What exactly is Drawable->x/y ?

[Matthias Hopf]

This might sound stupid, but what exactly is pDrawable->x and y
describing? It cannot be the starting offset *inside* the drawable (as I
have already seen y numbers larger than height). Is this used WRT the
physical drawable layout for the memory manager?

Or to ask it differently: are these structures properly documented
somewhere? I couldn't find anything in the usual suspects.

FYI: this is for a fast path improvement for XAAComposite
(bugzilla #4320).

Thanks

Matthias

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