gbos.git/usr/ansi.c, branch master gbos - a tiny Unix-flavored OS for the Game Boy Color (kernel, shell, coreutils in C, RAM filesystem) https://git.sl0p.foo/gbos.git/atom/usr/ansi.c?h=master 2026-07-18T18:41:27Z term: 7-color terminal (per-glyph fg+bg) + ANSI escapes; colorize irc 2026-07-18T18:41:27Z user user@clank 2026-07-18T18:41:27Z urn:sha1:9e7d5f6e5e01b7473b84bc3449d7f8e0f78e7045 Fano-plane palette scheme: the 7 colors map onto 7 CGB BG palettes so any color pair shares one palette; a tile's palette is picked from the set of colors its two cells need (tables generated by tools/gencolor.py). Per cell a packed (bg<<4)|fg byte lives alongside the char shadow, and the glyph blitter steers glyph/empty pixels to each cell's fg/bg color slots via plane masks. An ANSI-ish CSI parser (ESC [ .. m) drives it; usr/ansi.c demos it and the irc client now renders hashed nick colors, status dimming and a channel-activity bar.