#!/bin/ksh
Usage() {
printf 'Usage: %s [-p] [-n] [-h] [image_dir]
Options:
-p .. Combine straight to PNG. Otherwise first pics are combined into a
GIF and than converted to PNG.
-n .. No action, i.e. show what would be done without actually doing it.
-h .. Print this help and exit.
Combines several images into a sprite named combined.png and prints out
the required CSS infos. E.g.:
%s web/static/offwhite/img
' "$(basename $0)" "$(basename $0)"
}
GIF="gif"
ECHO=""
while getopts "h(help)n(dry)p(png)" option ; do
case "$option" in
h) Usage ; exit 0 ;;
p) GIF="png" ;;
n) ECHO="echo" ;;
esac
done
IDX=$(($OPTIND-1))
shift $IDX
if [ -n "$1" ]; then
cd "$1"
[ $? -eq 0 ] || exit 1
fi
F_NAV="h.gif l.gif w.gif a.gif lno.gif slst.gif"
F_LST="do.gif d.gif p.gif"
F_MISC="Logo.png servedby.png rss.png btn_close.gif q.gif" # q.gif must be the last
FILES="$F_MISC $F_LST $F_NAV"
FILES="$F_NAV $F_LST $F_MISC"
OUT="combined"
# concat to GIF (results in smaller pics than to PNG directly)
$ECHO montage -background Transparent -tile x1 -mode Concatenate $FILES ${OUT}.$GIF
if [ "$GIF" = "gif" ]; then
# convert to PNG (transparent gifs are rendered badly by FF on none-transparent
# BGs. Converting it manually e.g. with Gimp may produce better results.)
$ECHO convert ${OUT}.$GIF ${OUT}.png
fi
integer X=0
[ -n "$ECHO" ] && $ECHO "identify -format '%f %w %h\\\n' $FILES $OUT.png"
identify -format "%f %w %h\n" $FILES $OUT.png | while read F W H T; do
[ -z "$F" ] && continue
printf "%s background-position: -%dpx %dpx; width: %dpx; height: %dpx;\n" \
"$F" $X 0 $W $H
X=$((X+$W))
done