From 7db9d8d76ff61c4802ac15559dcea6fa54ff567a Mon Sep 17 00:00:00 2001 From: Henrik Rydberg Date: Fri, 6 Aug 2010 21:11:17 +0200 Subject: initial bzr repo at rev 27 --- src/gebuf.h | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) create mode 100644 src/gebuf.h (limited to 'src/gebuf.h') diff --git a/src/gebuf.h b/src/gebuf.h new file mode 100644 index 0000000..3f71ab5 --- /dev/null +++ b/src/gebuf.h @@ -0,0 +1,70 @@ +/***************************************************************************** + * + * 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 . + * + * Authors: + * Henrik Rydberg + * + ****************************************************************************/ + +#ifndef _GRAIL_GESTURE_BUFFER_H +#define _GRAIL_GESTURE_BUFFER_H + +#include + +#define DIM_GESTURE_EVENTS 512 + +struct gesture_event { + int ntouch; + int nprop; + touch_time_t time; + struct grail_coord pos; + 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 -- cgit v1.2.3