Multitouch in X - Pointer emulation question ?
peter.hutterer at who-t.net
Tue Oct 22 16:20:29 PDT 2013
On Thu, Oct 17, 2013 at 11:55:24AM +0200, Patrice B wrote:
> I'm working on a kernel evdev driver that provides MT events. This device
> is correctly detected by evdev Xorg driver and I'm able to see MT events
> using "xinput text-xi2". I wrote also a small program based on xi2 which
> makes two rectangles follow my fingers on the screen and it works.
> What is a bit "fuzzy" for me is how programs that don't handle XI2 should
> behave with MT driver. I read
> and I thought common application such as xev should received emulated
> classic X events. They don't receive anything in my case. Should they ?
> Does something about this emulation needs to be done in kernel driver ?
the server decides which client gets MT and which one gets an emulated
pointer on a per-client basis. your test program that registers for XI 2.2
won't see pointer emulation, but xev still should. Last I checked, this
either way, there's nothing you need to do in the kernel driver. if you
speak the MT protocol B, the rest should be handled automatically.
More information about the xorg