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evdev: Wait for SYN event before sending events over to the client

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The issue was that touch::down event from the compositor to client apps
would send the previous motion events coordinates and this obviously made
the client do the wrong thing. This happened because we were not waiting
for a SYN event to come from evdev before sending down, motion or up events.

https://bugs.freedesktop.org/show_bug.cgi?id=51909
This commit is contained in:
Satyeshwar Singh 2013-02-27 15:26:23 -05:00 • committed by Kristian Høgsberg
parent 71c1ef42f0
commit eb4fa8e4f5
3 changed files with 7 additions and 2 deletions
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2
src/evdev-touchpad.c
View file

@ -481,7 +481,7 @@ touchpad_update_state(struct touchpad_dispatch *touchpad, uint32_t time)
touchpad->device->rel.dx = wl_fixed_from_double(dx);
touchpad->device->rel.dy = wl_fixed_from_double(dy);
touchpad->device->pending_events |=
EVDEV_RELATIVE_MOTION;
EVDEV_RELATIVE_MOTION | EVDEV_SYN;
} else if (touchpad->finger_state == TOUCHPAD_FINGERS_TWO) {
if (dx != 0.0)
notify_axis(touchpad->device->seat,

6
src/evdev.c
View file

@ -234,9 +234,10 @@ evdev_flush_motion(struct evdev_device *device, uint32_t time)
{
struct weston_seat *master = device->seat;
if (!device->pending_events)
if (!(device->pending_events & EVDEV_SYN))
return;
device->pending_events &= ~EVDEV_SYN;
if (device->pending_events & EVDEV_RELATIVE_MOTION) {
notify_motion(master, time,
master->seat.pointer->x + device->rel.dx,
@ -292,6 +293,9 @@ fallback_process(struct evdev_dispatch *dispatch,
case EV_KEY:
evdev_process_key(device, event, time);
break;
case EV_SYN:
device->pending_events |= EVDEV_SYN;
break;
}
}

1
src/evdev.h
View file

@ -34,6 +34,7 @@ enum evdev_event_type {
EVDEV_ABSOLUTE_MT_MOTION = (1 << 2),
EVDEV_ABSOLUTE_MT_UP = (1 << 3),
EVDEV_RELATIVE_MOTION = (1 << 4),
EVDEV_SYN = (1 << 5),
};
enum evdev_device_capability {