Disable rotation gestures for semi-mt devices

To avoid poor user experience with semi-mt devices, disable
rotation detection, such that only drag and scale is emitted.

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

1 files changed, 5 insertions, 2 deletions

diff --git a/src/grail-gestures.c b/src/grail-gestures.c
index fd8b26b..dde8d60 100644
--- a/src/grail-gestures.c
+++ b/src/grail-gestures.c
@@ -166,6 +166,7 @@ void gru_init_motion(struct grail *ge)
 void gru_motion(struct grail *ge,
                 const struct utouch_frame *frame)
 {
+        const struct utouch_surface *s = utouch_frame_get_surface(ge->impl->fh);
         struct gesture_recognizer *gru = ge->gru;
         struct move_model *m = &gru->move;
         grail_time_t t = frame->time;
@@ -196,8 +197,10 @@ void gru_motion(struct grail *ge,
                 r = compute_radius(x, y, frame);
                 r = move_filter(&m->fm[FM_R], r);
                 a = m->fm[FM_A].value;
-                a += compute_rotation(x, y, r, frame);
-                a = move_filter(&m->fm[FM_A], a);
+                if (!s->is_semi_mt) {
+                        a += compute_rotation(x, y, r, frame);
+                        a = move_filter(&m->fm[FM_A], a);
+                }
                 move_update(m, FM_X, x, t);
                 move_update(m, FM_Y, y, t);
                 move_update(m, FM_R, r, t);