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/*****************************************************************************
*
* 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-recognizer.h"
#include <string.h>
#include <malloc.h>
#include <errno.h>
static const touch_time_t DROP_TIMEOUT_MS = 100;
int gru_init(struct grail *ge, const struct touch_dev_caps *caps)
{
struct gesture_recognizer *gru;
gru = calloc(1, sizeof(struct gesture_recognizer));
if (!gru)
return -ENOMEM;
ge->gru = gru;
gru_init_motion(ge, caps);
return 0;
}
void gru_destroy(struct grail *ge)
{
free(ge->gru);
ge->gru = NULL;
}
static void reset_gru_state(struct grail *ge, const struct touch_frame *frame)
{
gru_reset_combo(ge, frame);
gru_reset_rotate(ge, frame);
gru_reset_zoom(ge, frame);
gru_reset_scroll(ge, frame);
gru_reset_motion(ge, frame);
}
void gru_recognize(struct grail *ge, const struct touch_frame *frame)
{
struct gesture_recognizer *gru = ge->gru;
struct move_model *move = &gru->move;
if (!ge->gin || !ge->gru)
return;
if (frame->nactive < move->ntouch &&
frame->time < gru->frame.time + DROP_TIMEOUT_MS)
return;
if (frame->nactive < 2 || frame->ncreate || frame->ndestroy) {
reset_gru_state(ge, frame);
return;
}
gru_compute_motion(ge, frame);
gru_scroll(ge, frame);
gru_zoom(ge, frame);
gru_rotate(ge, frame);
gru_combo(ge, frame);
gru->frame = *frame;
}
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