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gestures: don't handle SWIPE if we transitioned from SWIPE_START

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If we get to SWIPE_START we send out the BEGIN event and transition to
state SWIPE. We must not process that state immediately to avoid sending
out a spurious UPDATE event when nothing has changed.

Same for the PINCH_START/PINCH and SCROLL_START/SCROLL states.

This also fixes a crasher where we end up with NaN in the custom
acceleration function because passing the same timestamp in twice causes
a division by zero (delta time is zero).

Closes #1053

Part-of: <https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/1088>
This commit is contained in:
Peter Hutterer 2024-12-05 13:09:43 +10:00 • committed by Marge Bot
parent 84225f28b6
commit c3aa00ef90
1 changed files with 11 additions and 10 deletions
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21
src/evdev-mt-touchpad-gestures.c
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@ -1488,18 +1488,13 @@ tp_gesture_handle_state(struct tp_dispatch *tp, uint64_t time,
if (transitions[idx - 1] != tp->gesture.state)
transitions[idx++] = tp->gesture.state;
}
if (tp->gesture.state == GESTURE_STATE_SCROLL_START) {
tp_gesture_handle_state_scroll_start(tp, time);
if (transitions[idx - 1] != tp->gesture.state)
transitions[idx++] = tp->gesture.state;
}
if (tp->gesture.state == GESTURE_STATE_SCROLL) {
tp_gesture_handle_state_scroll(tp, time);
if (transitions[idx - 1] != tp->gesture.state)
transitions[idx++] = tp->gesture.state;
}
if (tp->gesture.state == GESTURE_STATE_SWIPE_START) {
tp_gesture_handle_state_swipe_start(tp, time);
if (tp->gesture.state == GESTURE_STATE_SCROLL_START) {
tp_gesture_handle_state_scroll_start(tp, time);
if (transitions[idx - 1] != tp->gesture.state)
transitions[idx++] = tp->gesture.state;
}
@ -1508,15 +1503,21 @@ tp_gesture_handle_state(struct tp_dispatch *tp, uint64_t time,
if (transitions[idx - 1] != tp->gesture.state)
transitions[idx++] = tp->gesture.state;
}
if (tp->gesture.state == GESTURE_STATE_PINCH_START) {
tp_gesture_handle_state_pinch_start(tp, time);
if (tp->gesture.state == GESTURE_STATE_SWIPE_START) {
tp_gesture_handle_state_swipe_start(tp, time);
if (transitions[idx - 1] != tp->gesture.state)
transitions[idx++] = tp->gesture.state;
}
if (tp->gesture.state == GESTURE_STATE_PINCH) {
tp_gesture_handle_state_pinch(tp, time);
if (transitions[idx - 1] != tp->gesture.state)
transitions[idx++] = tp->gesture.state;
}
if (tp->gesture.state == GESTURE_STATE_PINCH_START) {
tp_gesture_handle_state_pinch_start(tp, time);
if (transitions[idx - 1] != tp->gesture.state)
transitions[idx++] = tp->gesture.state;
}
if (oldstate != tp->gesture.state) {
char buf[1024] = {0};
size_t remaining = sizeof(buf);