% solid black instead of gray; use with GF2DVI
mode=aps; sqsize=2;
%mode:=dover; sqsize:=1; % temporary!
edges pixelrep;
pixelrep=nulledges;
addto pixelrep contour
	((0,0)..(0,1)&(0,1)..(1,1)&(1,1)..(1,0)&(1,0)..(0,0)&cycle) scaled 4sqsize;
input gray