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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 mozilla_layers_CompositorVsyncScheduler_h
+#define mozilla_layers_CompositorVsyncScheduler_h
+
+#include <stdint.h> // for uint64_t
+
+#include "mozilla/Attributes.h" // for override
+#include "mozilla/Monitor.h" // for Monitor
+#include "mozilla/RefPtr.h" // for RefPtr
+#include "mozilla/TimeStamp.h" // for TimeStamp
+#include "mozilla/gfx/Point.h" // for IntSize
+#include "mozilla/layers/SampleTime.h"
+#include "mozilla/webrender/webrender_ffi.h"
+#include "mozilla/VsyncDispatcher.h"
+#include "mozilla/widget/CompositorWidget.h"
+#include "nsISupportsImpl.h"
+
+namespace mozilla {
+
+class CancelableRunnable;
+class Runnable;
+
+namespace gfx {
+class DrawTarget;
+} // namespace gfx
+
+namespace layers {
+
+class CompositorVsyncSchedulerOwner;
+
+/**
+ * Manages the vsync (de)registration and tracking on behalf of the
+ * compositor when it need to paint.
+ * Turns vsync notifications into scheduled composites.
+ **/
+class CompositorVsyncScheduler {
+ NS_INLINE_DECL_THREADSAFE_REFCOUNTING(CompositorVsyncScheduler)
+
+ public:
+ CompositorVsyncScheduler(CompositorVsyncSchedulerOwner* aVsyncSchedulerOwner,
+ widget::CompositorWidget* aWidget);
+
+ /**
+ * Notify this class of a vsync. This will trigger a composite if one is
+ * needed. This must be called from the vsync dispatch thread.
+ */
+ void NotifyVsync(const VsyncEvent& aVsync);
+
+ /**
+ * Do cleanup. This must be called on the compositor thread.
+ */
+ void Destroy();
+
+ /**
+ * Notify this class that a composition is needed. This will trigger a
+ * composition soon (likely at the next vsync). This must be called on the
+ * compositor thread.
+ */
+ void ScheduleComposition(wr::RenderReasons aReasons);
+
+ /**
+ * Cancel any composite task that has been scheduled but hasn't run yet.
+ *
+ * Returns the render reasons of the canceled task if any.
+ */
+ wr::RenderReasons CancelCurrentCompositeTask();
+
+ /**
+ * Check if a composite is pending. This is generally true between a call
+ * to ScheduleComposition() and the time the composite happens.
+ */
+ bool NeedsComposite();
+
+ /**
+ * Force a composite to happen right away, without waiting for the next vsync.
+ * This must be called on the compositor thread.
+ */
+ void ForceComposeToTarget(wr::RenderReasons aReasons,
+ gfx::DrawTarget* aTarget,
+ const gfx::IntRect* aRect);
+
+ /**
+ * If a composite is pending, force it to trigger right away. This must be
+ * called on the compositor thread. Returns true if there was a composite
+ * flushed.
+ */
+ bool FlushPendingComposite();
+
+ /**
+ * Return the vsync timestamp of the last or ongoing composite. Must be called
+ * on the compositor thread.
+ */
+ const SampleTime& GetLastComposeTime() const;
+
+ /**
+ * Return the vsync timestamp and id of the most recently received
+ * vsync event. Must be called on the compositor thread.
+ */
+ const TimeStamp& GetLastVsyncTime() const;
+ const TimeStamp& GetLastVsyncOutputTime() const;
+ const VsyncId& GetLastVsyncId() const;
+
+ /**
+ * Update LastCompose TimeStamp to current timestamp.
+ * The function is typically used when composition is handled outside the
+ * CompositorVsyncScheduler.
+ */
+ void UpdateLastComposeTime();
+
+ private:
+ virtual ~CompositorVsyncScheduler();
+
+ // Post a task to run Composite() on the compositor thread, if there isn't
+ // such a task already queued. Can be called from any thread.
+ void PostCompositeTask(const VsyncEvent& aVsyncEvent,
+ wr::RenderReasons aReasons);
+
+ // Post a task to run DispatchVREvents() on the VR thread, if there isn't
+ // such a task already queued. Can be called from any thread.
+ void PostVRTask(TimeStamp aTimestamp);
+
+ /**
+ * Cancel any VR task that has been scheduled but hasn't run yet.
+ */
+ void CancelCurrentVRTask();
+
+ // This gets run at vsync time and "does" a composite (which really means
+ // update internal state and call the owner to do the composite).
+ void Composite(const VsyncEvent& aVsyncEvent, wr::RenderReasons aReasons);
+
+ void ObserveVsync();
+ void UnobserveVsync();
+
+ void DispatchVREvents(TimeStamp aVsyncTimestamp);
+
+ class Observer final : public VsyncObserver {
+ NS_INLINE_DECL_THREADSAFE_REFCOUNTING(CompositorVsyncScheduler::Observer,
+ override)
+
+ public:
+ explicit Observer(CompositorVsyncScheduler* aOwner);
+ void NotifyVsync(const VsyncEvent& aVsync) override;
+ void Destroy();
+
+ private:
+ virtual ~Observer();
+
+ Mutex mMutex MOZ_UNANNOTATED;
+ // Hold raw pointer to avoid mutual reference.
+ CompositorVsyncScheduler* mOwner;
+ };
+
+ CompositorVsyncSchedulerOwner* mVsyncSchedulerOwner;
+ SampleTime mLastComposeTime;
+ TimeStamp mLastVsyncTime;
+ TimeStamp mLastVsyncOutputTime;
+ VsyncId mLastVsyncId;
+
+ bool mAsapScheduling;
+ bool mIsObservingVsync;
+ // Accessed on the compositor thread.
+ wr::RenderReasons mRendersDelayedByVsyncReasons;
+ TimeStamp mCompositeRequestedAt;
+ int32_t mVsyncNotificationsSkipped;
+ widget::CompositorWidget* mWidget;
+ RefPtr<CompositorVsyncScheduler::Observer> mVsyncObserver;
+
+ mozilla::Monitor mCurrentCompositeTaskMonitor MOZ_UNANNOTATED;
+ RefPtr<CancelableRunnable> mCurrentCompositeTask;
+ // Accessed on multiple threads, guarded by mCurrentCompositeTaskMonitor.
+ wr::RenderReasons mCurrentCompositeTaskReasons;
+
+ mozilla::Monitor mCurrentVRTaskMonitor MOZ_UNANNOTATED;
+ RefPtr<CancelableRunnable> mCurrentVRTask;
+};
+
+} // namespace layers
+} // namespace mozilla
+
+#endif // mozilla_layers_CompositorVsyncScheduler_h