Path: utzoo!attcan!uunet!samsung!sdd.hp.com!ucsd!ucbvax!U2.NCSA.UIUC.EDU!u36009
From: u36009@U2.NCSA.UIUC.EDU
Newsgroups: comp.sys.apollo
Subject: Re:  XGetImage
Message-ID: <9006081826.AA59326@u2.ncsa.uiuc.edu>
Date: 8 Jun 90 18:26:53 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 22

> If you've got a window and you know all its properties (in X11 I mean),
> is there a way to get the image data without doing an XGetImage, which
> allocates memory and takes time to copy all the pixels?

> I'd like to save a little time by just getting a pointer to the windows
> image arrays, and using it.

> Thanks,
> Scott Ferguson
> srfergu@erenj.bitnet

I think the problem comes from the fact that the X-Window server contains
the pixmap and the only way that the client can get at it is through its
resource id.  In other words, you cannot pass a pointer over the network
to get at the pixmap.  If you want the pixel contents for the drawable, you
must copy them over the (possible) network from the server to the client.
 

 =============================================================================
      Kem Ahlers                 u36009@u2.ncsa.uiuc.edu  (Internet) 
      Caterpillar, Inc. 
      Peoria, IL  USA