Gesture Recognition And Instantiation Library (grail)

The aim of this first commit is to get down to hard testing of concepts,
and the library currently has two test programs, touch and grail,
which can be run on commandline. Touch tests the touch interface,
and grail tests the gesture interface.

Expect thinking errors and some glitches. Other than that, the code
runs fine.

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

1 files changed, 62 insertions, 0 deletions

diff --git a/include/gesture-buffer.h b/include/gesture-buffer.h
new file mode 100644
index 0000000..49a6dd1
--- /dev/null
+++ b/include/gesture-buffer.h
@@ -0,0 +1,62 @@
+/*****************************************************************************
+ *
+ * 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 <gesture.h>
+
+#define DIM_GESTURE_EVENTS 512
+
+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