VNC SPU not sending frame updates, currDirtyRegion being the cause

Hi,
I just checked out the cvs head. I'm using one of the demo apps, city
and a vnc spu. If I connect a vncviewer to the vnc reflector offered by
the spu, I get no updates, only a blank screen. I believe this has been
reported before.

I've looked into the code and so far identified that the currDirtyRegion
struct is *never* updated. Therefore the SPU thinks there isn'y anything
dirty to put into a framebuffer update.

A quick hack by forcing newWindowSize to true (and therefore filling the
dirtyRegion with the whole window) confirms this is the case:
framebuffer updates will be sent to the vncviewer. The same happens if I 
disable "use_bounding_boxes"

Even with this quick fix, framebuffer updates are sent to the viewer in 
a very choppy manner. I think there is some mishandling of the RFB 
porotocol going on as well.

I hope this inspires someone more adept with this code to find the
appropriate fixes.

Thanks a lot
Andres



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