cairo:region-intersect-rectangle (region x y width height)

region -- a cairo:region-t instance
x -- an integer for the x coordinate with the left side of the rectangle
y -- an integer for the y coordinate with the top side of the rectangle
width -- an integer for the width of the rectangle
height -- an integer for the height of the rectangle

The passed in cairo:region-t instance for the intersection or nil if an error occured.

Computes the intersection of region with the given rectangle and places the result in region.