Can anyone tell me about the status of the backing store support these
days? I wonder:
* Should miInitializeBackingStore() be used? I've found the comment in
mibstore.c:
"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.
* 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"?
* Backing store doesn't really seem to work reliable; it would be nice if
http://bugs.freedesktop.org/show_bug.cgi?id=19654 could get some
attention.
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.
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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