requireGlyphs

All BitmapFonts created will pre-render glyphs for these characters. The default is the range 32..255, plus some currency symbols and other characters outside this range.

If characters outside the default range are used, then font-metrics may be wrong and the characters will not be rendered. However, Glok will rebuild the font, so that subsequent use of the font will work correctly.

If you know your application will use glyphs outside the default range, then adding them early, will improve performance (as the fonts won't need to be rebuilt on-the-fly).