update artwork

res/barrier.svg

@@ -1,38 +1,112 @@
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+
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+   xmlns:svg="http://www.w3.org/2000/svg"
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res/makeicon.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+if ! which magick >/dev/null 2>&1; then
+    echo "Need ImageMagic for this"
+    exit 10
+fi
+cd $(dirname $0) || exit $?
+if [ ! -r barrier.png ]; then
+    echo "Use inkscape (or another vector graphics editor) to create barrier.png from barrier.svg first"
+    exit 10
+fi
+rm -rf work || exit $?
+mkdir -p work || exit $?
+for s in 16 24 32 48 64 128; do
+    magick convert barrier.png -resize ${s}x${s} work/${s}.png || exit $?
+done
+magick convert work/{16,24,32,48,64,128}.png barrier.png barrier.ico || exit $?
+rm -rf work
+echo Done