[Interest] QDatastream, QMap, QImage serialization

[william.crocker at analog.com]

> To summarise:
> - Qt is a graphical toolkit

...and I used it to create a graphical application.
But then my users wanted to create hard copy from
batch jobs running on our compute farm. Those machines
do not provide access to an X server and, as we have discovered,
Qt needs an X server for a lot of things.

So, now, if my app does not detect an X server, I start up
an Xvfb instance and continue on with use of a regular QApplication.

Works great.

Bill

> - Some Qt classes shouldn't be part of QtGui
> - We have to accept that Qt doesn't give a bullock about mathematical
> exactness (Graphical rendering is key)
>
> My 2 cents.
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