diff options
Diffstat (limited to 'include/mtdev-evbuf.h')
| -rw-r--r-- | include/mtdev-evbuf.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/include/mtdev-evbuf.h b/include/mtdev-evbuf.h new file mode 100644 index 0000000..6a63d6d --- /dev/null +++ b/include/mtdev-evbuf.h @@ -0,0 +1,57 @@ +/*************************************************************************** + * + * Multitouch X driver + * Copyright (C) 2008 Henrik Rydberg <rydberg@euromail.se> + * + * 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 2 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, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + **************************************************************************/ + +#ifndef MTDEV_EVBUF_H +#define MTDEV_EVBUF_H + +#include "common.h" + +struct EventBuffer { + int head; + int tail; + struct input_event buffer[DIM_EVENTS]; +}; + +static inline void evbuf_init(struct EventBuffer *evbuf) +{ + memset(evbuf, 0, sizeof(*evbuf)); +} + +static inline int evbuf_empty(const struct EventBuffer *evbuf) +{ + return evbuf->head == evbuf->tail; +} + +static inline void evbuf_push(struct EventBuffer *evbuf, + const struct input_event *ev) +{ + evbuf->buffer[evbuf->head++] = *ev; + evbuf->head &= DIM_EVENTS - 1; +} + +static inline void evbuf_pop(struct EventBuffer *evbuf, + struct input_event *ev) +{ + *ev = evbuf->buffer[evbuf->tail++]; + evbuf->tail &= DIM_EVENTS - 1; +} + +#endif |