Path: utzoo!mnetor!uunet!husc6!mailrus!ames!pasteur!ucbvax!ZERMATT.LCS.MIT.EDU!RWS
From: RWS@ZERMATT.LCS.MIT.EDU (Robert Scheifler)
Newsgroups: comp.windows.x
Subject: Server screen blanking for dumb displays
Message-ID: <880409104359.4.RWS@KILLINGTON.LCS.MIT.EDU>
Date: 9 Apr 88 14:43:00 GMT
References: <6290@watdragon.waterloo.edu>
Sender: usenet@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 18


    Date: 8 Apr 88 03:12:31 GMT
    From: mnetor!utzoo!utgpu!water!watmath!watdragon!jmsellens@uunet.uu.net  (John M. Sellens)

	       So, contrary to the Xqvss man page insisting that it
    supports all the standard server features, no matter how you set
    the "v" flag to Xqvss, your screen won't blank.

Xqvss does support all the standard server features; blanking support
is not required by the protocol.

    This change
    causes it to tile your screen all black if you prefer blanking.
    So the effect is the same, it's just not as efficient.

Your code isn't using black, it's using BlackPixel.  There's absolutely
no guarantee that BlackPixel is black.  There isn't even a guarantee
that a pixel exists corresponding to real black in the default colormap.