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XmSetColorCalculation(3)

NAME

   XmSetColorCalculation  ---  A  function  to  set  the  procedure used for
   default color  calculation  "XmSetColorCalculation"  "Color  functions"
   "XmSetColorCalculation"

SYNOPSIS

   #include <Xm/Xm.h>
   XmColorProc XmSetColorCalculation(
   XmColorProc color_proc);

DESCRIPTION

   XmSetColorCalculation  sets  the procedure to calculate default colors.
   This procedure is used to calculate the foreground, top shadow,  bottom
   shadow, and select colors on the basis of a given background color.  If
   called with an argument of NULL, it restores the default procedure used
   to calculate colors.

   color_proc
             Specifies the procedure to use for color calculation.

   Following   is   a   description   of  the  XmColorProc  type  used  by
   XmSetColorCalculation:

   void (*color_proc) (background_color, foreground_color, select_color, top_shadow_color,
   bottom_shadow_color)
           XColor  *background_color;
           XColor  *foreground_color;
           XColor  *select_color;
           XColor  *top_shadow_color;
           XColor  *bottom_shadow_color;
   (void)

   Specifies  the  procedure  used  to  calculate  default  colors.    The
   procedure  is  passed a pointer to an XColor structure representing the
   background color.  The pixel, red, green,  and  blue  members  of  this
   structure  are  filled  in  with  values that are valid for the current
   colormap.

   The procedure is passed pointers to XColor structures representing  the
   foreground,  select,  top  shadow,  and  bottom  shadow  colors  to  be
   calculated.  The procedure calculates and fills in the red, green,  and
   blue  members  of  these structures.  The procedure should not allocate
   color cells for any of these colors.

   background_color
             Specifies the background color.

   foreground_color
             Specifies the foreground color to be calculated.

   select_color
             Specifies the select color to be calculated.

   top_shadow_color
             Specifies the top shadow color to be calculated.

   bottom_shadow_color
             Specifies the bottom shadow color to be calculated.

RETURN

   Returns the color calculation procedure that was used at the time  this
   routine was called.

RELATED

   XmChangeColor(3), XmGetColors(3), and XmGetColorCalculation(3).

                                                  XmSetColorCalculation(3)



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