FcFileScan - scan a font file
#include <fontconfig/fontconfig.h>
FcBool FcFileScan (FcFontSet *set, FcStrSet *dirs, FcFileCache *cache, FcBlanks *blanks, const FcChar8 *file, FcBool force);
Scans a single file and adds all fonts found to set. If force is
FcTrue, then the file is scanned even if associated information is found in
cache. If file is a directory, it is added to dirs.
Whether fonts are found depends on fontconfig policy as well as the current
configuration. Internally, fontconfig will ignore BDF and PCF fonts which are
not in Unicode (or the effectively equivalent ISO Latin-1) encoding as those
are not usable by Unicode-based applications. The configuration can ignore
fonts based on filename or contents of the font file itself. Returns FcFalse
if any of the fonts cannot be added (due to allocation failure). Otherwise
returns FcTrue.