You can also check the device pixel ratio for image “@2” alike:
qreal pixel_ratio = QGuiApplication::primaryScreen()->devicePixelRatio();
unsigned int image_scale_ratio = pixel_ratio / 1u;
QString m_image_scale = image_scale_ratio <= 1u ? "" :
QString("@%1x").arg(image_scale_ratio);
This is what I do.
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From: Interest <interest-boun...@qt-project.org> On Behalf Of Jérôme Godbout
Sent: March 18, 2019 2:13 PM
To: Vadim Peretokin <vpereto...@gmail.com>; interestqt-project.org
<interest@qt-project.org>
Subject: Re: [Interest] How to detect a HiDPI display with Qt?
You can check the dpi of the screen:
QGuiApplication::primaryScreen()->logicalDotsPerInch();
You can then check if the dpi is above certain threshold to do thing
differently. Normal desktop full HD screen dpi is around 96.
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Jérôme Godbout
Développeur Logiciel Sénior /
Senior Software Developer
p: +1 (418) 800-1073 ext.:109
amotus.ca<http://www.amotus-solutions.com/>
statum-iot.com<http://statum-iot.com/>
[cid:image015.png@01D4DD95.0986ECD0]<https://www.facebook.com/LesSolutionsAmotus/>
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From: Interest
<interest-boun...@qt-project.org<mailto:interest-boun...@qt-project.org>> On
Behalf Of Vadim Peretokin
Sent: March 18, 2019 1:00 PM
To: interestqt-project.org
<interest@qt-project.org<mailto:interest@qt-project.org>>
Subject: [Interest] How to detect a HiDPI display with Qt?
I'm not clear on how to detect if a display is HiDPI with Qt. I've tried
QApplication.desktop()->screen()->devicePixelRatio() but even that returns 1
for a display that is 3840x2160.
Has anyone got hints on how to do this successfully?
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