gsk:outset-shadow-node-new (outline color dx dy spread radius)

outline -- a gsk:rounded-rect instance with the outline of the region containing the shadow
color -- a gdk:rgba instance with the color of the shadow
dx -- a number coerced to a float with the horizontal offset of the shadow
dy -- a number coerced to a float with the vertical offset of the shadow
spread -- a number coerced to a float how far the shadow spreads towards the inside
radius -- a number coerced to a float how much blur to apply to the shadow

The gsk:outset-shadow-node instance.

Creates a render node that will render an outset shadow into the box given by outline.