Disable time-dependent filtering for current XI2.1

Velocity-adjusted positioning and Kalman filters depend on accurate
time stamps on events. Until we have device event times, disable this
functionality for XI2.1

Tested-by: Chase Douglas <chase.douglas@canonical.com>
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>

1 files changed, 17 insertions, 1 deletions

diff --git a/src/frame-xi2.c b/src/frame-xi2.c
index 737cff2..5257dab 100644
--- a/src/frame-xi2.c
+++ b/src/frame-xi2.c
@@ -265,6 +265,22 @@ int utouch_frame_configure_xi2(utouch_frame_handle fh,
         return 1;
 }
 
+const struct utouch_frame *sync_xi2(utouch_frame_handle fh,
+                                    utouch_frame_time_t time)
+{
+        struct utouch_frame *next = fh->next;
+        int i;
+
+        /* no velocity adjustments without device time stamps in place */
+        for (i = 0; i < fh->num_slots; i++) {
+                struct utouch_contact *q = next->slots[i];
+                q->vx = 0;
+                q->vy = 0;
+        }
+
+        return utouch_frame_sync(fh, time);
+}
+
 const struct utouch_frame *
 utouch_frame_pump_xi2(utouch_frame_handle fh, const XIDeviceEvent *ev)
 {
@@ -292,7 +308,7 @@ utouch_frame_pump_xi2(utouch_frame_handle fh, const XIDeviceEvent *ev)
                                 handle_event(fh, slot, i, value[num++]);
                 if (ev->evtype == XI_TouchEnd)
                         utouch_frame_get_current_slot(fh)->id = -1;
-                return utouch_frame_sync(fh, ev->time);
+                return sync_xi2(fh, ev->time);
         case XI_PropertyEvent:
                 prop_ev = (XIPropertyEvent *)ev;
                 if (prop_ev->property == transform_atom && ev->display) {