https://bugzilla.redhat.com/show_bug.cgi?id=1645763
--- Comment #5 from Nikolaus Waxweiler <madigens(a)gmail.com> ---
I think I narrowed it down: simply defining FT_CONFIG_OPTION_SUBPIXEL_RENDERING
without changing anything else (i.e. recompiling other packages) gives you
subpixel rendering, but e.g. Gtk3 will not filter it. Leaving FreeType vanilla
(thereby using the alternative subpixel rendering method that, according to the
comment above the FT_CONFIG_OPTION_SUBPIXEL_RENDERING define, does not need
filtering) gives you proper looking subpixel rendering.
So I guess there's two possibilities:
1) Try to recompile cairo/Qt for these changes.
2) Delete freetype-2.3.0-enable-spr.patch and freetype-2.9-ftsmooth.patch and
use the alternative implementation that works surprisingly well, at least on my
landscape-rotated, RGB-subpixel monitor.
The alternative implementation does not support setting LCD filters manually
(as it is essentially the light LCD filter), so one would not be able to use
fontconfig's lcdfilter settings. I think. Not sure if this affects anything
else.
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