Merge pull request 'Add Mineclonia menu icon' (#139) from add-mineclonia-menu-icon into master

Reviewed-on: https://git.minetest.land/Mineclonia/Mineclonia/pulls/139
Reviewed-by: cora <cora@noreply.git.minetest.land>

menu/icon.png.do

@@ -0,0 +1,29 @@
+#!/bin/sh
+set -eu
+
+SVG_FILE=${2%.png}.svg
+
+# How crisp a Minetest menu icon appears is influenced by image height
+# and width. Low resolutions lead to blurry edges, as Minetest scales
+# menu icons up. High resolutions lead to jagged edges, as Minetest
+# scales menu icons down. Height & width of 72 pixes seem to work.
+#
+# Though usually one would export directly to "${3}", Inkscape 1.0 had
+# its command line options changed by people who apparently think that
+# backwards compatibility is some kind of swear word: Whereas earlier
+# Inkscape versions would export to a file called foo.png.tmp, newer
+# behaviour is to ignore the user's wishes & write to foo.png.png –
+# unless one asks it to write to a filename with a .png extension,
+# Inkscape 1.0 changes the filename extension to .png each time.
+#
+# As we do not know the extension of "${3}", we have to use the
+# extension, then rename the resulting file to the proper name;
+# only that way the export works with Inkscape 1.0 & earlier …
+>&2 inkscape \
+	--file="${SVG_FILE}" \
+	--export-png="${3}".png \
+	--export-area-page \
+	--export-height 72 \
+	--export-width 72 \
+
+mv "${3}".png "${3}"