[PATCH] mi: Remove unused overlay support

[Aaron Plattner]

On Tue, Mar 29, 2011 at 09:47:19AM -0700, Mikhail Gusarov wrote:
> Twas brillig at 09:26:19 29.03.2011 UTC-07 when aplattner at nvidia.com did gyre and gimble:
>
>  AP> NAK.  This code is not NVIDIA-specific just because only the NVIDIA
>  AP> driver currently uses it.
>
> I did not claim it. I just said it's unused.

And I'm disagreeing about it being unused.  I'm actually surprised that
none of the other drivers use it since workstation overlays are still
heavily used.

>  AP> We can move it into the driver if you really think it's necessary,
>  AP> but from a software design standpoint it's the wrong thing to do.
>
> Keeping unused code in mi is wrong from software engineering standpoint
> as well.

I disagree.  mi is a toolkit of machine-independent driver support
routines.  While I understand that X needs to advance forward and gain
features, I don't think it should turn its back on its loyal professional
workstation heritage either.  NVIDIA is committed to supporting both the
forward advancement of the window system and traditional X features like
overlays.  It is disappointing if no other driver shares both those
commitments.

The mi overlay code is not hardware-specific, and architecturally makes the
most sense in the X server's mi layer.  You can sign me up as the
maintainer if you think it's a maintenance burden.

-- Aaron