[PULL] build fix, GC clipping cleanup

[Aaron Plattner]

On 10/04/2011 09:33 AM, Keith Packard wrote:
> On Tue, 4 Oct 2011 18:19:54 +0200, Michal Suchanek<hramrach at centrum.cz>  wrote:
>
>> Wasn't it just renamed from DestroyPixmap to ReleasePixmap?
>
> The function was renamed, but the screen structure member was not (nor
> should it have been -- it's now actually called when the pixmap is
> destroyed, not just when dereferenced).
>
> Oh, this patch sequence should *definitely* come with an ABI bump;
> there's no way you can change driver source code so it can build with
> either version...

With the old CreatePixmap API, drivers could override the width and 
height when calling down to prevent the fb layer from allocating the 
pixmap memory, and then plug in its own.  It looks like a driver could 
do the same thing now by changing the pixmap structure's width and 
height to 0 temporarily, but it looks like that will cause the new code 
to call malloc(0) and then fail if it returns NULL.

-- Aaron