Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 691 insertions, 0 deletions

diff --git a/dom/animation/Animation.h b/dom/animation/Animation.h
new file mode 100644
index 0000000000..8a5146d62b
--- /dev/null
+++ b/dom/animation/Animation.h
@@ -0,0 +1,691 @@
+/* -*- 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_dom_Animation_h
+#define mozilla_dom_Animation_h
+
+#include "X11UndefineNone.h"
+#include "nsCycleCollectionParticipant.h"
+#include "mozilla/AnimationPerformanceWarning.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/BasePrincipal.h"
+#include "mozilla/DOMEventTargetHelper.h"
+#include "mozilla/EffectCompositor.h"  // For EffectCompositor::CascadeLevel
+#include "mozilla/LinkedList.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/PostRestyleMode.h"
+#include "mozilla/StickyTimeDuration.h"
+#include "mozilla/TimeStamp.h"             // for TimeStamp, TimeDuration
+#include "mozilla/dom/AnimationBinding.h"  // for AnimationPlayState
+#include "mozilla/dom/AnimationTimeline.h"
+
+struct JSContext;
+class nsCSSPropertyIDSet;
+class nsIFrame;
+class nsIGlobalObject;
+
+namespace mozilla {
+
+struct AnimationRule;
+class MicroTaskRunnable;
+
+namespace dom {
+
+class AnimationEffect;
+class AsyncFinishNotification;
+class CSSAnimation;
+class CSSTransition;
+class Document;
+class Promise;
+
+class Animation : public DOMEventTargetHelper,
+                  public LinkedListElement<Animation> {
+ protected:
+  virtual ~Animation();
+
+ public:
+  explicit Animation(nsIGlobalObject* aGlobal);
+
+  // Constructs a copy of |aOther| with a new effect and timeline.
+  // This is only intended to be used while making a static clone of a document
+  // during printing, and does not assume that |aOther| is in the same document
+  // as any of the other arguments.
+  static already_AddRefed<Animation> ClonePausedAnimation(
+      nsIGlobalObject* aGlobal, const Animation& aOther,
+      AnimationEffect& aEffect, AnimationTimeline& aTimeline);
+
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(Animation, DOMEventTargetHelper)
+
+  nsIGlobalObject* GetParentObject() const { return GetOwnerGlobal(); }
+
+  /**
+   * Utility function to get the target (pseudo-)element associated with an
+   * animation.
+   */
+  NonOwningAnimationTarget GetTargetForAnimation() const;
+
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  virtual CSSAnimation* AsCSSAnimation() { return nullptr; }
+  virtual const CSSAnimation* AsCSSAnimation() const { return nullptr; }
+  virtual CSSTransition* AsCSSTransition() { return nullptr; }
+  virtual const CSSTransition* AsCSSTransition() const { return nullptr; }
+
+  /**
+   * Flag to pass to Play to indicate whether or not it should automatically
+   * rewind the current time to the start point if the animation is finished.
+   * For regular calls to play() from script we should do this, but when a CSS
+   * animation's animation-play-state changes we shouldn't rewind the animation.
+   */
+  enum class LimitBehavior { AutoRewind, Continue };
+
+  // Animation interface methods
+  static already_AddRefed<Animation> Constructor(
+      const GlobalObject& aGlobal, AnimationEffect* aEffect,
+      const Optional<AnimationTimeline*>& aTimeline, ErrorResult& aRv);
+
+  void GetId(nsAString& aResult) const { aResult = mId; }
+  void SetId(const nsAString& aId);
+
+  AnimationEffect* GetEffect() const { return mEffect; }
+  virtual void SetEffect(AnimationEffect* aEffect);
+  void SetEffectNoUpdate(AnimationEffect* aEffect);
+
+  AnimationTimeline* GetTimeline() const { return mTimeline; }
+  // Animation.timeline setter is supported only on Nightly.
+  void SetTimeline(AnimationTimeline* aTimeline);
+  void SetTimelineNoUpdate(AnimationTimeline* aTimeline);
+
+  Nullable<TimeDuration> GetStartTime() const { return mStartTime; }
+  Nullable<double> GetStartTimeAsDouble() const;
+  void SetStartTime(const Nullable<TimeDuration>& aNewStartTime);
+  virtual void SetStartTimeAsDouble(const Nullable<double>& aStartTime);
+
+  // This is deliberately _not_ called GetCurrentTime since that would clash
+  // with a macro defined in winbase.h
+  Nullable<TimeDuration> GetCurrentTimeAsDuration() const {
+    return GetCurrentTimeForHoldTime(mHoldTime);
+  }
+  Nullable<double> GetCurrentTimeAsDouble() const;
+  void SetCurrentTime(const TimeDuration& aSeekTime);
+  void SetCurrentTimeNoUpdate(const TimeDuration& aSeekTime);
+  void SetCurrentTimeAsDouble(const Nullable<double>& aCurrentTime,
+                              ErrorResult& aRv);
+
+  double PlaybackRate() const { return mPlaybackRate; }
+  void SetPlaybackRate(double aPlaybackRate);
+
+  AnimationPlayState PlayState() const;
+  virtual AnimationPlayState PlayStateFromJS() const { return PlayState(); }
+
+  bool Pending() const { return mPendingState != PendingState::NotPending; }
+  virtual bool PendingFromJS() const { return Pending(); }
+  AnimationReplaceState ReplaceState() const { return mReplaceState; }
+
+  virtual Promise* GetReady(ErrorResult& aRv);
+  Promise* GetFinished(ErrorResult& aRv);
+
+  IMPL_EVENT_HANDLER(finish);
+  IMPL_EVENT_HANDLER(cancel);
+  IMPL_EVENT_HANDLER(remove);
+
+  void Cancel(PostRestyleMode aPostRestyle = PostRestyleMode::IfNeeded);
+
+  void Finish(ErrorResult& aRv);
+
+  void Play(ErrorResult& aRv, LimitBehavior aLimitBehavior);
+  virtual void PlayFromJS(ErrorResult& aRv) {
+    Play(aRv, LimitBehavior::AutoRewind);
+  }
+
+  void Pause(ErrorResult& aRv);
+  virtual void PauseFromJS(ErrorResult& aRv) { Pause(aRv); }
+
+  void UpdatePlaybackRate(double aPlaybackRate);
+  virtual void Reverse(ErrorResult& aRv);
+
+  void Persist();
+  MOZ_CAN_RUN_SCRIPT void CommitStyles(ErrorResult& aRv);
+
+  bool IsRunningOnCompositor() const;
+
+  virtual void Tick();
+  bool NeedsTicks() const {
+    return Pending() ||
+           (PlayState() == AnimationPlayState::Running &&
+            // An animation with a zero playback rate doesn't need ticks even if
+            // it is running since it effectively behaves as if it is paused.
+            //
+            // It's important we return false in this case since a zero playback
+            // rate animation in the before or after phase that doesn't fill
+            // won't be relevant and hence won't be returned by GetAnimations().
+            // We don't want its timeline to keep it alive (which would happen
+            // if we return true) since otherwise it will effectively be leaked.
+            PlaybackRate() != 0.0) ||
+           // Always return true for not idle animations attached to not
+           // monotonically increasing timelines even if the animation is
+           // finished. This is required to accommodate cases where timeline
+           // ticks back in time.
+           (mTimeline && !mTimeline->IsMonotonicallyIncreasing() &&
+            PlayState() != AnimationPlayState::Idle);
+  }
+
+  /**
+   * Set the time to use for starting or pausing a pending animation.
+   *
+   * Typically, when an animation is played, it does not start immediately but
+   * is added to a table of pending animations on the document of its effect.
+   * In the meantime it sets its hold time to the time from which playback
+   * should begin.
+   *
+   * When the document finishes painting, any pending animations in its table
+   * are marked as being ready to start by calling TriggerOnNextTick.
+   * The moment when the paint completed is also recorded, converted to a
+   * timeline time, and passed to StartOnTick. This is so that when these
+   * animations do start, they can be timed from the point when painting
+   * completed.
+   *
+   * After calling TriggerOnNextTick, animations remain in the pending state
+   * until the next refresh driver tick. At that time they transition out of
+   * the pending state using the time passed to TriggerOnNextTick as the
+   * effective time at which they resumed.
+   *
+   * This approach means that any setup time required for performing the
+   * initial paint of an animation such as layerization is not deducted from
+   * the running time of the animation. Without this we can easily drop the
+   * first few frames of an animation, or, on slower devices, the whole
+   * animation.
+   *
+   * Furthermore:
+   *
+   * - Starting the animation immediately when painting finishes is problematic
+   *   because the start time of the animation will be ahead of its timeline
+   *   (since the timeline time is based on the refresh driver time).
+   *   That's a problem because the animation is playing but its timing
+   *   suggests it starts in the future. We could update the timeline to match
+   *   the start time of the animation but then we'd also have to update the
+   *   timing and style of all animations connected to that timeline or else be
+   *   stuck in an inconsistent state until the next refresh driver tick.
+   *
+   * - If we simply use the refresh driver time on its next tick, the lag
+   *   between triggering an animation and its effective start is unacceptably
+   *   long.
+   *
+   * For pausing, we apply the same asynchronous approach. This is so that we
+   * synchronize with animations that are running on the compositor. Otherwise
+   * if the main thread lags behind the compositor there will be a noticeable
+   * jump backwards when the main thread takes over. Even though main thread
+   * animations could be paused immediately, we do it asynchronously for
+   * consistency and so that animations paused together end up in step.
+   *
+   * Note that the caller of this method is responsible for removing the
+   * animation from any PendingAnimationTracker it may have been added to.
+   */
+  void TriggerOnNextTick(const Nullable<TimeDuration>& aReadyTime);
+  /**
+   * For the monotonically increasing timeline, we use this only for testing:
+   * Start or pause a pending animation using the current timeline time. This
+   * is used to support existing tests that expect animations to begin
+   * immediately. Ideally we would rewrite the those tests and get rid of this
+   * method, but there are a lot of them.
+   *
+   * As with TriggerOnNextTick, the caller of this method is responsible for
+   * removing the animation from any PendingAnimationTracker it may have been
+   * added to.
+   */
+  void TriggerNow();
+  /**
+   * For the non-monotonically increasing timeline (e.g. ScrollTimeline), we try
+   * to trigger it in ScrollTimelineAnimationTracker by this method. This uses
+   * the current scroll position as the ready time. Return true if we don't need
+   * to trigger it or we trigger it successfully.
+   */
+  bool TryTriggerNowForFiniteTimeline();
+  /**
+   * When TriggerOnNextTick is called, we store the ready time but we don't
+   * apply it until the next tick. In the meantime, GetStartTime() will return
+   * null.
+   *
+   * However, if we build layer animations again before the next tick, we
+   * should initialize them with the start time that GetStartTime() will return
+   * on the next tick.
+   *
+   * If we were to simply set the start time of layer animations to null, their
+   * start time would be updated to the current wallclock time when rendering
+   * finishes, thus making them out of sync with the start time stored here.
+   * This, in turn, will make the animation jump backwards when we build
+   * animations on the next tick and apply the start time stored here.
+   *
+   * This method returns the start time, if resolved. Otherwise, if we have
+   * a pending ready time, it returns the corresponding start time. If neither
+   * of those are available, it returns null.
+   */
+  Nullable<TimeDuration> GetCurrentOrPendingStartTime() const;
+
+  /**
+   * As with the start time, we should use the pending playback rate when
+   * producing layer animations.
+   */
+  double CurrentOrPendingPlaybackRate() const {
+    return mPendingPlaybackRate.valueOr(mPlaybackRate);
+  }
+  bool HasPendingPlaybackRate() const { return mPendingPlaybackRate.isSome(); }
+
+  /**
+   * The following relationship from the definition of the 'current time' is
+   * re-used in many algorithms so we extract it here into a static method that
+   * can be re-used:
+   *
+   *   current time = (timeline time - start time) * playback rate
+   *
+   * As per https://drafts.csswg.org/web-animations-1/#current-time
+   */
+  static TimeDuration CurrentTimeFromTimelineTime(
+      const TimeDuration& aTimelineTime, const TimeDuration& aStartTime,
+      float aPlaybackRate) {
+    return (aTimelineTime - aStartTime).MultDouble(aPlaybackRate);
+  }
+
+  /**
+   * As with calculating the current time, we often need to calculate a start
+   * time from a current time. The following method simply inverts the current
+   * time relationship.
+   *
+   * In each case where this is used, the desired behavior for playbackRate ==
+   * 0 is to return the specified timeline time (often referred to as the ready
+   * time).
+   */
+  static TimeDuration StartTimeFromTimelineTime(
+      const TimeDuration& aTimelineTime, const TimeDuration& aCurrentTime,
+      float aPlaybackRate) {
+    TimeDuration result = aTimelineTime;
+    if (aPlaybackRate == 0) {
+      return result;
+    }
+
+    result -= aCurrentTime.MultDouble(1.0 / aPlaybackRate);
+    return result;
+  }
+
+  /**
+   * Converts a time in the timescale of this Animation's currentTime, to a
+   * TimeStamp. Returns a null TimeStamp if the conversion cannot be performed
+   * because of the current state of this Animation (e.g. it has no timeline, a
+   * zero playbackRate, an unresolved start time etc.) or the value of the time
+   * passed-in (e.g. an infinite time).
+   */
+  TimeStamp AnimationTimeToTimeStamp(const StickyTimeDuration& aTime) const;
+
+  // Converts an AnimationEvent's elapsedTime value to an equivalent TimeStamp
+  // that can be used to sort events by when they occurred.
+  TimeStamp ElapsedTimeToTimeStamp(
+      const StickyTimeDuration& aElapsedTime) const;
+
+  bool IsPausedOrPausing() const {
+    return PlayState() == AnimationPlayState::Paused;
+  }
+
+  bool HasCurrentEffect() const;
+  bool IsInEffect() const;
+
+  bool IsPlaying() const {
+    return mPlaybackRate != 0.0 && mTimeline &&
+           !mTimeline->GetCurrentTimeAsDuration().IsNull() &&
+           PlayState() == AnimationPlayState::Running;
+  }
+
+  bool ShouldBeSynchronizedWithMainThread(
+      const nsCSSPropertyIDSet& aPropertySet, const nsIFrame* aFrame,
+      AnimationPerformanceWarning::Type& aPerformanceWarning /* out */) const;
+
+  bool IsRelevant() const { return mIsRelevant; }
+  void UpdateRelevance();
+
+  // https://drafts.csswg.org/web-animations-1/#replaceable-animation
+  bool IsReplaceable() const;
+
+  /**
+   * Returns true if this Animation satisfies the requirements for being
+   * removed when it is replaced.
+   *
+   * Returning true does not imply this animation _should_ be removed.
+   * Determining that depends on the other effects in the same EffectSet to
+   * which this animation's effect, if any, contributes.
+   */
+  bool IsRemovable() const;
+
+  /**
+   * Make this animation's target effect no-longer part of the effect stack
+   * while preserving its timing information.
+   */
+  void Remove();
+
+  /**
+   * Returns true if this Animation has a lower composite order than aOther.
+   */
+  bool HasLowerCompositeOrderThan(const Animation& aOther) const;
+
+  /**
+   * Returns the level at which the effect(s) associated with this Animation
+   * are applied to the CSS cascade.
+   */
+  virtual EffectCompositor::CascadeLevel CascadeLevel() const {
+    return EffectCompositor::CascadeLevel::Animations;
+  }
+
+  /**
+   * Returns true if this animation does not currently need to update
+   * style on the main thread (e.g. because it is empty, or is
+   * running on the compositor).
+   */
+  bool CanThrottle() const;
+
+  /**
+   * Updates various bits of state that we need to update as the result of
+   * running ComposeStyle().
+   * See the comment of KeyframeEffect::WillComposeStyle for more detail.
+   */
+  void WillComposeStyle();
+
+  /**
+   * Updates |aComposeResult| with the animation values of this animation's
+   * effect, if any.
+   * Any properties contained in |aPropertiesToSkip| will not be added or
+   * updated in |aComposeResult|.
+   */
+  void ComposeStyle(RawServoAnimationValueMap& aComposeResult,
+                    const nsCSSPropertyIDSet& aPropertiesToSkip);
+
+  void NotifyEffectTimingUpdated();
+  void NotifyEffectPropertiesUpdated();
+  void NotifyEffectTargetUpdated();
+  void NotifyGeometricAnimationsStartingThisFrame();
+
+  /**
+   * Reschedule pending pause or pending play tasks when updating the target
+   * effect.
+   *
+   * If we are pending, we will either be registered in the pending animation
+   * tracker and have a null pending ready time, or, after our effect has been
+   * painted, we will be removed from the tracker and assigned a pending ready
+   * time.
+   *
+   * When the target effect is updated, we'll typically need to repaint so for
+   * the latter case where we already have a pending ready time, clear it and
+   * put ourselves back in the pending animation tracker.
+   */
+  void ReschedulePendingTasks();
+
+  /**
+   * Used by subclasses to synchronously queue a cancel event in situations
+   * where the Animation may have been cancelled.
+   *
+   * We need to do this synchronously because after a CSS animation/transition
+   * is canceled, it will be released by its owning element and may not still
+   * exist when we would normally go to queue events on the next tick.
+   */
+  virtual void MaybeQueueCancelEvent(const StickyTimeDuration& aActiveTime){};
+
+  Maybe<uint32_t>& CachedChildIndexRef() { return mCachedChildIndex; }
+
+  void SetPartialPrerendered(uint64_t aIdOnCompositor) {
+    mIdOnCompositor = aIdOnCompositor;
+    mIsPartialPrerendered = true;
+  }
+  bool IsPartialPrerendered() const { return mIsPartialPrerendered; }
+  uint64_t IdOnCompositor() const { return mIdOnCompositor; }
+  /**
+   * Needs to be called when the pre-rendered animation is going to no longer
+   * run on the compositor.
+   */
+  void ResetPartialPrerendered() {
+    MOZ_ASSERT(mIsPartialPrerendered);
+    mIsPartialPrerendered = false;
+    mIdOnCompositor = 0;
+  }
+  /**
+   * Called via NotifyJankedAnimations IPC call from the compositor to update
+   * pre-rendered area on the main-thread.
+   */
+  void UpdatePartialPrerendered() {
+    ResetPartialPrerendered();
+    PostUpdate();
+  }
+
+  bool UsingScrollTimeline() const {
+    return mTimeline && mTimeline->IsScrollTimeline();
+  }
+
+  /**
+   * Returns true if this is at the progress timeline boundary.
+   * https://drafts.csswg.org/web-animations-2/#at-progress-timeline-boundary
+   */
+  enum class ProgressTimelinePosition : uint8_t { Boundary, NotBoundary };
+  static ProgressTimelinePosition AtProgressTimelineBoundary(
+      const Nullable<TimeDuration>& aTimelineDuration,
+      const Nullable<TimeDuration>& aCurrentTime,
+      const TimeDuration& aEffectStartTime, const double aPlaybackRate);
+  ProgressTimelinePosition AtProgressTimelineBoundary() const {
+    return AtProgressTimelineBoundary(
+        mTimeline ? mTimeline->TimelineDuration() : nullptr,
+        GetCurrentTimeAsDuration(),
+        mStartTime.IsNull() ? TimeDuration() : mStartTime.Value(),
+        mPlaybackRate);
+  }
+
+  void SetHiddenByContentVisibility(bool hidden);
+  bool IsHiddenByContentVisibility() const {
+    return mHiddenByContentVisibility;
+  }
+
+ protected:
+  void SilentlySetCurrentTime(const TimeDuration& aNewCurrentTime);
+  void CancelNoUpdate();
+  void PlayNoUpdate(ErrorResult& aRv, LimitBehavior aLimitBehavior);
+  void ResumeAt(const TimeDuration& aReadyTime);
+  void PauseAt(const TimeDuration& aReadyTime);
+  void FinishPendingAt(const TimeDuration& aReadyTime) {
+    if (mPendingState == PendingState::PlayPending) {
+      ResumeAt(aReadyTime);
+    } else if (mPendingState == PendingState::PausePending) {
+      PauseAt(aReadyTime);
+    } else {
+      MOZ_ASSERT_UNREACHABLE(
+          "Can't finish pending if we're not in a pending state");
+    }
+  }
+  void ApplyPendingPlaybackRate() {
+    if (mPendingPlaybackRate) {
+      mPlaybackRate = *mPendingPlaybackRate;
+      mPendingPlaybackRate.reset();
+    }
+  }
+
+  /**
+   * Finishing behavior depends on if changes to timing occurred due
+   * to a seek or regular playback.
+   */
+  enum class SeekFlag { NoSeek, DidSeek };
+
+  enum class SyncNotifyFlag { Sync, Async };
+
+  virtual void UpdateTiming(SeekFlag aSeekFlag, SyncNotifyFlag aSyncNotifyFlag);
+  void UpdateFinishedState(SeekFlag aSeekFlag, SyncNotifyFlag aSyncNotifyFlag);
+  void UpdateEffect(PostRestyleMode aPostRestyle);
+  /**
+   * Flush all pending styles other than throttled animation styles (e.g.
+   * animations running on the compositor).
+   */
+  void FlushUnanimatedStyle() const;
+  void PostUpdate();
+  void ResetFinishedPromise();
+  void MaybeResolveFinishedPromise();
+  void DoFinishNotification(SyncNotifyFlag aSyncNotifyFlag);
+  friend class AsyncFinishNotification;
+  void DoFinishNotificationImmediately(MicroTaskRunnable* aAsync = nullptr);
+  void QueuePlaybackEvent(const nsAString& aName,
+                          TimeStamp&& aScheduledEventTime);
+
+  /**
+   * Remove this animation from the pending animation tracker and reset
+   * mPendingState as necessary. The caller is responsible for resolving or
+   * aborting the mReady promise as necessary.
+   */
+  void CancelPendingTasks();
+
+  /**
+   * Performs the same steps as CancelPendingTasks and also rejects and
+   * recreates the ready promise if the animation was pending.
+   */
+  void ResetPendingTasks();
+
+  /**
+   * Returns true if this animation is not only play-pending, but has
+   * yet to be given a pending ready time. This roughly corresponds to
+   * animations that are waiting to be painted (since we set the pending
+   * ready time at the end of painting). Identifying such animations is
+   * useful because in some cases animations that are painted together
+   * may need to be synchronized.
+   *
+   * We don't, however, want to include animations with a fixed start time such
+   * as animations that are simply having their playbackRate updated or which
+   * are resuming from an aborted pause.
+   */
+  bool IsNewlyStarted() const {
+    return mPendingState == PendingState::PlayPending &&
+           mPendingReadyTime.IsNull() && mStartTime.IsNull();
+  }
+  bool IsPossiblyOrphanedPendingAnimation() const;
+  StickyTimeDuration EffectEnd() const;
+
+  Nullable<TimeDuration> GetCurrentTimeForHoldTime(
+      const Nullable<TimeDuration>& aHoldTime) const;
+  Nullable<TimeDuration> GetUnconstrainedCurrentTime() const {
+    return GetCurrentTimeForHoldTime(Nullable<TimeDuration>());
+  }
+
+  void ScheduleReplacementCheck();
+  void MaybeScheduleReplacementCheck();
+
+  // Earlier side of the elapsed time range reported in CSS Animations and CSS
+  // Transitions events.
+  //
+  // https://drafts.csswg.org/css-animations-2/#interval-start
+  // https://drafts.csswg.org/css-transitions-2/#interval-start
+  StickyTimeDuration IntervalStartTime(
+      const StickyTimeDuration& aActiveDuration) const;
+
+  // Later side of the elapsed time range reported in CSS Animations and CSS
+  // Transitions events.
+  //
+  // https://drafts.csswg.org/css-animations-2/#interval-end
+  // https://drafts.csswg.org/css-transitions-2/#interval-end
+  StickyTimeDuration IntervalEndTime(
+      const StickyTimeDuration& aActiveDuration) const;
+
+  TimeStamp GetTimelineCurrentTimeAsTimeStamp() const {
+    return mTimeline ? mTimeline->GetCurrentTimeAsTimeStamp() : TimeStamp();
+  }
+
+  Document* GetRenderedDocument() const;
+  Document* GetTimelineDocument() const;
+
+  bool HasFiniteTimeline() const {
+    return mTimeline && !mTimeline->IsMonotonicallyIncreasing();
+  }
+
+  void UpdatePendingAnimationTracker(AnimationTimeline* aOldTimeline,
+                                     AnimationTimeline* aNewTimeline);
+
+  RefPtr<AnimationTimeline> mTimeline;
+  RefPtr<AnimationEffect> mEffect;
+  // The beginning of the delay period.
+  Nullable<TimeDuration> mStartTime;            // Timeline timescale
+  Nullable<TimeDuration> mHoldTime;             // Animation timescale
+  Nullable<TimeDuration> mPendingReadyTime;     // Timeline timescale
+  Nullable<TimeDuration> mPreviousCurrentTime;  // Animation timescale
+  double mPlaybackRate = 1.0;
+  Maybe<double> mPendingPlaybackRate;
+
+  // A Promise that is replaced on each call to Play()
+  // and fulfilled when Play() is successfully completed.
+  // This object is lazily created by GetReady.
+  // See http://drafts.csswg.org/web-animations/#current-ready-promise
+  RefPtr<Promise> mReady;
+
+  // A Promise that is resolved when we reach the end of the effect, or
+  // 0 when playing backwards. The Promise is replaced if the animation is
+  // finished but then a state change makes it not finished.
+  // This object is lazily created by GetFinished.
+  // See http://drafts.csswg.org/web-animations/#current-finished-promise
+  RefPtr<Promise> mFinished;
+
+  static uint64_t sNextAnimationIndex;
+
+  // The relative position of this animation within the global animation list.
+  //
+  // Note that subclasses such as CSSTransition and CSSAnimation may repurpose
+  // this member to implement their own brand of sorting. As a result, it is
+  // possible for two different objects to have the same index.
+  uint64_t mAnimationIndex;
+
+  // While ordering Animation objects for event dispatch, the index of the
+  // target node in its parent may be cached in mCachedChildIndex.
+  Maybe<uint32_t> mCachedChildIndex;
+
+  // Indicates if the animation is in the pending state (and what state it is
+  // waiting to enter when it finished pending). We use this rather than
+  // checking if this animation is tracked by a PendingAnimationTracker because
+  // the animation will continue to be pending even after it has been removed
+  // from the PendingAnimationTracker while it is waiting for the next tick
+  // (see TriggerOnNextTick for details).
+  enum class PendingState : uint8_t { NotPending, PlayPending, PausePending };
+  PendingState mPendingState = PendingState::NotPending;
+
+  // Handling of this animation's target effect when filling while finished.
+  AnimationReplaceState mReplaceState = AnimationReplaceState::Active;
+
+  bool mFinishedAtLastComposeStyle = false;
+  bool mWasReplaceableAtLastTick = false;
+
+  bool mHiddenByContentVisibility = false;
+
+  // Indicates that the animation should be exposed in an element's
+  // getAnimations() list.
+  bool mIsRelevant = false;
+
+  // True if mFinished is resolved or would be resolved if mFinished has
+  // yet to be created. This is not set when mFinished is rejected since
+  // in that case mFinished is immediately reset to represent a new current
+  // finished promise.
+  bool mFinishedIsResolved = false;
+
+  // True if this animation was triggered at the same time as one or more
+  // geometric animations and hence we should run any transform animations on
+  // the main thread.
+  bool mSyncWithGeometricAnimations = false;
+
+  RefPtr<MicroTaskRunnable> mFinishNotificationTask;
+
+  nsString mId;
+
+  bool mResetCurrentTimeOnResume = false;
+
+  // Whether the Animation is System, ResistFingerprinting, or neither
+  RTPCallerType mRTPCallerType;
+
+ private:
+  // The id for this animaiton on the compositor.
+  uint64_t mIdOnCompositor = 0;
+  bool mIsPartialPrerendered = false;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_Animation_h