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http://www.jwz.org/xscreensaver/xscreensaver-5.12.tar.gz
[xscreensaver]
/
hacks
/
ripples.c
diff --git
a/hacks/ripples.c
b/hacks/ripples.c
index fac61995060e103740a8c5212a1ce64237189925..e030b1cd1d85f7cba8715e7f7b888803d000983d 100644
(file)
--- a/
hacks/ripples.c
+++ b/
hacks/ripples.c
@@
-703,6
+703,7
@@
sinc(struct state *st, double x)
int i;
i = (int)(x * TABLE + 0.5);
if (i >= TABLE) i = (TABLE-1) - (i-(TABLE-1));
int i;
i = (int)(x * TABLE + 0.5);
if (i >= TABLE) i = (TABLE-1) - (i-(TABLE-1));
+ if (i < 0) return 0.;
return st->cos_tab[i];
#elif 0
return cos(x * M_PI/2);
return st->cos_tab[i];
#elif 0
return cos(x * M_PI/2);
@@
-732,7
+733,7
@@
add_circle_drop(struct state *st, int x, int y, int radius, int dheight)
r = cx*cx + cy*cy;
if (r > r2) break;
buf[xx + yy*st->width] =
r = cx*cx + cy*cy;
if (r > r2) break;
buf[xx + yy*st->width] =
- (short)(dheight * sinc(st,
sqrt(r)/radius
));
+ (short)(dheight * sinc(st,
(radius > 0) ? sqrt(r)/radius : 0
));
}
}
}
}