frameclock_apple: convert CA timestamps relatively - #45
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waywardmonkeys merged 1 commit intoJun 18, 2026
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Project `CADisplayLink.timestamp` and `CADisplayLink.targetTimestamp` into the `HostTime` domain using their delta from `CACurrentMediaTime()` and a same-callback `mach_time::now()` sample. This keeps `FrameTick.now`, `FrameTick.predicted_present`, and `FrameTick.prev_actual_present` in one Mach host-time domain without assuming Core Animation media seconds and Mach absolute ticks share an epoch. Add regression coverage for present, future, past, saturating, non-finite, and non-nanosecond timebase conversion cases.
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Project
CADisplayLink.timestampandCADisplayLink.targetTimestampinto theHostTimedomain using their delta fromCACurrentMediaTime()and a same-callbackmach_time::now()sample.This keeps
FrameTick.now,FrameTick.predicted_present, andFrameTick.prev_actual_presentin one Mach host-time domain without assuming Core Animation media seconds and Mach absolute ticks share an epoch.Add regression coverage for present, future, past, saturating, non-finite, and non-nanosecond timebase conversion cases.