aboutsummaryrefslogtreecommitdiffstats
path: root/utils/lss16toppm
diff options
context:
space:
mode:
Diffstat (limited to 'utils/lss16toppm')
-rwxr-xr-xutils/lss16toppm111
1 files changed, 111 insertions, 0 deletions
diff --git a/utils/lss16toppm b/utils/lss16toppm
new file mode 100755
index 00000000..18b7f642
--- /dev/null
+++ b/utils/lss16toppm
@@ -0,0 +1,111 @@
+#!/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;
+ }
+ }
+}