Path: utzoo!attcan!uunet!lll-winken!lll-tis!helios.ee.lbl.gov!pasteur!ucbvax!bloom-beacon!ZERMATT.LCS.MIT.EDU!RWS
From: RWS@ZERMATT.LCS.MIT.EDU (Robert Scheifler)
Newsgroups: comp.windows.x
Subject: Xlib questions
Message-ID: <19880826014751.5.RWS@KILLINGTON.LCS.MIT.EDU>
Date: 26 Aug 88 01:47:00 GMT
References: <8808241725.AA04947@penzance.cs.ucla.edu>
Sender: daemon@bloom-beacon.MIT.EDU
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    Date: 24 Aug 88 17:25:52 GMT
    From: CS.UCLA.EDU!tek@bloom-beacon.mit.edu  (Ted Kim (ATW))

    Which half of the timestamps are in the future? 
    Conversly, which timestamps are in the past?

Here's the relevant code from the MIT server:

#define HALFMONTH ((unsigned long) 1<<31)
TimeStamp
ClientTimeToServerTime(c)
     CARD32 c;
{
    TimeStamp ts;
    if (c == CurrentTime)
	return currentTime;
    ts.months = currentTime.months;
    ts.milliseconds = c;
    if (c > currentTime.milliseconds)
    {
	if (((unsigned long) c - currentTime.milliseconds) > HALFMONTH)
	    ts.months -= 1;
    }
    else if (c < currentTime.milliseconds)
    {
	if (((unsigned long)currentTime.milliseconds - c) > HALFMONTH)
	    ts.months += 1;
    }
    return ts;
}



    To make things concrete, suppose I called XAllocColorCells and got 2
    planes (1,2) and 2 pixels (24,28). Now suppose, I want to free all of
    these colors. What arguments should I use with XFreeColors to do this?

The "planes" value should be the OR of the (2) planes you got from
XAllocColorCells, and "pixels" should be the list of pixels.