nx_contrast.nx

buildroot/runtime/_hdl_build/nx_contrast.nx

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docs dependencies structs consts functions

about

nx_contrast.nx -- SOVEREIGN WCAG 2.1 + APCA contrast CLI. ★CONSOLIDATED 2026-07-21: the luminance/contrast/APCA KERNEL now lives in nx_uiq_color (the ONE family contrast kernel); this is a THIN CLI over it (OO consolidation, D001 migrate-on-touch). The duplicate srgb_lin/lum/ratio100/apca_* that used to live here are DELETED -> no behaviour lost, one source of truth. Behaviour-preserving, PROVEN by --kat reproducing the reference values (21.00 / 4.54 / APCA 106.0 / -107.9 / 63.1). usage: nx_contrast <fg-hex> <bg-hex> e.g. nx_contrast 767676 ffffff | nx_contrast "#000" "#fff" emits JSON: {"fg","bg","ratio","aa","aaa","aa_large","apca_lc"} | --kat runs the reference battery license_tier: ORIGINAL genealogy: w3.org/TR/WCAG21 relative-luminance + contrast-ratio

dependencies 1 imports · 0 importers

imports: nx_uiq_color.nx

imported by: nobody (leaf or entry point)

call flow from main pre-order; caps 40 nodes / depth 6 declared; ↻ = already shown

structs

none

consts

10	const K_MAGIC_2100: i64 = 2100
11	const K_MAGIC_1050: i64 = 1050
12	const K_MAGIC_1070: i64 = 1070
13	const K_MAGIC_1090: i64 = 1090

functions

16	func parse_hex(s: u8, out: i64) -> i64 called by 1: main calls 1: uiq_hxn
24	func pbool(b: i64) -> i64 { if b==1 { uiq_w("true" as u8) } else { uiq_w("false" as u8) } return 0 } called by 1: main calls 1: uiq_w
25	func papca(v: i64) -> i64 called by 2: run_kat main calls 2: uiq_w uiq_pn
32	func run_kat() -> i64 called by 1: main calls 6: uiq_w uiq_ratio100 uiq_pratio uiq_apca_lc10 papca uiq_pn
63	func main(argc: i64, argv: *i64) -> i64 calls 8: run_kat uiq_w parse_hex uiq_ratio100 uiq_pratio pbool+2