FcFreeTypeCharIndex − map Unicode to glyph id
FT_UInt FcFreeTypeCharIndex (FT_Face face, FcChar32 ucs4);
Maps a Unicode char to a glyph index. This function uses information from several possible underlying encoding tables to work around broken fonts. As a result, this function isn’t designed to be used in performance sensitive areas; results from this function are intended to be cached by higher level functions.