StickyTimeDuration
Animation::EffectEnd() const
{
if (!mEffect) {
return StickyTimeDuration(0);
}
return mEffect->GetComputedTiming().mEndTime;
}
StickyTimeDuration
Animation::EffectEnd() const
{
if (!mEffect) {
return StickyTimeDuration(0);
}
return mEffect->SpecifiedTiming().EndTime();
}
StickyTimeDuration
Animation::EffectEnd() const
{
if (!mEffect) {
return StickyTimeDuration(0);
}
return mEffect->Timing().mDelay
+ mEffect->GetComputedTiming().mActiveDuration;
}
StickyTimeDuration
AnimationPlayer::SourceContentEnd() const
{
if (!mSource) {
return StickyTimeDuration(0);
}
return mSource->Timing().mDelay
+ mSource->GetComputedTiming().mActiveDuration;
}
StickyTimeDuration
Animation::ActiveDuration(const AnimationTiming& aTiming)
{
if (aTiming.mIterationCount == mozilla::PositiveInfinity<float>()) {
// An animation that repeats forever has an infinite active duration
// unless its iteration duration is zero, in which case it has a zero
// active duration.
const StickyTimeDuration zeroDuration;
return aTiming.mIterationDuration == zeroDuration
? zeroDuration
: StickyTimeDuration::Forever();
}
return StickyTimeDuration(
aTiming.mIterationDuration.MultDouble(aTiming.mIterationCount));
}
ComputedTiming
Animation::GetComputedTimingAt(const Nullable<TimeDuration>& aLocalTime,
const AnimationTiming& aTiming)
{
const TimeDuration zeroDuration;
// Currently we expect negative durations to be picked up during CSS
// parsing but when we start receiving timing parameters from other sources
// we will need to clamp negative durations here.
// For now, if we're hitting this it probably means we're overflowing
// integer arithmetic in mozilla::TimeStamp.
MOZ_ASSERT(aTiming.mIterationDuration >= zeroDuration,
"Expecting iteration duration >= 0");
// Always return the same object to benefit from return-value optimization.
ComputedTiming result;
result.mActiveDuration = ActiveDuration(aTiming);
// The default constructor for ComputedTiming sets all other members to
// values consistent with an animation that has not been sampled.
if (aLocalTime.IsNull()) {
return result;
}
const TimeDuration& localTime = aLocalTime.Value();
// When we finish exactly at the end of an iteration we need to report
// the end of the final iteration and not the start of the next iteration
// so we set up a flag for that case.
bool isEndOfFinalIteration = false;
// Get the normalized time within the active interval.
StickyTimeDuration activeTime;
if (localTime >= aTiming.mDelay + result.mActiveDuration) {
result.mPhase = ComputedTiming::AnimationPhase_After;
if (!aTiming.FillsForwards()) {
// The animation isn't active or filling at this time.
result.mTimeFraction = ComputedTiming::kNullTimeFraction;
return result;
}
activeTime = result.mActiveDuration;
// Note that infinity == floor(infinity) so this will also be true when we
// have finished an infinitely repeating animation of zero duration.
isEndOfFinalIteration =
aTiming.mIterationCount != 0.0 &&
aTiming.mIterationCount == floor(aTiming.mIterationCount);
} else if (localTime < aTiming.mDelay) {
result.mPhase = ComputedTiming::AnimationPhase_Before;
if (!aTiming.FillsBackwards()) {
// The animation isn't active or filling at this time.
result.mTimeFraction = ComputedTiming::kNullTimeFraction;
return result;
}
// activeTime is zero
} else {
MOZ_ASSERT(result.mActiveDuration != zeroDuration,
"How can we be in the middle of a zero-duration interval?");
result.mPhase = ComputedTiming::AnimationPhase_Active;
activeTime = localTime - aTiming.mDelay;
}
// Get the position within the current iteration.
StickyTimeDuration iterationTime;
if (aTiming.mIterationDuration != zeroDuration) {
iterationTime = isEndOfFinalIteration
? StickyTimeDuration(aTiming.mIterationDuration)
: activeTime % aTiming.mIterationDuration;
} /* else, iterationTime is zero */
// Determine the 0-based index of the current iteration.
if (isEndOfFinalIteration) {
result.mCurrentIteration =
aTiming.mIterationCount == NS_IEEEPositiveInfinity()
? UINT64_MAX // FIXME: When we return this via the API we'll need
// to make sure it ends up being infinity.
: static_cast<uint64_t>(aTiming.mIterationCount) - 1;
} else if (activeTime == zeroDuration) {
// If the active time is zero we're either in the first iteration
// (including filling backwards) or we have finished an animation with an
// iteration duration of zero that is filling forwards (but we're not at
// the exact end of an iteration since we deal with that above).
result.mCurrentIteration =
result.mPhase == ComputedTiming::AnimationPhase_After
? static_cast<uint64_t>(aTiming.mIterationCount) // floor
: 0;
} else {
result.mCurrentIteration =
static_cast<uint64_t>(activeTime / aTiming.mIterationDuration); // floor
}
// Normalize the iteration time into a fraction of the iteration duration.
if (result.mPhase == ComputedTiming::AnimationPhase_Before) {
result.mTimeFraction = 0.0;
} else if (result.mPhase == ComputedTiming::AnimationPhase_After) {
result.mTimeFraction = isEndOfFinalIteration
? 1.0
: fmod(aTiming.mIterationCount, 1.0f);
} else {
// We are in the active phase so the iteration duration can't be zero.
MOZ_ASSERT(aTiming.mIterationDuration != zeroDuration,
"In the active phase of a zero-duration animation?");
result.mTimeFraction =
aTiming.mIterationDuration == TimeDuration::Forever()
? 0.0
: iterationTime / aTiming.mIterationDuration;
}
bool thisIterationReverse = false;
switch (aTiming.mDirection) {
case NS_STYLE_ANIMATION_DIRECTION_NORMAL:
thisIterationReverse = false;
break;
case NS_STYLE_ANIMATION_DIRECTION_REVERSE:
thisIterationReverse = true;
break;
case NS_STYLE_ANIMATION_DIRECTION_ALTERNATE:
thisIterationReverse = (result.mCurrentIteration & 1) == 1;
break;
case NS_STYLE_ANIMATION_DIRECTION_ALTERNATE_REVERSE:
thisIterationReverse = (result.mCurrentIteration & 1) == 0;
break;
}
if (thisIterationReverse) {
result.mTimeFraction = 1.0 - result.mTimeFraction;
}
return result;
}
