[Intel-gfx] [PATCH 09/12] Do more checks for proposed flip pixmaps

[Eric Anholt]

Keith Packard <keithp at keithp.com> writes:

> Make sure the pitch and tiling are correct.
> Make sure there's a BO we can get at.

I thought we couldn't change these parameters, but now I can't find what
prevents them from changing.  Can you cite sources?
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