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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/EventDispatcher.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/StyleAnimationValue.h"
#include "nsPresContext.h"
#include "nsStyleSet.h"
#include "nsStyleChangeList.h"
#include "nsCSSRules.h"
#include "RestyleManager.h"
#include "nsLayoutUtils.h"
#include "nsIFrame.h"
#include "nsIDocument.h"
#include <math.h>
using namespace mozilla;
using namespace mozilla::css;
using mozilla::dom::Animation;
using mozilla::dom::AnimationPlayer;
using mozilla::CSSAnimationPlayer;
void
CSSAnimationPlayer::Play()
{
mPauseShouldStick = false;
AnimationPlayer::Play();
}
void
CSSAnimationPlayer::Pause()
{
mPauseShouldStick = true;
AnimationPlayer::Pause();
}
mozilla::dom::AnimationPlayState
CSSAnimationPlayer::PlayStateFromJS() const
{
// Flush style to ensure that any properties controlling animation state
// (e.g. animation-play-state) are fully updated.
FlushStyle();
return AnimationPlayer::PlayStateFromJS();
}
void
CSSAnimationPlayer::PlayFromJS()
{
// Note that flushing style below might trigger calls to
// PlayFromStyle()/PauseFromStyle() on this object.
FlushStyle();
AnimationPlayer::PlayFromJS();
}
void
CSSAnimationPlayer::PlayFromStyle()
{
mIsStylePaused = false;
if (!mPauseShouldStick) {
DoPlay();
}
}
void
CSSAnimationPlayer::PauseFromStyle()
{
// Check if the pause state is being overridden
if (mIsStylePaused) {
return;
}
mIsStylePaused = true;
DoPause();
}
void
CSSAnimationPlayer::QueueEvents(EventArray& aEventsToDispatch)
{
if (!mSource) {
return;
}
ComputedTiming computedTiming = mSource->GetComputedTiming();
dom::Element* target;
nsCSSPseudoElements::Type targetPseudoType;
mSource->GetTarget(target, targetPseudoType);
switch (computedTiming.mPhase) {
case ComputedTiming::AnimationPhase_Null:
case ComputedTiming::AnimationPhase_Before:
// Do nothing
break;
case ComputedTiming::AnimationPhase_Active:
// Dispatch 'animationstart' or 'animationiteration' when needed.
if (computedTiming.mCurrentIteration != mLastNotification) {
// Notify 'animationstart' even if a negative delay puts us
// past the first iteration.
// Note that when somebody changes the animation-duration
// dynamically, this will fire an extra iteration event
// immediately in many cases. It's not clear to me if that's the
// right thing to do.
uint32_t message = mLastNotification == LAST_NOTIFICATION_NONE
? NS_ANIMATION_START
: NS_ANIMATION_ITERATION;
mLastNotification = computedTiming.mCurrentIteration;
TimeDuration iterationStart =
mSource->Timing().mIterationDuration *
computedTiming.mCurrentIteration;
TimeDuration elapsedTime =
std::max(iterationStart, mSource->InitialAdvance());
AnimationEventInfo ei(target, Name(), message,
StickyTimeDuration(elapsedTime),
PseudoTypeAsString(targetPseudoType));
aEventsToDispatch.AppendElement(ei);
}
break;
case ComputedTiming::AnimationPhase_After:
// If we skipped the animation interval entirely, dispatch
// 'animationstart' first
if (mLastNotification == LAST_NOTIFICATION_NONE) {
// Notifying for start of 0th iteration.
// (This is overwritten below but we set it here to maintain
// internal consistency.)
mLastNotification = 0;
StickyTimeDuration elapsedTime =
std::min(StickyTimeDuration(mSource->InitialAdvance()),
computedTiming.mActiveDuration);
AnimationEventInfo ei(target, Name(), NS_ANIMATION_START,
elapsedTime,
PseudoTypeAsString(targetPseudoType));
aEventsToDispatch.AppendElement(ei);
}
// Dispatch 'animationend' when needed.
if (mLastNotification != LAST_NOTIFICATION_END) {
mLastNotification = LAST_NOTIFICATION_END;
AnimationEventInfo ei(target, Name(), NS_ANIMATION_END,
computedTiming.mActiveDuration,
PseudoTypeAsString(targetPseudoType));
aEventsToDispatch.AppendElement(ei);
}
break;
}
}
CommonAnimationManager*
CSSAnimationPlayer::GetAnimationManager() const
{
nsPresContext* context = GetPresContext();
if (!context) {
return nullptr;
}
return context->AnimationManager();
}
/* static */ nsString
CSSAnimationPlayer::PseudoTypeAsString(nsCSSPseudoElements::Type aPseudoType)
{
switch (aPseudoType) {
case nsCSSPseudoElements::ePseudo_before:
return NS_LITERAL_STRING("::before");
case nsCSSPseudoElements::ePseudo_after:
return NS_LITERAL_STRING("::after");
default:
return EmptyString();
}
}
void
nsAnimationManager::UpdateStyleAndEvents(AnimationPlayerCollection*
aCollection,
TimeStamp aRefreshTime,
EnsureStyleRuleFlags aFlags)
{
aCollection->EnsureStyleRuleFor(aRefreshTime, aFlags);
QueueEvents(aCollection, mPendingEvents);
}
void
nsAnimationManager::QueueEvents(AnimationPlayerCollection* aCollection,
EventArray& aEventsToDispatch)
{
for (size_t playerIdx = aCollection->mPlayers.Length(); playerIdx-- != 0; ) {
CSSAnimationPlayer* player =
aCollection->mPlayers[playerIdx]->AsCSSAnimationPlayer();
MOZ_ASSERT(player, "Expected a collection of CSS Animation players");
player->QueueEvents(aEventsToDispatch);
}
}
/* virtual */ size_t
nsAnimationManager::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
{
return CommonAnimationManager::SizeOfExcludingThis(aMallocSizeOf);
// Measurement of the following members may be added later if DMD finds it is
// worthwhile:
// - mPendingEvents
}
/* virtual */ size_t
nsAnimationManager::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
{
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}
nsIStyleRule*
nsAnimationManager::CheckAnimationRule(nsStyleContext* aStyleContext,
mozilla::dom::Element* aElement)
{
// FIXME (bug 960465): This test should go away.
if (!mPresContext->RestyleManager()->IsProcessingAnimationStyleChange()) {
if (!mPresContext->IsDynamic()) {
// For print or print preview, ignore animations.
return nullptr;
}
// 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();
AnimationPlayerCollection* collection =
GetAnimationPlayers(aElement, aStyleContext->GetPseudoType(), false);
if (!collection &&
disp->mAnimationNameCount == 1 &&
disp->mAnimations[0].GetName().IsEmpty()) {
return nullptr;
}
// build the animations list
dom::AnimationTimeline* timeline = aElement->OwnerDoc()->Timeline();
AnimationPlayerPtrArray newPlayers;
BuildAnimations(aStyleContext, aElement, timeline, newPlayers);
if (newPlayers.IsEmpty()) {
if (collection) {
collection->Destroy();
}
return nullptr;
}
if (collection) {
collection->mStyleRule = nullptr;
collection->mStyleRuleRefreshTime = TimeStamp();
collection->UpdateAnimationGeneration(mPresContext);
// 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
// (or potentially optimize BuildAnimations to avoid rebuilding it
// in the first place).
if (!collection->mPlayers.IsEmpty()) {
for (size_t newIdx = newPlayers.Length(); newIdx-- != 0;) {
AnimationPlayer* newPlayer = newPlayers[newIdx];
// Find the matching animation with this name in the old list
// of animations. We iterate through both lists in a backwards
// direction which means that if there are more animations in
// the new list of animations with a given name than in the old
// list, it will be the animations towards the of the beginning of
// the list that do not match and are treated as new animations.
nsRefPtr<CSSAnimationPlayer> oldPlayer;
size_t oldIdx = collection->mPlayers.Length();
while (oldIdx-- != 0) {
CSSAnimationPlayer* a =
collection->mPlayers[oldIdx]->AsCSSAnimationPlayer();
MOZ_ASSERT(a, "All players in the CSS Animation collection should"
" be CSSAnimationPlayer objects");
if (a->Name() == newPlayer->Name()) {
oldPlayer = a;
break;
}
}
if (!oldPlayer) {
continue;
}
// Update the old from the new so we can keep the original object
// identity (and any expando properties attached to it).
if (oldPlayer->GetSource() && newPlayer->GetSource()) {
Animation* oldAnim = oldPlayer->GetSource();
Animation* newAnim = newPlayer->GetSource();
oldAnim->Timing() = newAnim->Timing();
oldAnim->Properties() = newAnim->Properties();
}
// Reset compositor state so animation will be re-synchronized.
oldPlayer->ClearIsRunningOnCompositor();
// Handle changes in play state.
// CSSAnimationPlayer 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 newPlayer->IsStylePaused() but that requires
// downcasting to CSSAnimationPlayer and we happen to know that
// newPlayer will only ever be paused by calling PauseFromStyle
// making IsPaused synonymous in this case.)
if (!oldPlayer->IsStylePaused() && newPlayer->IsPaused()) {
oldPlayer->PauseFromStyle();
} else if (oldPlayer->IsStylePaused() && !newPlayer->IsPaused()) {
oldPlayer->PlayFromStyle();
}
// Replace new animation with the (updated) old one and remove the
// old one from the array so we don't try to match it any more.
//
// Although we're doing this while iterating this is safe because
// we're not changing the length of newPlayers and we've finished
// iterating over the list of old iterations.
newPlayer = nullptr;
newPlayers.ReplaceElementAt(newIdx, oldPlayer);
collection->mPlayers.RemoveElementAt(oldIdx);
}
}
} else {
collection =
GetAnimationPlayers(aElement, aStyleContext->GetPseudoType(), true);
}
collection->mPlayers.SwapElements(newPlayers);
collection->mNeedsRefreshes = true;
collection->Tick();
TimeStamp refreshTime = mPresContext->RefreshDriver()->MostRecentRefresh();
UpdateStyleAndEvents(collection, refreshTime,
EnsureStyleRule_IsNotThrottled);
// We don't actually dispatch the mPendingEvents now. We'll either
// dispatch them the next time we get a refresh driver notification
// or the next time somebody calls
// nsPresShell::FlushPendingNotifications.
if (!mPendingEvents.IsEmpty()) {
mPresContext->Document()->SetNeedStyleFlush();
}
}
return GetAnimationRule(aElement, aStyleContext->GetPseudoType());
}
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,
nsCSSKeyframeRule *aKeyframe);
private:
nsRefPtrHashtable<nsPtrHashKey<nsCSSKeyframeRule>, nsStyleContext> mCache;
};
nsStyleContext*
ResolvedStyleCache::Get(nsPresContext *aPresContext,
nsStyleContext *aParentStyleContext,
nsCSSKeyframeRule *aKeyframe)
{
// 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(aKeyframe);
if (!result) {
nsCOMArray<nsIStyleRule> rules;
rules.AppendObject(aKeyframe);
nsRefPtr<nsStyleContext> resultStrong = aPresContext->StyleSet()->
ResolveStyleByAddingRules(aParentStyleContext, rules);
mCache.Put(aKeyframe, resultStrong);
result = resultStrong;
}
return result;
}
void
nsAnimationManager::BuildAnimations(nsStyleContext* aStyleContext,
dom::Element* aTarget,
dom::AnimationTimeline* aTimeline,
AnimationPlayerPtrArray& aPlayers)
{
NS_ABORT_IF_FALSE(aPlayers.IsEmpty(), "expect empty array");
ResolvedStyleCache resolvedStyles;
const nsStyleDisplay *disp = aStyleContext->StyleDisplay();
Nullable<TimeDuration> now = aTimeline->GetCurrentTime();
for (size_t animIdx = 0, animEnd = disp->mAnimationNameCount;
animIdx != animEnd; ++animIdx) {
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 AnimationPlayer for them.
nsCSSKeyframesRule* rule =
src.GetName().IsEmpty()
? nullptr
: mPresContext->StyleSet()->KeyframesRuleForName(mPresContext,
src.GetName());
if (!rule) {
continue;
}
nsRefPtr<CSSAnimationPlayer> dest = new CSSAnimationPlayer(aTimeline);
aPlayers.AppendElement(dest);
AnimationTiming timing;
timing.mIterationDuration =
TimeDuration::FromMilliseconds(src.GetDuration());
timing.mDelay = TimeDuration::FromMilliseconds(src.GetDelay());
timing.mIterationCount = src.GetIterationCount();
timing.mDirection = src.GetDirection();
timing.mFillMode = src.GetFillMode();
nsRefPtr<Animation> destAnim =
new Animation(mPresContext->Document(), aTarget,
aStyleContext->GetPseudoType(), timing, src.GetName());
dest->SetSource(destAnim);
dest->mStartTime = now;
if (src.GetPlayState() == NS_STYLE_ANIMATION_PLAY_STATE_PAUSED) {
dest->PauseFromStyle();
}
// 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.
AutoInfallibleTArray<KeyframeData, 16> sortedKeyframes;
for (uint32_t ruleIdx = 0, ruleEnd = rule->StyleRuleCount();
ruleIdx != ruleEnd; ++ruleIdx) {
css::Rule* cssRule = rule->GetStyleRuleAt(ruleIdx);
NS_ABORT_IF_FALSE(cssRule, "must have rule");
NS_ABORT_IF_FALSE(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
continue;
}
// 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.
AutoInfallibleTArray<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 = *destAnim->Properties().AppendElement();
propData.mProperty = prop;
KeyframeData *fromKeyframe = nullptr;
nsRefPtr<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];
nsRefPtr<nsStyleContext> toContext =
resolvedStyles.Get(mPresContext, aStyleContext, toKeyframe.mRule);
if (fromKeyframe) {
interpolated = interpolated &&
BuildSegment(propData.mSegments, prop, src,
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.
interpolated = interpolated &&
BuildSegment(propData.mSegments, prop, src,
0.0f, aStyleContext, 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.
interpolated = interpolated &&
BuildSegment(propData.mSegments, prop, src,
fromKeyframe->mKey, fromContext,
fromKeyframe->mRule->Declaration(),
1.0f, aStyleContext);
}
// 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) {
destAnim->Properties().RemoveElementAt(
destAnim->Properties().Length() - 1);
}
}
}
}
bool
nsAnimationManager::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 (!ExtractComputedValueForTransition(aProperty, aFromContext, fromValue) ||
!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();
}
segment.mTimingFunction.Init(*tf);
return true;
}
/* virtual */ void
nsAnimationManager::WillRefresh(mozilla::TimeStamp aTime)
{
NS_ABORT_IF_FALSE(mPresContext,
"refresh driver should not notify additional observers "
"after pres context has been destroyed");
if (!mPresContext->GetPresShell()) {
// Someone might be keeping mPresContext alive past the point
// where it has been torn down; don't bother doing anything in
// this case. But do get rid of all our transitions so we stop
// triggering refreshes.
RemoveAllElementCollections();
return;
}
FlushAnimations(Can_Throttle);
}
void
nsAnimationManager::FlushAnimations(FlushFlags aFlags)
{
// FIXME: check that there's at least one style rule that's not
// in its "done" state, and if there isn't, remove ourselves from
// the refresh driver (but leave the animations!).
TimeStamp now = mPresContext->RefreshDriver()->MostRecentRefresh();
bool didThrottle = false;
for (PRCList *l = PR_LIST_HEAD(&mElementCollections);
l != &mElementCollections;
l = PR_NEXT_LINK(l)) {
AnimationPlayerCollection* collection =
static_cast<AnimationPlayerCollection*>(l);
collection->Tick();
bool canThrottleTick = aFlags == Can_Throttle &&
collection->CanPerformOnCompositorThread(
AnimationPlayerCollection::CanAnimateFlags(0)) &&
collection->CanThrottleAnimation(now);
nsRefPtr<css::AnimValuesStyleRule> oldStyleRule = collection->mStyleRule;
UpdateStyleAndEvents(collection, now, canThrottleTick
? EnsureStyleRule_IsThrottled
: EnsureStyleRule_IsNotThrottled);
if (oldStyleRule != collection->mStyleRule) {
collection->PostRestyleForAnimation(mPresContext);
} else {
didThrottle = true;
}
}
if (didThrottle) {
mPresContext->Document()->SetNeedStyleFlush();
}
DispatchEvents(); // may destroy us
}
void
nsAnimationManager::DoDispatchEvents()
{
EventArray events;
mPendingEvents.SwapElements(events);
for (uint32_t i = 0, i_end = events.Length(); i < i_end; ++i) {
AnimationEventInfo &info = events[i];
EventDispatcher::Dispatch(info.mElement, mPresContext, &info.mEvent);
if (!mPresContext) {
break;
}
}
}
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