- my $ppm= "P2\n$w $h\n1\n";
- for (my $y=0; $y<$h; $y++) {
- for (my $x=0; $x<$w; $x++) {
- $ppm .= sprintf " %d", !($d[$x] & (1<<$y));
+
+ my $pgm= "P2\n$h $w\n7\n";
+ map { # x, left to right
+ m/[^0-7]/ and die "$_ ?";
+ my $l= $_;
+ $l =~ s/./ $&/g;
+ $pgm .= "$l\n";
+ } @d;
+
+ my $key= join ' ', $ctx, @d;
+
+ $pgm= pipeval($pgm,
+ "pnmflip -xy",
+ "pnmnoraw");
+
+ my $icon= pipeval($pgm,
+ "pnmscale -xysize 156 ".($h*4),
+ 'pgmtopbm -threshold',
+ 'pnminvert',
+ 'pbmtoascii -2x4');
+
+ my $whole= pipeval($pgm,
+ "pnmscale 4",
+ 'pgmtopbm -fs',
+ 'pnminvert',
+ 'pbmtoascii');
+
+ my $entry= "$ctx\n$str\n$key\n";
+
+ return ($ctx,$str,$pgm,$key,$str, $w*4,$icon,$whole,$entry);
+}
+
+#---------- useful stuff ----------
+
+sub pipeval ($@) {
+ my ($val, @cmds) = @_;
+ my (@pids);
+
+ my $lastpipe;
+
+ foreach my $cmd ('',@cmds) {
+ my $pipe= new IO::Pipe or die $!;
+ my $pid= fork(); defined $pid or die $!;
+
+ if (!$pid) {
+ $pipe->writer();
+ if (!$lastpipe) {
+ print $pipe $val or die $!;
+ exit 0;
+ } else {
+ open STDIN, '<&', $lastpipe or die $!;
+ open STDOUT, '>&', $pipe or die $!;
+ close $lastpipe or die $!;
+ close $pipe or die $!;
+ exec $cmd; die $!;
+ }