-void mathed_char_dim(LyXFont const &, unsigned char c, Dimension & dim);
-int mathed_char_width(LyXFont const &, unsigned char c);
-int mathed_char_ascent(LyXFont const &, unsigned char c);
-int mathed_char_descent(LyXFont const &, unsigned char c);
+int mathed_char_width(Font const &, char_type c);
+
+int mathed_char_kerning(Font const &, char_type c);