Hi,
>(3) Don't calculate the scale from the display resolution
(QPlatformScreen::pixelDensity()). >In QT5.5 the devicePixelRatio is
obviously set to either 1.0 or 2.0 depending on the >resolution of the
display. I'm not sure for Qt5.6, but it seems to be alike here. However,
in Win the >user can set a scaling such as 100%, 125%, 150%, 200%, and
250%, and the user >can do so - and may want to do so - for whatever
display she/he is using (anyone with ailing eyes is >happy to use 125%
on regular screens, or 250% on HDPI screens ;)). So - IMHO - >the
devicePixelRatio should actually be set to exactly this value,
independent on any display resolution.
The Windows setting is not related to any scaling done by Qt. It only
changes the return values of the metrics functions (logical DPI, font +
icon sizes, etc); no devicePixelRatio scaling is done there.
>Sadly, I must agree with you that Qt does indeed not handle high-dpi
windows very well L I have Qt applications that I cannot use on my
system, and have resorted to qt.conf to >turn off DPI-awareness for
them; fuzzy scaling was preferable to not being able to use the application.
There is a restriction currently in that the Windows styles are not
suitable for scaling. We recommend using Fusion style for High DPI.
Regards,
Friedemann
--
Friedemann Kleint | The Qt Company
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