#!/bin/sh

#/////////////// Description ////////////////////////////
#
#pstogif : convert *.ps file to *.gif
#
# input  : first parameter
# output : stdout
#
# reference : http://www.dais.is.tohoku.ac.jp/~kabe/misc/tips.html
#
# requires : ghostscript (gs)
#            ppm file support (pnmdepth, ppmtogif)
#

#////////////////Update Logs/////////////////////////////
#
#      ver.0.01 by AGATASHI  20000426
#              :original version
#            02              ditto
#              :pnmdepth -> ppmquant
#            03              ditto
#              :gs option changed. -sDEVICE=ppm -> -sDEVICE=ppmraw
#
#          0.10 by AGATASHi  20010516
#              :--transparent option
#            11 by AGATASHI  20010606
#              : --dpi option
#            12 by AGATASHI  20010607
#              : --rotate option
#          0.20 by AGATASHI  20010607
#              : All options now not need "="
#            21 by AGATASHI  20010618
#              : Minor bug fixes
#            22 by AGATASHI  20010623
#              : Change of usage system
#              : Dynamic specification of size of working field
#              : --margin option#
#            23 by AGATASHI  20010624
#              : --detail_ratio option
#            24 by AGATASHI 20010624
#              : --usage and --help option
#///////////////  Version Number /////////////////////////////
#
VERSION_MAJOR="0"
VERSION_MINOR="24"
#


#//////////////// Default Values /////////////////////////////
#

DETAIL_DEFAULT=2.0
MARGIN_DEFAULT=10
DPI_DEFAULT=100
ROTATE_DEFAULT=0
X_SIZE_INCH_DEFAULT=12
Y_SIZE_INCH_DEFAULT=12


#//////////////// Usage /////////////////////////////
#

usage(){

cat <<EOM

Usage:
$COMNAME [options...] psfile giffile

Description:
$COMNAME converts a *.ps file into one GIF image file.
Current Version is ${VERSION_MAJOR}.${VERSION_MINOR}

Options :
--detail_ratio          [default = ${DETAIL_DEFAULT}]
--dpi pix_per_inch      [default = ${DPI_DEFAULT}]
--margin margin_width   [default = ${MARGIN_DEFAULT}]
--rotate angle          [default = ${ROTATE_DEFAULT} (counterclockwise in deg)]
--transparent colorname [default no transparent color set]

--usage | --help : show this message

EOM
}

#
#//////////////// Main Body /////////////////////////////
#

COMNAME=`basename $0`

if [ $# -lt 2 ] ; then
        usage
        exit 1
fi

#////////////////////////////////////////////
#
# Command Line Options
#
#

TRANSPARENT_OPTION=""
DPI=$DPI_DEFAULT
DETAIL_RATIO=$DETAIL_DEFAULT
MARGIN_WIDTH=$MARGIN_DEFAULT
ROTATE_ANGLE=$ROTATE_DEFAULT
X_SIZE_INCH=$X_SIZE_INCH_DEFAULT
Y_SIZE_INCH=$Y_SIZE_INCH_DEFAULT

  while [ $# -gt 0 ] ; do
    echo "Q$2" | grep '^Q--' > /dev/null
    test $? -ne 0 -a $# -gt 1           # process this option?

    case $1 in

      --help|--usage)
        usage; exit
        ;;

      --transparent)
        if [ $? -eq 0 ] ; then TRANSPARENT_OPTION=" -transparent $2" ; shift ;
fi
        shift;
        ;;

       --dpi)
        if [ $? -eq 0 ] ; then  DPI=$2; shift ;fi
        shift;
        ;;

       --rotate)
        if [ $? -eq 0 ] ; then  ROTATE_ANGLE=$2; shift ;fi
        shift;
        ;;

       --margin)
        if [ $? -eq 0 ] ; then  MARGIN_WIDTH=$2; shift ;fi
        shift;
        ;;

       --detail_ratio)
        if [ $? -eq 0 ] ; then  DETAIL_RATIO=$2; shift ;fi
        shift;
        ;;

       --*)
        echo "Unrecognized option : $1"
        usage
        exit
        ;;

      *)
        break;
        ;;

    esac
  done

  if [ $# -ne 2 ] ; then
        usage
        exit
  fi


#////////////////////////////////////////////
#
# GO
#
#

if [ -f "$1" ] ; then

          #file names

        PS_FILE=$1
        GIF_FILE=$2

          #details (working field dpi setting)

        REDUCTION_RATIO=`echo $DETAIL_RATIO | awk '{printf("%.3f", 1 / $1) }'`

          #dpi of working field

        WORK_DPI=`echo $DETAIL_RATIO $DPI | awk '{printf("%d", $1 * $2) }'`

          #size of working field in pixels

        PIX_X_SIZE=`echo $WORK_DPI $X_SIZE_INCH | awk '{printf("%d", $1 * $2) }
'`
        PIX_Y_SIZE=`echo $WORK_DPI $Y_SIZE_INCH | awk '{printf("%d", $1 * $2) }
'`

    # Execute...

        echo "----------- $COMNAME version ${VERSION_MAJOR}.${VERSION_MINOR} --
---------"
        echo "  Source : $PS_FILE ,  Target : $GIF_FILE "

        rm -f $GIF_FILE

        if [ $ROTATE_ANGLE -ne 0 ] ; then
                ROTATE_COMMAND="pnmrotate $ROTATE_ANGLE"
        else
                ROTATE_COMMAND="cat"
        fi

        if [ $MARGIN_WIDTH -ne 0 ] ; then
                MARGIN_COMMAND="pnmmargin -white $MARGIN_WIDTH"
        else
                MARGIN_COMMAND="cat"
        fi

        #
        # ps --> pnm(ppm) --> gif
        # TODO: size information will be got from PS file itself
        #

        gs -sDEVICE=ppmraw \
            -sOutputFile=- \
            -g${PIX_X_SIZE}x${PIX_Y_SIZE} \
            -r${WORK_DPI} \
            -q -dNOPAUSE ${PS_FILE}  < /dev/null  | \
          pnmscale $REDUCTION_RATIO | \
          pnmcrop -white  | \
          ${ROTATE_COMMAND} | \
          ${MARGIN_COMMAND} | \
          ppmquant 256 | \
          ppmtogif -interlace $TRANSPARENT_OPTION - \
          > $GIF_FILE

else
        echo Fatal Error : $COMNAME : FILE \"$1\" Not Found
        exit 1
fi

#
# EOF
#
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