get_charset should return an FcCharSet * that includes complete
coverage information for your font. That might include coverage in
the usual unicode ranges, or in the PUA.
Ok, that should not be too hard -- as long as the application drawing
onto pango and the decoder use the same unicode mapping all should be
fine I guess. Maybe it's best to map all unknown characters in the
PUA, I'll see.
Yeah, that's what it's there for. :)