#!/bin/sh
##
## ppmimgvquant.sh
##	Simple palette mangler for image viewer pgm files.
##
## Copyright (C) 1997 Eric A. Howe
##
## 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., 675 Mass Ave, Cambridge, MA 02139, USA.
##
##   Authors:  Eric A. Howe (mu@trends.net)
##
## $Mu: imgvtopgm/ppmimgvquant.in 1.2 1999/05/09 07:56:09 $
##
MAPFILE=/tmp/$$.ppmimgvquant.$$

cleanup() {
	[ -r $MAPFILE ] && rm -f $MAPFILE
}

trap cleanup 2 3 9 13 15 

usage() {
	NAME=`basename $1`
	echo "$NAME [-hv] [ppmquant options]"
	cat <<_DONE_DONE_DONE_
	Convert the palette of a PPM image to the standard Image Viewer
	palette. All options except -h and -v are passed to ppmquant(1).

	-4	Convert to 4 depth image (for Palm IIIx/V).
	-h	Display this usage message and exit.
	-v	Display the version number and exit.
_DONE_DONE_DONE_
}

version() {
	NAME=`basename $1`
	echo "$NAME @VERSION@"
}

GRAY16="no"
DONE="no"
while [ $DONE != "yes" ]; do
	case X"$1" in
	X"-h")	usage $0;	exit 0	;;
	X"-v")	version $0;	exit 0	;;
	X"-4")	GRAY16="yes";	shift	;;
	X*)	DONE="yes"		;;
	esac
done

if [ $GRAY16 = "yes" ]; then
cat > $MAPFILE <<_DONE_DONE_DONE_
P3
16 1
255
  0   0   0
 17  17  17
 34  34  34
 51  51  51
 68  68  68
 85  85  85
102 102 102
119 119 119
136 136 136
153 153 153
170 170 170
187 187 187
204 204 204
221 221 221
238 238 238
255 255 255
_DONE_DONE_DONE_
else
cat > $MAPFILE <<_DONE_DONE_DONE_
P3
4 1
255
  0   0   0
 85  85  85
170 170 170
255 255 255
_DONE_DONE_DONE_
fi

ppmquant -map $MAPFILE "$@" | ppmtopgm
cleanup