XmSetColorCalculation

Motif 2.1 Programmer's Reference

XmSetColorCalculation

A function to set the procedure used for default color calculation

Format

#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).