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touchpad: correct the tap state transitions for a palm on TOUCH_BEGIN

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Where a touch is labelled as palm on TOUCH_BEGIN (edge palms) we would still
feed the touch through the tap state machine. This would trigger the PALM
transition for each state, usually reducing the touch count.

When the touches were later released, the touch count was out of sync,
resulting in an error message. In the case of #488, the trigger was
a single evdev frame with three fingers down, the third of which was an edge
palm:
- touch 1 transitions from IDLE to TOUCH
- touch 2 transitions from TOUCH to TOUCH_2
- touch 3 (the palm) transitioned from TOUCH_2 back to TOUCH

That third transition is invalid, the palm hasn't been seen by the tap state
machine so it should just be ignored.

Fix this by moving making the tap state processing conditional on a touch
state other than TOUCH_BEGIN.

Fixes #488

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Peter Hutterer 2020-05-28 10:58:06 +10:00
parent 6e9477a86d
commit fc7b8d7948
2 changed files with 36 additions and 1 deletions
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2
src/evdev-mt-touchpad-tap.c
View file

@ -894,10 +894,10 @@ tp_tap_handle_state(struct tp_dispatch *tp, uint64_t time)
if (t->palm.state != PALM_NONE) {
assert(!t->tap.is_palm);
tp_tap_handle_event(tp, t, TAP_EVENT_PALM, time);
t->tap.is_palm = true;
t->tap.state = TAP_TOUCH_STATE_DEAD;
if (t->state != TOUCH_BEGIN) {
tp_tap_handle_event(tp, t, TAP_EVENT_PALM, time);
assert(tp->tap.nfingers_down > 0);
tp->tap.nfingers_down--;
}

35
test/test-touchpad-tap.c
View file

@ -3654,6 +3654,40 @@ START_TEST(touchpad_tap_palm_dwt_tap)
}
END_TEST
START_TEST(touchpad_tap_palm_3fg_start)
{
struct litest_device *dev = litest_current_device();
struct libinput *li = dev->libinput;
if (litest_slot_count(dev) < 3 ||
!litest_has_palm_detect_size(dev))
return;
litest_enable_tap(dev->libinput_device);
litest_drain_events(li);
litest_push_event_frame(dev);
litest_touch_down(dev, 0, 50, 50);
litest_touch_down(dev, 1, 55, 55);
litest_touch_down(dev, 2, 99, 55); /* edge palm */
litest_pop_event_frame(dev);
libinput_dispatch(li);
litest_touch_up(dev, 2); /* release the palm */
litest_assert_empty_queue(li);
litest_touch_up(dev, 0);
litest_touch_up(dev, 1);
libinput_dispatch(li);
litest_assert_button_event(li, BTN_RIGHT,
LIBINPUT_BUTTON_STATE_PRESSED);
litest_assert_button_event(li, BTN_RIGHT,
LIBINPUT_BUTTON_STATE_RELEASED);
litest_assert_empty_queue(li);
}
END_TEST
TEST_COLLECTION(touchpad_tap)
{
struct range any_tap_range = {1, 4};
@ -3769,4 +3803,5 @@ TEST_COLLECTION(touchpad_tap)
litest_add_ranged("tap:palm", touchpad_tap_palm_multitap_click, LITEST_TOUCHPAD, LITEST_ANY, &multitap_range);
litest_add("tap:palm", touchpad_tap_palm_click_then_tap, LITEST_TOUCHPAD, LITEST_ANY);
litest_add("tap:palm", touchpad_tap_palm_dwt_tap, LITEST_TOUCHPAD, LITEST_ANY);
litest_add("tap:palm", touchpad_tap_palm_3fg_start, LITEST_TOUCHPAD, LITEST_ANY);
}