cairo:antialias (cr)

cr -- a cairo:context-t instance
antialias -- a cairo:antialias-t value

The cairo:antialias function gets the current shape antialiasing mode of the rasterizer used for drawing shapes. The (setf cairo:antialias) function sets the antialiasing mode. This value is a hint, and a particular backend may or may not support a particular value. At the current time, no backend supports the :subpixel mode when drawing shapes. This option does not affect text rendering, instead see the cairo:font-options-antialias function.