[Ozone-DRI] Listen for swap events

ui/ozone/platform/dri/crtc_controller.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_CRTC_CONTROLLER_H_
 #define UI_OZONE_PLATFORM_DRI_CRTC_CONTROLLER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 #include <xf86drmMode.h>
 
+#include "base/memory/weak_ptr.h"
+#include "base/observer_list.h"
 #include "ui/ozone/platform/dri/hardware_display_plane_manager.h"
 #include "ui/ozone/platform/dri/overlay_plane.h"
 #include "ui/ozone/platform/dri/scoped_drm_types.h"
 
 namespace ui {
 
 class DriWrapper;
+class PageFlipObserver;
 
 // Wrapper around a CRTC.
 //
 // One CRTC can be paired up with one or more connectors. The simplest
 // configuration represents one CRTC driving one monitor, while pairing up a
 // CRTC with multiple connectors results in hardware mirroring.
-class CrtcController {
+class CrtcController : public base::SupportsWeakPtr<CrtcController> {
  public:
   CrtcController(DriWrapper* drm, uint32_t crtc, uint32_t connector);
   ~CrtcController();
 
   uint32_t crtc() const { return crtc_; }
   uint32_t connector() const { return connector_; }
   DriWrapper* drm() const { return drm_; }
   bool is_disabled() const { return is_disabled_; }
   bool page_flip_pending() const { return page_flip_pending_; }
   uint64_t time_of_last_flip() const { return time_of_last_flip_; }
@@ skipping 21 matching lines @@
   // represents the number of seconds while |useconds| represents the
   // microseconds (< 1 second) in the timestamp.
   void OnPageFlipEvent(unsigned int frame,
                        unsigned int seconds,
                        unsigned int useconds);
 
   bool SetCursor(const scoped_refptr<ScanoutBuffer>& buffer);
   bool UnsetCursor();
   bool MoveCursor(const gfx::Point& location);
 
+  void AddObserver(PageFlipObserver* observer);

[dnicoara, 2015/01/08 15:31:37]

This seemed good at the beginning, but now I feel like a callback on
SchedulePageFlip() will be simpler.

+  void RemoveObserver(PageFlipObserver* observer);
+
  private:
   DriWrapper* drm_;  // Not owned.
 
   HardwareDisplayPlaneManager* overlay_plane_manager_;  // Not owned.
 
   // Buffers need to be declared first so that they are destroyed last. Needed
   // since the controllers may reference the buffers.
   OverlayPlaneList current_planes_;
   OverlayPlaneList pending_planes_;
   scoped_refptr<ScanoutBuffer> cursor_buffer_;
@@ skipping 13 matching lines @@
   // is set to false. Otherwise it is true.
   bool is_disabled_;
 
   // True if a successful SchedulePageFlip occurred. Reset to false by a modeset
   // operation or when the OnPageFlipEvent callback is triggered.
   bool page_flip_pending_;
 
   // The time of the last page flip event as reported by the kernel callback.
   uint64_t time_of_last_flip_;
 
+  ObserverList<PageFlipObserver> observers_;
+
   DISALLOW_COPY_AND_ASSIGN(CrtcController);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRI_CRTC_CONTROLLER_H_