@eightshift/frontend-libs
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A collection of useful frontend utility modules. powered by Eightshift
32 lines (27 loc) • 938 B
JavaScript
import { hexToRgb } from '../editor';
/**
* Calculates the luminance of a given color, useful for calculating contrast ratios.
*
* @param {Number} r Red component of the color (0 - 255).
* @param {Number} g Green component of the color (0 - 255).
* @param {Number} b Blue component of the color (0 - 255).
*
* @returns Luminance of the color (0 - 1).
*/
export const luminanceFromRgb = (r, g, b) => {
const a = [r, g, b].map((rawValue) => {
const v = rawValue / 255;
return v <= 0.03928 ? v / 12.92 : Math.pow((v + 0.055) / 1.055, 2.4);
});
return a[0] * 0.2126 + a[1] * 0.7152 + a[2] * 0.0722;
};
/**
* Calculates the luminance of a given hex color, useful for calculating contrast ratios.
*
* @param {string} color Hex color to calculate the luminance from.
*
* @returns Luminance of the color (0 - 1).
*/
export const luminanceFromHex = (color) => {
return luminanceFromRgb(...hexToRgb(color).split(' '));
};