cairo-pattern-set-extend (pattern extend)

pattern -- a cairo-pattern-t instance
extend -- a value of the cairo-extend-t enumeration describing how the area outside of the pattern will be drawn

Sets the mode to be used for drawing outside the area of a pattern. See the cairo-extend-t enumeration for details on the semantics of each extend strategy.

The default extend mode is :none for surface patterns and :pad for gradient patterns.