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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: <9106252143.AA00641@lightning.McRCIM.McGill.EDU>
Date: 25 Jun 91 21:43:09 GMT
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
Lines: 29

> Apparently GC's have depth as an invisible attribute.  You can't
> query it, you can't change it, it's only documented in the protocol
> spec, but if it doesn't match your program aborts.

The Xlib manual states:

	GC XCreateGC(display, d, valuemask, values)
	      Display *display;
	      Drawable d;
	      unsigned long valuemask;
	      XGCValues *values;
	
	display   Specifies the connection to the X server.
	
	d         Specifies the drawable.
	
[descriptions of valuemask and values deleted]
	
	The XCreateGC function creates a graphics context and returns a
	GC.  The GC can be used with any destination drawable having
	the same root and depth as the specified drawable.  Use with
	other drawables results in a BadMatch error.

Is that explicit enough for you?

					der Mouse

			old: mcgill-vision!mouse
			new: mouse@larry.mcrcim.mcgill.edu