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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>
*
****************************************************************************/
#ifndef _GRAIL_GESTURE_BUFFER_H
#define _GRAIL_GESTURE_BUFFER_H
#include <grail.h>
#define DIM_GESTURE_EVENTS 512
struct gesture_event {
touch_time_t time;
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
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