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Desktop Environments (DE)/Window Managers (WM): XScreenSaver 6.13 and some things on X11's obscure DirectColor visual type
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Jamie Zawinski ☛ XScreenSaver 6.13
XScreenSaver 6.13 is out now, including iOS and Android.
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University of Toronto ☛ Some things on X11's obscure DirectColor visual type
The X Window System has a long standing concept called 'visuals'; to simplify, an X visual determines how to determine the colors of your pixels. As I wrote about a number of years ago, these days X11 mostly uses 'TrueColor' visuals, which directly supply 8-bit values for red, green, and blue ('24-bit color'). However X11 has a number of visual types, such as the straightforward PseudoColor indirect colormap (where every pixel value is an index into an RGB colormap; typically you'd get 8-bit pixels and 24-bit colormaps, so you could have 256 colors out of a full 24-bit gamut). One of the (now) obscure visual types is DirectColor. To quote: [...]