/usr/share/xscreensaver/config/imsmap.xml is in xscreensaver-data-extra 5.15-2ubuntu1.
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 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="imsmap" _label="IMSMap">
<command arg="-root"/>
<number id="delay2" type="slider" arg="-delay2 %"
_label="Frame rate" _low-label="Low" _high-label="High"
low="0" high="100000" default="20000"
convert="invert"/>
<number id="delay" type="slider" arg="-delay %"
_label="Linger" _low-label="1 Second" _high-label="1 Minute"
low="1" high="60" default="5"/>
<number id="iterations" type="slider" arg="-iterations %"
_label="Density" _low-label="Sparse" _high-label="Dense"
low="1" high="7" default="7"/>
<number id="ncolors" type="slider" arg="-ncolors %"
_label="Number of colors" _low-label="Two" _high-label="Many"
low="1" high="255" default="50"/>
<select id="mode">
<option id="random" _label="Random coloration"/>
<option id="h" _label="Hue gradients" arg-set="-mode h"/>
<option id="s" _label="Saturation gradients" arg-set="-mode s"/>
<option id="v" _label="Brightness gradients" arg-set="-mode v"/>
</select>
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
<_description>
This generates random cloud-like patterns. The idea is to take four
points on the edge of the image, and assign each a random "elevation".
Then find the point between them, and give it a value which is the
average of the other four, plus some small random offset.
Coloration is done based on elevation.
Written by Juergen Nickelsen and Jamie Zawinski; 1992.
</_description>
</screensaver>
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