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#ifndef UNSUPPORTED
static void
do_stereogram(void *data, struct taskinfo *task, int r1, int r2)
{
struct filter *f = (struct filter *) data;
int i, y, lc;
struct stereogramdata *s = (struct stereogramdata *) f->data;
register cpixel_t *cs, *c, *src, *src1, *ce;
register spixel_t *c1;
unsigned int *pixels = f->image->palette->pixels;
s->minc = NCOLORS;
for (i = r1; i < r2; i++) {
int i1;
for (i1 = 0; i1 < 2; i1++) {
c1 = (spixel_t *) f->childimage->currlines[i];
c = cs = (cpixel_t *) f->image->currlines[2 * i + i1];
ce = p_add(cs, f->image->width);
src = src1 = c;
lc = 1024;
while (c < ce) {
y = *c1;
if (y == lc)
p_inc(src, 2);
else {
lc = y;
if (y < s->minc && y != 0)
s->minc = y;
y = table[y];
src = p_add(c, -y);
}
if (src < src1) {
p_set(c, pixels[(rand() & 15)]);
p_setp(c, 1, pixels[(rand() & 15)]);
} else {
if (src <= cs) {
p_set(c, pixels[(rand() & 15)]);
p_setp(c, 1, pixels[(rand() & 15)]);
} else {
p_copy(c, 0, src, 0);
p_copy(c, 1, src, 1);
}
src1 = src;
}
p_inc(c, 2);
c1++;
}
}
}
}
#endif
#undef do_stereogram
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