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/*****************************************************************************
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* grail - Gesture Recognition And Instantiation Library
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* Copyright (C) 2010 Canonical Ltd.
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* This program is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or (at your
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* option) any later version.
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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* Henrik Rydberg <rydberg@bitmath.org>
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****************************************************************************/
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#ifndef _GRAIL_GESTURE_BUFFER_H
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#define _GRAIL_GESTURE_BUFFER_H
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#define DIM_GESTURE_EVENTS 512
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struct gesture_event buffer[DIM_GESTURE_EVENTS];
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static inline void gebuf_clear(struct gebuf *gebuf)
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gebuf->head = gebuf->tail = 0;
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static inline int gebuf_empty(const struct gebuf *gebuf)
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return gebuf->head == gebuf->tail;
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static inline void gebuf_put(struct gebuf *gebuf,
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const struct gesture_event *ev)
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gebuf->buffer[gebuf->head++] = *ev;
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gebuf->head &= DIM_GESTURE_EVENTS - 1;
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static inline void gebuf_get(struct gebuf *gebuf,
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struct gesture_event *ev)
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*ev = gebuf->buffer[gebuf->tail++];
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gebuf->tail &= DIM_GESTURE_EVENTS - 1;