1 files changed, 137 insertions, 0 deletions

diff --git a/src/touch-engine.c b/src/touch-engine.c
new file mode 100644
index 0000000..3e6870e
--- /dev/null
+++ b/src/touch-engine.c
@@ -0,0 +1,137 @@
+/*****************************************************************************
+ *
+ * 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 <grail-touch.h>
+#include <string.h>
+
+static void tp_event(struct touch_dev *dev, const struct input_event *ev)
+{
+        struct touch_engine *engine = dev->priv;
+        if (engine && engine->event)
+                engine->event(engine, ev);
+}
+
+static void update_frame(struct touch_frame *frame,
+                         int slot, int active,
+                         const grail_mask_t *mask,
+                         const touch_prop_t *prop)
+{
+        struct touch *t = &frame->touch[slot];
+        int i;
+        t->active = active;
+        grail_mask_modify(frame->touches, slot, active);
+        if (mask && prop)
+                grail_mask_foreach(i, mask, DIM_TOUCH_PROP_BYTES)
+                        t->prop[i] = prop[i];
+}
+
+static void finalize_frame(struct touch_frame *frame, touch_time_t time)
+{
+        int i, nslot = 0;
+        grail_mask_foreach(i, frame->touches, DIM_TOUCH_BYTES)
+                frame->active[nslot++] = &frame->touch[i];
+        frame->nactive = nslot;
+        frame->time = time;
+}
+
+static void tp_create(struct touch_dev *dev, int slot,
+                      const grail_mask_t *mask, const touch_prop_t *prop)
+{
+        struct touch_engine *engine = dev->priv;
+        if (engine) {
+                engine->frame.ncreate++;
+                update_frame(&engine->frame, slot, 1, mask, prop);
+        }
+}
+
+static void tp_modify(struct touch_dev *dev, int slot,
+                      const grail_mask_t *mask, const touch_prop_t *prop)
+{
+        struct touch_engine *engine = dev->priv;
+        if (engine) {
+                engine->frame.nmodify++;
+                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) {
+                engine->frame.ndestroy++;
+                update_frame(&engine->frame, slot, 0, 0, 0);
+        }
+}
+
+static void tp_sync(struct touch_dev *dev, const struct input_event *syn)
+{
+        static const touch_time_t ms = 1000;
+        struct touch_engine *engine = dev->priv;
+        touch_time_t time = syn->time.tv_usec / ms + syn->time.tv_sec * ms;
+        if (engine) {
+                finalize_frame(&engine->frame, time);
+                if (engine->sync)
+                        engine->sync(engine, syn);
+                engine->frame.ncreate = 0;
+                engine->frame.nmodify = 0;
+                engine->frame.ndestroy = 0;
+        }
+}
+
+void touch_engine_init(struct touch_engine *engine,
+                       void (*event)(struct touch_engine *engine,
+                                     const struct input_event *ev),
+                       void (*sync)(struct touch_engine *engine,
+                                    const struct input_event *ev),
+                       void *priv)
+{
+        int i;
+        memset(engine, 0, sizeof(*engine));
+        for (i = 0; i < DIM_TOUCH; i++)
+                engine->frame.touch[i].slot = i;
+        engine->event = event;
+        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;
+}
+