icon: Create all icons from .svg files

[fw/altos] / icon / make-png

diff --git a/icon/make-png b/icon/make-png
new file mode 100755 (executable)
index 0000000..748cf32
--- /dev/null
+++ b/icon/make-png
@@ -0,0 +1,34 @@
+#!/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))
+
+echo SHADOW $SHADOW IMAGE $IMAGE OPACITY $OPACITY SHIFT $SHIFT BLUR $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
+