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// Copyright 2015 The Chromium Authors
// 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 <memory>
#include "base/memory/unsafe_shared_memory_region.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::UnsafeSharedMemoryRegion with functionality to create buffers from the
// memory to use for display.
class SharedMemory {
public:
explicit SharedMemory(base::UnsafeSharedMemoryRegion shared_memory_region);
SharedMemory(const SharedMemory&) = delete;
SharedMemory& operator=(const SharedMemory&) = delete;
~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.
std::unique_ptr<Buffer> CreateBuffer(const gfx::Size& size,
gfx::BufferFormat format,
unsigned offset,
uint32_t stride);
size_t GetSize() const;
bool Resize(const size_t new_size);
private:
base::UnsafeSharedMemoryRegion shared_memory_region_;
};
} // namespace exo
#endif // COMPONENTS_EXO_SHARED_MEMORY_H_
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