43 lines
924 B
JavaScript
43 lines
924 B
JavaScript
/* eslint-disable no-bitwise */
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import { hsluvToHex } from 'hsluv';
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//
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// github.com/sindresorhus/fnv1a
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//
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const OFFSET_BASIS_32 = 2166136261;
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const fnv1a = string => {
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let hash = OFFSET_BASIS_32;
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for (let i = 0; i < string.length; i++) {
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hash ^= string.charCodeAt(i);
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// 32-bit FNV prime: 2**24 + 2**8 + 0x93 = 16777619
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// Using bitshift for accuracy and performance. Numbers in JS suck.
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hash +=
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(hash << 1) + (hash << 4) + (hash << 7) + (hash << 8) + (hash << 24);
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}
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return hash >>> 0;
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};
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const colors = [];
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for (let i = 0; i < 72; i++) {
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colors[i] = hsluvToHex([i * 5, 40, 50]);
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colors[i + 72] = hsluvToHex([i * 5, 70, 50]);
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colors[i + 144] = hsluvToHex([i * 5, 100, 50]);
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}
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const cache = {};
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export default function stringToRGB(str) {
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if (cache[str]) {
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return cache[str];
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}
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const color = colors[fnv1a(str) % colors.length];
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cache[str] = color;
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return color;
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}
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