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From: mouse@lightning.mcrcim.mcgill.EDU (der Mouse)
Newsgroups: comp.windows.x
Subject: Re:  Is there some way to find out what a BadMatch is about?
Message-ID: <9106221640.AA00674@lightning.McRCIM.McGill.EDU>
Date: 22 Jun 91 16:40:45 GMT
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
Lines: 26

> I've got this program which works fine on monochrome screens, but
> when I try running it on a PseudoColor screen I get BadMatch errors
> from innocuous calls like XDrawPoint and XFillRectangle.  So I was
> just wondering if anyone has any tricks for finding out what the
> server thinks doesn't match.  I suppose I could run the server in a
> debugger, but that's a hassle.

Run it under xscope, that's what I find is generally best.  That way
you can see precisely what requests are being sent....

> More details: I'm drawing to an off-screen Pixmap created with
> XCreatePixmapFromBitmapData(display,root,data,width,height,1L,0L,1).
> The GC's I use have foreground and background set to 1L and 0L, and
> planemask set to 1L.

Aha.  I bet the GC was created with a depth equal to the default depth
of the screen, and you're trying to use it with a pixmap that's always
of depth 1.

(Also, with those arguments, XCreatePixmapFromBitmapData is overkill;
just use XCreateBitmapFromData instead.)

					der Mouse

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