make event units public in the api

Add grail_get_units() to the api, so so that applications can
extract the min/max coordinates used in the gesture events.

Signed-off-by: Henrik Rydberg <rydberg@bitmath.org>

1 files changed, 13 insertions, 2 deletions

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;
+}