[Nouveau] [Bug 97568] read pixels of MSAAx8 surface stretched horizontally/vertically

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97568

--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
As I mentioned on IRC, I strongly believe this is due to the following issue:

https://trello.com/c/jzBpfrzL/134-resolve-on-transfer-map-upscale-on-transfer-unmap

Basically we're supposed to do a resolve on transfer_map, return the resolved
image, and if any of it is changed, copy back at unmap time while up-scaling.

We do none of that right now, and 8x MSAA is laid out in a 4x2 grid for each
pixel, so it makes sense that the output would be "scaled up" that way.

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