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/evbuf.h | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 src/evbuf.h (limited to 'src/evbuf.h') diff --git a/src/evbuf.h b/src/evbuf.h new file mode 100644 index 0000000..dc5ad1e --- /dev/null +++ b/src/evbuf.h @@ -0,0 +1,64 @@ +/***************************************************************************** + * + * mtdev - Multitouch Protocol Translation Library (MIT license) + * + * Copyright (C) 2010 Henrik Rydberg + * Copyright (C) 2010 Canonical Ltd. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + * + ****************************************************************************/ + +#ifndef GRAIL_EVBUF_H +#define GRAIL_EVBUF_H + +#define DIM_EVENTS 512 + +struct evbuf { + int head; + int tail; + struct input_event buffer[DIM_EVENTS]; +}; + +static inline void evbuf_clear(struct evbuf *evbuf) +{ + evbuf->head = evbuf->tail = 0; +} + +static inline int evbuf_empty(const struct evbuf *evbuf) +{ + return evbuf->head == evbuf->tail; +} + +static inline void evbuf_put(struct evbuf *evbuf, + const struct input_event *ev) +{ + evbuf->buffer[evbuf->head++] = *ev; + evbuf->head &= DIM_EVENTS - 1; +} + +static inline void evbuf_get(struct evbuf *evbuf, + struct input_event *ev) +{ + *ev = evbuf->buffer[evbuf->tail++]; + evbuf->tail &= DIM_EVENTS - 1; +} + +#endif -- cgit v1.2.3