Creates a gsk.render_node.RenderNode that will render an outset shadow around the box given by outline.
outline of the region surrounded by shadow
color of the shadow
horizontal offset of shadow
vertical offset of shadow
how far the shadow spreads towards the inside
how much blur to apply to the shadow
A new gsk.render_node.RenderNode
Creates a gsk.render_node.RenderNode that will render an outset shadow around the box given by outline.