if (timediff < utimeperframe) {
/* fprintf(stderr,"sleeping for %i\n",utimeperframe-timediff); */
this_delay = (utimeperframe-timediff);
if (timediff < utimeperframe) {
/* fprintf(stderr,"sleeping for %i\n",utimeperframe-timediff); */
this_delay = (utimeperframe-timediff);