Re: [Qemu-devel] Ongoing changes to the displaying code

[Anthony Liguori]

Riku Voipio wrote:
> On Fri, Jan 09, 2009 at 11:24:42AM -0600, Anthony Liguori wrote:
>   
> > If you search the mailing lists, I went down this route before I 
> > originally wrote the VNC server.  XEmbed has some serious limitations 
> > surrounding how events are propagated between windows.  I convinced 
> > myself that you couldn't do what you really wanted to do through this 
> > mechanism.
> >     
>
> Howabout using passing a window xid from the GUI app to qemu with
> command line paramater -parent ? This is how Xoo[1] starts Xephyr
> (or Xnest) in itself:
>
> [1] http://labs.o-hand.com/xoo/
>   

Window events won't propagate (things like focus cycling).  There is 
tons of information about why these things don't work well in practice 
out there for those interested in googling.

> > Of course, with the right VNC extension to support a shared memory 
> > transport, I still contend VNC can be just as efficient as SDL.
> >     
>
> It still puts a big speed and flexibility limit IMHO.
>   

Why?  There's no additional memory copying.  There's a very small update 
latency addition.