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filter: always init a delta smoothener for 10/10ms on trackpoints

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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>
This commit is contained in:
Peter Hutterer 2018-08-06 15:24:04 +10:00
parent 82f3e77fb2
commit 77f9a47996
1 changed files with 6 additions and 0 deletions
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6
src/filter-trackpoint.c
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@ -185,6 +185,7 @@ struct motion_filter *
create_pointer_accelerator_filter_trackpoint(double multiplier)
{
struct trackpoint_accelerator *filter;
struct pointer_delta_smoothener *smoothener;
assert(multiplier > 0.0);
@ -210,5 +211,10 @@ create_pointer_accelerator_filter_trackpoint(double multiplier)
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;
}