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