96 lines
2.4 KiB
TypeScript
96 lines
2.4 KiB
TypeScript
import {hashSha256} from "./text.js";
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/** Return a hex color based on a hash of the input string. */
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export async function getColorFromStringHash(input: string): Promise<string> {
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const hash = Number.parseInt(await hashSha256(input), 16);
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const color = Math.abs(hash % 0xff_ff_ff).toString(16);
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return `#${color}`.padEnd(7, "0");
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}
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/** Returns whether a hex color is "bright". */
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export function isColorBright(color: string): boolean {
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if (color.startsWith("#")) {
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color = color.slice(1);
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}
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// 4 character hex colors have an alpha value, we only need RGB here so remove
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// the alpha character.
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if (color.length === 4) {
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color = color.slice(0, 3);
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}
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// 8 character hex colors also have an alpha value, so remove the last 2.
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if (color.length === 8) {
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color = color.slice(0, 6);
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}
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// 3 character hex colors can be represented as 6 character ones too, so
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// transform it. For example "#123" is the same as "#112233".
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if (color.length === 3) {
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color = color
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.split("")
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.map((value) => value.repeat(2))
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.join("");
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}
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// Split the color up into 3 segments of 2 characters and convert them from
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// hexadecimal to decimal.
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const [red, green, blue] = color
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.split(/(.{2})/)
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.filter((value) => value !== "")
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.map((value) => Number.parseInt(value, 16));
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// Magical numbers taken from https://stackoverflow.com/a/12043228/12251171.
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// "Per ITU-R BT.709"
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const brightness = 0.2126 * red + 0.7152 * green + 0.0722 * blue;
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return brightness > 128;
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}
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/** CSS custom properties from the Tildes themes. */
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export const themeColors = [
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{
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name: "Background Primary",
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value: "--background-primary-color",
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},
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{
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name: "Background Secondary",
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value: "--background-secondary-color",
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},
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{
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name: "Foreground Primary",
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value: "--foreground-primary-color",
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},
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{
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name: "Foreground Secondary",
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value: "--foreground-secondary-color",
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},
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{
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name: "Exemplary",
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value: "--comment-label-exemplary-color",
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},
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{
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name: "Off-topic",
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value: "--comment-label-offtopic-color",
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},
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{
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name: "Joke",
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value: "--comment-label-joke-color",
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},
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{
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name: "Noise",
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value: "--comment-label-noise-color",
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},
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{
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name: "Malice",
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value: "--comment-label-malice-color",
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},
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{
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name: "Mine",
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value: "--stripe-mine-color",
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},
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{
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name: "Official",
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value: "--alert-color",
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},
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];
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