On Thu, 12 Mar 2009, Adam Tkac wrote:
"There is no longer an mi implementation of backing store. This function
is only for source compatibility with old drivers."
However, the function is not an no-op, and there are still servers that
calls this function. This includes Xvfb, Xwin, kdrive and DMX.
AFAIK "old style" backing store is dead.
Yes, this is what I understand as well from the comment and others, but in
that case, why does Xvfb and all those others still use
miInitializeBackingStore? Perhaps no one has migrated them to the "new
style".
* Assuming that Composite can provide backing store support, why is
backing store disabled by default, even if Composite is used? If a server
such as Xvfb or Xvnc wants to enable backing store by default, does it
have to do anything else than just set
"pScreen->backingStoreSupport=Always"?
Set backingStoreSupport to Always should be OK.
This is what we have today. This has two drawbacks:
1) It differs from what other "normal" Xorg servers does; they disables
backing store by default.
2) It exposes the backing store bug I mentioned.
I have experience that Composite is sometimes broken. If I remember
correctly for example if you use WindowMaker and Xvnc with 16bpp
screen is corrupted. But my information might be outdated.
I will do some testing with the newest X source & Composite enabled.
Good, thanks.
My primary objective is to make sure Xvnc in TigerVNC can properly run
KDE4. The easy solution is to simply remove
"pScreen->backingStoreSupport=Always", but I'd like to know if this is
the "correct" way of doing it. Of course, it will still crash if "+bs" is
manually specified, just like the normal Xorg, due to the bug above.
Do you know if KDE4 requires composite?
Don't know, will test tomorrow.
In all cases please open new ticket in our feature tracker that we
should start to support composite ext.
But doesn't we already?
Best regards,
---
Peter Åstrand ThinLinc Chief Developer
Cendio AB http://www.cendio.com
Wallenbergs gata 4
583 30 Linköping Phone: +46-13-21 46 00
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