> ok... So There's no implementation of overlay using an independent surface on any 
> driver?

Not any open-source driver...

> Also, what is the xf8_32wid? I see that's it's an implementation of the xf8_16bpp 
> but for an 8 over 32 > surface. But what does
the wid stand for?

Someone may know better than me, but when I see WID I think of Window ID
planes or attribute planes.  I don't know that that's what WID stands for
in this case.  I'm not really familiar with the xf8_32wid module.

Some devices have a surface that controls, among other things,
which surface is selected, per pixel.  These can be really useful for fast
double buffer swapping (a register write -vs- a CopySwap or a full WID plane
paint).  They can also control gamma correction and pixel formatting.  WID
planes seem to be quickly fading into extinction with modern graphics devices...

Derek

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