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+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef GFX_SOFTWARE_VSYNC_SOURCE_H
+#define GFX_SOFTWARE_VSYNC_SOURCE_H
+
+#include "mozilla/DataMutex.h"
+#include "mozilla/Monitor.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/TimeStamp.h"
+#include "base/thread.h"
+#include "nsISupportsImpl.h"
+#include "VsyncSource.h"
+
+namespace mozilla::gfx {
+
+// Fallback option to use a software timer to mimic vsync. Useful for gtests
+// To mimic a hardware vsync thread, we create a dedicated software timer
+// vsync thread.
+class SoftwareVsyncSource : public VsyncSource {
+ public:
+ explicit SoftwareVsyncSource(const TimeDuration& aInitialVsyncRate);
+ virtual ~SoftwareVsyncSource();
+
+ void EnableVsync() override;
+ void DisableVsync() override;
+ bool IsVsyncEnabled() override;
+ bool IsInSoftwareVsyncThread();
+ void NotifyVsync(const TimeStamp& aVsyncTimestamp,
+ const TimeStamp& aOutputTimestamp) override;
+ TimeDuration GetVsyncRate() override;
+ void ScheduleNextVsync(TimeStamp aVsyncTimestamp);
+ void Shutdown() override;
+
+ // Can be called on any thread
+ void SetVsyncRate(const TimeDuration& aNewRate);
+
+ protected:
+ // Use a chromium thread because nsITimers* fire on the main thread
+ base::Thread* mVsyncThread;
+ RefPtr<CancelableRunnable> mCurrentVsyncTask; // only access on vsync thread
+ bool mVsyncEnabled; // Only access on main thread
+
+ private:
+ DataMutex<TimeDuration> mVsyncRate; // can be accessed on any thread
+};
+
+} // namespace mozilla::gfx
+
+#endif /* GFX_SOFTWARE_VSYNC_SOURCE_H */