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.