Called by Efl.Canvas.Filter.Internal to request the parent class for state information (color, etc...).
Overridden from Efl.Canvas.Filter.Internal.filter_state_prepare.
filter_state_prepare @protected @pure_virtual { params { @out state: Efl.Canvas.Filter.State; @in data: void_ptr; } }
void evas_filter_state_prepare(Eo *obj, Efl_Canvas_Filter_State *state, void *data);