code: func (pc *PrintContext) SetCairoContext(cr *cairo.Context, dpiX, dpiY float64) {
  	C.gtk_print_context_set_cairo_context(pc.native(),
  		(*C.cairo_t)(unsafe.Pointer(cr.Native())),
  		C.double(dpiX), C.double(dpiY))
  }
docs: // SetCairoContext() is a wrapper around gtk_print_context_set_cairo_context().