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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"
#if defined(OS_ANDROID)
#include <third_party/khronos/EGL/egl.h>
#endif
namespace gfx {
enum GpuMemoryBufferType {
EMPTY_BUFFER,
SHARED_MEMORY_BUFFER,
EGL_CLIENT_BUFFER
};
struct GpuMemoryBufferHandle {
GpuMemoryBufferHandle()
: type(EMPTY_BUFFER),
handle(base::SharedMemory::NULLHandle())
#if defined(OS_ANDROID)
, native_buffer(NULL)
#endif
{
}
bool is_null() const { return type == EMPTY_BUFFER; }
GpuMemoryBufferType type;
base::SharedMemoryHandle handle;
#if defined(OS_ANDROID)
EGLClientBuffer native_buffer;
#endif
};
// Interface for creating and accessing a zero-copy GPU memory buffer.
// This design evolved from the generalization of GraphicBuffer API
// of Android framework.
//
// THREADING CONSIDERATIONS:
//
// This interface is thread-safe. However, multiple threads mapping
// a buffer for Write or ReadOrWrite simultaneously may result in undefined
// behavior and is not allowed.
class UI_EXPORT GpuMemoryBuffer {
public:
enum AccessMode {
READ_ONLY,
WRITE_ONLY,
READ_WRITE,
};
GpuMemoryBuffer();
virtual ~GpuMemoryBuffer();
// Maps the buffer so the client can write the bitmap data in |*vaddr|
// subsequently. This call may block, for instance if the hardware needs
// to finish rendering or if CPU caches need to be synchronized.
virtual void Map(AccessMode mode, void** vaddr) = 0;
// Unmaps the buffer. Called after all changes to the buffer are
// completed.
virtual void Unmap() = 0;
// Returns true iff the buffer is mapped.
virtual bool IsMapped() 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;
};
} // namespace gfx
#endif // UI_GFX_GPU_MEMORY_BUFFER_H_
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