h"
#include "ppapi/shared_impl/resource.h"
#include "ppapi/thunk/ppb_buffer_api.h"
namespace content {
class PPB_Buffer_Impl : public ppapi::Resource,
public ppapi::thunk::PPB_Buffer_API {
public:
static PP_Resource Create(PP_Instance instance, uint32_t size);
static scoped_refptr<PPB_Buffer_Impl> CreateResource(PP_Instance instance,
uint32_t size);
virtual PPB_Buffer_Impl* AsPPB_Buffer_Impl();
base::SharedMemory* shared_memory() const { return shared_memory_.get(); }
uint32_t size() const { return size_; }
// Resource overrides.
ppapi::thunk::PPB_Buffer_API* AsPPB_Buffer_API() override;
// PPB_Buffer_API implementation.
PP_Bool Describe(uint32_t* size_in_bytes) override;
PP_Bool IsMapped() override;
void* Map() override;
void Unmap() override;
// Trusted.
int32_t GetSharedMemory(base::SharedMemory** shm) override;
private:
~PPB_Buffer_Impl() override;
explicit PPB_Buffer_Impl(PP_Instance instance);
bool Init(uint32_t size);
std::unique_ptr<base::SharedMemory> shared_memory_;
uint32_t size_;
int map_count_;
DISALLOW_COPY_AND_ASSIGN(PPB_Buffer_Impl);
};
// Ensures that the given buffer is mapped, and returns it to its previous
// mapped state in the destructor.
class BufferAutoMapper {
public:
explicit BufferAutoMapper(ppapi::thunk::PPB_Buffer_API* api);
~BufferAutoMapper();
// Will be NULL on failure to map.
void* data() { return data_; }
uint32_t size() { return size_; }
private:
ppapi::thunk::PPB_Buffer_API* api_;
bool needs_unmap_;
void* data_;
uint32_t size_;
DISALLOW_COPY_AND_ASSIGN(BufferAutoMapper);
};
} // namespace content
#endif // CONTENT_RENDERER_PEPPER_PPB_BUFFER_IMPL_H_
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