Gives the face name of the font. This may be returned by an ITextSource implementation.
- the face name of the font locks the face if the XftGrFont object was constructed from an XftFont object. unlockFace() must be called to release the face. This is public so that SegmentPainters can access it if necessary. Only 1 lock should be in place at any one time.
FT_Face a locked face handle