Remove the obsoleted transformation filter

Remove the additional filtering performed in the gestural
transforms. This used to serve a purpose during development against
devices without per-contact filtering. Since then, all devices are
filtered, rendering the extra filtering obsolete.

This patch also fixes a problem with rotation events.  Currently, if
you rotate very fast, the rotation angle will be close to the true
angle. However, if you rotate very slow, the rotation angle will be
much less than the true rotation angle.

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

1 files changed, 1 insertions, 18 deletions

diff --git a/src/grail-gestures.c b/src/grail-gestures.c
index c4ae0dc..b461dc3 100644
--- a/src/grail-gestures.c
+++ b/src/grail-gestures.c
@@ -87,18 +87,6 @@ static float compute_rotation(float x, float y, float r,
         return da;
 }
 
-/* Response-augmented EWMA filter, courtesy of Vojtech Pavlik */
-static float move_filter(const struct filter_model *m, float val)
-{
-        if (val > m->value - m->fuzz / 2 && val < m->value + m->fuzz / 2)
-                return m->value;
-        if (val > m->value - m->fuzz && val < m->value + m->fuzz)
-                return (m->value * 3 + val) / 4;
-        if (val > m->value - m->fuzz * 2 && val < m->value + m->fuzz * 2)
-                return (m->value + val) / 2;
-        return val;
-}
-
 static void move_reset(struct move_model *m, int i, float x, grail_time_t t)
 {
         struct filter_model *fm = &m->fm[i];
@@ -192,15 +180,10 @@ void gru_motion(struct grail *ge,
                 m->single = 1;
                 m->multi = 0;
         } else {
-                x = move_filter(&m->fm[FM_X], x);
-                y = move_filter(&m->fm[FM_Y], y);
                 r = compute_radius(x, y, frame);
-                r = move_filter(&m->fm[FM_R], r);
                 a = m->fm[FM_A].value;
-                if (!s->is_semi_mt) {
+                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);