public unowned PaintVolume? get_transformed_paint_volume (Actor relative_to_ancestor)
) and it additionally transforms the paint volume into the coordinate space of
relative_to_ancestor. (Or the stage if
is passed for
This can be used by containers that base their paint volume on the volume of their children. Such containers can query the transformed paint volume of all of its children and union them together using union.
A Actor that is an ancestor of this (or
a pointer to a PaintVolume, or