On Sunday 23 February 2014, igor.mironc...@gmail.com wrote:
> QScreen::physicalDotsPerInch returns the same value as
> QDesktopWidget::physicalDpi.
> 
> But why do you think that QScreen::physicalDotsPerInch more reliable?
> 
> P.S. I did not look at the Qt code yet, but I guess that I have to do it...
> 
QScreen is a more direct source, and it has more raw data. A QWidget can have 
been moved from one screen to another, or overlap multiple screens, all making 
its screen specific information less direct and more error-prone.

Too bad QScreen didn't have the information you needed though. 

`Allan
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