cairo/canvas.go
func (v *Context) SetAntialias(antialias Antialias) {
	C.cairo_set_antialias(v.native(), C.cairo_antialias_t(antialias))
}
func (v *Context) SetAntialias(antialias Antialias) {
	C.cairo_set_antialias(v.native(), C.cairo_antialias_t(antialias))
}
// TODO(jrick) GetSource (depends on Pattern)
// SetAntialias is a wrapper around cairo_set_antialias().