[Xorg] Composite and ABI stability

[Keith Packard]

Around 20 o'clock on Aug 6, Soeren Sandmann wrote:

> #ifdef COMPOSITE
>     unsigned long	alphaMask;
>     int			offsetAlpha;
> #endif

I didn't remember this part of the work.  It's really not necessary part 
of the Composite implementation, it's only used to 'kludge' the color 
lookup code in colormap.c to return colors with alpha bits already set to 
one.

We can easily fix this by having the colormap code call directly into the 
composite extension and get the appropriate values for "non-core" visuals.

I'll see about fixing this after I get trapezoids integrated into CVS.

-keith


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