/usr/share/xscreensaver/config/thornbird.xml is in xscreensaver-data-extra 5.34-2ubuntu1.
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 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="thornbird" _label="Thornbird">
<command arg="-root"/>
<video href="http://www.youtube.com/watch?v=rfGfPezVnac"/>
<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="Points" _low-label="Few" _high-label="Many"
low="10" high="1000" default="100"/>
<number id="cycles" type="slider" arg="-cycles %"
_label="Thickness" _low-label="Thin" _high-label="Thick"
low="2" high="1000" default="400"/>
<!--
<number id="ncolors" type="slider" arg="-ncolors %"
_label="Number of colors" _low-label="Two" _high-label="Many"
low="2" high="255" default="64"/>
-->
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
<xscreensaver-updater />
<_description>
Displays a view of the "Bird in a Thornbush" fractal.
Written by Tim Auckland; 2002.
</_description>
</screensaver>
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