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