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#define GET_INFO_DISPLAY(d)				    \
    ((InfoDisplay *) (d)->base.privates[displayPrivateIndex].ptr)

#define INFO_DISPLAY(d)			  \
    InfoDisplay *id = GET_INFO_DISPLAY (d)

#define GET_INFO_SCREEN(s, id)					\
    ((InfoScreen *) (s)->base.privates[(id)->screenPrivateIndex].ptr)

#define INFO_SCREEN(s)						       \
    InfoScreen *is = GET_INFO_SCREEN (s, GET_INFO_DISPLAY (s->display))