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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,
IO_SURFACE_BUFFER,
ANDROID_NATIVE_BUFFER,
SURFACE_TEXTURE_BUFFER,
GPU_MEMORY_BUFFER_TYPE_LAST = SURFACE_TEXTURE_BUFFER
};
#if defined(OS_ANDROID)
struct SurfaceTextureId {
SurfaceTextureId() : primary_id(0), secondary_id(0) {}
SurfaceTextureId(int32 primary_id, int32 secondary_id)
: primary_id(primary_id), secondary_id(secondary_id) {}
int32 primary_id;
int32 secondary_id;
};
#endif
struct GpuMemoryBufferHandle {
GpuMemoryBufferHandle()
: type(EMPTY_BUFFER),
handle(base::SharedMemory::NULLHandle())
#if defined(OS_MACOSX)
,
io_surface_id(0u)
#endif
#if defined(OS_ANDROID)
,
native_buffer(NULL)
#endif
{
}
bool is_null() const { return type == EMPTY_BUFFER; }
GpuMemoryBufferType type;
base::SharedMemoryHandle handle;
#if defined(OS_MACOSX)
uint32 io_surface_id;
#endif
#if defined(OS_ANDROID)
EGLClientBuffer native_buffer;
SurfaceTextureId surface_texture_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:
enum AccessMode { READ_ONLY, WRITE_ONLY, READ_WRITE };
GpuMemoryBuffer();
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. |mode|
// indicate how the client intends to use the mapped buffer. Returns NULL on
// failure.
virtual void* Map(AccessMode mode) = 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 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_
|
