Surface.setDeviceOffset

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_translate() isn't sufficient to do this, since functions like Device.toUser will expose the hidden offset. Note that the offset affects drawing to the surface as well as using the surface in a source pattern. Since 1.0

class Surface
void
setDeviceOffset
(
double xOffset
,
double yOffset
)

Parameters

xOffset double

the offset in the X direction, in device units

yOffset double

the offset in the Y direction, in device units