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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
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      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
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     10  *     * Redistributions in binary form must reproduce the above
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     12  * in the documentation and/or other materials provided with the
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     16  * this software without specific prior written permission.
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     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "core/animation/TimedItem.h"
     33 
     34 #include "core/animation/Player.h"
     35 #include "core/animation/TimedItemCalculations.h"
     36 
     37 namespace WebCore {
     38 
     39 TimedItem::TimedItem(const Timing& timing, PassOwnPtr<EventDelegate> eventDelegate)
     40     : m_parent(0)
     41     , m_startTime(0)
     42     , m_player(0)
     43     , m_specified(timing)
     44     , m_eventDelegate(eventDelegate)
     45     , m_calculated()
     46     , m_isFirstSample(true)
     47     , m_needsUpdate(true)
     48     , m_lastUpdateTime(nullValue())
     49 {
     50     m_specified.assertValid();
     51 }
     52 
     53 bool TimedItem::updateInheritedTime(double inheritedTime) const
     54 {
     55     bool needsUpdate = m_needsUpdate || (m_lastUpdateTime != inheritedTime && !(isNull(m_lastUpdateTime) && isNull(inheritedTime)));
     56     m_needsUpdate = false;
     57     m_lastUpdateTime = inheritedTime;
     58 
     59     const double previousIteration = m_calculated.currentIteration;
     60     const Phase previousPhase = m_calculated.phase;
     61 
     62     const double localTime = inheritedTime - m_startTime;
     63     double timeToNextIteration = std::numeric_limits<double>::infinity();
     64     if (needsUpdate) {
     65         const double iterationDuration = m_specified.hasIterationDuration
     66             ? m_specified.iterationDuration
     67             : intrinsicIterationDuration();
     68         ASSERT(iterationDuration >= 0);
     69 
     70         // When iterationDuration = 0 and iterationCount = infinity, or vice-
     71         // versa, repeatedDuration should be 0, not NaN as operator*() would give.
     72         // FIXME: The spec is unclear about this.
     73         const double repeatedDuration = multiplyZeroAlwaysGivesZero(iterationDuration, m_specified.iterationCount);
     74         ASSERT(repeatedDuration >= 0);
     75         const double activeDuration = m_specified.playbackRate
     76             ? repeatedDuration / abs(m_specified.playbackRate)
     77             : std::numeric_limits<double>::infinity();
     78         ASSERT(activeDuration >= 0);
     79 
     80         const Phase currentPhase = calculatePhase(activeDuration, localTime, m_specified);
     81         // FIXME: parentPhase depends on groups being implemented.
     82         const TimedItem::Phase parentPhase = TimedItem::PhaseActive;
     83         const double activeTime = calculateActiveTime(activeDuration, localTime, parentPhase, currentPhase, m_specified);
     84 
     85         double currentIteration;
     86         double timeFraction;
     87         if (iterationDuration) {
     88             const double startOffset = multiplyZeroAlwaysGivesZero(m_specified.iterationStart, iterationDuration);
     89             ASSERT(startOffset >= 0);
     90             const double scaledActiveTime = calculateScaledActiveTime(activeDuration, activeTime, startOffset, m_specified);
     91             const double iterationTime = calculateIterationTime(iterationDuration, repeatedDuration, scaledActiveTime, startOffset, m_specified);
     92 
     93             currentIteration = calculateCurrentIteration(iterationDuration, iterationTime, scaledActiveTime, m_specified);
     94             timeFraction = calculateTransformedTime(currentIteration, iterationDuration, iterationTime, m_specified) / iterationDuration;
     95 
     96             if (!isNull(iterationTime)) {
     97                 timeToNextIteration = (iterationDuration - iterationTime) / abs(m_specified.playbackRate);
     98                 if (activeDuration - activeTime < timeToNextIteration)
     99                     timeToNextIteration = std::numeric_limits<double>::infinity();
    100             }
    101         } else {
    102             const double localIterationDuration = 1;
    103             const double localRepeatedDuration = localIterationDuration * m_specified.iterationCount;
    104             ASSERT(localRepeatedDuration >= 0);
    105             const double localActiveDuration = m_specified.playbackRate ? localRepeatedDuration / abs(m_specified.playbackRate) : std::numeric_limits<double>::infinity();
    106             ASSERT(localActiveDuration >= 0);
    107             const double localLocalTime = localTime < m_specified.startDelay ? localTime : localActiveDuration + m_specified.startDelay;
    108             const TimedItem::Phase localCurrentPhase = calculatePhase(localActiveDuration, localLocalTime, m_specified);
    109             const double localActiveTime = calculateActiveTime(localActiveDuration, localLocalTime, parentPhase, localCurrentPhase, m_specified);
    110             const double startOffset = m_specified.iterationStart * localIterationDuration;
    111             ASSERT(startOffset >= 0);
    112             const double scaledActiveTime = calculateScaledActiveTime(localActiveDuration, localActiveTime, startOffset, m_specified);
    113             const double iterationTime = calculateIterationTime(localIterationDuration, localRepeatedDuration, scaledActiveTime, startOffset, m_specified);
    114 
    115             currentIteration = calculateCurrentIteration(localIterationDuration, iterationTime, scaledActiveTime, m_specified);
    116             timeFraction = calculateTransformedTime(currentIteration, localIterationDuration, iterationTime, m_specified);
    117         }
    118 
    119         m_calculated.currentIteration = currentIteration;
    120         m_calculated.activeDuration = activeDuration;
    121         m_calculated.timeFraction = timeFraction;
    122 
    123         m_calculated.phase = currentPhase;
    124         m_calculated.isInEffect = !isNull(activeTime);
    125         m_calculated.isInPlay = phase() == PhaseActive && (!m_parent || m_parent->isInPlay());
    126         m_calculated.isCurrent = phase() == PhaseBefore || isInPlay() || (m_parent && m_parent->isCurrent());
    127     }
    128 
    129     // Test for events even if timing didn't need an update as the player may have gained a start time.
    130     // FIXME: Refactor so that we can ASSERT(m_player) here, this is currently required to be nullable for testing.
    131     if (!m_player || m_player->hasStartTime()) {
    132         // This logic is specific to CSS animation events and assumes that all
    133         // animations start after the DocumentTimeline has started.
    134         if (m_eventDelegate && (m_isFirstSample || previousPhase != phase() || (phase() == PhaseActive && previousIteration != m_calculated.currentIteration)))
    135             m_eventDelegate->onEventCondition(this, m_isFirstSample, previousPhase, previousIteration);
    136         m_isFirstSample = false;
    137     }
    138 
    139     bool didTriggerStyleRecalc = false;
    140     if (needsUpdate)  {
    141         // FIXME: This probably shouldn't be recursive.
    142         didTriggerStyleRecalc = updateChildrenAndEffects();
    143         m_calculated.timeToEffectChange = calculateTimeToEffectChange(localTime, timeToNextIteration);
    144     }
    145     return didTriggerStyleRecalc;
    146 }
    147 
    148 } // namespace WebCore
    149