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Bug 1171156. Add logging to OS X vsync timestamps. r=mstange

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This commit is contained in:
Mason Chang 2015-06-05 15:58:40 -07:00
parent eb0d3f4973
commit fd14dd1542
1 changed files with 6 additions and 1 deletions
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7
gfx/thebes/gfxPlatformMac.cpp
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@ -577,7 +577,12 @@ static CVReturn VsyncCallback(CVDisplayLinkRef aDisplayLink,
mozilla::TimeStamp previousVsync = display->mPreviousTimestamp;
display->mPreviousTimestamp = nextVsync;
mozilla::TimeStamp now = TimeStamp::Now();
MOZ_ASSERT(nextVsync > previousVsync);
if (nextVsync <= previousVsync) {
TimeDuration next = nextVsync - now;
TimeDuration prev = now - previousVsync;
printf_stderr("Next from now: %f, prev from now: %f\n", next.ToMilliseconds(), prev.ToMilliseconds());
MOZ_ASSERT(false, "Next vsync less than previous vsync\n");
}
// Bug 1158321 - The VsyncCallback can sometimes execute before the reported
// vsync time. In those cases, normalize the timestamp to Now() as sending