/usr/share/xscreensaver/config/ifs.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 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="ifs" _label="IFS">
<command arg="-root"/>
<number id="delay" type="slider" arg="-delay %"
_label="Frame rate" _low-label="Low" _high-label="High"
low="0" high="100000" default="20000"
convert="invert"/>
<number id="functions" type="slider" arg="-functions %"
_label="Number of functions" _low-label="2" _high-label="6"
low="2" high="6" default="3"/>
<number id="detail" type="slider" arg="-detail %"
_label="Detail" _low-label="Low" _high-label="High"
low="4" high="14" default="9"/>
<!--
On a 2.93 gHz iMac i7, I get these rates with -delay 0:
detail 3: invisible
detail 4: barely visible
detail 5: 1000+ fps, looks like noise at -delay 0, ok at -delay 20000
detail 8: ~700+ fps
detail 9: ~400 fps
detail 10: ~300 fps
detail 11: ~100 fps
detail 12: ~50 fps
detail 13: ~17 fps
detail 14: ~8 fps
detail 15: ~2 fps
With the default -delay, CPU load only starts causing the frame rate
to drop below 30 fps detail 12 or higher.
-->
<number id="colors" type="slider" arg="-colors %"
_label="Number of colors" _low-label="2" _high-label="Many"
low="2" high="255" default="200" />
<hgroup>
<boolean id="translate" _label="Translate" arg-unset="-no-translate"/>
<boolean id="scale" _label="Scale" arg-unset="-no-scale"/>
<boolean id="rotate" _label="Rotate" arg-unset="-no-rotate"/>
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
</hgroup>
<_description>
This one draws spinning, colliding iterated-function-system images.
Note that the "Detail" parameter is exponential. Number of points
drawn is functions^detail.
http://en.wikipedia.org/wiki/Iterated_function_system
Written by Chris Le Sueur and Robby Griffin; 1997.
</_description>
</screensaver>
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