/usr/share/xscreensaver/config/blitspin.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 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="blitspin" _label="BlitSpin">
<command arg="-root"/>
<video href="https://www.youtube.com/watch?v=UTtcwb-UWW8"/>
<hgroup>
<vgroup>
<number id="delay" type="slider" arg="-delay %"
_label="Fuzzy rotation speed" _low-label="Slow" _high-label="Fast"
low="1" high="800000" default="500000"
convert="invert"/>
<number id="delay2" type="slider" arg="-delay2 %"
_label="90 degree rotation speed" _low-label="Slow" _high-label="Fast"
low="1" high="800000" default="500000"
convert="invert"/>
<number id="duration" type="slider" arg="-duration %"
_label="Duration" _low-label="10 seconds" _high-label="10 minutes"
low="10" high="600" default="120"/>
</vgroup>
<vgroup>
<!-- <file id="bitmap" _label="Bitmap to rotate" arg="-bitmap %"/> -->
<xscreensaver-image />
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
</vgroup>
</hgroup>
<xscreensaver-updater />
<_description>
Repeatedly rotates a bitmap by 90 degrees by using logical operations:
the bitmap is divided into quadrants, and the quadrants are shifted
clockwise. Then the same thing is done again with progressively
smaller quadrants, except that all sub-quadrants of a given size are
rotated in parallel. As you watch it, the image appears to dissolve
into static and then reconstitute itself, but rotated.
Written by Jamie Zawinski; 1992.
</_description>
</screensaver>
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