FcFreeTypeCharIndex - map Unicode to glyph id
#include <fontconfig.h>
#include <fcfreetype.h>
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.