If the trackpoint gives us deltas with less than 10ms intervals, something is
wrong. Could be bad hardware, a glitch in the matrix or a discontinuity in
the otherwise appropriately named time-space continuum. Usually it's the
first.
Let's always set up trackpoint delta smoothening for 10ms to improve the
pointer speed calculation and avoid jerky behaviors. i.e. if a trackpoint
delta comes in below 10ms, pretend it came in with a 10ms interval for
calculating the speed.
Fixes https://gitlab.freedesktop.org/libinput/libinput/issues/104
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
create_pointer_accelerator_filter_trackpoint(double multiplier)
{
struct trackpoint_accelerator *filter;
+ struct pointer_delta_smoothener *smoothener;
assert(multiplier > 0.0);
filter->base.interface = &accelerator_interface_trackpoint;
+ smoothener = zalloc(sizeof(*smoothener));
+ smoothener->threshold = ms2us(10);
+ smoothener->value = ms2us(10);
+ filter->trackers.smoothener = smoothener;
+
return &filter->base;
}