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git://xwords.git.sourceforge.net/gitroot/xwords/xwords
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87 lines
2.3 KiB
Perl
Executable file
87 lines
2.3 KiB
Perl
Executable file
#!/usr/bin/perl
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#
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# Copyright 2001 by Eric House (xwords@eehouse.org). All rights reserved.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#
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#
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# Given a pbitm on stdin, a text bitmap file where '#' indicates a set
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# bit and '-' indicates a clear bit, convert into binary form (on
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# stdout) where there's one bit per bit plus a byte each for the width
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# and height. Nothing for bitdepth at this point. And no padding: if
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# the number of bits in a row isn't a multiple of 8 then one byte will
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# hold the last bits of one row and the first of another.
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use strict;
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my $nRows = 0;
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my $nCols = 0;
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my $bits = ""; # save the chars in a single string to start
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# first gather information and sanity-check the data
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while (<>) {
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chomp;
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my $len = length();
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if ( $nCols == 0 ) {
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$nCols = $len;
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} else {
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die "line of inconsistent length" if $nCols != $len ;
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}
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if ( $nCols == 0 ) {
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last;
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}
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$bits .= $_;
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++$nRows;
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}
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my $len = length($bits);
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print pack( "C", $nCols );
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# if we've been given an empty file, print out a single null byte and
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# be done. That'll be the convention for "non-existant bitmap".
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if ( $len == 0 ) {
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exit 0;
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}
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print pack( "C", $nRows );
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printf STDERR "emitting %dx%d bitmap\n", $nCols, $nRows;
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my @charlist = split( //,$bits);
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my $byte = 0;
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for ( my $count = 0; ; ++$count ) {
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my $ch = $charlist[$count];
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my $bitindex = $count % 8;
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$ch == '-' || $ch == '#' || die "unknown char $ch";
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my $bit = ($ch eq '#')? 1:0;
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$byte |= $bit << (7 - $bitindex);
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my $lastPass = $count + 1 == $len;
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if ( $bitindex == 7 || $lastPass ) {
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print pack( "C", $byte );
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if ( $lastPass ) {
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last;
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}
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$byte = 0;
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}
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} # for loop
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