[Xorg] Composite and ABI stability

[Keith Packard]

Around 13 o'clock on Aug 6, Ian Romanick wrote:

> I ran into a similar problem a few months ago (probably closer to a year 
> ago now) with respect to GLX visuals on the client-side and on the 
> server-side.

Fortunately, I already have a structure on both server and client sides 
representing the visual structure -- the PictureFormat contains everything 
needed.  Removing the alpha fields from the visual affects *only* the 
ability of the core colormap code to pre-fill pixels with solid alpha 
values.  This helped me get Xterm running on the ARGB visual, but had no 
effect on Gtk+ or Qt applications (which have their own client-side 
TrueColor pixel allocation code).

I could also hard-code the pixel computations so that all bits from RGB to 
depth are set to one.  Or, we could kludge the colormap code to call back 
into the composite code to figure out what to do.  Anything but add 
elements to the Visual structure in the server.

-keith


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