File indexing completed on 2024-05-12 05:32:16

 /*
     SPDX-FileCopyrightText: 2020 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #pragma once
 
 #include "utils/vsyncmonitor.h"
 
 #include <QTimer>
 #include <memory>
 
 namespace KWin
 {
 
 /**
  * The SoftwareVsyncMonitor class provides synthetic vblank events with constant interval.
  *
  * The software vsync monitor can never fail and it is always available. It can be used as
  * fallback if hardware based approaches to monitor vsync events are unavailable.
  *
  * The vblank interval can be changed by calling the setRefreshRate() function.
  */
 class KWIN_EXPORT SoftwareVsyncMonitor : public VsyncMonitor
 {
     Q_OBJECT
 
 public:
     static std::unique_ptr<SoftwareVsyncMonitor> create();
 
     int refreshRate() const;
     void setRefreshRate(int refreshRate);
 
 public Q_SLOTS:
     void arm() override;
 
 private:
     explicit SoftwareVsyncMonitor();
     void handleSyntheticVsync();
 
     QTimer m_softwareClock;
     int m_refreshRate = 60000;
     std::chrono::nanoseconds m_vblankTimestamp = std::chrono::nanoseconds::zero();
 };
 
 } // namespace KWin