gtk:render-background-clip (context x y width height)

context -- a gtk:style-context object
x -- a number coerced to a double float for the x origin of the render area
y -- a number coerced to a double float for the y origin of the render area
width -- a number coerced to a double float for a rectangle width
height -- a number coerced to a double float for a rectangle height

The gdk:rectangle instance.

Returns the area that will be affected, that is, drawn to, when calling the gtk:render-background function for the given context and rectangle.