/usr/share/xscreensaver/config/loop.xml is in xscreensaver-data-extra 5.36-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="loop" _label="Loop">
<command arg="-root"/>
<video href="https://www.youtube.com/watch?v=_kTMO7oEN8U"/>
<number id="delay" type="slider" arg="-delay %"
_label="Frame rate" _low-label="Low" _high-label="High"
low="0" high="200000" default="100000"
convert="invert"/>
<number id="cycles" type="slider" arg="-cycles %"
_label="Timeout" _low-label="Small" _high-label="Large"
low="0" high="8000" default="1600"/>
<number id="ncolors" type="slider" arg="-ncolors %"
_label="Number of colors" _low-label="Two" _high-label="Many"
low="1" high="255" default="15"/>
<number id="size" type="spinbutton" arg="-size %"
_label="Size" low="-50" high="50" default="-12"/>
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
<xscreensaver-updater />
<_description>
A cellular automaton that generates loop-shaped colonies that spawn,
age, and eventually die.
https://en.wikipedia.org/wiki/Langton%27s_loops
Written by David Bagley; 1999.
</_description>
</screensaver>
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