FcFreeTypeCharSetAndSpacing - compute Unicode coverage and spacing
type
#include <fontconfig.h>
#include <fcfreetype.h>
FcCharSet * FcFreeTypeCharSetAndSpacing (FT_Face face, FcBlanks *blanks, int *spacing);
Scans a FreeType face and returns the set of encoded Unicode
chars. FcBlanks is deprecated, blanks is ignored and accepted only
for compatibility with older code. spacing receives the computed
spacing type of the font, one of FC_MONO for a font where all glyphs have
the same width, FC_DUAL, where the font has glyphs in precisely two widths,
one twice as wide as the other, or FC_PROPORTIONAL where the font has glyphs
of many widths.