The Xlib drawing primitives I can see all take int arguments for x, y positions, e.g
Qt Code: 
  1. int XDrawLine(Display *display, Drawable d, GC gc, int x1, int y1, int x2, int y2);
  2.        int XMoveResizeWindow(Display *display, Window w, int x, int y, unsigned width, unsigned height);
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and Qt takes ints for these sorts of values too:
Qt Code: 
  1. const QRect QDesktopWidget::availableGeometry ( int screen = -1 ) const  // QRect is defined with ints
  2. void	QWidget::move ( int x, int y )
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Int is 32-bits on any modern machine, but since Exceed has been around a very long time it is possible they are hamstrung by a 16-bit int.