cairo-set-antialias (cr antialias)

cr -- a cairo-t context
antialias -- a cairo-antialias-t mode

Set the antialiasing mode of the rasterizer used for drawing shapes. This value is a hint, and a particular backend may or may not support a particular value. At the current time, no backend supports :subpixel when drawing shapes.

Note that this option does not affect text rendering, instead see the cairo-font-options-antialias function.