ref: 2aec1f8a09ae0bc9fb269d84ef53defebc47eede
dir: /sys/src/cmd/postscript/psfiles/roundpage.ps/
%
% Tries to round clipping path dimensions, as stored in array pagebbox, so they
% match one of the known sizes in the papersizes array. Lower left coordinates
% are always set to 0.
%
/roundpagebbox {
7 dict begin
/papersizes [8.5 inch 11 inch 14 inch 17 inch] def
/mappapersize {
/val exch def
/slop .5 inch def
/diff slop def
/j 0 def
0 1 papersizes length 1 sub {
/i exch def
papersizes i get val sub abs
dup diff le {/diff exch def /j i def} {pop} ifelse
} for
diff slop lt {papersizes j get} {val} ifelse
} def
pagebbox 0 0 put
pagebbox 1 0 put
pagebbox dup 2 get mappapersize 2 exch put
pagebbox dup 3 get mappapersize 3 exch put
end
} bind def