<AWT Dev> Why no fractional scale factor in AWT with X11?
florent at hihan.org
Wed Nov 6 19:02:05 UTC 2019
Contrary to Windows and MacOS X, the X11 implementation of AWT on Linux
doesn't use a floating scale factor internally. For instance, setting
the Gnome desktop property
'org.gnome.desktop.interface/text-scaling-factor' to 2.2 will produce a
x2.0 transform for a Swing application.
I've had a look into the latest JDK sources (14) and the coercion to int
seems arbitrary to me considering that both the portable layer and the
native side rely on doubles. In fact, I've removed it without much
changes and everything seems to work fine. Honestly, I haven't conducted
enough tests to claim it hasn't any issues, but I didn't see blatant
problems neither. Of course, there are a lot of resources on the net
discussing HiDPI support with Java on various platforms and I understand
that the scale factor could be rounded for aesthetic reasons, but I'm
not sure it's the rational behind how the code behaves today for X11.
Is there a specific reason I ignore or is this capability just something
nobody is interested in on Linux?
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