Context.getFontFace

the current font face. This object is owned by cairo. To keep a reference to it, you must call cairo_font_face_reference(). This function never returns NULL. If memory cannot be allocated, a special "nil" cairo_font_face_t object will be returned on which cairo_font_face_status() returns CAIRO_STATUS_NO_MEMORY. Using this nil object will cause its error state to propagate to other objects it is passed to, (for example, calling cairo_set_font_face() with a nil font will trigger an error that will shutdown the cairo_t object).