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#!/bin/sh
#
# pcdovtoppm - generate a single PPM file from a PCD overview file
#
# Based on pnmindex (PBMPLUS), which was written by Jef Poskanzer,
# this script makes also use of hpcdtoppm, written by Hadmut Danisch.
#
# Formerly called Pcdindex.
#
# A similar result can be achieved by using "hpcdtoppm -Overview"
# followed by "pnmindex -black" on the generated PPM images.
# This shell just makes it more convenient and transparent to
# convert from one PCD to one PPM overview file.
#
# Additional options (compared to pnmindex) are -maxwidth and
# -font <font>. See "man pbmtext" on how to create your own font.
#
# Pieter S. van der Meulen, 1992.
# Rewritten in sh by Steve McIntyre <93sam@debian.org>, 2001

# You may want to change the default values in the next 6 lines:
maxwidth=1152   # maximum width of the index image
size=192                # make the images about this big
across=6                # show this many images per row
colors="noquant"        # maximum amount of colors or noquant (no quantization)
back="-black"   # default background color
font=" "                # default font or none (pbmtext's internal font)

usage ()
{
    echo "Usage: $0 [-m W] [-s S] [-a A] [-c N|n] [-f F] [-b|-w] <overview.pcd>"
    echo " with"
    echo "      W = maximum width of the result image   (default: $maxwidth)"
    echo "      S = maximum size of each of the images  (default: $size)"
    echo "      A = maximum number of images across     (default: $across)"
    echo "      N = maximum number of colors or noquant (default: $colors)"
    echo -n "   F = font to be used for annotation      (default: "
    if [ "$font" = " " ] ; then
                echo "internal font)"
    else
                echo "$font)"
    fi
    echo "      -b/-w = black/white background color    (default: $back)"
    echo " "
    echo " e.g.: $0 -m 768 -s 96 -f smallfont.pbm overview.pcd > overview.ppm"
    echo " or  : $0 /cdrom/photo_cd/overview.pcd | ppmtojpeg > overview.jpg"
    exit 1
}

# Parse the options
while :; do
    case "$1" in 
        -m*)
             if [ $# -lt 2 ] ; then usage; fi
             maxwidth="$2"
             shift
             shift
             ;;

-s*)
             if [ $# -lt 2 ] ; then usage; fi
             size="$2"
             shift
             shift
             ;;

-a*)
                if [ $# -lt 2 ] ; then usage; fi
                across="$2"
                shift
                shift
                ;;

-c*)
                if [ $# -lt 2 ] ; then usage; fi
                colors="$2"
                shift
                shift
                ;;

-f*)
                if [ $# -lt 2 ] ; then usage; fi
                font="-font $2"
                shift
                shift
                ;;

-b*)
                back="-black"
                shift
                ;;

-w*)
                back="-white"
                shift
                ;;

-*)
                echo "$0 : Unknown option $1"
                echo " "
                usage
                ;;

*)
                break
                ;;

esac
done

if [ $# = 0 ]; then
    usage
fi

tmpfile=`tempfile -p pi -m 600`

rowfiles=()
imagefiles=()
row=1
col=1
width=$size

# Convert the PCD overview file to many PPM images
if [ -f $1 ] ; then
    hpcdtoppm -Overview $1 $tmpfile
else
    echo "$0 : Could not access $1"
    echo " "
    usage
fi

for i in "$tmpfile"* 
do
    if [ -f $i ] ; then
        description=`pnmfile $i`
        if [ "${description[4]}" -le $size -a \
             "${description[6]}" -le $size ] ; then
            cat $i > $tmpfile
                else
            if [ "$colors" = "n" ] ; then
                pnmscale -quiet -xysize $size $size $i > $tmpfile
            else
                pnmscale -quiet -xysize $size $size $i | \
                ppmquant -quiet $colors > $tmpfile
            fi
        fi
    fi
    imagefile=pi.${row}.${col}.$$
    rm -f $imagefile
    ttext="$i:t"

rm -f $tmpfile
    description=`pnmfile $imagefile`
    width=$(( $width + ${description[4]} ))
    imagefiles="$imagefiles $imagefile"

if [ $col -ge $across -o $width -gt $maxwidth ] ; then
        rowfile=pi.${row}.$$
        rm -f $rowfile
    if [ "$colors" = "n" ] ; then
        pnmcat $back -lr -jbottom $imagefiles > $rowfile
    else
        pnmcat $back -lr -jbottom $imagefiles | \
        ppmquant -quiet $colors > $rowfile
    fi
    rm -f $imagefiles
    imagefiles=()
    rowfiles="$rowfiles $rowfile"
    col=1
    row=$(( $row + 1 ))
    width=$size
    else
        col=$(( $col + 1 ))
    fi
done

if [ ${#imagefiles[*]} -gt 0 ] ; then
    rowfile=pi.${row}.$$
    rm -f $rowfile
    if [ "$colors" = "n" ] ; then
        pnmcat $back -lr -jbottom $imagefiles > $rowfile
    else
        pnmcat $back -lr -jbottom $imagefiles | \
        ppmquant -quiet $colors > $rowfile
    fi
    rm -f $imagefiles
    rowfiles="$rowfiles $rowfile"
fi

if [ ${#rowfiles[*]} = 1 ]; then
    cat $rowfiles
else
    if [ "$colors" = "n" ] ; then
        pnmcat $back -tb $rowfiles
    else
        pnmcat $back -tb $rowfiles | ppmquant -quiet $colors
    fi
fi

rm -f $rowfiles

exit 0