6 files changed, 25 insertions, 10 deletions

diff --git a/include/grail.h b/include/grail.h
index a100b36..0fa4473 100644
--- a/include/grail.h
+++ b/include/grail.h
@@ -88,4 +88,7 @@ int grail_idle(struct grail *ge, int fd, int ms);
 int grail_pull(struct grail *ge, int fd);
 void grail_close(struct grail *ge, int fd);
 
+void grail_get_units(struct grail_coord *min, struct grail_coord *max,
+                     const struct grail *ge);
+
 #endif
diff --git a/src/grail-api.c b/src/grail-api.c
index c4a88df..2c6c438 100644
--- a/src/grail-api.c
+++ b/src/grail-api.c
@@ -95,13 +95,14 @@ int grail_open(struct grail *ge, int fd)
         x = calloc(1, sizeof(*x));
         if (!x)
                 return -ENOMEM;
+        ge->impl = x;
         ret = gin_init(ge);
         if (ret)
                 goto freemem;
         ret = touch_dev_open(&x->dev, fd);
         if (ret)
                 goto freegin;
-        ret = gru_init(ge, &x->dev.caps);
+        ret = gru_init(ge);
         if (ret)
                 goto freedev;
         x->fd = fd;
@@ -110,7 +111,6 @@ int grail_open(struct grail *ge, int fd)
         ret = pthread_create(&x->thread, NULL, grail_thread, x);
         if (ret)
                 goto freegru;
-        ge->impl = x;
         touch_engine_init(&x->engine, tp_event, tp_sync, ge);
         touch_engine_attach(&x->engine, &x->dev);
         return 0;
@@ -122,6 +122,7 @@ int grail_open(struct grail *ge, int fd)
         gin_destroy(ge);
  freemem:
         free(x);
+        ge->impl = 0;
         return ret;
 }
 
@@ -168,3 +169,13 @@ int grail_pull(struct grail *ge, int fd)
         pthread_mutex_unlock(&x->mutex);
         return 1;
 }
+
+void grail_get_units(struct grail_coord *min, struct grail_coord *max,
+                     const struct grail *ge)
+{
+        const struct touch_dev_caps *caps = &ge->impl->dev.caps;
+        min->x = caps->info[TP_POS_X].minimum;
+        min->y = caps->info[TP_POS_Y].minimum;
+        max->x = caps->info[TP_POS_X].maximum;
+        max->y = caps->info[TP_POS_Y].maximum;
+}
diff --git a/src/grail-gestures.c b/src/grail-gestures.c
index 5ab12a8..e1bf622 100644
--- a/src/grail-gestures.c
+++ b/src/grail-gestures.c
@@ -119,12 +119,14 @@ static int move_update(struct filter_model *m, float val)
         return m->active;
 }
 
-void gru_init_motion(struct grail *ge, const struct touch_dev_caps *caps)
+void gru_init_motion(struct grail *ge)
 {
         struct gesture_recognizer *gru = ge->gru;
         struct move_model *state = &gru->move;
-        float x = caps->info[TP_POS_X].maximum - caps->info[TP_POS_X].minimum;
-        float y = caps->info[TP_POS_Y].maximum - caps->info[TP_POS_Y].minimum;
+        struct grail_coord min, max;
+        grail_get_units(&min, &max, ge);
+        float x = max.x - min.x;
+        float y = max.y - min.y;
         float r = sqrt(x * x + y * y);
         state->x.fuzz = x / SN_MOVE;
         state->y.fuzz = y / SN_MOVE;
diff --git a/src/grail-gestures.h b/src/grail-gestures.h
index 57204ad..663d357 100644
--- a/src/grail-gestures.h
+++ b/src/grail-gestures.h
@@ -43,8 +43,7 @@ struct move_model {
         grail_time_t time;
 };
 
-void gru_init_motion(struct grail *ge,
-                     const struct touch_dev_caps *caps);
+void gru_init_motion(struct grail *ge);
 void gru_motion(struct grail *ge,
                 const struct touch_frame *frame);
 void gru_event(struct grail *ge, int gid,
diff --git a/src/grail-recognizer.c b/src/grail-recognizer.c
index bed704e..587a12a 100644
--- a/src/grail-recognizer.c
+++ b/src/grail-recognizer.c
@@ -27,14 +27,14 @@
 #include <malloc.h>
 #include <errno.h>
 
-int gru_init(struct grail *ge, const struct touch_dev_caps *caps)
+int gru_init(struct grail *ge)
 {
         struct gesture_recognizer *gru;
         gru = calloc(1, sizeof(struct gesture_recognizer));
         if (!gru)
                 return -ENOMEM;
         ge->gru = gru;
-        gru_init_motion(ge, caps);
+        gru_init_motion(ge);
         return 0;
 }
 
diff --git a/src/grail-recognizer.h b/src/grail-recognizer.h
index d3b24b3..8a5ac80 100644
--- a/src/grail-recognizer.h
+++ b/src/grail-recognizer.h
@@ -37,7 +37,7 @@ struct gesture_recognizer {
         struct tapping_model tapping;
 };
 
-int gru_init(struct grail *ge, const struct touch_dev_caps *caps);
+int gru_init(struct grail *ge);
 void gru_recognize(struct grail *ge, const struct touch_frame *frame);
 void gru_destroy(struct grail *ge);