[Ozone-DRI] Remove unneeded wrappers

ui/ozone/platform/dri/scanout_surface.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_DRI_SCANOUT_SURFACE_H_
-#define UI_OZONE_PLATFORM_DRI_SCANOUT_SURFACE_H_
-
-#include <stdint.h>
-
-namespace gfx {
-class Size;
-}
-
-namespace ui {
-
-// ScanoutSurface is an interface for a surface that can be scanned out to a
-// monitor using the DRM/KMS API. Implementations will store the internal state
-// associated with the drawing surface. Implementations are also required to
-// performs all the needed operations to initialize and update the drawing
-// surface.
-//
-// The typical usage pattern is:
-// -----------------------------------------------------------------------------
-// HardwareDisplayController controller;
-// // Initialize controller
-//
-// ScanoutSurface* surface = new ScanoutSurfaceImpl(size);
-// surface.Initialize();
-// controller.BindSurfaceToController(surface);
-//
-// while (true) {
-//   DrawIntoSurface(surface);
-//   controller.SchedulePageFlip();
-//
-//   Wait for page flip event. The DRM page flip handler will call
-//   surface.SwapBuffers();
-// }
-//
-// delete surface;
-// -----------------------------------------------------------------------------
-// In the above example the wait consists of reading a DRM pageflip event from
-// the graphics card file descriptor. This is done by calling |drmHandleEvent|,
-// which will read and process the event. |drmHandleEvent| will call a callback
-// registered by |SchedulePageFlip| which will update the internal state.
-//
-// |SchedulePageFlip| can also be used to limit drawing to the screen's vsync
-// since page flips only happen on vsync. In a threaded environment a message
-// loop would listen on the graphics card file descriptor for an event and
-// |drmHandleEvent| would be called from the message loop. The event handler
-// would also be responsible for updating the renderer's state and signal that
-// it is OK to start drawing the next frame.
-class ScanoutSurface {
- public:
-  virtual ~ScanoutSurface() {}
-
-  // Used to allocate all necessary buffers for this surface. If the
-  // initialization succeeds, the device is ready to be used for drawing
-  // operations.
-  // Returns true if the initialization is successful, false otherwise.
-  virtual bool Initialize() = 0;
-
-  // Prepare the surface to be displayed.
-  virtual void PreSwapBuffers() = 0;
-
-  // Swaps the back buffer with the front buffer.
-  virtual void SwapBuffers() = 0;
-
-  // Returns the ID of the current backbuffer.
-  virtual uint32_t GetFramebufferId() const = 0;
-
-  // Returns the handle of the current backbuffer.
-  virtual uint32_t GetHandle() const = 0;
-
-  // Returns the surface size.
-  virtual gfx::Size Size() const = 0;
-};
-
-class ScanoutSurfaceGenerator {
- public:
-  virtual ~ScanoutSurfaceGenerator() {}
-
-  virtual ScanoutSurface* Create(const gfx::Size& size) = 0;
-};
-
-}  // namespace ui
-
-#endif  // UI_OZONE_PLATFORM_DRI_SCANOUT_SURFACE_H_