gtk:print-context-set-cairo-context (context cr xdpi ydpi)

context -- a gtk:print-context object
cr -- a cairo:context-t instance with the Cairo context
xdpi -- a number coerced to a double float with the horizontal resolution to use with cr
ydpi -- a number coerced to a double float with the vertical resolution to use with cr

Sets a new Cairo context on a print context. This function is intended to be used when implementing an internal print preview, it is not needed for printing, since GTK itself creates a suitable Cairo context in that case.