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Bug 1339690 - Part 5: Merge two DistributeRange functions. r=birtles

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MozReview-Commit-ID: 3QT09Qmy3Lg

--HG--
extra : rebase_source : 5590d5df20af5c7e0cc63fef97e203cdda202967
This commit is contained in:
Boris Chiou 2017-06-15 10:54:36 +08:00
parent 02bf8062fe
commit d3495b8861
1 changed files with 13 additions and 37 deletions
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50
dom/animation/KeyframeUtils.cpp
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@ -409,7 +409,7 @@ RequiresAdditiveAnimation(const nsTArray<Keyframe>& aKeyframes,
nsIDocument* aDocument);
static void
DistributeRange(const Range<Keyframe>& aSpacingRange);
DistributeRange(const Range<Keyframe>& aRange);
// ------------------------------------------------------------------
//
@ -1517,48 +1517,24 @@ RequiresAdditiveAnimation(const nsTArray<Keyframe>& aKeyframes,
}
/**
* Evenly distribute the computed offsets in (A, B).
* We pass the range keyframes in [A, B] and use A, B to calculate distributing
* computed offsets in (A, B). The second range, aRangeToAdjust, is passed, so
* we can know which keyframe we want to apply to. aRangeToAdjust should be in
* the range of aSpacingRange.
* Distribute the offsets of all keyframes in between the endpoints of the
* given range.
*
* @param aSpacingRange The sequence of keyframes between whose endpoints we
* should apply distribute offsets.
* @param aRangeToAdjust The range of keyframes we want to apply to.
* @param aRange The sequence of keyframes between whose endpoints we should
* distribute offsets.
*/
static void
DistributeRange(const Range<Keyframe>& aSpacingRange,
const Range<Keyframe>& aRangeToAdjust)
DistributeRange(const Range<Keyframe>& aRange)
{
MOZ_ASSERT(aRangeToAdjust.begin() >= aSpacingRange.begin() &&
aRangeToAdjust.end() <= aSpacingRange.end(),
"Out of range");
const size_t n = aSpacingRange.length() - 1;
const double startOffset = aSpacingRange[0].mComputedOffset;
const double diffOffset = aSpacingRange[n].mComputedOffset - startOffset;
for (auto iter = aRangeToAdjust.begin();
iter != aRangeToAdjust.end();
++iter) {
size_t index = iter - aSpacingRange.begin();
const Range<Keyframe> rangeToAdjust = Range<Keyframe>(aRange.begin() + 1,
aRange.end() - 1);
const size_t n = aRange.length() - 1;
const double startOffset = aRange[0].mComputedOffset;
const double diffOffset = aRange[n].mComputedOffset - startOffset;
for (auto iter = rangeToAdjust.begin(); iter != rangeToAdjust.end(); ++iter) {
size_t index = iter - aRange.begin();
iter->mComputedOffset = startOffset + double(index) / n * diffOffset;
}
}
/**
* Overload of DistributeRange to apply distribute spacing to all keyframes in
* between the endpoints of the given range.
*
* @param aSpacingRange The sequence of keyframes between whose endpoints we
* should apply distribute spacing.
*/
static void
DistributeRange(const Range<Keyframe>& aSpacingRange)
{
// We don't need to apply distribute spacing to keyframe A and keyframe B.
DistributeRange(aSpacingRange,
Range<Keyframe>(aSpacingRange.begin() + 1,
aSpacingRange.end() - 1));
}
} // namespace mozilla