public static extern IntPtr XcmsCreateCCC(IntPtr display, int screen_number, IntPtr visual, ref XcmsColor client_white_point, XcmsCompressionProc compression_proc, IntPtr compression_client_data, XcmsWhiteAdjustProc white_adjust_proc, IntPtr white_adjust_client_data);
public static extern XcmsWhiteAdjustProc XcmsSetWhiteAdjustProc(IntPtr ccc, XcmsWhiteAdjustProc white_adjust_proc, IntPtr client_data);