enlarge a portable bitmap with edge smoothing
pbmpscale N [
portable bitmap as input, and outputs a portable bitmap
enlarged N times. Enlargement is done by pixel replication,
with some additional smoothing of corners and edges.
1990 by Angus Duggan Copyright (C) 1989 by Jef
use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby
granted, provided that the above copyright notice appear in
all copies and that both that copyright notice and this
permission notice appear in supporting documentation. This
software is provided "as is" without express or
best for enlargements of 2. Enlargements greater than 2
should be done by as many enlargements of 2 as possible,
followed by an enlargement by the remaining factor.