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

ui/ozone/platform/drm/gpu/client_native_pixmap_vgem.h

+// Copyright 2015 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_OZONE_PLATFORM_DRM_GPU_CLIENT_NATIVE_PIXMAP_VGEM_H_
+#define UI_OZONE_PLATFORM_DRM_GPU_CLIENT_NATIVE_PIXMAP_VGEM_H_
+
+#include "base/file_descriptor_posix.h"
+#include "ui/gfx/buffer_types.h"
+#include "ui/gfx/geometry/size.h"
+#include "ui/gfx/native_pixmap_handle_ozone.h"
+#include "ui/ozone/public/client_native_pixmap.h"
+
+namespace ui {
+
+class ClientNativePixmapVgem : public ClientNativePixmap {
+ public:
+  static scoped_ptr<ClientNativePixmap> Create(
+      const gfx::NativePixmapHandle& handle,
+      const base::FileDescriptor& vgem_handle,
+      const gfx::Size& size,
+      gfx::BufferFormat format,
+      gfx::BufferUsage usage);
+
+  ~ClientNativePixmapVgem() override;
+
+  // Overridden from ClientNativePixmap.
+  bool Map(void** data) override;
+  void Unmap() override;
+  void GetStride(int* stride) const override;
+
+ private:
+  ClientNativePixmapVgem(const gfx::NativePixmapHandle& handle,
+                         const base::FileDescriptor& vgem_handle,
+                         const gfx::Size& size,
+                         gfx::BufferFormat format,
+                         gfx::BufferUsage usage,
+                         uint32_t vgem_bo_handle);
+
+  base::ScopedFD dma_buf_;

[reveman, 2015/08/07 14:35:16]

what is this used for?

[dshwang, 2015/08/07 15:36:46]

Client should keep dmabuf fd and close it after vgem bo handle is closed.

[reveman, 2015/08/07 17:59:44]

drmPrimeFDToHandle doesn't dup the fd? That's a bit weird. Maybe wrap the bo
handle in a class that makes sure that's case

[dshwang, 2015/08/11 17:44:56]

you are right. Don't need to keep dmabuf fd. removed this member.

+  base::FileDescriptor vgem_fd_;
+  gfx::Size size_;
+  gfx::BufferFormat format_;

[reveman, 2015/08/07 14:35:16]

where is this used?

[dshwang, 2015/08/07 15:36:46]

Removed.

+  gfx::BufferUsage usage_;

[reveman, 2015/08/07 14:35:16]

what do we need this for?

[dshwang, 2015/08/07 15:36:46]

Removed.

+  uint32_t vgem_bo_handle_;
+  int stride_;
+  void* mmap_ptr_;

[reveman, 2015/08/07 14:35:16]

s/mmap_ptr_/data_/ ?

[dshwang, 2015/08/07 15:36:46]

Done.

+
+  DISALLOW_COPY_AND_ASSIGN(ClientNativePixmapVgem);
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PLATFORM_DRM_GPU_CLIENT_NATIVE_PIXMAP_VGEM_H_