Re: [Qemu-devel] [PATCH] VNC display support for QEMU

[Anthony Liguori <anthony@codemonkey.ws>]

Hi Johannes,

Johannes Schindelin wrote:
> Hi,
>
> On Sat, 29 Apr 2006, Anthony Liguori wrote:
>
>   
>> One thing you may notice is that RealVNC has some issues with being
>> disconnected.  This is because it likes to switch from 8bit to 32bit depths
>> automatically at startup.  Unfortunately, there is a race condition in the VNC
>> protocol and since this implementation is asynchronous, we seem to be much
>> more prone to exposing this.
>>     
>
> This, along with other problems, has been solved with LibVNCServer. But of 
> course, you are welcome to solve them again.
>   

I should mention, the majority of the "smarts" of this patch are QEMU 
specific optimizations.  The first one maintains a separate copy of the 
client's framebuffer to use to reduce the size of the updates generated 
by the VGA code.  The second one hooks the Cirrus 2d video-to-video copy 
to generate VNC CopyRect updates.

The actual VNC side of the code is pretty trivial.

I would have been more inclined to use LibVNCServer if it wasn't based 
on threading.  I really wanted an asynchronous implementation of a VNC 
server that didn't depend on threads.

Regards,

Anthony Liguori

> Ciao,
> Dscho
>
>
>
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