X-Git-Url: http://git.hungrycats.org/cgi-bin/gitweb.cgi?p=xscreensaver;a=blobdiff_plain;f=hacks%2Fabstractile.c;h=f1abbb60d20ad4cd588be049026cf205f1510e35;hp=4e80d7b7b5774a24213aaa9533cf9f7e3ca9f99a;hb=d5186197bc394e10a4402f7f6d23fbb14103bc50;hpb=6afd6db0ae9396cd7ff897ade597cd5483f49b0e

diff --git a/hacks/abstractile.c b/hacks/abstractile.c
index 4e80d7b7..f1abbb60 100644
--- a/hacks/abstractile.c
+++ b/hacks/abstractile.c
@@ -90,7 +90,8 @@ struct state {
     /* draw, erase, fill, init, line, object, z indexes */
   unsigned int di, ei, fi, ii, bi, li, eli, oi, zi;
   /* size variables */
-  unsigned int gridx, gridy, gridn;                     /* grid size */
+  int gridx, gridy;                     /* grid size */
+  unsigned int gridn;
   int lwid, bwid, swid;/* line width, background width, shadow width */
   int narray, max_wxh;
   int elwid, elpu, egridx, egridy; /* for now */
@@ -205,6 +206,7 @@ _init_zlist(struct state *st)
 
   st->gridx=st->xgwa.width/st->lwid;
   st->gridy=st->xgwa.height/st->lwid;
+  if ((st->gridx <= 0) || (st->gridy <= 0)) abort();
   st->gridn=st->gridx*st->gridy;
   /* clear grid */
   for (z=0; z<st->gridn; z++) {