/usr/share/xscreensaver/config/goop.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="goop" _label="Goop">
<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="12000"
convert="invert"/>
<number id="torque" type="slider" arg="-torque %"
_label="Speed" _low-label="Slow" _high-label="Fast"
low="0.0002" high="0.0500" default="0.0075"/>
<number id="count" type="slider" arg="-planes %"
_label="Blobs" _low-label="Few" _high-label="Many"
low="1" high="50" default="12"/>
</vgroup>
<vgroup>
<number id="elasticity" type="slider" arg="-elasticity %"
_label="Elasticity" _low-label="Low" _high-label="High"
low="0.1" high="5.0" default="0.9"/>
<number id="maxv" type="slider" arg="-max-velocity %"
_label="Speed limit" _low-label="Low" _high-label="High"
low="0.1" high="3.0" default="0.5"/>
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
</vgroup>
</hgroup>
<hgroup>
<select id="mode">
<option id="transparent" _label="Transparent blobs"/>
<option id="opaque" _label="Opaque blobs" arg-set="-mode opaque"/>
<option id="xor" _label="XOR blobs" arg-set="-mode xor"/>
</select>
<select id="color-mode">
<option id="additive" _label="Additive colors (transmitted light)"/>
<option id="subtractive" _label="Subtractive colors (reflected light)"
arg-set="-subtractive"/>
</select>
</hgroup>
<_description>
This draws set of animating, transparent, amoeba-like blobs. The blobs
change shape as they wander around the screen, and they are translucent,
so you can see the lower blobs through the higher ones, and when one
passes over another, their colors merge. I got the idea for this from
a mouse pad I had once, which achieved the same kind of effect in real
life by having several layers of plastic with colored oil between them.
Written by Jamie Zawinski; 1997.
</_description>
</screensaver>
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