[Resend] Patch: fix regression introduced in intel driver version 2.16.0

[Chris Wilson]

On Fri, 6 Jan 2012 14:53:29 +0000, Chris Clayton <chris2553 at googlemail.com> wrote:
> Hi,
> 
> I sent this message on 29 December, but I guess all the intel driver developers were busy with 
> (well-earned) Yuletide relaxing. Here it is again with the graphics-related output from lspci 
> added...
> 
> I recently upgraded from version 2.15.0 of the intel driver to 2.17.0 but found that with the latter 
> a trail of 'droppings' was left in the otherwise blank areas of a konqueror window when an icon was 
> dragged around in the window, under kde-3.5.10. The 'droppings' can be cleaned up by refreshing the 
> window. Investigation showed that the fault is also present in 2.16.0. I cloned the git archive and 
> through bisection identified the change that introduced the problem as:
> 
> commit ace324e4aa27effdd621156eec03f3f87b610732
> Author: Eric Anholt <eric at anholt.net>
> Date:   Tue May 31 23:13:18 2011 -0700
> 
>     uxa: Simplify BLT solid acceleration for spans filling by only clipping once.
> 
> Due to subsequent changes that patch cannot be reverted but the attached patch reverts the 2.17.0 
> driver to its old (2.15.0) behaviour  and eliminates the 'droppings'.

Should be fixed with

commit 429a36f7481b9bfd5ed137642d2916d69a713557
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Fri Dec 9 09:54:12 2011 +0000

    uxa: Fix clip processing for uxa_fill_spans()
    
    Fixes regression from e0066e77e026b0dd0daa0c3765473c7d63aa6753
    (uxa: Simplify Composite solid acceleration for spans by only clipping
    once) [2.15.901]
    
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=43649
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

Can you confirm by testing with master?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre