Physical ouptut sizes

[Keith Packard]

On Tue, 2006-10-10 at 12:17 +0200, Matthias Hopf wrote:

> - Layout systems, displaying A4 or Executive paper in real size.
>   Actually, some kind of visualization. Used to get a feeling how the
>   overall page impression is. Professional layouters use this technique
>   a lot. Sometimes I can imagine they even use rules (real-life ;) in
>   order to measure something, or comparing size changes to a real
>   printout.
> - Visualization packages. Car manifactures e.g. use powerwalls in order
>   to see virtual cars in real size. They want the model to be size exact
>   down to the millimeter.
>   Usually these systems are handtuned and using OpenGL, but still we
>   should be aware of this use case.
> - As you mentioned it: Augmented reality. Though right now these systems
>   are handtuned ATM, and not really production-ready.

This is one of the reasons RandR 1.2 separates the monitor size
information from the logical screen size information; using monitor size
information, the application can know precisely how things are presented
to the user while we let the screen dimensions continue to be used for
overall application scaling as a user preference. Yes, this is an abuse
of the existing screen dimension information, but in a world where the
screen is purely abstract and many monitors present that data to the
user, I'm not sure we've got a better plan.

-- 
keith.packard at intel.com
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