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Gabriel Fontes
c9b492a141
Port material-colors 0.4.2 palettes: tonalPalette hue chroma -> tone(t) via the HCT solver (with the yellow tone-99 average quirk), corePalette (matugen's palettes field: primary max(48,chroma), sec 16, tert hue+60/24, neutral 4, neutral-variant 8, error 25/84), and rainbowPalettes (scheme palettes for the role layer: neutral/neutral-variant chroma 0). Validated: corePalette reproduces matugen's palettes JSON for #2B3975 bit-exact across all 6 palettes x 18 tones (108/108). Assisted-by: pi (opus-4.8)
67 lines
2.0 KiB
Nix
67 lines
2.0 KiB
Nix
# TonalPalette + the palette sets for a source color, ported from
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# material-colors 0.4.2 (the version matugen 4.0 pins).
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# - corePalette: matches matugen's `palettes` JSON output (CorePalette.of).
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# - rainbowPalettes: the rainbow *scheme* palettes, consumed by the role layer.
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{lib}: let
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h = import ./hct.nix {inherit lib;};
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m = import ./math.nix {inherit lib;};
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inherit (builtins) floor;
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isYellow = hue: hue >= 105.0 && hue < 125.0;
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sanitizeDeg = d: let r = m.fmod d 360.0; in
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if r < 0.0
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then r + 360.0
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else r;
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max = a: b:
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if a > b
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then a
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else b;
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# average two "#rrggbb" per channel (used for the yellow tone-99 quirk)
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averageHex = h1: h2: let
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a = h.hexToRgb h1;
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b = h.hexToRgb h2;
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avg = x: y: floor ((x + y) / 2.0 + 0.5);
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in
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h.rgbToHex {
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r = avg a.r b.r;
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g = avg a.g b.g;
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b = avg a.b b.b;
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};
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tonalPalette = hue: chroma: let
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toneOf = t:
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if t == 99 && isYellow hue
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then averageHex (toneOf 98) (toneOf 100)
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else h.hexFromHct {inherit hue chroma; tone = 1.0 * t;};
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in {
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inherit hue chroma;
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tone = toneOf;
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};
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in rec {
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inherit tonalPalette;
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# CorePalette.of(source) — matugen's `palettes` field
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corePalette = {hue, chroma}: {
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primary = tonalPalette hue (max 48.0 chroma);
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secondary = tonalPalette hue 16.0;
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tertiary = tonalPalette (sanitizeDeg (hue + 60.0)) 24.0;
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neutral = tonalPalette hue 4.0;
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neutral_variant = tonalPalette hue 8.0;
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error = tonalPalette 25.0 84.0;
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};
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# SchemeRainbow palettes — consumed by the DynamicColor role layer (brick 4)
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rainbowPalettes = {hue, chroma}: {
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primary = tonalPalette hue 48.0;
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secondary = tonalPalette hue 16.0;
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tertiary = tonalPalette (sanitizeDeg (hue + 60.0)) 24.0;
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neutral = tonalPalette hue 0.0;
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neutral_variant = tonalPalette hue 0.0;
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error = tonalPalette 25.0 84.0;
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};
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# convenience: dump a palette as { "<tone>" = "#hex"; ... } for given tones
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paletteTones = tones: pal: lib.listToAttrs (map (t: lib.nameValuePair (toString t) (pal.tone t)) tones);
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}
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