face = ccontext:GetFontFace()
This function returns the current font face. This object is owned by Cairo. To keep a reference to it, you must call cfontface:Reference().
This function never returns Nil. If memory cannot be allocated, a
special Nil font face object will be returned on which
cfontface: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
ccontext:SetFontFace() with a Nil font will trigger an error that
will shutdown the Cairo context object.