XcmsSetWhitePoint, XcmsSetWhiteAdjustProc - modifying CCC attributes
Status XcmsSetWhitePoint(XcmsCCC ccc, XcmsColor
    *color);
XcmsWhiteAdjustProc XcmsSetWhiteAdjustProc(XcmsCCC ccc,
    XcmsWhiteAdjustProc white_adjust_proc, XPointer
  client_data);
  - ccc
- Specifies the CCC.
- client_data
- Specifies client data for the white point adjustment procedure or
    NULL.
- color
- Specifies the new Client White Point.
- white_adjust_proc
- Specifies the white point adjustment procedure.
The XcmsSetWhitePoint function changes the Client White Point in the
  specified CCC. Note that the pixel member is ignored and that the color
  specification is left unchanged upon return. The format for the new white
  point must be XcmsCIEXYZFormat, XcmsCIEuvYFormat,
  XcmsCIExyYFormat, or XcmsUndefinedFormat. If the color argument
  is NULL, this function sets the format component of the Client White Point
  specification to XcmsUndefinedFormat, indicating that the Client White
  Point is assumed to be the same as the Screen White Point.This function returns nonzero status if the format for the new
    white point is valid; otherwise, it returns zero.
The XcmsSetWhiteAdjustProc function first sets the white
    point adjustment procedure and client data in the specified CCC with the
    newly specified procedure and client data and then returns the old
    procedure.
DisplayOfCCC(3), XcmsCCCOfColormap(3), XcmsConvertColors(3), XcmsCreateCCC(3),
  XcmsDefaultCCC(3)
Xlib - C Language X Interface