mirror of
https://github.com/mozilla/gecko-dev.git
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242708cf72
--HG-- extra : rebase_source : 488e401ff87e31a2074c4108c4df0572d9536667
352 lines
12 KiB
C++
352 lines
12 KiB
C++
/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/dom/Animation.h"
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#include "mozilla/dom/AnimationBinding.h"
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#include "mozilla/dom/AnimationEffect.h"
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#include "mozilla/FloatingPoint.h"
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#include "AnimationCommon.h"
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#include "nsCSSPropertySet.h"
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namespace mozilla {
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void
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ComputedTimingFunction::Init(const nsTimingFunction &aFunction)
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{
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mType = aFunction.mType;
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if (mType == nsTimingFunction::Function) {
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mTimingFunction.Init(aFunction.mFunc.mX1, aFunction.mFunc.mY1,
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aFunction.mFunc.mX2, aFunction.mFunc.mY2);
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} else {
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mSteps = aFunction.mSteps;
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}
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}
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static inline double
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StepEnd(uint32_t aSteps, double aPortion)
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{
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MOZ_ASSERT(0.0 <= aPortion && aPortion <= 1.0, "out of range");
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uint32_t step = uint32_t(aPortion * aSteps); // floor
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return double(step) / double(aSteps);
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}
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double
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ComputedTimingFunction::GetValue(double aPortion) const
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{
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switch (mType) {
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case nsTimingFunction::Function:
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return mTimingFunction.GetSplineValue(aPortion);
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case nsTimingFunction::StepStart:
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// There are diagrams in the spec that seem to suggest this check
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// and the bounds point should not be symmetric with StepEnd, but
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// should actually step up at rather than immediately after the
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// fraction points. However, we rely on rounding negative values
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// up to zero, so we can't do that. And it's not clear the spec
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// really meant it.
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return 1.0 - StepEnd(mSteps, 1.0 - aPortion);
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default:
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MOZ_ASSERT(false, "bad type");
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// fall through
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case nsTimingFunction::StepEnd:
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return StepEnd(mSteps, aPortion);
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}
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}
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// In the Web Animations model, the time fraction can be outside the range
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// [0.0, 1.0] but it shouldn't be Infinity.
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const double ComputedTiming::kNullTimeFraction = PositiveInfinity<double>();
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namespace dom {
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NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(Animation, mDocument, mTarget)
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NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(Animation, AddRef)
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NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(Animation, Release)
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JSObject*
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Animation::WrapObject(JSContext* aCx)
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{
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return AnimationBinding::Wrap(aCx, this);
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}
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already_AddRefed<AnimationEffect>
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Animation::GetEffect()
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{
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nsRefPtr<AnimationEffect> effect = new AnimationEffect(this);
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return effect.forget();
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}
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void
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Animation::SetParentTime(Nullable<TimeDuration> aParentTime)
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{
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mParentTime = aParentTime;
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}
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ComputedTiming
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Animation::GetComputedTimingAt(const Nullable<TimeDuration>& aLocalTime,
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const AnimationTiming& aTiming)
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{
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const TimeDuration zeroDuration;
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// Currently we expect negative durations to be picked up during CSS
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// parsing but when we start receiving timing parameters from other sources
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// we will need to clamp negative durations here.
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// For now, if we're hitting this it probably means we're overflowing
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// integer arithmetic in mozilla::TimeStamp.
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MOZ_ASSERT(aTiming.mIterationDuration >= zeroDuration,
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"Expecting iteration duration >= 0");
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// Always return the same object to benefit from return-value optimization.
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ComputedTiming result;
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result.mActiveDuration = ActiveDuration(aTiming);
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// The default constructor for ComputedTiming sets all other members to
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// values consistent with an animation that has not been sampled.
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if (aLocalTime.IsNull()) {
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return result;
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}
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const TimeDuration& localTime = aLocalTime.Value();
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// When we finish exactly at the end of an iteration we need to report
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// the end of the final iteration and not the start of the next iteration
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// so we set up a flag for that case.
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bool isEndOfFinalIteration = false;
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// Get the normalized time within the active interval.
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StickyTimeDuration activeTime;
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if (localTime >= aTiming.mDelay + result.mActiveDuration) {
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result.mPhase = ComputedTiming::AnimationPhase_After;
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if (!aTiming.FillsForwards()) {
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// The animation isn't active or filling at this time.
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result.mTimeFraction = ComputedTiming::kNullTimeFraction;
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return result;
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}
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activeTime = result.mActiveDuration;
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// Note that infinity == floor(infinity) so this will also be true when we
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// have finished an infinitely repeating animation of zero duration.
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isEndOfFinalIteration =
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aTiming.mIterationCount != 0.0 &&
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aTiming.mIterationCount == floor(aTiming.mIterationCount);
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} else if (localTime < aTiming.mDelay) {
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result.mPhase = ComputedTiming::AnimationPhase_Before;
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if (!aTiming.FillsBackwards()) {
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// The animation isn't active or filling at this time.
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result.mTimeFraction = ComputedTiming::kNullTimeFraction;
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return result;
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}
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// activeTime is zero
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} else {
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MOZ_ASSERT(result.mActiveDuration != zeroDuration,
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"How can we be in the middle of a zero-duration interval?");
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result.mPhase = ComputedTiming::AnimationPhase_Active;
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activeTime = localTime - aTiming.mDelay;
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}
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// Get the position within the current iteration.
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StickyTimeDuration iterationTime;
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if (aTiming.mIterationDuration != zeroDuration) {
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iterationTime = isEndOfFinalIteration
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? StickyTimeDuration(aTiming.mIterationDuration)
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: activeTime % aTiming.mIterationDuration;
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} /* else, iterationTime is zero */
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// Determine the 0-based index of the current iteration.
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if (isEndOfFinalIteration) {
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result.mCurrentIteration =
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aTiming.mIterationCount == NS_IEEEPositiveInfinity()
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? UINT64_MAX // FIXME: When we return this via the API we'll need
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// to make sure it ends up being infinity.
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: static_cast<uint64_t>(aTiming.mIterationCount) - 1;
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} else if (activeTime == zeroDuration) {
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// If the active time is zero we're either in the first iteration
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// (including filling backwards) or we have finished an animation with an
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// iteration duration of zero that is filling forwards (but we're not at
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// the exact end of an iteration since we deal with that above).
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result.mCurrentIteration =
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result.mPhase == ComputedTiming::AnimationPhase_After
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? static_cast<uint64_t>(aTiming.mIterationCount) // floor
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: 0;
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} else {
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result.mCurrentIteration =
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static_cast<uint64_t>(activeTime / aTiming.mIterationDuration); // floor
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}
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// Normalize the iteration time into a fraction of the iteration duration.
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if (result.mPhase == ComputedTiming::AnimationPhase_Before) {
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result.mTimeFraction = 0.0;
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} else if (result.mPhase == ComputedTiming::AnimationPhase_After) {
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result.mTimeFraction = isEndOfFinalIteration
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? 1.0
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: fmod(aTiming.mIterationCount, 1.0f);
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} else {
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// We are in the active phase so the iteration duration can't be zero.
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MOZ_ASSERT(aTiming.mIterationDuration != zeroDuration,
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"In the active phase of a zero-duration animation?");
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result.mTimeFraction =
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aTiming.mIterationDuration == TimeDuration::Forever()
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? 0.0
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: iterationTime / aTiming.mIterationDuration;
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}
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bool thisIterationReverse = false;
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switch (aTiming.mDirection) {
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case NS_STYLE_ANIMATION_DIRECTION_NORMAL:
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thisIterationReverse = false;
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break;
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case NS_STYLE_ANIMATION_DIRECTION_REVERSE:
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thisIterationReverse = true;
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break;
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case NS_STYLE_ANIMATION_DIRECTION_ALTERNATE:
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thisIterationReverse = (result.mCurrentIteration & 1) == 1;
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break;
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case NS_STYLE_ANIMATION_DIRECTION_ALTERNATE_REVERSE:
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thisIterationReverse = (result.mCurrentIteration & 1) == 0;
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break;
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}
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if (thisIterationReverse) {
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result.mTimeFraction = 1.0 - result.mTimeFraction;
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}
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return result;
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}
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StickyTimeDuration
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Animation::ActiveDuration(const AnimationTiming& aTiming)
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{
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if (aTiming.mIterationCount == mozilla::PositiveInfinity<float>()) {
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// An animation that repeats forever has an infinite active duration
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// unless its iteration duration is zero, in which case it has a zero
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// active duration.
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const StickyTimeDuration zeroDuration;
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return aTiming.mIterationDuration == zeroDuration
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? zeroDuration
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: StickyTimeDuration::Forever();
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}
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return StickyTimeDuration(
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aTiming.mIterationDuration.MultDouble(aTiming.mIterationCount));
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}
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bool
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Animation::IsCurrent() const
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{
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if (IsFinishedTransition()) {
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return false;
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}
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ComputedTiming computedTiming = GetComputedTiming();
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return computedTiming.mPhase == ComputedTiming::AnimationPhase_Before ||
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computedTiming.mPhase == ComputedTiming::AnimationPhase_Active;
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}
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bool
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Animation::IsInEffect() const
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{
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if (IsFinishedTransition()) {
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return false;
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}
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ComputedTiming computedTiming = GetComputedTiming();
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return computedTiming.mTimeFraction != ComputedTiming::kNullTimeFraction;
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}
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bool
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Animation::HasAnimationOfProperty(nsCSSProperty aProperty) const
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{
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for (size_t propIdx = 0, propEnd = mProperties.Length();
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propIdx != propEnd; ++propIdx) {
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if (aProperty == mProperties[propIdx].mProperty) {
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return true;
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}
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}
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return false;
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}
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void
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Animation::ComposeStyle(nsRefPtr<css::AnimValuesStyleRule>& aStyleRule,
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nsCSSPropertySet& aSetProperties)
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{
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ComputedTiming computedTiming = GetComputedTiming();
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// If the time fraction is null, we don't have fill data for the current
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// time so we shouldn't animate.
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if (computedTiming.mTimeFraction == ComputedTiming::kNullTimeFraction) {
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return;
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}
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MOZ_ASSERT(0.0 <= computedTiming.mTimeFraction &&
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computedTiming.mTimeFraction <= 1.0,
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"timing fraction should be in [0-1]");
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for (size_t propIdx = 0, propEnd = mProperties.Length();
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propIdx != propEnd; ++propIdx)
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{
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const AnimationProperty& prop = mProperties[propIdx];
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MOZ_ASSERT(prop.mSegments[0].mFromKey == 0.0, "incorrect first from key");
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MOZ_ASSERT(prop.mSegments[prop.mSegments.Length() - 1].mToKey == 1.0,
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"incorrect last to key");
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if (aSetProperties.HasProperty(prop.mProperty)) {
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// Animations are composed by AnimationPlayerCollection by iterating
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// from the last animation to first. For animations targetting the
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// same property, the later one wins. So if this property is already set,
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// we should not override it.
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return;
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}
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aSetProperties.AddProperty(prop.mProperty);
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MOZ_ASSERT(prop.mSegments.Length() > 0,
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"property should not be in animations if it has no segments");
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// FIXME: Maybe cache the current segment?
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const AnimationPropertySegment *segment = prop.mSegments.Elements(),
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*segmentEnd = segment + prop.mSegments.Length();
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while (segment->mToKey < computedTiming.mTimeFraction) {
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MOZ_ASSERT(segment->mFromKey < segment->mToKey, "incorrect keys");
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++segment;
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if (segment == segmentEnd) {
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MOZ_ASSERT_UNREACHABLE("incorrect time fraction");
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break; // in order to continue in outer loop (just below)
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}
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MOZ_ASSERT(segment->mFromKey == (segment-1)->mToKey, "incorrect keys");
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}
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if (segment == segmentEnd) {
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continue;
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}
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MOZ_ASSERT(segment->mFromKey < segment->mToKey, "incorrect keys");
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MOZ_ASSERT(segment >= prop.mSegments.Elements() &&
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size_t(segment - prop.mSegments.Elements()) <
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prop.mSegments.Length(),
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"out of array bounds");
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if (!aStyleRule) {
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// Allocate the style rule now that we know we have animation data.
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aStyleRule = new css::AnimValuesStyleRule();
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}
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double positionInSegment =
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(computedTiming.mTimeFraction - segment->mFromKey) /
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(segment->mToKey - segment->mFromKey);
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double valuePosition =
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segment->mTimingFunction.GetValue(positionInSegment);
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StyleAnimationValue *val = aStyleRule->AddEmptyValue(prop.mProperty);
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#ifdef DEBUG
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bool result =
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#endif
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StyleAnimationValue::Interpolate(prop.mProperty,
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segment->mFromValue,
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segment->mToValue,
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valuePosition, *val);
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MOZ_ASSERT(result, "interpolate must succeed now");
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}
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}
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} // namespace dom
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} // namespace mozilla
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