#! /bin/sh
# psrender -- cvt PostScript to ppm or Group3 bitmap
#
# This is a "helper" program which lives in /usr/fisher/mipslib
# and is not meant to be called directly.

PATH=/york/mips/bin:/bin:/usr/bin:
glog=/tmp/$$.glog
otemp=/tmp/$$.ppm

rc=0

trap "rm -f $glog $otemp; exit \$rc" 0

fail()
  { echo "psrender: $1" >&2
    rc=1; exit
  }

for sig in 1 2 3 13 15
do
  trap "fail \"Signal $sig!\"" $sig
done

xdpi=72
ydpi=72
dev=ppm

while :
do
    case "$1" in
	-dpi)
	    # resolution, dots per inch
	    xdpi="$2"; ydpi="$3"
	    shift; shift; shift;;

	-m)
	    # monochrome
	    dev=pbm
	    shift;;

	-g3)
	    # Group3 fax
	    dev=faxg3
	    shift;;

	-?*)
	    fail "bad option: $1";;

	*)
	    break;;
    esac
done

[ $# != 2 ] && fail "Usage: psrender [-dpi x y] [-m | -g3] in.ps out\n(either file can be -)"

# compute page size by multiplying A4 dimensions by dots per inch

mul() { echo "$1 $2 * 0.5 + 0 k 1 / p" | dc; }  # multiply, round to nearest integer

xsize=`mul $xdpi 8.2765`
ysize=`mul $ydpi 11.705`

# see /york/mips/bin/pstopdf
gs -q -dSAFER -dNOPAUSE -dBATCH -sDEVICE=$dev \
   -r${xdpi}x${ydpi} -g${xsize}x${ysize} -sOutputFile=$otemp \
   -c save pop -f "$1" -c quit >$glog

# see if there are any error msgs
read xxx <$glog &&
  { cat $glog >&2; echo >&2
    fail "GhostScript failed!"
  }

case "$2" in
    -)
	cat $otemp;;
    *)
	cp $otemp "$2";;
esac