timescale of [glib.global.getMonotonicTime], or 0 if no presentation time is available. See [gdk.frame_timings.FrameTimings.getComplete]
FrameTimings.getPresentationTime
long getPresentationTime()Reurns the presentation time. This is the time at which the frame became visible to the user.
Returns
the time the frame was displayed to the user, in the