XcupGetReservedColormapEntries - list colormap entries reserved by the system

cc [ flag ... ] file ... -lXext [ library ... ]
#include <X11/extensions/Xcup.h>
Status XcupGetReservedColormapEntries(Display *display,
int screen, XColor **colors_out, int *ncolors);

Specifies the connection to the X server.
Screen number on the host server.
Returns the values reserved by the server.
Returns the number of items in colors_out.

The XcupGetReservedColormapEntries function returns a list of colormap entries (pixels) that are reserved by the system. This list will, at a minimum, contain entries for the BlackPixel and WhitePixel of the specified screen. Use XFree to free colors_out.

To minimize colormap flash, an application which installs its own private colormap should query the special colors by calling XCupGetReservedColormapEntries, and can then store those entries (in the proper location) in its private colormap using XCupStoreColors.

XcupQueryVersion(3Xext), XcupStoreColors(3Xext), XFree(3X11),
Colormap Utilization Policy and Extension

libXext 1.3.6 X Version 11