double Animation::calculateTimeToEffectChange(bool forwards, double localTime, double timeToNextIteration) const
{
const double start = startTimeInternal() + specifiedTiming().startDelay;
const double end = start + activeDurationInternal();
switch (phase()) {
case PhaseBefore:
ASSERT(start >= localTime);
return forwards
? start - localTime
: std::numeric_limits<double>::infinity();
case PhaseActive:
return 0;
case PhaseAfter:
ASSERT(localTime >= end);
// If this Animation is still in effect then it will need to update
// when its parent goes out of effect. We have no way of knowing when
// that will be, however, so the parent will need to supply it.
return forwards
? std::numeric_limits<double>::infinity()
: localTime - end;
default:
ASSERT_NOT_REACHED();
return std::numeric_limits<double>::infinity();
}
}
bool AnimationPlayer::maybeStartAnimationOnCompositor()
{
if (!canStartAnimationOnCompositor())
return false;
double startTime = timeline()->zeroTime() + startTimeInternal();
double timeOffset = 0;
if (std::isnan(startTime)) {
timeOffset = currentTimeInternal();
}
return toAnimation(m_content.get())->maybeStartAnimationOnCompositor(startTime, timeOffset);
}
bool AnimationPlayer::maybeStartAnimationOnCompositor()
{
if (!canStartAnimationOnCompositor())
return false;
bool reversed = m_playbackRate < 0;
double startTime = timeline()->zeroTime() + startTimeInternal();
if (reversed) {
startTime -= sourceEnd() / fabs(m_playbackRate);
}
double timeOffset = 0;
if (std::isnan(startTime)) {
timeOffset = reversed ? sourceEnd() - currentTimeInternal() : currentTimeInternal();
timeOffset = timeOffset / fabs(m_playbackRate);
}
ASSERT(m_compositorGroup != 0);
return toAnimation(m_content.get())->maybeStartAnimationOnCompositor(m_compositorGroup, startTime, timeOffset, m_playbackRate);
}
double Animation::calculateTimeToEffectChange(bool forwards, double localTime, double timeToNextIteration) const
{
const double start = startTimeInternal() + specifiedTiming().startDelay;
const double end = start + activeDurationInternal();
switch (phase()) {
case PhaseBefore:
ASSERT(start >= localTime);
return forwards
? start - localTime
: std::numeric_limits<double>::infinity();
case PhaseActive:
if (forwards && hasActiveAnimationsOnCompositor()) {
ASSERT(specifiedTiming().playbackRate == 1);
// Need service to apply fill / fire events.
const double timeToEnd = end - localTime;
if (hasEvents()) {
return std::min(timeToEnd, timeToNextIteration);
} else {
return timeToEnd;
}
}
return 0;
case PhaseAfter:
ASSERT(localTime >= end);
// If this Animation is still in effect then it will need to update
// when its parent goes out of effect. We have no way of knowing when
// that will be, however, so the parent will need to supply it.
return forwards
? std::numeric_limits<double>::infinity()
: localTime - end;
default:
ASSERT_NOT_REACHED();
return std::numeric_limits<double>::infinity();
}
}