kde-gtk-hidpi.sh

#!/bin/sh
#/etc/X11/xinit/xinitrc.d/kde-gtk-hidpi.sh
#dependencies: crudini, xsettingsd

if [ "z$XDG_SESSION_DESKTOP" = "zKDE" ]
then
    ScaleFactor=$(crudini --get $HOME/.config/kdeglobals KScreen ScaleFactor || echo 1)
    export GDK_SCALE=$ScaleFactor
    export GDK_DPI_SCALE=$(echo "scale=1;1/$ScaleFactor"|bc|sed 's/^\./0./')
    smallSize=$(printf %.0f $(echo "scale=0;12*$ScaleFactor"|bc))
    bigSize=$(printf %.0f $(echo "scale=0;20*$ScaleFactor"|bc))
    xsettingsd_conf="/run/user/$UID/xsettingsd.conf"
    xsettingsd_log="/run/user/$UID/xsettingsd.log"
    echo "Gtk/IconSizes \"panel-menu=$bigSize,$bigSize:panel=$bigSize,$bigSize:gtk-menu=$smallSize,$smallSize:gtk-large-toolbar=$bigSize,$bigSize:gtk-small-toolbar=$bigSize,$bigSize:gtk-button=$smallSize,$smallSize\"" > $xsettingsd_conf
    nohup xsettingsd -c $xsettingsd_conf >$xsettingsd_log 2>&1 &
fi