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gecko-dev/layout/style/nsAnimationManager.cpp

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/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
/* 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/EffectCompositor.h"
#include "mozilla/EffectSet.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/StyleAnimationValue.h"
#include "mozilla/dom/DocumentTimeline.h"
#include "mozilla/dom/KeyframeEffect.h"
#include "nsPresContext.h"
#include "nsStyleSet.h"
#include "nsStyleChangeList.h"
#include "nsCSSRules.h"
#include "mozilla/RestyleManager.h"
#include "nsLayoutUtils.h"
#include "nsIFrame.h"
#include "nsIDocument.h"
#include "nsDOMMutationObserver.h"
#include <math.h>
using namespace mozilla;
using namespace mozilla::css;
using mozilla::dom::Animation;
using mozilla::dom::AnimationPlayState;
using mozilla::dom::KeyframeEffectReadOnly;
using mozilla::dom::CSSAnimation;
////////////////////////// CSSAnimation ////////////////////////////
JSObject*
CSSAnimation::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
return dom::CSSAnimationBinding::Wrap(aCx, this, aGivenProto);
}
mozilla::dom::Promise*
CSSAnimation::GetReady(ErrorResult& aRv)
{
FlushStyle();
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.
FlushStyle();
return Animation::PlayStateFromJS();
}
void
CSSAnimation::PlayFromJS(ErrorResult& aRv)
{
// Note that flushing style below might trigger calls to
// PlayFromStyle()/PauseFromStyle() on this object.
FlushStyle();
Animation::PlayFromJS(aRv);
}
void
CSSAnimation::PlayFromStyle()
{
mIsStylePaused = false;
if (!mPauseShouldStick) {
ErrorResult rv;
DoPlay(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;
DoPause(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(aOther.mOwningElement);
}
// 2. (Same element and pseudo): Sort by position in animation-name
return mAnimationIndex < aOther.mAnimationIndex;
}
void
CSSAnimation::QueueEvents()
{
if (!mEffect) {
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;
}
dom::Element* owningElement;
CSSPseudoElementType owningPseudoType;
mOwningElement.GetElement(owningElement, owningPseudoType);
MOZ_ASSERT(owningElement, "Owning element should be set");
// Get the nsAnimationManager so we can queue events on it
nsPresContext* presContext = mOwningElement.GetRenderedPresContext();
if (!presContext) {
return;
}
nsAnimationManager* manager = presContext->AnimationManager();
ComputedTiming computedTiming = mEffect->GetComputedTiming();
if (computedTiming.mPhase == ComputedTiming::AnimationPhase::Null) {
return; // do nothing
}
// Note that script can change the start time, so we have to handle moving
// backwards through the animation as well as forwards. An 'animationstart'
// is dispatched if we enter the active phase (regardless if that is from
// before or after the animation's active phase). An 'animationend' is
// dispatched if we leave the active phase (regardless if that is to before
// or after the animation's active phase).
bool wasActive = mPreviousPhaseOrIteration != PREVIOUS_PHASE_BEFORE &&
mPreviousPhaseOrIteration != PREVIOUS_PHASE_AFTER;
bool isActive =
computedTiming.mPhase == ComputedTiming::AnimationPhase::Active;
bool isSameIteration =
computedTiming.mCurrentIteration == mPreviousPhaseOrIteration;
bool skippedActivePhase =
(mPreviousPhaseOrIteration == PREVIOUS_PHASE_BEFORE &&
computedTiming.mPhase == ComputedTiming::AnimationPhase::After) ||
(mPreviousPhaseOrIteration == PREVIOUS_PHASE_AFTER &&
computedTiming.mPhase == ComputedTiming::AnimationPhase::Before);
MOZ_ASSERT(!skippedActivePhase || (!isActive && !wasActive),
"skippedActivePhase only makes sense if we were & are inactive");
if (computedTiming.mPhase == ComputedTiming::AnimationPhase::Before) {
mPreviousPhaseOrIteration = PREVIOUS_PHASE_BEFORE;
} else if (computedTiming.mPhase == ComputedTiming::AnimationPhase::Active) {
mPreviousPhaseOrIteration = computedTiming.mCurrentIteration;
} else if (computedTiming.mPhase == ComputedTiming::AnimationPhase::After) {
mPreviousPhaseOrIteration = PREVIOUS_PHASE_AFTER;
}
EventMessage message;
if (!wasActive && isActive) {
message = eAnimationStart;
} else if (wasActive && !isActive) {
message = eAnimationEnd;
} else if (wasActive && isActive && !isSameIteration) {
message = eAnimationIteration;
} else if (skippedActivePhase) {
// First notifying for start of 0th iteration by appending an
// 'animationstart':
StickyTimeDuration elapsedTime =
std::min(StickyTimeDuration(InitialAdvance()),
computedTiming.mActiveDuration);
manager->QueueEvent(AnimationEventInfo(owningElement, owningPseudoType,
eAnimationStart, mAnimationName,
elapsedTime,
ElapsedTimeToTimeStamp(elapsedTime),
this));
// Then have the shared code below append an 'animationend':
message = eAnimationEnd;
} else {
return; // No events need to be sent
}
StickyTimeDuration elapsedTime;
if (message == eAnimationStart || message == eAnimationIteration) {
StickyTimeDuration iterationStart = computedTiming.mDuration *
computedTiming.mCurrentIteration;
elapsedTime = std::max(iterationStart, StickyTimeDuration(InitialAdvance()));
} else {
MOZ_ASSERT(message == eAnimationEnd);
elapsedTime = computedTiming.mActiveDuration;
}
manager->QueueEvent(AnimationEventInfo(owningElement, owningPseudoType,
message, mAnimationName, elapsedTime,
ElapsedTimeToTimeStamp(elapsedTime),
this));
}
void
CSSAnimation::UpdateTiming(SeekFlag aSeekFlag, SyncNotifyFlag aSyncNotifyFlag)
{
if (mNeedsNewAnimationIndexWhenRun &&
PlayState() != AnimationPlayState::Idle) {
mAnimationIndex = sNextAnimationIndex++;
mNeedsNewAnimationIndexWhenRun = false;
}
Animation::UpdateTiming(aSeekFlag, aSyncNotifyFlag);
}
TimeStamp
CSSAnimation::ElapsedTimeToTimeStamp(const StickyTimeDuration&
aElapsedTime) const
{
// Initializes to null. We always return this object to benefit from
// return-value-optimization.
TimeStamp result;
// Currently we may dispatch animationstart events before resolving
// mStartTime if we have a delay <= 0. This will change in bug 1134163
// but until then we should just use the latest refresh driver time as
// the event timestamp in that case.
if (!mEffect || mStartTime.IsNull()) {
nsPresContext* presContext = GetPresContext();
if (presContext) {
result = presContext->RefreshDriver()->MostRecentRefresh();
}
return result;
}
result = AnimationTimeToTimeStamp(aElapsedTime +
mEffect->SpecifiedTiming().mDelay);
return result;
}
////////////////////////// nsAnimationManager ////////////////////////////
NS_IMPL_CYCLE_COLLECTION(nsAnimationManager, mEventDispatcher)
NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(nsAnimationManager, AddRef)
NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(nsAnimationManager, Release)
// 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 nsAString& 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;
}
static void
UpdateOldAnimationPropertiesWithNew(
CSSAnimation& aOld,
TimingParams& aNewTiming,
InfallibleTArray<AnimationProperty>& aNewProperties,
bool aNewIsStylePaused)
{
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()) {
KeyframeEffectReadOnly* oldEffect = aOld.GetEffect();
animationChanged =
oldEffect->SpecifiedTiming() != aNewTiming;
oldEffect->SetSpecifiedTiming(aNewTiming);
animationChanged |=
oldEffect->UpdateProperties(aNewProperties);
}
// 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);
}
}
void
nsAnimationManager::UpdateAnimations(nsStyleContext* aStyleContext,
mozilla::dom::Element* aElement)
{
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");
// 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.
const nsStyleDisplay* disp = aStyleContext->StyleDisplay();
CSSAnimationCollection* collection =
CSSAnimationCollection::GetAnimationCollection(aElement,
aStyleContext->
GetPseudoType());
if (!collection &&
disp->mAnimationNameCount == 1 &&
disp->mAnimations[0].GetName().IsEmpty()) {
return;
}
nsAutoAnimationMutationBatch mb(aElement->OwnerDoc());
// Build the updated animations list, extracting matching animations from
// the existing collection as we go.
OwningCSSAnimationPtrArray newAnimations;
if (!aStyleContext->IsInDisplayNoneSubtree()) {
BuildAnimations(aStyleContext, aElement, collection, newAnimations);
}
if (newAnimations.IsEmpty()) {
if (collection) {
collection->Destroy();
}
return;
}
if (collection) {
EffectSet* effectSet =
EffectSet::GetEffectSet(aElement, aStyleContext->GetPseudoType());
if (effectSet) {
effectSet->UpdateAnimationGeneration(mPresContext);
}
} else {
bool createdCollection = false;
collection =
CSSAnimationCollection::GetOrCreateAnimationCollection(
aElement, aStyleContext->GetPseudoType(), &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; ) {
newAnimations[newAnimIdx]->CancelFromStyle();
}
EffectCompositor::UpdateCascadeResults(aElement,
aStyleContext->GetPseudoType(),
aStyleContext);
mPresContext->EffectCompositor()->
MaybeUpdateAnimationRule(aElement,
aStyleContext->GetPseudoType(),
EffectCompositor::CascadeLevel::Animations);
// We don't actually dispatch the pending events now. We'll either
// dispatch them the next time we get a refresh driver notification
// or the next time somebody calls
// nsPresShell::FlushPendingNotifications.
if (mEventDispatcher.HasQueuedEvents()) {
mPresContext->Document()->SetNeedStyleFlush();
}
}
void
nsAnimationManager::StopAnimationsForElement(
mozilla::dom::Element* aElement,
mozilla::CSSPseudoElementType aPseudoType)
{
MOZ_ASSERT(aElement);
CSSAnimationCollection* collection =
CSSAnimationCollection::GetAnimationCollection(aElement, aPseudoType);
if (!collection) {
return;
}
nsAutoAnimationMutationBatch mb(aElement->OwnerDoc());
collection->Destroy();
}
struct KeyframeData {
float mKey;
uint32_t mIndex; // store original order since sort algorithm is not stable
nsCSSKeyframeRule *mRule;
};
struct KeyframeDataComparator {
bool Equals(const KeyframeData& A, const KeyframeData& B) const {
return A.mKey == B.mKey && A.mIndex == B.mIndex;
}
bool LessThan(const KeyframeData& A, const KeyframeData& B) const {
return A.mKey < B.mKey || (A.mKey == B.mKey && A.mIndex < B.mIndex);
}
};
class ResolvedStyleCache {
public:
ResolvedStyleCache() : mCache() {}
nsStyleContext* Get(nsPresContext *aPresContext,
nsStyleContext *aParentStyleContext,
Declaration* aKeyframeDeclaration);
private:
nsRefPtrHashtable<nsPtrHashKey<Declaration>, nsStyleContext> mCache;
};
nsStyleContext*
ResolvedStyleCache::Get(nsPresContext *aPresContext,
nsStyleContext *aParentStyleContext,
Declaration* aKeyframeDeclaration)
{
// FIXME (spec): The css3-animations spec isn't very clear about how
// properties are resolved when they have values that depend on other
// properties (e.g., values in 'em'). I presume that they're resolved
// relative to the other styles of the element. The question is
// whether they are resolved relative to other animations: I assume
// that they're not, since that would prevent us from caching a lot of
// data that we'd really like to cache (in particular, the
// StyleAnimationValue values in AnimationPropertySegment).
nsStyleContext *result = mCache.GetWeak(aKeyframeDeclaration);
if (!result) {
aKeyframeDeclaration->SetImmutable();
// The spec says that !important declarations should just be ignored
MOZ_ASSERT(!aKeyframeDeclaration->HasImportantData(),
"Keyframe rule has !important data");
nsCOMArray<nsIStyleRule> rules;
rules.AppendObject(aKeyframeDeclaration);
MOZ_ASSERT(aPresContext->StyleSet()->IsGecko(),
"ServoStyleSet should not use nsAnimationManager for "
"animations");
RefPtr<nsStyleContext> resultStrong = aPresContext->StyleSet()->AsGecko()->
ResolveStyleByAddingRules(aParentStyleContext, rules);
mCache.Put(aKeyframeDeclaration, resultStrong);
result = resultStrong;
}
return result;
}
class MOZ_STACK_CLASS CSSAnimationBuilder final {
public:
CSSAnimationBuilder(nsStyleContext* aStyleContext,
dom::Element* aTarget,
nsAnimationManager::CSSAnimationCollection* aCollection)
: mStyleContext(aStyleContext)
, mTarget(aTarget)
, mCollection(aCollection)
{
MOZ_ASSERT(aStyleContext);
MOZ_ASSERT(aTarget);
mTimeline = mTarget->OwnerDoc()->Timeline();
}
// Returns a new animation set up with given StyleAnimation and
// keyframe rules.
// Or returns an existing animation matching StyleAnimation's name updated
// with the new StyleAnimation and keyframe rules.
already_AddRefed<CSSAnimation>
Build(nsPresContext* aPresContext,
const StyleAnimation& aSrc,
const nsCSSKeyframesRule* aRule);
private:
void BuildAnimationProperties(nsPresContext* aPresContext,
const StyleAnimation& aSrc,
const nsCSSKeyframesRule* aRule,
InfallibleTArray<AnimationProperty>& aResult);
bool BuildSegment(InfallibleTArray<mozilla::AnimationPropertySegment>&
aSegments,
nsCSSProperty aProperty,
const mozilla::StyleAnimation& aAnimation,
float aFromKey, nsStyleContext* aFromContext,
mozilla::css::Declaration* aFromDeclaration,
float aToKey, nsStyleContext* aToContext);
static TimingParams TimingParamsFrom(
const StyleAnimation& aStyleAnimation)
{
TimingParams timing;
timing.mDuration.emplace(StickyTimeDuration::FromMilliseconds(
aStyleAnimation.GetDuration()));
timing.mDelay = TimeDuration::FromMilliseconds(aStyleAnimation.GetDelay());
timing.mIterations = aStyleAnimation.GetIterationCount();
timing.mDirection = aStyleAnimation.GetDirection();
timing.mFill = aStyleAnimation.GetFillMode();
return timing;
}
RefPtr<nsStyleContext> mStyleContext;
RefPtr<dom::Element> mTarget;
RefPtr<dom::DocumentTimeline> mTimeline;
ResolvedStyleCache mResolvedStyles;
RefPtr<nsStyleContext> mStyleWithoutAnimation;
// Existing collection, nullptr if the target element has no animations.
nsAnimationManager::CSSAnimationCollection* mCollection;
};
already_AddRefed<CSSAnimation>
CSSAnimationBuilder::Build(nsPresContext* aPresContext,
const StyleAnimation& aSrc,
const nsCSSKeyframesRule* aRule)
{
MOZ_ASSERT(aPresContext);
MOZ_ASSERT(aRule);
TimingParams timing = TimingParamsFrom(aSrc);
InfallibleTArray<AnimationProperty> animationProperties;
BuildAnimationProperties(aPresContext, aSrc, aRule, animationProperties);
bool isStylePaused =
aSrc.GetPlayState() == NS_STYLE_ANIMATION_PLAY_STATE_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(aSrc.GetName(), mCollection);
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,
timing,
animationProperties,
isStylePaused);
return oldAnim.forget();
}
RefPtr<KeyframeEffectReadOnly> effect =
new KeyframeEffectReadOnly(aPresContext->Document(), mTarget,
mStyleContext->GetPseudoType(), timing);
effect->Properties() = Move(animationProperties);
RefPtr<CSSAnimation> animation =
new CSSAnimation(aPresContext->Document()->GetScopeObject(),
aSrc.GetName());
animation->SetOwningElement(
OwningElementRef(*mTarget, mStyleContext->GetPseudoType()));
animation->SetTimeline(mTimeline);
animation->SetEffect(effect);
if (isStylePaused) {
animation->PauseFromStyle();
} else {
animation->PlayFromStyle();
}
// FIXME: Bug 1134163 - We shouldn't queue animationstart events
// until the animation is actually ready to run. However, we
// currently have some tests that assume that these events are
// dispatched within the same tick as the animation is added
// so we need to queue up any animationstart events from newly-created
// animations.
animation->QueueEvents();
return animation.forget();
}
void
CSSAnimationBuilder::BuildAnimationProperties(
nsPresContext* aPresContext,
const StyleAnimation& aSrc,
const nsCSSKeyframesRule* aRule,
InfallibleTArray<AnimationProperty>& aResult)
{
// While current drafts of css3-animations say that later keyframes
// with the same key entirely replace earlier ones (no cascading),
// this is a bad idea and contradictory to the rest of CSS. So
// we're going to keep all the keyframes for each key and then do
// the replacement on a per-property basis rather than a per-rule
// basis, just like everything else in CSS.
AutoTArray<KeyframeData, 16> sortedKeyframes;
for (uint32_t ruleIdx = 0, ruleEnd = aRule->StyleRuleCount();
ruleIdx != ruleEnd; ++ruleIdx) {
css::Rule* cssRule = aRule->GetStyleRuleAt(ruleIdx);
MOZ_ASSERT(cssRule, "must have rule");
MOZ_ASSERT(cssRule->GetType() == css::Rule::KEYFRAME_RULE,
"must be keyframe rule");
nsCSSKeyframeRule *kfRule = static_cast<nsCSSKeyframeRule*>(cssRule);
const nsTArray<float> &keys = kfRule->GetKeys();
for (uint32_t keyIdx = 0, keyEnd = keys.Length();
keyIdx != keyEnd; ++keyIdx) {
float key = keys[keyIdx];
// FIXME (spec): The spec doesn't say what to do with
// out-of-range keyframes. We'll ignore them.
if (0.0f <= key && key <= 1.0f) {
KeyframeData *data = sortedKeyframes.AppendElement();
data->mKey = key;
data->mIndex = ruleIdx;
data->mRule = kfRule;
}
}
}
sortedKeyframes.Sort(KeyframeDataComparator());
if (sortedKeyframes.Length() == 0) {
// no segments
return;
}
// Record the properties that are present in any keyframe rules we
// are using.
nsCSSPropertySet properties;
for (uint32_t kfIdx = 0, kfEnd = sortedKeyframes.Length();
kfIdx != kfEnd; ++kfIdx) {
css::Declaration *decl = sortedKeyframes[kfIdx].mRule->Declaration();
for (uint32_t propIdx = 0, propEnd = decl->Count();
propIdx != propEnd; ++propIdx) {
nsCSSProperty prop = decl->GetPropertyAt(propIdx);
if (prop != eCSSPropertyExtra_variable) {
// CSS Variables are not animatable
properties.AddProperty(prop);
}
}
}
for (nsCSSProperty prop = nsCSSProperty(0);
prop < eCSSProperty_COUNT_no_shorthands;
prop = nsCSSProperty(prop + 1)) {
if (!properties.HasProperty(prop) ||
nsCSSProps::kAnimTypeTable[prop] == eStyleAnimType_None) {
continue;
}
// Build a list of the keyframes to use for this property. This
// means we need every keyframe with the property in it, except
// for those keyframes where a later keyframe with the *same key*
// also has the property.
AutoTArray<uint32_t, 16> keyframesWithProperty;
float lastKey = 100.0f; // an invalid key
for (uint32_t kfIdx = 0, kfEnd = sortedKeyframes.Length();
kfIdx != kfEnd; ++kfIdx) {
KeyframeData &kf = sortedKeyframes[kfIdx];
if (!kf.mRule->Declaration()->HasProperty(prop)) {
continue;
}
if (kf.mKey == lastKey) {
// Replace previous occurrence of same key.
keyframesWithProperty[keyframesWithProperty.Length() - 1] = kfIdx;
} else {
keyframesWithProperty.AppendElement(kfIdx);
}
lastKey = kf.mKey;
}
AnimationProperty &propData = *aResult.AppendElement();
propData.mProperty = prop;
KeyframeData *fromKeyframe = nullptr;
RefPtr<nsStyleContext> fromContext;
bool interpolated = true;
for (uint32_t wpIdx = 0, wpEnd = keyframesWithProperty.Length();
wpIdx != wpEnd; ++wpIdx) {
uint32_t kfIdx = keyframesWithProperty[wpIdx];
KeyframeData &toKeyframe = sortedKeyframes[kfIdx];
RefPtr<nsStyleContext> toContext =
mResolvedStyles.Get(aPresContext, mStyleContext,
toKeyframe.mRule->Declaration());
if (fromKeyframe) {
interpolated = interpolated &&
BuildSegment(propData.mSegments, prop, aSrc,
fromKeyframe->mKey, fromContext,
fromKeyframe->mRule->Declaration(),
toKeyframe.mKey, toContext);
} else {
if (toKeyframe.mKey != 0.0f) {
// There's no data for this property at 0%, so use the
// cascaded value above us.
if (!mStyleWithoutAnimation) {
MOZ_ASSERT(aPresContext->StyleSet()->IsGecko(),
"ServoStyleSet should not use nsAnimationManager for "
"animations");
mStyleWithoutAnimation = aPresContext->StyleSet()->AsGecko()->
ResolveStyleWithoutAnimation(mTarget, mStyleContext,
eRestyle_AllHintsWithAnimations);
}
interpolated = interpolated &&
BuildSegment(propData.mSegments, prop, aSrc,
0.0f, mStyleWithoutAnimation, nullptr,
toKeyframe.mKey, toContext);
}
}
fromContext = toContext;
fromKeyframe = &toKeyframe;
}
if (fromKeyframe->mKey != 1.0f) {
// There's no data for this property at 100%, so use the
// cascaded value above us.
if (!mStyleWithoutAnimation) {
MOZ_ASSERT(aPresContext->StyleSet()->IsGecko(),
"ServoStyleSet should not use nsAnimationManager for "
"animations");
mStyleWithoutAnimation = aPresContext->StyleSet()->AsGecko()->
ResolveStyleWithoutAnimation(mTarget, mStyleContext,
eRestyle_AllHintsWithAnimations);
}
interpolated = interpolated &&
BuildSegment(propData.mSegments, prop, aSrc,
fromKeyframe->mKey, fromContext,
fromKeyframe->mRule->Declaration(),
1.0f, mStyleWithoutAnimation);
}
// If we failed to build any segments due to inability to
// interpolate, remove the property from the animation. (It's not
// clear if this is the right thing to do -- we could run some of
// the segments, but it's really not clear whether we should skip
// values (which?) or skip segments, so best to skip the whole
// thing for now.)
if (!interpolated) {
aResult.RemoveElementAt(aResult.Length() - 1);
}
}
}
bool
CSSAnimationBuilder::BuildSegment(InfallibleTArray<AnimationPropertySegment>&
aSegments,
nsCSSProperty aProperty,
const StyleAnimation& aAnimation,
float aFromKey, nsStyleContext* aFromContext,
mozilla::css::Declaration* aFromDeclaration,
float aToKey, nsStyleContext* aToContext)
{
StyleAnimationValue fromValue, toValue, dummyValue;
if (!CommonAnimationManager<CSSAnimation>::ExtractComputedValueForTransition(
aProperty, aFromContext, fromValue) ||
!CommonAnimationManager<CSSAnimation>::ExtractComputedValueForTransition(
aProperty, aToContext, toValue) ||
// Check that we can interpolate between these values
// (If this is ever a performance problem, we could add a
// CanInterpolate method, but it seems fine for now.)
!StyleAnimationValue::Interpolate(aProperty, fromValue, toValue,
0.5, dummyValue)) {
return false;
}
AnimationPropertySegment &segment = *aSegments.AppendElement();
segment.mFromValue = fromValue;
segment.mToValue = toValue;
segment.mFromKey = aFromKey;
segment.mToKey = aToKey;
const nsTimingFunction *tf;
if (aFromDeclaration &&
aFromDeclaration->HasProperty(eCSSProperty_animation_timing_function)) {
tf = &aFromContext->StyleDisplay()->mAnimations[0].GetTimingFunction();
} else {
tf = &aAnimation.GetTimingFunction();
}
if (tf->mType != nsTimingFunction::Type::Linear) {
ComputedTimingFunction computedTimingFunction;
computedTimingFunction.Init(*tf);
segment.mTimingFunction = Some(computedTimingFunction);
}
return true;
}
void
nsAnimationManager::BuildAnimations(nsStyleContext* aStyleContext,
dom::Element* aTarget,
CSSAnimationCollection* aCollection,
OwningCSSAnimationPtrArray& aAnimations)
{
MOZ_ASSERT(aAnimations.IsEmpty(), "expect empty array");
const nsStyleDisplay *disp = aStyleContext->StyleDisplay();
CSSAnimationBuilder builder(aStyleContext, aTarget, aCollection);
for (size_t animIdx = disp->mAnimationNameCount; animIdx-- != 0;) {
const StyleAnimation& src = disp->mAnimations[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.
MOZ_ASSERT(mPresContext->StyleSet()->IsGecko(),
"ServoStyleSet should not use nsAnimationManager for "
"animations");
nsCSSKeyframesRule* rule =
src.GetName().IsEmpty()
? nullptr
: mPresContext->StyleSet()->AsGecko()->KeyframesRuleForName(src.GetName());
if (!rule) {
continue;
}
RefPtr<CSSAnimation> dest = builder.Build(mPresContext, src, rule);
dest->SetAnimationIndex(static_cast<uint64_t>(animIdx));
aAnimations.AppendElement(dest);
}
}
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