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#!/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;
}
}
}
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