code: func CairoCreateLayout(cr *cairo.Context) *Layout {
  	c := C.pango_cairo_create_layout(cairo_context(cr))
  	layout := new(Layout)
  	layout.pangoLayout = (*C.PangoLayout)(c)
  	return layout
  }
docs: //PangoLayout *pango_cairo_create_layout (cairo_t     *cr);