(cffi:defcenum pattern-type-t
  :solid
  :surface
  :linear
  :radial
  :mesh
  :raster-source)  

The cairo:pattern-type-t enumeration is used to describe the type of a given pattern. The type of a pattern is determined by the function used to create it. The cairo:pattern-create-rgb and cairo:pattern-create-rgba functions create :solid patterns. The remaining cairo:pattern-create-type functions map to pattern types in obvious ways. The pattern type can be queried with the cairo:pattern-type function.

Most Cairo pattern functions can be called with a pattern of any type, though trying to change the extend or filter for a solid pattern will have no effect. A notable exception are the cairo:pattern-add-color-stop-rgb and cairo:pattern-add-color-stop-rgba functions which must only be called with gradient patterns, either :linear or :radial. Otherwise the pattern will be shutdown and put into an error state.