/usr/share/xscreensaver/config/munch.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 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="munch" _label="Munch">
<command arg="-root"/>
<video href="https://www.youtube.com/watch?v=aXNIYpdh8Ug"/>
<hgroup>
<vgroup>
<number id="delay" type="slider" arg="-delay %"
_label="Frame rate" _low-label="Low" _high-label="High"
low="0" high="100000" default="10000"
convert="invert"/>
<number id="duration" type="slider" arg="-clear %"
_label="Duration" _low-label="Short" _high-label="Long"
low="1" high="200" default="65"/>
<number id="simultaneous" type="slider" arg="-simul %"
_label="Simultaneous squares" _low-label="One" _high-label="Many"
low="1" high="20" default="5"/>
</vgroup>
<vgroup>
<select id="mismunch">
<option id="random" _label="Munch or mismunch"/>
<option id="munch" _label="Munch only" arg-set="-classic"/>
<option id="mismunch" _label="Mismunch only" arg-set="-mismunch"/>
</select>
<select id="mode">
<option id="xor" _label="XOR"/>
<option id="solid" _label="Solid" arg-set="-no-xor"/>
</select>
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
<xscreensaver-updater />
</vgroup>
</hgroup>
<_description>
DATAI 2
ADDB 1,2
ROTC 2,-22
XOR 1,2
JRST .-4
As reported by HAKMEM (MIT AI Memo 239, 1972), Jackson Wright wrote
the above PDP-1 code in 1962. That code still lives on here, some 46
years later.
In "mismunch" mode, it displays a creatively broken misimplementation
of the classic munching squares algorithm instead.
https://en.wikipedia.org/wiki/HAKMEM
https://en.wikipedia.org/wiki/Munching_square
Written by Jackson Wright, Tim Showalter, Jamie Zawinski and
Steven Hazel; 1997.
</_description>
</screensaver>
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