See include/vcl/devicecoordinate.hxx.

(But why do we use the vague 'long' and not sal_Int32? Note that
'long' is not necessarily any "longer" than 'int', so if we don't want
to use (the admittedly ugly-looking) 'sal_Int32', why not simply
'int'?)

Change-Id: I8d27b43b64eaed86dd95eb89866db8d5680cc60b