surface buffer cardinality and outputs

[RenoX]

On Tue, Mar 19, 2013 at 11:34 AM, Jason Ekstrand <jason at jlekstrand.net>
wrote:
> I'm not sure exactly what I think of all this surface transform
> passing.  I'll get back to that once I get a chance to think about it.
>  Part of the problem is that you don't want to try and make your
> animations subpixel-perfect because that would require a lot of
> round-trips to make it right.

And you(Jerome Glisse<https://plus.google.com/u/0/117760209234006027091?prsrc=4>
) replied:
> It doesn't add more roundtrip, client will get next matrix like a
> frame event, client then draw in screen space and then draw with new
> transformation matrix. If client can't keep up it wouldn't either keep
> up in the non screen space rendering case.

I disagree: currently Weston move windows server side only, that is to say
without roundtrip,
if you want to be 'subpixel perfect' then moving a window imply to
re-render it from the client, which will add a lot of roundtrip in this
case.

So the current design is 'pixel perfect', but not 'subpixel perfect', and
cannot be without big changes..

regards,
renoX
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