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/*
* Copyright 1994-2012 Olivier Girondel
*
* This file is part of lebiniou.
*
* lebiniou 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.
*
* lebiniou 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 lebiniou. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __SHAKER_H
#define __SHAKER_H
#define SOUND_DISTURB_K 32
static inline void
check_width(short *value)
{
if (*value < 0)
*value += WIDTH;
else if (*value >= (short)WIDTH)
*value -= WIDTH;
}
static inline void
check_height(short *value)
{
if (*value < 0)
*value += HEIGHT;
else if (*value >= (short)HEIGHT)
*value -= HEIGHT;
}
static inline void
displace(const Buffer8_t *src, Buffer8_t *dst,
short i, short j, short dx, short dy)
{
if ((i < SOUND_DISTURB_K) || (i > MAXX - SOUND_DISTURB_K))
check_width(&dx);
if ((j < SOUND_DISTURB_K) || (j > MAXY - SOUND_DISTURB_K))
check_height(&dy);
set_pixel_nc(dst, i, j, get_pixel_nc(src, dx, dy));
}
#endif /* __SHAKER_H */
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