Path: utzoo!attcan!uunet!mailrus!shadooby!umich!dip.eecs.umich.edu!anon
From: anon@dip.eecs.umich.edu (Omar S. Juma)
Newsgroups: comp.windows.x
Subject: Re: Pieces of Eight!!!
Message-ID: <1130@zip.eecs.umich.edu>
Date: 17 Dec 89 21:33:24 GMT
References: <1124@zip.eecs.umich.edu> <1439@crltrx.crl.dec.com>
Sender: news@zippy.eecs.umich.edu
Reply-To: anon@dip.eecs.umich.edu.UUCP (Omar S. Juma)
Organization: University of Michigan EECS Dept., Ann Arbor, MI
Lines: 87

In article <1439@crltrx.crl.dec.com> jg@max.crl.dec.com (Jim Gettys) writes:
>The X server?  We only sell X servers on around a dozen different
>displays, on 3 different
>machine architectures, under 3 different operating systems.
>
>How about giving us a hint of what kind of display on what kind of
>machine, using
>whose X server (Digital's or MIT's), on which operating system?  Or is
>that asking too much?
>				- Jim

Sorry, the original message got a bit scrambled after a sleepless night.
Here's the missing golden coins:

    Hardware: DECstation 3100, 16 MB RAM, 2 x RZ55 drives
              19" color monitor
              standard DEC keyboard (LK201) & mouse (puffed-up hockey puck)

    Server: Xcfb from mid-spring (mod date on disk is May 1, which is fairly
            close to when my workstation was configured).  Server came from
            DEC, since this was a demo machine (more precisely, from Palo Alto).

    OS: Ultrix 3.0

    Symptoms: pixmaps of width not a multiple of 8 cause junk to appear in
              area where pixmap is repeatedly tiled, after first tile on
              left of area.  When the root is tiled with such a pixmap, the
              root appears clean until you move a window or pop a menu, etc.
              Then you get window residuals on the root.  A variety of similar
              alignment errors occur, all of the same flavor.

I haven't had much time to test this on other DEC platforms on campus (no
time anymore for such luxuries), but my guess is it's a MIPS-based bug.
The bug may have been fixed by now, but I haven't heard anything official
regarding a patch since I started using my DEC3100 in September.  Other
than this bug, it's one of the better servers I've worked with.

I *believe* one of our labs has DECstations running Ultrix 3.1, and I've seen
the problem repeated there as well.  Of course, we're all anxiously awaiting
the 4.0 release, when shared libraries finally make it into the OS. :-)


...anon...


P.S: Here's a bitmap that definitely upsets my server:


#define g0_width 51
#define g0_height 46
#define g0_x_hot 0
#define g0_y_hot 47
static char g0_bits[] = {
   0x2e, 0x99, 0xb9, 0x64, 0xba, 0x64, 0x02, 0xc9, 0xa5, 0x27, 0x95, 0x25,
   0x97, 0x06, 0xff, 0xff, 0xfe, 0xff, 0xfd, 0xff, 0x07, 0x22, 0x19, 0x89,
   0x64, 0x8a, 0x64, 0x04, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x07, 0x89,
   0x49, 0x26, 0x93, 0x24, 0x25, 0x01, 0xff, 0xff, 0xff, 0xff, 0xfd, 0xff,
   0x07, 0x2e, 0x99, 0x99, 0xac, 0xbf, 0x6c, 0x02, 0xc9, 0x66, 0x66, 0x93,
   0x24, 0x93, 0x07, 0xff, 0xff, 0xfe, 0xff, 0xff, 0xff, 0x06, 0x22, 0x91,
   0xa9, 0x64, 0xaa, 0x24, 0x01, 0xff, 0xff, 0xff, 0xff, 0xfb, 0xff, 0x07,
   0xc9, 0x6c, 0x26, 0x97, 0x26, 0xb3, 0x01, 0x2e, 0x9b, 0xd9, 0x64, 0xd9,
   0x6c, 0x06, 0xff, 0xfd, 0xbf, 0xff, 0xbf, 0xdf, 0x07, 0xc9, 0x24, 0x25,
   0x91, 0x24, 0x93, 0x00, 0xff, 0xff, 0xff, 0xdf, 0xff, 0xff, 0x07, 0x26,
   0x99, 0xa9, 0x64, 0x9a, 0x64, 0x06, 0xff, 0xff, 0xbe, 0xff, 0xfb, 0xfe,
   0x07, 0xd9, 0x65, 0x6d, 0x57, 0x46, 0x97, 0x01, 0x26, 0x99, 0xa9, 0xa4,
   0xa9, 0x64, 0x06, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x07, 0xc9, 0x24,
   0x25, 0x91, 0x24, 0x93, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x07,
   0x2e, 0x9b, 0xba, 0x64, 0xda, 0x6c, 0x06, 0xc9, 0xe4, 0x26, 0x97, 0x25,
   0x93, 0x02, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x07, 0x22, 0x99, 0x88,
   0x64, 0x8a, 0x24, 0x06, 0xff, 0xff, 0xff, 0xff, 0xf5, 0xf7, 0x03, 0xd9,
   0x24, 0x33, 0x93, 0xce, 0x9c, 0x04, 0x2e, 0xdb, 0xcc, 0xac, 0x3b, 0x63,
   0x05, 0xff, 0xff, 0xff, 0xff, 0xee, 0xfe, 0x07, 0xc9, 0x24, 0x25, 0x93,
   0x24, 0x93, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xdf, 0x07, 0x22, 0x99,
   0x89, 0x64, 0xaa, 0x64, 0x02, 0xff, 0xff, 0xfe, 0xff, 0xff, 0xff, 0x07,
   0xc9, 0x65, 0x25, 0x97, 0x45, 0x97, 0x01, 0x2e, 0x99, 0xdb, 0x64, 0xba,
   0x64, 0x06, 0xff, 0xff, 0xfe, 0xff, 0xff, 0xff, 0x07, 0x49, 0x24, 0x25,
   0x91, 0x24, 0x91, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x07, 0x2e,
   0x59, 0xb9, 0x64, 0xba, 0x64, 0x07, 0xc9, 0x65, 0x27, 0x97, 0x25, 0x97,
   0x01, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x07, 0x22, 0x19, 0xc9, 0x64,
   0x8a, 0x64, 0x06, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x07};


P.P.S: For a more vivid demonstration, run GWM with MWM emulation mode right
       off the distribution tape.  The titlebars and window borders get striped
       for precisely the same reasons (for the longest time I thought it was
       a French twist on the Motif look, but after looking at the MWM emulation
       files, I saw "pixmap" all over the place, and my parrot started shrieking).