fdo-mirrors/libinput
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/libinput/libinput.git synced 2026-01-19 21:10:27 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions

touchpad: don't feed 0/0 deltas into the accel filters

Browse source 
The resolution-based scaling may result in deltas of 0. The accel code doesn't
handle 0 deltas too well. 0/0 deltas can't happen for EV_REL devices, so the
code just isn't designed for it.

Most notably, events with delta 0/0 have no direction. That messes up the
history-based velocity calculation which stops whenever the current vector's
direction changes from the one in the trackers.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Peter Hutterer 2014-07-08 13:02:31 +10:00
parent 14ba84cdca
commit 468e628808
1 changed files with 2 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
src/evdev-mt-touchpad.c
View file

@ -63,7 +63,8 @@ tp_filter_motion(struct tp_dispatch *tp,
motion.dx = *dx * tp->accel.x_scale_coeff;
motion.dy = *dy * tp->accel.y_scale_coeff;
filter_dispatch(tp->filter, &motion, tp, time);
if (motion.dx != 0.0 || motion.dy != 0.0)
filter_dispatch(tp->filter, &motion, tp, time);
*dx = motion.dx;
*dy = motion.dy;