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// Copyright 2015 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 COMPONENTS_EXO_SHARED_MEMORY_H_
#define COMPONENTS_EXO_SHARED_MEMORY_H_
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/shared_memory.h"
#include "ui/gfx/buffer_types.h"
#include "ui/gfx/geometry/size.h"
namespace exo {
class Buffer;
// Shared memory abstraction. Provides a wrapper around base::SharedMemory
// with functionality to create buffers from the memory to use for display.
class SharedMemory {
public:
explicit SharedMemory(const base::SharedMemoryHandle& handle);
~SharedMemory();
// Creates a buffer from the shared memory. The buffer is created offset bytes
// into the memory and has width and height as specified. The stride
// arguments specifies the number of bytes from beginning of one row to the
// beginning of the next. The format is the pixel format of the buffer and
// must be one of RGBX_8888, RGBA_8888, BGRX_8888, BGRA_8888.
scoped_ptr<Buffer> CreateBuffer(const gfx::Size& size,
gfx::BufferFormat format,
unsigned offset,
int stride);
private:
base::SharedMemory shared_memory_;
DISALLOW_COPY_AND_ASSIGN(SharedMemory);
};
} // namespace exo
#endif // COMPONENTS_EXO_SHARED_MEMORY_H_
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