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Bug 1251405. Part 1. Fix a significant signed/unsigned mismatch in handling the return value of FrameAnimator::GetSingleLoopTime. r=edwin

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GetSingleLoopTime returns -1 on exceptional cases but we used an unsigned int to hold the return value in AdvanceFrame. So the |loopTime > 0| check would succeed. Fortunately the |delay.ToMilliseconds() > loopTime| check would fail because loopTime was MAX_UNIT32, so we didn't do anything incorrect.

http://hg.mozilla.org/mozilla-central/rev/263980931d1b (bug 890743) changed GetSingleLoopTime from returning 0 (and uint32_t) to -1 (and int32_t) on exceptional cases. But the caller of GetSingleLoopTime wasn't updated.
This commit is contained in:
Timothy Nikkel 2016-03-04 21:54:00 -06:00
parent de1a6b8812
commit ddf84be823
1 changed files with 8 additions and 3 deletions
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11
image/FrameAnimator.cpp
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@ -33,7 +33,7 @@ FrameAnimator::GetSingleLoopTime() const
return -1;
}
uint32_t looptime = 0;
int32_t looptime = 0;
for (uint32_t i = 0; i < mImage->GetNumFrames(); ++i) {
int32_t timeout = GetTimeoutForFrame(i);
if (timeout >= 0) {
@ -180,9 +180,14 @@ FrameAnimator::AdvanceFrame(TimeStamp aTime)
mCurrentAnimationFrameTime = GetCurrentImgFrameEndTime();
// If we can get closer to the current time by a multiple of the image's loop
// time, we should.
uint32_t loopTime = GetSingleLoopTime();
// time, we should. We need to be done decoding in order to know the full loop
// time though!
int32_t loopTime = GetSingleLoopTime();
if (loopTime > 0) {
// We shouldn't be advancing by a whole loop unless we are decoded and know
// what a full loop actually is. GetSingleLoopTime should return -1 so this
// never happens.
MOZ_ASSERT(mDoneDecoding);
TimeDuration delay = aTime - mCurrentAnimationFrameTime;
if (delay.ToMilliseconds() > loopTime) {
// Explicitly use integer division to get the floor of the number of