<?xml version="1.0" encoding="ISO-8859-1"?>

<screensaver name="droste" _label="Droste">

  <command arg="--root"/>

  <video href="https://www.youtube.com/watch?v=C0ZXw3gG70c"/>
<!-- <video href="https://www.youtube.com/watch?v=izM4ERr2aPw"/> -->
<!-- <video href="https://www.youtube.com/watch?v=yc94uzwNxdg"/> -->

  <hgroup>
   <vgroup>
    <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="duration" type="slider" arg="--duration %"
            _label="Duration" _low-label="10 seconds" _high-label="10 minutes"
            low="10" high="600" default="120"/>

    <xscreensaver-image />

   </vgroup>
   <vgroup>
    <number id="speed" type="slider" arg="--speed %"
            _label="Zoom speed" _low-label="Out" _high-label="In"
            low="-10.0" high="10.0" default="1.0"
            convert="ratio" />

    <number id="r1" type="slider" arg="--r1 %"
            _label="Radius One" _low-label="0.0" _high-label="1.0"
            low="0.0" high="1.0" default="0.2" />

    <number id="r2" type="slider" arg="--r2 %"
            _label="Radius Two" _low-label="0.0" _high-label="1.0"
            low="0.0" high="1.0" default="0.7" />

    <boolean id="showfps" _label="Show frame rate" arg-set="--fps"/>

    <xscreensaver-updater />

   </vgroup>
  </hgroup>

  <_description>
Mise en abyme: infinite spiral recursion within images.

https://en.wikipedia.org/wiki/Droste_effect
https://en.wikipedia.org/wiki/Maurits_Cornelis_Escher

Written by Jamie Zawinski; 2023.
  </_description>
</screensaver>
