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filter: cap trackpoint scale factor at 1.0

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Otherwise we scale up lower-resolution trackpoints' movements, resulting in a
jumpy cursor.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
(cherry picked from commit 483123d490)
This commit is contained in:
Peter Hutterer 2018-06-04 13:36:08 +10:00
parent 156e53dc12
commit 168aad057d
1 changed files with 8 additions and 1 deletions
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9
src/filter-trackpoint.c
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@ -299,10 +299,17 @@ create_pointer_accelerator_filter_trackpoint(int max_hw_delta)
return NULL;
filter->history_size = ARRAY_LENGTH(filter->history);
filter->scale_factor = 1.0 * TRACKPOINT_DEFAULT_RANGE / max_hw_delta;
filter->max_accel = TRACKPOINT_DEFAULT_MAX_ACCEL;
filter->max_delta = TRACKPOINT_DEFAULT_MAX_DELTA;
filter->scale_factor = 1.0 * TRACKPOINT_DEFAULT_RANGE / max_hw_delta;
/* Crop to a maximum 1.0 for the scale factor, otherwise we scale up
* events from low-res trackpoints when really we should just take
* those as-is.
*/
filter->scale_factor = min(1.0, filter->scale_factor);
filter->base.interface = &accelerator_interface_trackpoint;
return &filter->base;