ozone: Implement zero/one-copy texture for Ozone GBM.

content/common/gpu/client/gpu_memory_buffer_impl_ozone_native_buffer.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_OZONE_NATIVE_BUFFER_H_
 #define CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_OZONE_NATIVE_BUFFER_H_
 
 #include "content/common/gpu/client/gpu_memory_buffer_impl.h"
 
+struct gbm_bo;
+
 namespace content {
 
 // Implementation of GPU memory buffer based on Ozone native buffers.
 class GpuMemoryBufferImplOzoneNativeBuffer : public GpuMemoryBufferImpl {
  public:
   static scoped_ptr<GpuMemoryBufferImpl> CreateFromHandle(
       const gfx::GpuMemoryBufferHandle& handle,
       const gfx::Size& size,
       Format format,
       const DestructionCallback& callback);
 
+  ~GpuMemoryBufferImplOzoneNativeBuffer() override;
+
   // Overridden from gfx::GpuMemoryBuffer:
   bool Map(void** data) override;
   void Unmap() override;
   void GetStride(int* stride) const override;
   gfx::GpuMemoryBufferHandle GetHandle() const override;
 
  private:
   GpuMemoryBufferImplOzoneNativeBuffer(gfx::GpuMemoryBufferId id,
                                        const gfx::Size& size,
                                        Format format,
                                        const DestructionCallback& callback);
-  ~GpuMemoryBufferImplOzoneNativeBuffer() override;
+
+  bool Initialize(const gfx::GpuMemoryBufferHandle& handle);
+
+  uint32_t vgem_bo_handle_;
+  base::ScopedFD dma_buf_;
+  base::ScopedFD vgem_fd_;
+  size_t stride_;
+  void* mmap_ptr_;

[reveman, 2015/05/14 13:22:03]

Please move all this into ui/ozone/ and keep one opaque object here instead.
GpuMemoryBufferImplOzoneNativeBuffer is supposed to be a thin wrapper around an
ozone implementation and not contain any real logic.

Maybe use a NativePixmap here on the client side too or create some new type of
object.

SurfaceFactoryOzone::CreateNativePixmapFromHandle(base::FileDescriptor fd)
maybe..

[dshwang, 2015/05/14 14:58:15]

now I understand what you mean. It's very reasonable. I'll do it soon.

 
   DISALLOW_COPY_AND_ASSIGN(GpuMemoryBufferImplOzoneNativeBuffer);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_OZONE_NATIVE_BUFFER_H_