Interaction with Xlib

In many instances the application will need to use functions from the Xlib layer for graphics or pure flexibility. Most of the the Xlib procedures take as arguments the display, screen, window, or gc structures. Therefore proxt provides the predicates xtDisplay, xtScreen, xtWindow, xCreateGC and xtWindowToWidget to facilitate the mapping between Xt and Xlib. Also, the predicate xLoadQueryFont is provided to supply the font structure needed by Motif font predicates such as xmFontCreateList.