[PATCH] mi: Remove unused overlay support

[Aaron Plattner]

On Mon, Mar 28, 2011 at 11:36:04PM -0700, Mikhail Gusarov wrote:
> The only reference to it in server and free drivers is in XAA overlay code which
> would segfault as no miInitOverlay is called ever.
> 
> Quoting Jamey Sharp:
> 
> """
> It wasn't obvious to me that the patch was correct, because you pretend that
> miOverlayCopyUnderlay returns false instead of crashing.  But on further
> inspection I see that XAACopyWindow8_32 could only set doUnderlay to true if
> it's called from miOverlayMoveWindow or miOverlayResizeWindow, which can only be
> called if miInitOverlay has hooked those functions, and I can confirm that no
> driver or server code calls that.
> """
> 
> The only known user of this code is proprietary NVidia driver, and NVidia
> developers were notified about this breakage since June of 2010, so there was
> enough time to adapt to it by e.g. putting copy of file into driver itself.
> 
> Signed-off-by: Mikhail Gusarov <dottedmag at dottedmag.net>
> Reviewed-by: Jamey Sharp <jamey at minilop.net>

NAK.  This code is not NVIDIA-specific just because only the NVIDIA driver
currently uses it.  We can move it into the driver if you really think it's
necessary, but from a software design standpoint it's the wrong thing to
do.

It's ironic that I'm the one arguing to keep our driver less proprietary.

-- Aaron