On Nov 2, 2013 11:40 PM, "Axel Davy" <<a href="mailto:axel.davy@ens.fr">axel.davy@ens.fr</a>> wrote: > > Here is another proposition to extend the protocol > to allow video players to control better the time at > which frames hit the screen. > > Contrary to the original proposition: > <a href="http://lists.freedesktop.org/archives/wayland-devel/2013-October/011496.html">http://lists.freedesktop.org/archives/wayland-devel/2013-October/011496.html</a> > > I do not separate the new request in another interface. > > The first request: presentation_time is only an indication to the compositor, > and the hit request is a similar feedback to the frame request, but the > notification is when the frame hit the screen. That's why I don't think it > should be difficult for some compositors to implement it, and don't feel the > need to separate it in another interface. > > The requests were designed to help implement the Present extension for > XWayland. However the Present extension use Microseconds times, instead > of Milliseconds. > > Any feedback is appreciated. > > I'm not English native, so if you feel some sentence are incorrect, > please help me to correct them. > Just one question. Which clock is being used. Ideally a monotony one, or even better, a configurable one. We would normally not want these timestamps affected by the user changing the system time. James