code: func (v *Surface) GetDeviceOffset() (x, y float64) {
  	var xOffset, yOffset C.double
  	C.cairo_surface_get_device_offset(v.native(), &xOffset, &yOffset)
  	return float64(xOffset), float64(yOffset)
  }
docs: // GetDeviceOffset is a wrapper around cairo_surface_get_device_offset().