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/*
* Copyright 1994-2022 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/>.
*/
#include "context.h"
uint32_t version = 0;
uint32_t options = BO_DISPLACE | BO_LENS | BO_NOT_LENS;
char desc[] = "Nested spirals filter";
char dname[] = "Spirals nested";
static uint32_t *map;
#define DST(x,y) map[(y*WIDTH)+x]
#define SRC(x,y) (reversed ? ((MAXY-y)*WIDTH+(MAXX-x)) : ((y*WIDTH)+x))
static void
init(const uint16_t startx, const uint16_t starty,
char xinc, char yinc,
short distx, short disty, uint8_t delta, const int reversed)
{
uint16_t donex, doney;
short x = startx, y = starty;
while ((distx >= 0) || (disty >= 0)) {
/* horizontal line: S----->E */
for (donex = 0; donex < distx; donex++) {
/* if (xinc == 1) {
uint16_t dx;
for (dx = 0; dx < SWIDTH; dx++)
*/
DST(x,y) = SRC(x,y);
x += xinc;
}
xinc = -xinc;
distx -= delta;
/* vertical line: S */
/* | */
/* v */
/* E */
for (doney = 0; doney < disty; doney++) {
DST(x,y) = SRC(x,y);
y += yinc;
}
yinc = -yinc;
disty -= delta;
}
}
int8_t
create(Context_t *ctx)
{
map = xcalloc(BUFFSIZE, sizeof(uint32_t));
init(0, 0, +1, +1, MAXSCREEN-2, MINSCREEN-2, 2, 0);
init(MAXX, MAXY, -1, -1, MAXSCREEN-2, MINSCREEN-2, 2, 1);
return 1;
}
void
destroy(Context_t *ctx)
{
xfree(map);
}
void
run(Context_t *ctx)
{
uint32_t k;
const Buffer8_t *src = active_buffer(ctx);
Buffer8_t *dst = passive_buffer(ctx);
for (k = 0; k < BUFFSIZE; k++) {
dst->buffer[k] = src->buffer[map[k]];
}
}
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