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<p>So I tested this on my Asahi Fedora Linux KDE setup. So you were
right about the scaling-factor being set to 1, but I'm still a
little bit confused about this situation.</p>
<p>If I go into the KDE settings, and change the display scaling to
150% for example, other (native) applications somehow get scaled
appropriately. However, the scaling-factor property in gsettings
is an integer and gets rounded down. So if I set display scaling
to 150% in the settings, it will still get rounded down to one,
leading to a wrong scaling for JavaFX applications. I would argue
that JavaFX applications not scaling correctly on KDE systems is
not a small issue as it makes some applications unusable unless
the developer add support for custom scaling explicitly. So I have
two questions:<br>
- Is the default dpi calculation also error prone? If not, why not
always use the manual calculation on KDE systems<br>
- Are there better alternatives to the gsettings scaling-factor?
Something like <code>org.gnome.desktop.interface
text-scaling-factor</code></p>
<div class="moz-cite-prefix">On 16/02/2024 21:31, Martin Fox wrote:<br>
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<blockquote type="cite"
cite="mid:3FDC27F8-0BD5-466F-B099-0100843974D3@martinfox.com">
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Hi Christopher,
<div><br>
</div>
<div>This may be a side-effect of using KDE. To determine the UI
scale the JavaFX code consults the “scaling-factor” setting in
the “org.gnome.desktop.interface” schema. You can check this on
the command line:</div>
<div><br>
</div>
<div><span class="Apple-tab-span" style="white-space:pre"> </span>gsettings
get org.gnome.desktop.interface scaling-factor</div>
<div><br>
</div>
<div>This should be 0 so JavaFX can compute the scale itself. If
it’s greater than 0 that’s the value JavaFX will use for the UI
scale.</div>
<div><br>
</div>
<div>It appears that a KDE install can set this value to 1. In my
case I started with the ARM version of Ubuntu server and then
installed KDE (kubuntu-desktop) and afterward the scaling-factor
was 1. This doesn’t happen when installing the standard GNOME
desktop.</div>
<div><br>
</div>
<div>Martin</div>
<div><br>
<div>
<blockquote type="cite">
<div>On Feb 13, 2024, at 2:13 AM, Christopher Schnick
<a class="moz-txt-link-rfc2396E" href="mailto:crschnick@xpipe.io"><crschnick@xpipe.io></a> wrote:</div>
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<p> Hello,</p>
<p>several users of our JavaFX applications have
reported that the UI scale is too small when the
physical and logical screen resolutions differ on
Linux. For example in this case</p>
<p><span id="cid:part1.NldnHeEq.shgAL10K@xpipe.io"><Screenshot_20240125_115224(1).png></span></p>
<p>there is an implicit scaling factor of 150% included
as the monitor is a 4k display but is using a lowered
resolution of 2560x1440. This is then further
stretched as the OS resolution is 1920x1080, but the
main problem is that the 150% factor is somehow not
getting picked up and JavaFX is treating this as a 4k
display, thus making everything too small. For now
these users can use <span
style="margin: 0px; padding: 0px; border: 0px; font-weight: 400; font-style: normal; font-family: "gg sans", "Noto Sans", "Helvetica Neue", Helvetica, Arial, sans-serif; font-size: 16px; vertical-align: baseline; outline: 0px; color: rgb(219, 222, 225); font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; white-space: break-spaces; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(49, 51, 56); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">-Dglass</span><span
style="margin: 0px; padding: 0px; border: 0px; font-weight: 400; font-style: normal; font-family: "gg sans", "Noto Sans", "Helvetica Neue", Helvetica, Arial, sans-serif; font-size: 16px; vertical-align: baseline; outline: 0px; color: rgb(219, 222, 225); font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; white-space: break-spaces; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(49, 51, 56); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">.gtk</span><span
style="margin: 0px; padding: 0px; border: 0px; font-weight: 400; font-style: normal; font-family: "gg sans", "Noto Sans", "Helvetica Neue", Helvetica, Arial, sans-serif; font-size: 16px; vertical-align: baseline; outline: 0px; color: rgb(219, 222, 225); font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; white-space: break-spaces; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(49, 51, 56); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">.uiScale</span><span
style="margin: 0px; padding: 0px; border: 0px; font-weight: 400; font-style: normal; font-family: "gg sans", "Noto Sans", "Helvetica Neue", Helvetica, Arial, sans-serif; font-size: 16px; vertical-align: baseline; outline: 0px; color: rgb(219, 222, 225); font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; white-space: break-spaces; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(49, 51, 56); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">=</span>1.5
but that is not a nice solution to this problem.<br>
</p>
<p>Best<br>
Christopher Schnick<br>
</p>
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