/usr/share/applications/screensavers/tessellimage.desktop is in xscreensaver-data 5.36-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Name=Tessellimage
Exec=/usr/lib/xscreensaver/tessellimage -root
TryExec=/usr/lib/xscreensaver/tessellimage
Comment=Converts an image to triangles using Delaunay tessellation, and animates the result at various depths. More triangles are allocated to visually complex parts of the image. This is accomplished by first computing the first derivative of the image: the distance between each pixel and its neighbors (which is essentially edge detection or embossing). Then the Delaunay control points are chosen by selecting those pixels whose distance value is above a certain threshold: those are the pixels that have the largest change in color/brightness. http://en.wikipedia.org/wiki/Delaunay_triangulation Written by Jamie Zawinski.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;
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