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// Copyright 2013 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 UI_GFX_GPU_MEMORY_BUFFER_H_
#define UI_GFX_GPU_MEMORY_BUFFER_H_
#include "base/memory/shared_memory.h"
#include "build/build_config.h"
#include "ui/gfx/gfx_export.h"
extern "C" typedef struct _ClientBuffer* ClientBuffer;
namespace gfx {
enum GpuMemoryBufferType {
EMPTY_BUFFER,
SHARED_MEMORY_BUFFER,
IO_SURFACE_BUFFER,
SURFACE_TEXTURE_BUFFER,
OZONE_NATIVE_BUFFER,
GPU_MEMORY_BUFFER_TYPE_LAST = OZONE_NATIVE_BUFFER
};
using GpuMemoryBufferId = int32;
struct GFX_EXPORT GpuMemoryBufferHandle {
GpuMemoryBufferHandle();
bool is_null() const { return type == EMPTY_BUFFER; }
GpuMemoryBufferType type;
GpuMemoryBufferId id;
base::SharedMemoryHandle handle;
#if defined(OS_MACOSX)
uint32 io_surface_id;
#endif
};
// This interface typically correspond to a type of shared memory that is also
// shared with the GPU. A GPU memory buffer can be written to directly by
// regular CPU code, but can also be read by the GPU.
class GFX_EXPORT GpuMemoryBuffer {
public:
// The format needs to be taken into account when mapping a buffer into the
// client's address space.
enum Format { RGBA_8888, RGBX_8888, BGRA_8888, FORMAT_LAST = BGRA_8888 };
// The usage mode affects how a buffer can be used. Only buffers created with
// MAP can be mapped into the client's address space and accessed by the CPU.
enum Usage { MAP, SCANOUT, USAGE_LAST = SCANOUT };
virtual ~GpuMemoryBuffer() {}
// Maps the buffer into the client's address space so it can be written to by
// the CPU. This call may block, for instance if the GPU needs to finish
// accessing the buffer or if CPU caches need to be synchronized. Returns NULL
// on failure.
virtual void* Map() = 0;
// Unmaps the buffer. It's illegal to use the pointer returned by Map() after
// this has been called.
virtual void Unmap() = 0;
// Returns true iff the buffer is mapped.
virtual bool IsMapped() const = 0;
// Returns the format for the buffer.
virtual Format GetFormat() const = 0;
// Returns the stride in bytes for the buffer.
virtual uint32 GetStride() const = 0;
// Returns a platform specific handle for this buffer.
virtual GpuMemoryBufferHandle GetHandle() const = 0;
// Type-checking downcast routine.
virtual ClientBuffer AsClientBuffer() = 0;
};
} // namespace gfx
#endif // UI_GFX_GPU_MEMORY_BUFFER_H_
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