/usr/share/xscreensaver/config/halftone.xml is in xscreensaver-data-extra 5.15-3ubuntu1.
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 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="halftone" _label="Halftone">
<command arg="-root"/>
<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="count" type="slider" arg="-count %"
_label="Gravity points" _low-label="Few" _high-label="Many"
low="1" high="50" default="10"/>
<number id="size" type="slider" arg="-spacing %"
_label="Dot size" _low-label="Small" _high-label="Big"
low="2" high="50" default="14"/>
<number id="dotfill" type="slider" arg="-sizefactor %"
_label="Dot fill factor" _low-label="Small" _high-label="Large"
low="0.1" high="3" default="1.5"/>
</vgroup>
<vgroup>
<number id="minspeed" type="slider" arg="-minspeed %"
_label="Minimum speed" _low-label="Low" _high-label="High"
low="0.001" high="0.09" default="0.001"/>
<number id="maxspeed" type="slider" arg="-maxspeed %"
_label="Maximum speed" _low-label="Low" _high-label="High"
low="0.001" high="0.09" default="0.02"/>
<number id="minmass" type="slider" arg="-minmass %"
_label="Minimum mass" _low-label="Small" _high-label="Large"
low="0.001" high="0.09" default="0.001"/>
<number id="maxmass" type="slider" arg="-maxmass %"
_label="Maximum mass" _low-label="Small" _high-label="Large"
low="0.001" high="0.09" default="0.02"/>
</vgroup>
</hgroup>
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
<_description>
Draws the gravity force in each point on the screen seen through a
halftone dot pattern. The gravity force is calculated from a set of
moving mass points. View it from a distance for best effect.
http://en.wikipedia.org/wiki/Halftone
Written by Peter Jaric; 2002.
</_description>
</screensaver>
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