ahartmetz added a comment.
Just to make this extra clear, I have nothing against auto-scaling. There is
probably a KCM to set it however I want if I don't like the default. My problem
is with blurry and in some cases ("-=") disfigured font rendering. That should
never happen regardless of physical and logical DPI (though no subpixel
rendering and maybe no hinting might be fine at >= 2.0 scaling). With this
patch, it looks like with Qt 5.13 on not very high DPI screens, which is fine.
I don't own a really high DPI screen so far.
I would guess that a full solution is somewhere in the guts of the Qt
FreeType font engine, not in how DPI is determined. The scaling factor is
always just one number (correct me?), and regardless of its value, the
rendering should look good. I have some experience in Qt font engines, but very
little with high DPI. This patch is what I could come up with without days of
research. Can somebody with serious knowledge about high DPI help out here?
REPOSITORY
R120 Plasma Workspace
REVISION DETAIL
https://phabricator.kde.org/D26185
To: ahartmetz, #plasma, apol, davidedmundson
Cc: asturmlechner, dfaure, davidedmundson, anthonyfieroni, plasma-devel,
LeGast00n, The-Feren-OS-Dev, jraleigh, zachus, fbampaloukas, GB_2, ragreen,
ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg,
abetts, sebas, apol, ahiemstra, mart
