On Wednesday 21 September 2016, Rubin Abdi wrote:
> I recently switched to an X1 Carbon 4th gen with the nicer HIDPI display.
> Sadly the rest of the desktop displays I plug into are still the old
> density. I noticed recently in 5.7.4 that most Qt based applications will
> do some notion of font DPI re-rendering when a window moves from one
> display to another, which is a step in the right direction though I wish
> there were some more exposed settings to specify which scaling factors for
> each monitor independently.
> 

See http://doc.qt.io/qt-5/highdpi.html and QT_SCREEN_SCALE_FACTORS for 
instance.

A UI application for that would be nice though.

Not sure if there are C++ APIs for it, if there aren't, just propose an API 
and open a bug on it. 

Best regards
`Allan

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