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touchpad: reduce the tap movement threshold to 1.3mm

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When a finger moves less than the movement threshold, motion is filtered until
the timeout is hit. If the threshold is too high the responsiveness of the
pointer suffers.

Event analysis from several users showed that 95% of the touches move less
than 1.3mm long. Reducing the threshold should have almost no impact on most
tapping users but improves the reaction time of the pointer for normal
movements.

For a more details see:
http://who-t.blogspot.com/2016/12/libinput-touchpad-tap-analysis.html

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 2016-12-02 11:45:44 +10:00
parent d0ba1e2b38
commit e80873ca6f
1 changed files with 1 additions and 1 deletions
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2
src/evdev-mt-touchpad-tap.c
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@ -36,7 +36,7 @@
#define DEFAULT_TAP_INITIAL_TIMEOUT_PERIOD ms2us(100)
#define DEFAULT_TAP_TIMEOUT_PERIOD ms2us(180)
#define DEFAULT_DRAG_TIMEOUT_PERIOD ms2us(300)
#define DEFAULT_TAP_MOVE_THRESHOLD TP_MM_TO_DPI_NORMALIZED(3)
#define DEFAULT_TAP_MOVE_THRESHOLD TP_MM_TO_DPI_NORMALIZED(1.3)
enum tap_event {
TAP_EVENT_TOUCH = 12,