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Fix coasting for negative ScrollDelta

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Fix the coasting direction for when VertScrollDelta or HorizScrollDelta is
negative.

Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=49966

Regression introduced in 0de4445ff8

Signed-off-by: Chun Yang <Chuck.Yang@gmail.com>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
(cherry picked from commit 53557a5cab)
This commit is contained in:
Chun Yang
2012-05-15 14:51:42 -05:00
committed by Peter Hutterer
parent 23e87b57bb
commit 67a02d676c
1 changed files with 2 additions and 2 deletions
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4
src/synaptics.c
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@@ -2740,7 +2740,7 @@ HandleScrolling(SynapticsPrivate * priv, struct SynapticsHwState *hw,
double dtime = (hw->millis - priv->scroll.last_millis) / 1000.0;
double ddy = para->coasting_friction * dtime;
priv->scroll.delta_y += priv->scroll.coast_speed_y * dtime * para->scroll_dist_vert;
priv->scroll.delta_y += priv->scroll.coast_speed_y * dtime * abs(para->scroll_dist_vert);
delay = MIN(delay, POLL_MS);
if (abs(priv->scroll.coast_speed_y) < ddy) {
priv->scroll.coast_speed_y = 0;
@@ -2755,7 +2755,7 @@ HandleScrolling(SynapticsPrivate * priv, struct SynapticsHwState *hw,
if (priv->scroll.coast_speed_x) {
double dtime = (hw->millis - priv->scroll.last_millis) / 1000.0;
double ddx = para->coasting_friction * dtime;
priv->scroll.delta_x += priv->scroll.coast_speed_x * dtime * para->scroll_dist_vert;
priv->scroll.delta_x += priv->scroll.coast_speed_x * dtime * abs(para->scroll_dist_horiz);
delay = MIN(delay, POLL_MS);
if (abs(priv->scroll.coast_speed_x) < ddx) {
priv->scroll.coast_speed_x = 0;