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, 126 insertions, 0 deletions

diff --git a/src/touch-engine.c b/src/touch-engine.c
new file mode 100644
index 0000000..b6774f3
--- /dev/null
+++ b/src/touch-engine.c
@@ -0,0 +1,126 @@
+/*****************************************************************************
+ *
+ * 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>
+ *
+ ****************************************************************************/
+
+#include <touch-engine.h>
+#include <string.h>
+
+static void tp_event(struct touch_dev *dev, const struct input_event *ev)
+{
+}
+
+static void update_frame(struct touch_frame *frame,
+                         int slot, int active,
+                         const touch_prop_mask_t *mask,
+                         const touch_prop_t *prop)
+{
+        struct touch *touch = &frame->touch[slot];
+        touch->active = active;
+        if (mask && prop) {
+                for (int i = 0; i < DIM_TOUCH_PROP; i++)
+                        if (has_prop(mask, i))
+                                touch->prop[i] = prop[i];
+        }
+}
+
+static void finalize_frame(struct touch_frame *frame)
+{
+        int last = -1;
+        frame->ntouch = 0;
+        frame->slot = -1;
+        for (int i = 0; i < DIM_TOUCH_PROP; i++) {
+                frame->touch[i].next = -1;
+                if (frame->touch[i].active) {
+                        if (last < 0)
+                                frame->slot = i;
+                        else
+                                frame->touch[last].next = i;
+                        last = i;
+                        frame->ntouch++;
+                }
+        }
+}
+
+static void tp_create(struct touch_dev *dev, int slot,
+                      const touch_prop_mask_t *mask, const touch_prop_t *prop)
+{
+        struct touch_engine *engine = dev->priv;
+        if (engine)
+                update_frame(&engine->frame, slot, 1, mask, prop);
+}
+
+static void tp_modify(struct touch_dev *dev, int slot,
+                      const touch_prop_mask_t *mask, const touch_prop_t *prop)
+{
+        struct touch_engine *engine = dev->priv;
+        if (engine)
+                update_frame(&engine->frame, slot, 1, mask, prop);
+}
+
+static void tp_destroy(struct touch_dev *dev, int slot)
+{
+        struct touch_engine *engine = dev->priv;
+        if (engine)
+                update_frame(&engine->frame, slot, 0, 0, 0);
+}
+
+static void tp_sync(struct touch_dev *dev, touch_time_t time)
+{
+        struct touch_engine *engine = dev->priv;
+        if (engine) {
+                finalize_frame(&engine->frame);
+                if (engine->sync)
+                        engine->sync(engine, time);
+        }
+}
+
+void touch_engine_init(struct touch_engine *engine,
+                       void (*sync)(struct touch_engine *engine,
+                                    touch_time_t time),
+                       void *priv)
+{
+        memset(engine, 0, sizeof(*engine));
+        engine->sync = sync;
+        engine->priv = priv;
+}
+
+void touch_engine_attach(struct touch_engine *engine, struct touch_dev *dev)
+{
+        dev->priv = engine;
+        dev->event = tp_event;
+        dev->create = tp_create;
+        dev->modify = tp_modify;
+        dev->destroy = tp_destroy;
+        dev->sync = tp_sync;
+}
+
+void touch_engine_detach(struct touch_engine *engine, struct touch_dev *dev)
+{
+        dev->sync = 0;
+        dev->destroy = 0;
+        dev->modify = 0;
+        dev->create = 0;
+        dev->event = 0;
+        dev->priv = 0;
+}
+