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/*****************************************************************************
*
* grail - Gesture Recognition And Instantiation Library
*
* Copyright (C) 2010-2011 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/>.
*
****************************************************************************/
#ifndef _GRAIL_BUFFER_H
#define _GRAIL_BUFFER_H
#include <grail.h>
#define DIM_GRAIL_EVENTS 512
struct grailbuf {
int head;
int tail;
struct grail_event buffer[DIM_GRAIL_EVENTS];
};
static inline void grailbuf_clear(struct grailbuf *buf)
{
buf->head = buf->tail = 0;
}
static inline int grailbuf_empty(const struct grailbuf *buf)
{
return buf->head == buf->tail;
}
static inline void grailbuf_put(struct grailbuf *buf,
const struct grail_event *ev)
{
buf->buffer[buf->head++] = *ev;
buf->head &= DIM_GRAIL_EVENTS - 1;
}
static inline void grailbuf_get(struct grailbuf *buf,
struct grail_event *ev)
{
*ev = buf->buffer[buf->tail++];
buf->tail &= DIM_GRAIL_EVENTS - 1;
}
#endif
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