initial bzr repo at rev 27

1 files changed, 70 insertions, 0 deletions

diff --git a/src/gebuf.h b/src/gebuf.h
new file mode 100644
index 0000000..3f71ab5
--- /dev/null
+++ b/src/gebuf.h
@@ -0,0 +1,70 @@
+/*****************************************************************************
+ *
+ * grail - Gesture Recognition And Instantiation Library
+ *
+ * Copyright (C) 2010 Canonical Ltd.
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *      Henrik Rydberg <rydberg@bitmath.org>
+ *
+ ****************************************************************************/
+
+#ifndef _GRAIL_GESTURE_BUFFER_H
+#define _GRAIL_GESTURE_BUFFER_H
+
+#include <grail.h>
+
+#define DIM_GESTURE_EVENTS 512
+
+struct gesture_event {
+        int ntouch;
+        int nprop;
+        touch_time_t time;
+        struct grail_coord pos;
+        grail_prop_t prop[DIM_GRAIL_PROP];
+};
+
+struct gebuf {
+        int head;
+        int tail;
+        struct gesture_event buffer[DIM_GESTURE_EVENTS];
+};
+
+static inline void gebuf_clear(struct gebuf *gebuf)
+{
+        gebuf->head = gebuf->tail = 0;
+}
+
+static inline int gebuf_empty(const struct gebuf *gebuf)
+{
+        return gebuf->head == gebuf->tail;
+}
+
+static inline void gebuf_put(struct gebuf *gebuf,
+                             const struct gesture_event *ev)
+{
+        gebuf->buffer[gebuf->head++] = *ev;
+        gebuf->head &= DIM_GESTURE_EVENTS - 1;
+}
+
+static inline void gebuf_get(struct gebuf *gebuf,
+                             struct gesture_event *ev)
+{
+        *ev = gebuf->buffer[gebuf->tail++];
+        gebuf->tail &= DIM_GESTURE_EVENTS - 1;
+}
+
+#endif