static void CreatePropertyValue(nsCSSPropertyID aProperty, float aOffset, const Maybe<ComputedTimingFunction>& aTimingFunction, const StyleAnimationValue& aValue, AnimationPropertyValueDetails& aResult) { aResult.mOffset = aOffset; nsString stringValue; DebugOnly<bool> uncomputeResult = StyleAnimationValue::UncomputeValue(aProperty, aValue, stringValue); MOZ_ASSERT(uncomputeResult, "failed to uncompute value"); aResult.mValue = stringValue; if (aTimingFunction) { aResult.mEasing.Construct(); aTimingFunction->AppendToString(aResult.mEasing.Value()); } else { aResult.mEasing.Construct(NS_LITERAL_STRING("linear")); } aResult.mComposite = CompositeOperation::Replace; }