That's fun.
MK> Sure, if that's feasible to implement.
Yes, it's easy. And it doesn't break the protocol.
Shadowfb, you introduce noise upon blasting to the real framebuffer.
Because, GetImage and friends work from the shadowfb, you're not
breaking the protocol.
You might actually end up with an implementation that is not
measurably slower than stock shadowfb.
(That's my interpretation of the protocol: an X server that produces a
black screen does respect the protocol, as long as GetImage returns
the right data. Your interpretation may differ.)
Now of course you need to look out for your shadowfb RAM broadcasting ;-)
Juliusz
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