#!/bin/bash
# Script for converting an png image to 8bit semitransparent files base-* and focus-* for using as menu items

if [ ! command -v convert >/dev/null 2>&1 ]; then
	>&2 echo "convert executable could not be found"
	exit 128
fi

if [ ! command -v pngquant >/dev/null 2>&1 ]; then
	>&2 echo "pngquant executable could not be found"
	exit 128
fi


if [ "$1" = "" ]; then
	>&2 echo "zadej filename"
	exit 1
fi

filename="$1"

convert "$filename" -channel A -evaluate Multiply 0.5 +channel -resize 64x64 "prefocus-$filename"
pngquant 256 < "prefocus-$filename" > "focus-$filename"

rm "prefocus-$filename"
convert "$filename" -channel A -evaluate Multiply 0.9 +channel -resize 48x48 "prebody-$filename"
pngquant 256 < "prebody-$filename" > "body-$filename"
rm "prebody-$filename"