diff options
| -rw-r--r-- | src/evdev-mt-touchpad.c | 20 |
1 files changed, 5 insertions, 15 deletions
diff --git a/src/evdev-mt-touchpad.c b/src/evdev-mt-touchpad.c index d72cb191..7b8514cb 100644 --- a/src/evdev-mt-touchpad.c +++ b/src/evdev-mt-touchpad.c @@ -262,29 +262,19 @@ tp_end_sequence(struct tp_dispatch *tp, struct tp_touch *t, uint64_t time) tp_end_touch(tp, t, time); } -static double -tp_estimate_delta(int x0, int x1, int x2, int x3) -{ - return (x0 + x1 - x2 - x3) / 4.0; -} - struct normalized_coords tp_get_delta(struct tp_touch *t) { struct device_float_coords delta; const struct normalized_coords zero = { 0.0, 0.0 }; - if (t->history.count < TOUCHPAD_MIN_SAMPLES) + if (t->history.count <= 1) return zero; - delta.x = tp_estimate_delta(tp_motion_history_offset(t, 0)->x, - tp_motion_history_offset(t, 1)->x, - tp_motion_history_offset(t, 2)->x, - tp_motion_history_offset(t, 3)->x); - delta.y = tp_estimate_delta(tp_motion_history_offset(t, 0)->y, - tp_motion_history_offset(t, 1)->y, - tp_motion_history_offset(t, 2)->y, - tp_motion_history_offset(t, 3)->y); + delta.x = tp_motion_history_offset(t, 0)->x - + tp_motion_history_offset(t, 1)->x; + delta.y = tp_motion_history_offset(t, 0)->y - + tp_motion_history_offset(t, 1)->y; return tp_normalize_delta(t->tp, delta); } |