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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 WEBKIT_PLUGINS_PPAPI_PPB_BUFFER_IMPL_H_
#define WEBKIT_PLUGINS_PPAPI_PPB_BUFFER_IMPL_H_
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/shared_memory.h"
#include "ppapi/thunk/ppb_buffer_api.h"
#include "ppapi/shared_impl/resource.h"
#include "webkit/plugins/webkit_plugins_export.h"
namespace webkit {
namespace ppapi {
class WEBKIT_PLUGINS_EXPORT PPB_Buffer_Impl :
public ::ppapi::Resource,
public ::ppapi::thunk::PPB_Buffer_API {
public:
virtual ~PPB_Buffer_Impl();
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.
virtual ::ppapi::thunk::PPB_Buffer_API* AsPPB_Buffer_API() OVERRIDE;
// PPB_Buffer_API implementation.
virtual PP_Bool Describe(uint32_t* size_in_bytes) OVERRIDE;
virtual PP_Bool IsMapped() OVERRIDE;
virtual void* Map() OVERRIDE;
virtual void Unmap() OVERRIDE;
// Trusted.
virtual int32_t GetSharedMemory(int* handle) OVERRIDE;
private:
explicit PPB_Buffer_Impl(PP_Instance instance);
bool Init(uint32_t size);
scoped_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 ppapi
} // namespace webkit
#endif // WEBKIT_PLUGINS_PPAPI_PPB_BUFFER_IMPL_H_
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