| #!/usr/bin/perl |
| ## ----------------------------------------------------------------------- |
| ## |
| ## Copyright 2001-2008 H. Peter Anvin - All Rights Reserved |
| ## |
| ## This program is free software; you can redistribute it and/or modify |
| ## it under the terms of the GNU General Public License as published by |
| ## the Free Software Foundation, Inc., 53 Temple Place Ste 330, |
| ## Boston MA 02111-1307, USA; either version 2 of the License, or |
| ## (at your option) any later version; incorporated herein by reference. |
| ## |
| ## ----------------------------------------------------------------------- |
| |
| ## |
| ## lss16toppm: |
| ## Convert an LSS-16 image to PPM |
| ## |
| ## Usage: |
| ## |
| ## lss16toppm [-map] < file.lss > file.ppm |
| ## |
| ## The -map causes the color map to be output on stderr. |
| ## |
| |
| eval { use bytes; }; |
| eval { binmode STDIN; }; |
| eval { binmode STDOUT; }; |
| |
| $map = 0; |
| foreach $arg ( @ARGV ) { |
| if ( $arg eq '-map' ) { |
| $map = 1; |
| } else { |
| print STDERR "$0: Unknown option: $arg\n"; |
| exit 127; |
| } |
| } |
| |
| if ( read(STDIN, $header, 56) != 56 ) { |
| print STDERR "$0: Short file\n"; |
| exit 1; |
| } |
| |
| ($magic, $xsize, $ysize, @colorset) = unpack("Vvvc48", $header); |
| |
| if ( $magic != 0x1413f33d ) { |
| print STDERR "$0: Invalid file format\n"; |
| exit 1; |
| } |
| |
| %color = (); |
| for ( $i = 0 ; $i < 16 ; $i++ ) { |
| $r = int((shift @colorset) * 255 / 63 + 0.5); |
| $g = int((shift @colorset) * 255 / 63 + 0.5); |
| $b = int((shift @colorset) * 255 / 63 + 0.5); |
| |
| $color{$i} = pack("ccc", $r, $g, $b); |
| |
| if ( $map ) { |
| printf STDERR "#%02x%02x%02x=%d\n", $r, $g, $b, $i; |
| } |
| } |
| |
| sub get_nybble() { |
| my($ch,$n); |
| if ( defined($nybble_buf) ) { |
| $n = $nybble_buf; |
| undef $nybble_buf; |
| } else { |
| if ( read(STDIN, $ch, 1) != 1 ) { |
| print STDERR "$0: Short read on input (file corrupt)\n"; |
| exit 1; |
| } |
| $ch = ord($ch); |
| $nybble_buf = $ch >> 4; |
| $n = $ch & 0xF; |
| } |
| return $n; |
| } |
| |
| print "P6\n"; |
| print "$xsize $ysize\n"; |
| print "255\n"; |
| |
| for ( $y = 0 ; $y < $ysize ; $y++ ) { |
| $x = 0; |
| $last = 0; |
| undef $nybble_buf; # Nybble buffer starts clear on each line |
| while ( $x < $xsize ) { |
| $n = get_nybble(); |
| |
| if ( $n != $last ) { |
| print $color{$n}; |
| $last = $n; |
| $x++; |
| } else { |
| $c = get_nybble(); |
| if ( $c == 0 ) { |
| # Double-nybble run |
| $c = get_nybble(); |
| $c += get_nybble() << 4; |
| $c += 16; |
| } |
| # Truncate overlong runs |
| $c = $xsize-$x if ( $c > $xsize-$x ); |
| # Output run |
| print $color{$n} x $c; |
| $x += $c; |
| } |
| } |
| } |