working copy of "zero_copy"

content/common/gpu/client/gpu_memory_buffer_impl_dma_buf.h

+// Copyright 2014 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 CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_DMA_BUF_H_
+#define CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_DMA_BUF_H_
+
+#include "content/common/gpu/client/gpu_memory_buffer_impl.h"
+struct gbm_bo;
+namespace content {
+class GBMWrapper;
+// Provides implementation of a GPU memory buffer based
+// on an Dma_buf handle.
+class GpuMemoryBufferImplDMABuf : public GpuMemoryBufferImpl {
+ public:
+  GpuMemoryBufferImplDMABuf(gfx::Size size, unsigned internalformat);
+  virtual ~GpuMemoryBufferImplDMABuf();
+
+  static bool IsFormatSupported(unsigned internalformat);
+
+  bool Initialize(gfx::GpuMemoryBufferHandle handle);
+
+  // Overridden from gfx::GpuMemoryBuffer:
+  virtual void* Map() OVERRIDE;
+  virtual void Unmap() OVERRIDE;
+  virtual gfx::GpuMemoryBufferHandle GetHandle() const OVERRIDE;
+  virtual uint32 GetStride() const OVERRIDE;
+
+ private:
+  int dma_buf_id_;
+  void* mapped_addr_;
+  uint32_t stride_;
+  struct gbm_bo* tex_bo_;
+  static GBMWrapper* wrapper_;
+  DISALLOW_COPY_AND_ASSIGN(GpuMemoryBufferImplDMABuf);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_DMA_BUF_H_