Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!clyde.concordia.ca!uunet!wuarchive!usc!ucsd!helios.ee.lbl.gov!pasteur!ucbvax!bloom-beacon!EXPO.LCS.MIT.EDU!rws
From: rws@EXPO.LCS.MIT.EDU (Bob Scheifler)
Newsgroups: comp.windows.x
Subject: Re: Clip Masks
Message-ID: <8912151355.AA01035@expire.lcs.mit.edu>
Date: 15 Dec 89 13:55:08 GMT
References: <1506@utkcs2.cs.utk.edu>
Sender: root@athena.mit.edu (Wizard A. Root)
Organization: The Internet
Lines: 13


	1) XCreateImage requires a visual which must "match the visual
           of the window [or pixmap, I presume] the image is to be displayed
           in".

You can just pass NULL for the visual.  The visual is really only used to
set the red/green/blue_mask components in the image, and those components
are actually never used by Xlib itself.

    XPutImage(display, clip_mask, gc, tmpimage, 0, 0, 0, 0, width, height);

You didn't show the code that created the gc.  My guess is that you created
the gc for the wrong depth, e.g. depth 8 instead of depth 1.