[Interest] Qt5 font size issue with fontconfig

Thiago Macieira thiago.macieira at intel.com
Sat Oct 31 22:50:17 CET 2020

On Saturday, 31 October 2020 04:34:08 PDT Ramakanth Kesireddy wrote:
> Hi,
> After porting the Qt 4.8 application to Qt 5.6.3 on embedded Linux(Yocto)
> with fontconfig, the font sizes appear larger on target.
> The Qt 4.8 application font size setting with 14pt default font appears
> larger in Qt 5.6.3 with fontconfig and needed fonts added in default
> fontconfig directory /usr/share/fonts.
> The dpi of the device is 141.
> Do I need to reduce the font size pt or set any environment variable scale
> factor so that text appears normal?

Most likely, Qt 5 is displaying the fonts correctly and Qt 4 isn't because Qt 
4 didn't support HighDPI.

In other words, the bug that existed has been fixed. If your UX people thing 
it's too bug, then reduce the size.

Also, upgrade to at least 5.12.

Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel DPG Cloud Engineering

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