gtk/print.go
func (ps *PrintSettings) SetPrinterLpi(lpi float64) {
	C.gtk_print_settings_set_printer_lpi(ps.native(), C.gdouble(lpi))
}
func (ps *PrintSettings) SetPrinterLpi(lpi float64) {
	C.gtk_print_settings_set_printer_lpi(ps.native(), C.gdouble(lpi))
}
// SetPrinterLpi() is a wrapper around gtk_print_settings_set_printer_lpi().