[Development] Fonts in QtWidgets and QtQuick

Jean-Michaël Celerier jeanmichael.celerier at gmail.com
Sun Nov 25 22:32:30 CET 2018

Did you enable native text rendering in Qt Quick ?


Jean-Michaël Celerier

On Sun, Nov 25, 2018 at 10:55 PM Alberto Mardegan <
mardy at users.sourceforge.net> wrote:

> Hi all!
>   I'm working on a desktop style for the QtQuick Controls 2 API [1], and
> as I'm trying to achieve a pixel-by-pixel equivalence with QtWidgets,
> I'm writing unit tests which graphically compare the output generated by
> my controls versus that generated by QtWidgets.
> I'm getting some issues with the fonts, for example in the buttons'
> label: they just don't match, despite the fact that the QFont set on the
> QPainter is exactly the same. For some reason, the lower levels of the
> graphical stack (FontConfig, I presume) select a different font in
> QtQuick, compared to the one used in QtWidgets.
> The issue seems to go away if I run the tests under xvfb and specify a
> different configuration file for FontConfig [2]. While this does the
> trick, I'm left wondering whether (and where) QtWidgets somehow
> initializes FontConfig differently from QtQuick. I guess I could get rid
> of some hacks and truly achieve a pixel perfect replacement if I found
> the way to replicate QtWidgets' font configuration in my QtQuick module.
> Any ideas?
> Ciao,
>   Alberto
> [1]: https://gitlab.com/mardy/qqc2-desktop
> [2]:
> https://gitlab.com/mardy/qqc2-desktop/commit/caba6e67ce745d0653a10ccf8d801ad799129668
> --
> http://blog.mardy.it - Geek in un lingua international
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