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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/. */
#include "nsAnimationManager.h"
#include "nsTransitionManager.h"
#include "mozilla/dom/CSSAnimationBinding.h"
#include "mozilla/AnimationEventDispatcher.h"
#include "mozilla/AnimationTarget.h"
#include "mozilla/EffectCompositor.h"
#include "mozilla/EffectSet.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/ServoStyleSet.h"
#include "mozilla/StyleAnimationValue.h"
#include "mozilla/dom/AnimationEffect.h"
#include "mozilla/dom/DocumentTimeline.h"
#include "mozilla/dom/KeyframeEffect.h"
#include "nsPresContext.h"
#include "nsPresContextInlines.h"
#include "nsStyleChangeList.h"
#include "nsLayoutUtils.h"
#include "nsIFrame.h"
#include "mozilla/dom/Document.h"
#include "nsDOMMutationObserver.h"
#include "nsRFPService.h"
#include <algorithm> // std::stable_sort
#include <math.h>
using namespace mozilla;
using namespace mozilla::css;
using mozilla::dom::Animation;
using mozilla::dom::AnimationEffect;
using mozilla::dom::AnimationPlayState;
using mozilla::dom::CSSAnimation;
using mozilla::dom::KeyframeEffect;
typedef mozilla::ComputedTiming::AnimationPhase AnimationPhase;
////////////////////////// CSSAnimation ////////////////////////////
JSObject* CSSAnimation::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return dom::CSSAnimation_Binding::Wrap(aCx, this, aGivenProto);
}
mozilla::dom::Promise* CSSAnimation::GetReady(ErrorResult& aRv) {
FlushUnanimatedStyle();
return Animation::GetReady(aRv);
}
void CSSAnimation::Play(ErrorResult& aRv, LimitBehavior aLimitBehavior) {
mPauseShouldStick = false;
Animation::Play(aRv, aLimitBehavior);
}
void CSSAnimation::Pause(ErrorResult& aRv) {
mPauseShouldStick = true;
Animation::Pause(aRv);
}
AnimationPlayState CSSAnimation::PlayStateFromJS() const {
// Flush style to ensure that any properties controlling animation state
// (e.g. animation-play-state) are fully updated.
FlushUnanimatedStyle();
return Animation::PlayStateFromJS();
}
bool CSSAnimation::PendingFromJS() const {
// Flush style since, for example, if the animation-play-state was just
// changed its possible we should now be pending.
FlushUnanimatedStyle();
return Animation::PendingFromJS();
}
void CSSAnimation::PlayFromJS(ErrorResult& aRv) {
// Note that flushing style below might trigger calls to
// PlayFromStyle()/PauseFromStyle() on this object.
FlushUnanimatedStyle();
Animation::PlayFromJS(aRv);
}
void CSSAnimation::PlayFromStyle() {
mIsStylePaused = false;
if (!mPauseShouldStick) {
ErrorResult rv;
Animation::Play(rv, Animation::LimitBehavior::Continue);
// play() should not throw when LimitBehavior is Continue
MOZ_ASSERT(!rv.Failed(), "Unexpected exception playing animation");
}
}
void CSSAnimation::PauseFromStyle() {
// Check if the pause state is being overridden
if (mIsStylePaused) {
return;
}
mIsStylePaused = true;
ErrorResult rv;
Animation::Pause(rv);
// pause() should only throw when *all* of the following conditions are true:
// - we are in the idle state, and
// - we have a negative playback rate, and
// - we have an infinitely repeating animation
// The first two conditions will never happen under regular style processing
// but could happen if an author made modifications to the Animation object
// and then updated animation-play-state. It's an unusual case and there's
// no obvious way to pass on the exception information so we just silently
// fail for now.
if (rv.Failed()) {
NS_WARNING("Unexpected exception pausing animation - silently failing");
}
}
void CSSAnimation::Tick() {
Animation::Tick();
QueueEvents();
}
bool CSSAnimation::HasLowerCompositeOrderThan(
const CSSAnimation& aOther) const {
MOZ_ASSERT(IsTiedToMarkup() && aOther.IsTiedToMarkup(),
"Should only be called for CSS animations that are sorted "
"as CSS animations (i.e. tied to CSS markup)");
// 0. Object-equality case
if (&aOther == this) {
return false;
}
// 1. Sort by document order
if (!mOwningElement.Equals(aOther.mOwningElement)) {
return mOwningElement.LessThan(
const_cast<CSSAnimation*>(this)->CachedChildIndexRef(),
aOther.mOwningElement,
const_cast<CSSAnimation*>(&aOther)->CachedChildIndexRef());
}
// 2. (Same element and pseudo): Sort by position in animation-name
return mAnimationIndex < aOther.mAnimationIndex;
}
void CSSAnimation::QueueEvents(const StickyTimeDuration& aActiveTime) {
// If the animation is pending, we ignore animation events until we finish
// pending.
if (mPendingState != PendingState::NotPending) {
return;
}
// CSS animations dispatch events at their owning element. This allows
// script to repurpose a CSS animation to target a different element,
// to use a group effect (which has no obvious "target element"), or
// to remove the animation effect altogether whilst still getting
// animation events.
//
// It does mean, however, that for a CSS animation that has no owning
// element (e.g. it was created using the CSSAnimation constructor or
// disassociated from CSS) no events are fired. If it becomes desirable
// for these animations to still fire events we should spec the concept
// of the "original owning element" or "event target" and allow script
// to set it when creating a CSSAnimation object.
if (!mOwningElement.IsSet()) {
return;
}
nsPresContext* presContext = mOwningElement.GetPresContext();
if (!presContext) {
return;
}
uint64_t currentIteration = 0;
ComputedTiming::AnimationPhase currentPhase;
StickyTimeDuration intervalStartTime;
StickyTimeDuration intervalEndTime;
StickyTimeDuration iterationStartTime;
if (!mEffect) {
currentPhase =
GetAnimationPhaseWithoutEffect<ComputedTiming::AnimationPhase>(*this);
if (currentPhase == mPreviousPhase) {
return;
}
} else {
ComputedTiming computedTiming = mEffect->GetComputedTiming();
currentPhase = computedTiming.mPhase;
currentIteration = computedTiming.mCurrentIteration;
if (currentPhase == mPreviousPhase &&
currentIteration == mPreviousIteration) {
return;
}
intervalStartTime = IntervalStartTime(computedTiming.mActiveDuration);
intervalEndTime = IntervalEndTime(computedTiming.mActiveDuration);
uint64_t iterationBoundary = mPreviousIteration > currentIteration
? currentIteration + 1
: currentIteration;
iterationStartTime = computedTiming.mDuration.MultDouble(
(iterationBoundary - computedTiming.mIterationStart));
}
TimeStamp startTimeStamp = ElapsedTimeToTimeStamp(intervalStartTime);
TimeStamp endTimeStamp = ElapsedTimeToTimeStamp(intervalEndTime);
TimeStamp iterationTimeStamp = ElapsedTimeToTimeStamp(iterationStartTime);
AutoTArray<AnimationEventInfo, 2> events;
auto appendAnimationEvent = [&](EventMessage aMessage,
const StickyTimeDuration& aElapsedTime,
const TimeStamp& aScheduledEventTimeStamp) {
double elapsedTime = aElapsedTime.ToSeconds();
if (aMessage == eAnimationCancel) {
// 0 is an inappropriate value for this callsite. What we need to do is
// use a single random value for all increasing times reportable.
// That is to say, whenever elapsedTime goes negative (because an
// animation restarts, something rewinds the animation, or otherwise)
// a new random value for the mix-in must be generated.
elapsedTime = nsRFPService::ReduceTimePrecisionAsSecs(
elapsedTime, 0, TimerPrecisionType::RFPOnly);
}
events.AppendElement(
AnimationEventInfo(mAnimationName, mOwningElement.Target(), aMessage,
elapsedTime, aScheduledEventTimeStamp, this));
};
// Handle cancel event first
if ((mPreviousPhase != AnimationPhase::Idle &&
mPreviousPhase != AnimationPhase::After) &&
currentPhase == AnimationPhase::Idle) {
appendAnimationEvent(eAnimationCancel, aActiveTime,
GetTimelineCurrentTimeAsTimeStamp());
}
switch (mPreviousPhase) {
case AnimationPhase::Idle:
case AnimationPhase::Before:
if (currentPhase == AnimationPhase::Active) {
appendAnimationEvent(eAnimationStart, intervalStartTime,
startTimeStamp);
} else if (currentPhase == AnimationPhase::After) {
appendAnimationEvent(eAnimationStart, intervalStartTime,
startTimeStamp);
appendAnimationEvent(eAnimationEnd, intervalEndTime, endTimeStamp);
}
break;
case AnimationPhase::Active:
if (currentPhase == AnimationPhase::Before) {
appendAnimationEvent(eAnimationEnd, intervalStartTime, startTimeStamp);
} else if (currentPhase == AnimationPhase::Active) {
// The currentIteration must have changed or element we would have
// returned early above.
MOZ_ASSERT(currentIteration != mPreviousIteration);
appendAnimationEvent(eAnimationIteration, iterationStartTime,
iterationTimeStamp);
} else if (currentPhase == AnimationPhase::After) {
appendAnimationEvent(eAnimationEnd, intervalEndTime, endTimeStamp);
}
break;
case AnimationPhase::After:
if (currentPhase == AnimationPhase::Before) {
appendAnimationEvent(eAnimationStart, intervalEndTime, startTimeStamp);
appendAnimationEvent(eAnimationEnd, intervalStartTime, endTimeStamp);
} else if (currentPhase == AnimationPhase::Active) {
appendAnimationEvent(eAnimationStart, intervalEndTime, endTimeStamp);
}
break;
}
mPreviousPhase = currentPhase;
mPreviousIteration = currentIteration;
if (!events.IsEmpty()) {
presContext->AnimationEventDispatcher()->QueueEvents(std::move(events));
}
}
void CSSAnimation::UpdateTiming(SeekFlag aSeekFlag,
SyncNotifyFlag aSyncNotifyFlag) {
if (mNeedsNewAnimationIndexWhenRun &&
PlayState() != AnimationPlayState::Idle) {
mAnimationIndex = sNextAnimationIndex++;
mNeedsNewAnimationIndexWhenRun = false;
}
Animation::UpdateTiming(aSeekFlag, aSyncNotifyFlag);
}
////////////////////////// nsAnimationManager ////////////////////////////
// Find the matching animation by |aName| in the old list
// of animations and remove the matched animation from the list.
static already_AddRefed<CSSAnimation> PopExistingAnimation(
const nsAtom* aName,
nsAnimationManager::CSSAnimationCollection* aCollection) {
if (!aCollection) {
return nullptr;
}
// Animations are stored in reverse order to how they appear in the
// animation-name property. However, we want to match animations beginning
// from the end of the animation-name list, so we iterate *forwards*
// through the collection.
for (size_t idx = 0, length = aCollection->mAnimations.Length();
idx != length; ++idx) {
CSSAnimation* cssAnim = aCollection->mAnimations[idx];
if (cssAnim->AnimationName() == aName) {
RefPtr<CSSAnimation> match = cssAnim;
aCollection->mAnimations.RemoveElementAt(idx);
return match.forget();
}
}
return nullptr;
}
class MOZ_STACK_CLASS ServoCSSAnimationBuilder final {
public:
explicit ServoCSSAnimationBuilder(const ComputedStyle* aComputedStyle)
: mComputedStyle(aComputedStyle) {
MOZ_ASSERT(aComputedStyle);
}
bool BuildKeyframes(const Element& aElement, nsPresContext* aPresContext,
nsAtom* aName, const nsTimingFunction& aTimingFunction,
nsTArray<Keyframe>& aKeyframes) {
return aPresContext->StyleSet()->GetKeyframesForName(
aElement, *mComputedStyle, aName, aTimingFunction, aKeyframes);
}
void SetKeyframes(KeyframeEffect& aEffect, nsTArray<Keyframe>&& aKeyframes) {
aEffect.SetKeyframes(std::move(aKeyframes), mComputedStyle);
}
// Currently all the animation building code in this file is based on
// assumption that creating and removing animations should *not* trigger
// additional restyles since those changes will be handled within the same
// restyle.
//
// While that is true for the Gecko style backend, it is not true for the
// Servo style backend where we want restyles to be triggered so that we
// perform a second animation restyle where we will incorporate the changes
// arising from creating and removing animations.
//
// Fortunately, our attempts to avoid posting extra restyles as part of the
// processing here are imperfect and most of the time we happen to post
// them anyway. Occasionally, however, we don't. For example, we don't post
// a restyle when we create a new animation whose an animation index matches
// the default value it was given already (which is typically only true when
// the CSSAnimation we create is the first Animation created in a particular
// content process).
//
// As a result, when we are using the Servo backend, whenever we have an added
// or removed animation we need to explicitly trigger a restyle.
//
// This code should eventually disappear along with the Gecko style backend
// and we should simply call Play() / Pause() / Cancel() etc. which will
// post the required restyles.
void NotifyNewOrRemovedAnimation(const Animation& aAnimation) {
dom::AnimationEffect* effect = aAnimation.GetEffect();
if (!effect) {
return;
}
KeyframeEffect* keyframeEffect = effect->AsKeyframeEffect();
if (!keyframeEffect) {
return;
}
keyframeEffect->RequestRestyle(EffectCompositor::RestyleType::Standard);
}
private:
const ComputedStyle* mComputedStyle;
};
static void UpdateOldAnimationPropertiesWithNew(
CSSAnimation& aOld, TimingParams&& aNewTiming,
nsTArray<Keyframe>&& aNewKeyframes, bool aNewIsStylePaused,
ServoCSSAnimationBuilder& aBuilder) {
bool animationChanged = false;
// Update the old from the new so we can keep the original object
// identity (and any expando properties attached to it).
if (aOld.GetEffect()) {
dom::AnimationEffect* oldEffect = aOld.GetEffect();
animationChanged = oldEffect->SpecifiedTiming() != aNewTiming;
oldEffect->SetSpecifiedTiming(std::move(aNewTiming));
KeyframeEffect* oldKeyframeEffect = oldEffect->AsKeyframeEffect();
if (oldKeyframeEffect) {
aBuilder.SetKeyframes(*oldKeyframeEffect, std::move(aNewKeyframes));
}
}
// Handle changes in play state. If the animation is idle, however,
// changes to animation-play-state should *not* restart it.
if (aOld.PlayState() != AnimationPlayState::Idle) {
// CSSAnimation takes care of override behavior so that,
// for example, if the author has called pause(), that will
// override the animation-play-state.
// (We should check aNew->IsStylePaused() but that requires
// downcasting to CSSAnimation and we happen to know that
// aNew will only ever be paused by calling PauseFromStyle
// making IsPausedOrPausing synonymous in this case.)
if (!aOld.IsStylePaused() && aNewIsStylePaused) {
aOld.PauseFromStyle();
animationChanged = true;
} else if (aOld.IsStylePaused() && !aNewIsStylePaused) {
aOld.PlayFromStyle();
animationChanged = true;
}
}
// Updating the effect timing above might already have caused the
// animation to become irrelevant so only add a changed record if
// the animation is still relevant.
if (animationChanged && aOld.IsRelevant()) {
nsNodeUtils::AnimationChanged(&aOld);
}
}
// Returns a new animation set up with given StyleAnimation.
// Or returns an existing animation matching StyleAnimation's name updated
// with the new StyleAnimation.
static already_AddRefed<CSSAnimation> BuildAnimation(
nsPresContext* aPresContext, const NonOwningAnimationTarget& aTarget,
const nsStyleDisplay& aStyleDisplay, uint32_t animIdx,
ServoCSSAnimationBuilder& aBuilder,
nsAnimationManager::CSSAnimationCollection* aCollection) {
MOZ_ASSERT(aPresContext);
nsAtom* animationName = aStyleDisplay.GetAnimationName(animIdx);
nsTArray<Keyframe> keyframes;
if (!aBuilder.BuildKeyframes(
*aTarget.mElement, aPresContext, animationName,
aStyleDisplay.GetAnimationTimingFunction(animIdx), keyframes)) {
return nullptr;
}
TimingParams timing = TimingParamsFromCSSParams(
aStyleDisplay.GetAnimationDuration(animIdx),
aStyleDisplay.GetAnimationDelay(animIdx),
aStyleDisplay.GetAnimationIterationCount(animIdx),
aStyleDisplay.GetAnimationDirection(animIdx),
aStyleDisplay.GetAnimationFillMode(animIdx));
bool isStylePaused = aStyleDisplay.GetAnimationPlayState(animIdx) ==
StyleAnimationPlayState::Paused;
// Find the matching animation with animation name in the old list
// of animations and remove the matched animation from the list.
RefPtr<CSSAnimation> oldAnim =
PopExistingAnimation(animationName, aCollection);
if (oldAnim) {
// Copy over the start times and (if still paused) pause starts
// for each animation (matching on name only) that was also in the
// old list of animations.
// This means that we honor dynamic changes, which isn't what the
// spec says to do, but WebKit seems to honor at least some of
// them. See
// http://lists.w3.org/Archives/Public/www-style/2011Apr/0079.html
// In order to honor what the spec said, we'd copy more data over.
UpdateOldAnimationPropertiesWithNew(*oldAnim, std::move(timing),
std::move(keyframes), isStylePaused,
aBuilder);
return oldAnim.forget();
}
// mTarget is non-null here, so we emplace it directly.
Maybe<OwningAnimationTarget> target;
target.emplace(aTarget.mElement, aTarget.mPseudoType);
KeyframeEffectParams effectOptions;
RefPtr<KeyframeEffect> effect = new KeyframeEffect(
aPresContext->Document(), target, std::move(timing), effectOptions);
aBuilder.SetKeyframes(*effect, std::move(keyframes));
RefPtr<CSSAnimation> animation = new CSSAnimation(
aPresContext->Document()->GetScopeObject(), animationName);
animation->SetOwningElement(
OwningElementRef(*aTarget.mElement, aTarget.mPseudoType));
animation->SetTimelineNoUpdate(aTarget.mElement->OwnerDoc()->Timeline());
animation->SetEffectNoUpdate(effect);
if (isStylePaused) {
animation->PauseFromStyle();
} else {
animation->PlayFromStyle();
}
aBuilder.NotifyNewOrRemovedAnimation(*animation);
return animation.forget();
}
static nsAnimationManager::OwningCSSAnimationPtrArray BuildAnimations(
nsPresContext* aPresContext, const NonOwningAnimationTarget& aTarget,
const nsStyleDisplay& aStyleDisplay, ServoCSSAnimationBuilder& aBuilder,
nsAnimationManager::CSSAnimationCollection* aCollection,
nsTHashtable<nsRefPtrHashKey<nsAtom>>& aReferencedAnimations) {
nsAnimationManager::OwningCSSAnimationPtrArray result;
for (size_t animIdx = aStyleDisplay.mAnimationNameCount; animIdx-- != 0;) {
nsAtom* name = aStyleDisplay.GetAnimationName(animIdx);
// CSS Animations whose animation-name does not match a @keyframes rule do
// not generate animation events. This includes when the animation-name is
// "none" which is represented by an empty name in the StyleAnimation.
// Since such animations neither affect style nor dispatch events, we do
// not generate a corresponding CSSAnimation for them.
if (name == nsGkAtoms::_empty) {
continue;
}
aReferencedAnimations.PutEntry(name);
RefPtr<CSSAnimation> dest = BuildAnimation(
aPresContext, aTarget, aStyleDisplay, animIdx, aBuilder, aCollection);
if (!dest) {
continue;
}
dest->SetAnimationIndex(static_cast<uint64_t>(animIdx));
result.AppendElement(dest);
}
return result;
}
void nsAnimationManager::UpdateAnimations(dom::Element* aElement,
PseudoStyleType aPseudoType,
const ComputedStyle* aComputedStyle) {
MOZ_ASSERT(mPresContext->IsDynamic(),
"Should not update animations for print or print preview");
MOZ_ASSERT(aElement->IsInComposedDoc(),
"Should not update animations that are not attached to the "
"document tree");
const nsStyleDisplay* disp =
aComputedStyle ? aComputedStyle->StyleDisplay() : nullptr;
if (!disp || disp->mDisplay == StyleDisplay::None) {
// If we are in a display:none subtree we will have no computed values.
// However, if we are on the root of display:none subtree, the computed
// values might not have been cleared yet.
// In either case, since CSS animations should not run in display:none
// subtrees we should stop (actually, destroy) any animations on this
// element here.
StopAnimationsForElement(aElement, aPseudoType);
return;
}
NonOwningAnimationTarget target(aElement, aPseudoType);
ServoCSSAnimationBuilder builder(aComputedStyle);
DoUpdateAnimations(target, *disp, builder);
}
void nsAnimationManager::DoUpdateAnimations(
const NonOwningAnimationTarget& aTarget,
const nsStyleDisplay& aStyleDisplay, ServoCSSAnimationBuilder& aBuilder) {
// Everything that causes our animation data to change triggers a
// style change, which in turn triggers a non-animation restyle.
// Likewise, when we initially construct frames, we're not in a
// style change, but also not in an animation restyle.
CSSAnimationCollection* collection =
CSSAnimationCollection::GetAnimationCollection(aTarget.mElement,
aTarget.mPseudoType);
if (!collection && aStyleDisplay.mAnimationNameCount == 1 &&
aStyleDisplay.mAnimations[0].GetName() == nsGkAtoms::_empty) {
return;
}
nsAutoAnimationMutationBatch mb(aTarget.mElement->OwnerDoc());
// Build the updated animations list, extracting matching animations from
// the existing collection as we go.
OwningCSSAnimationPtrArray newAnimations =
BuildAnimations(mPresContext, aTarget, aStyleDisplay, aBuilder,
collection, mMaybeReferencedAnimations);
if (newAnimations.IsEmpty()) {
if (collection) {
collection->Destroy();
}
return;
}
if (!collection) {
bool createdCollection = false;
collection = CSSAnimationCollection::GetOrCreateAnimationCollection(
aTarget.mElement, aTarget.mPseudoType, &createdCollection);
if (!collection) {
MOZ_ASSERT(!createdCollection, "outparam should agree with return value");
NS_WARNING("allocating collection failed");
return;
}
if (createdCollection) {
AddElementCollection(collection);
}
}
collection->mAnimations.SwapElements(newAnimations);
// Cancel removed animations
for (size_t newAnimIdx = newAnimations.Length(); newAnimIdx-- != 0;) {
aBuilder.NotifyNewOrRemovedAnimation(*newAnimations[newAnimIdx]);
newAnimations[newAnimIdx]->CancelFromStyle(PostRestyleMode::IfNeeded);
}
}
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