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#!/bin/sh
case $# in
3)
;;
*)
echo "Usage: $0 <input.svg> <size> <output.png>" 1>&2
exit 1
;;
esac
SVG=$1
SIZE=$2
PNG=$3
SHADOW=$(($SIZE / 16))
IMAGE=$(($SIZE - $SHADOW))
OPACITY=80
BLUR=$(($SHADOW / 4))
SHIFT=$(($SHADOW - $BLUR))
TMP=image-$$.png
trap "rm $TMP" 0 1 15
rsvg-convert -w $IMAGE -h $IMAGE -o $TMP $SVG
convert $TMP \
\( +clone -background black -shadow ${OPACITY}x${BLUR}+${SHIFT}+${SHIFT} \) \
+swap -background none -layers merge -crop ${SIZE}x${SIZE}+0+0 +repage $PNG
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