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#!/bin/bash
usage() {
echo "Usage: hqx [-s scaleBy] input output"
exit 1
}
scale=4
while getopts ":s:" option; do
case $option in
s)
scale="$OPTARG"
if [ "$scale" -ne 2 ] && [ "$scale" -ne 3 ] && [ "$scale" -ne 4 ]; then
echo "Only scale factors of 2, 3 and 4 are supported"
exit 1
fi
;;
\?)
echo "Invalid option: -$OPTARG" >&2
;;
:)
echo "hqx: option requires an argument -- '$OPTARG'"
usage
;;
esac
done
shift $((OPTIND-1))
inputfile="$1"
outputfile="$2"
if [ -z "$inputfile" ] || [ -z "$outputfile" ]; then
usage
fi
filetype="$(identify -format "%m" "$inputfile" 2>&1)"
input_exists="$?"
if ! [ -s "$inputfile" ] || [ $input_exists -ne 0 ]; then
echo "ERROR: can't load '$inputfile'"
exit 1
fi
if ! [ "$filetype" = "PNG" ]; then
convert "$inputfile" "._temp_png.png"
inputfile="._temp_png.png"
fi
pixelscale "$inputfile" "$outputfile" "hq${scale}x"
if [ -e "._temp_png.png" ]; then
rm "._temp_png.png"
fi
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