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

ui/ozone/platform/drm/gpu/vgem_pixmap.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 UI_OZONE_PLATFORM_DRM_GPU_VGEM_BUFFER_H_
+#define UI_OZONE_PLATFORM_DRM_GPU_VGEM_BUFFER_H_
+
+#include "ui/ozone/public/native_pixmap.h"
+#include "ui/ozone/public/surface_factory_ozone.h"
+
+namespace ui {
+
+class VgemPixmap : public NativePixmap {
+ public:
+  VgemPixmap(base::FileDescriptor handle,
+             base::FileDescriptor vgem_handle,
+             gfx::Size size,
+             SurfaceFactoryOzone::BufferFormat format,
+             BufferUsage usage);
+  bool Initialize();
+
+  // NativePixmap:
+  void* GetEGLClientBuffer() override;
+  int GetDmaBufFd() override;
+  int GetDmaBufPitch() override;
+  BufferUsage GetBufferUsage() const override;
+  void* Map() override;
+  void Unmap() override;
+
+ protected:
+  ~VgemPixmap() override;
+
+ private:
+  uint32_t vgem_bo_handle_;
+  base::ScopedFD dma_buf_;
+  base::FileDescriptor vgem_fd_;
+  gfx::Size size_;
+  SurfaceFactoryOzone::BufferFormat format_;
+  BufferUsage usage_;
+  size_t stride_;
+  void* mmap_ptr_;
+
+  DISALLOW_COPY_AND_ASSIGN(VgemPixmap);
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PLATFORM_DRM_GPU_VGEM_BUFFER_H_