#!/usr/bin/perl -w

$scale = 4;

my $file = shift || die;
die "empty file $file" if !-s $file;
open(FILE, $file) || die;

die "Bad magic" unless <FILE> =~ /^%!PS-Adobe-/;

my $gs = undef;
while (<FILE>) {
    if (my($llx, $lly, $urx, $ury) =
          /^%%BoundingBox:\s*(-?[0-9\.]+)\s+(-?[0-9\.]+)\s+(-?[0-9\.]+)\s+(-?[0-9\.]+)/)
    {
	 warn "$file: BBox: $llx $lly $urx $ury\n";

         my($w,$h) = map {$_ *= $scale} ($urx - $llx, $ury - $lly);

         open(GS, "| gs -sDEVICE=ppm -sOutputFile=- -g${w}x$h -q -") || die;
	 $gs++;

	 print GS "$scale dup scale $llx neg $lly neg translate %\n";
	
    } elsif (/^%/ && !$gs) {
         # ignore comments
    } elsif (!$gs) {
	 die "No bounding box found\n";
    } else {
         print GS;
    }
}

print GS "\nshowpage\n";
close(GS);