Codechange: reduce code duplication

src/fontcache.h

@@ -218,6 +218,22 @@ struct FontCacheSettings {
 
 extern FontCacheSettings _fcsettings;
 
+/**
+ * Get the settings of a given font size.
+ * @param fs The font size to look up.
+ * @return The settings.
+ */
+static inline FontCacheSubSetting *GetFontCacheSubSetting(FontSize fs)
+{
+	switch (fs) {
+		default: NOT_REACHED();
+		case FS_SMALL:  return &_fcsettings.small;
+		case FS_NORMAL: return &_fcsettings.medium;
+		case FS_LARGE:  return &_fcsettings.large;
+		case FS_MONO:   return &_fcsettings.mono;
+	}
+}
+
 void InitFontCache(bool monospace);
 void UninitFontCache();
 bool HasAntialiasedFonts();