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