diff -r 1d03dc1173cd -r 08dc62e03a6d src/colors.h
--- a/src/colors.h	Sun Feb 02 00:49:32 2020 +0200
+++ b/src/colors.h	Sun Feb 02 00:50:57 2020 +0200
@@ -90,3 +90,5 @@
 	static constexpr Color mainColor {16};
 	static constexpr Color edgeColor {24};
 }
+
+double luma(const QColor& color);