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Date: Fri, 09 Jan 2009 12:59:11 -0600
From: Anthony Liguori <anthony@codemonkey.ws>
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Subject: Re: [Qemu-devel] Ongoing changes to the displaying code
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To: qemu-devel@nongnu.org

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.