XmGetColorCalculation  —  A  function  to  get  the  procedure used for
       default color calculation
       #include <Xm/Xm.h>
       XmColorProc XmGetColorCalculation(void)
       XmGetColorCalculation returns the procedure  being  used  to  calculate
       default colors.
       For a description of XmColorProc, see XmSetColorCalculation(3).
       Returns the procedure used for default color calculation.
       XmChangeColor(3), XmGetColors(3), and XmSetColorCalculation(3).
                                           XmGetColorCalculation(library call)