Re: [MiNT] FVDI/XBIOS (was Re: XaAES sources for FreeMiNT 1.16.3)

[Jo Even Skarstein <joska@online.no>]

Mark Duckworth skreiv:

> I was wondering this too for the obvious application vnc server.  You 
> could take it one step further and create a network vdi that can do 
> remote display ;)  I've been thinking about all of this but I'm so busy 

A network VDI would work - as long as the apps doesn't access the screen 
directly.

However, I think that a decent VNC server can be implemented with some 
additional support from the VDI (or by playing dirty and hook into the 
VDI trap). If you can monitor all drawing functions and clip the 
coordinates with the clip rectangle, you will easily be able to work out 
which parts of the screen you need to copy and send to the VNC viewer. 
You won't have to know the screen address at all - see below. But again 
- if some apps writes directly to the screen you will not detect this 
easily.

> with work (which is not really what I expected for this winter).  How do 
> screen capture apps work?

I would assume they use vro_cpyfm() to copy the whole or parts of the 
screen to a memory block. If you don't specify a source address the 
screen will be used as source, so you don't have to know the screen 
address at all.

Jo Even