Surface.setDeviceOffset

void setDeviceOffset(double xOffset, double yOffset)

Sets an offset that is added to the device coordinates determined by the CTM when drawing to surface. One use case for this function is when we want to create a #cairo_surface_t that redirects drawing for a portion of an onscreen surface to an offscreen surface in a way that is completely invisible to the user of the cairo API. Setting a transformation via [cairo.context.Context.translate] isn't sufficient to do this, since functions like [cairo.context.Context.deviceToUser] will expose the hidden offset.

Note that the offset affects drawing to the surface as well as using the surface in a source pattern.

Parameters

`xOffset`	the offset in the X direction, in device units
`yOffset`	the offset in the Y direction, in device units