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/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);
+
+  ~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,
+                         uint32_t vgem_bo_handle);
+
+  base::ScopedFD dma_buf_;
+  base::FileDescriptor vgem_fd_;
+  gfx::Size size_;
+  uint32_t vgem_bo_handle_;
+  int stride_;
+  void* data_;

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

can some of these members be const?

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

good point. all except for |data_|. Done.

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