/**

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* Get luminance from a HEX color.

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*

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* @param {string} hex - The hex color.

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*

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* @return {number} - Returns the luminance, number between 0 and 255.

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*/

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function twentytwentyoneGetHexLum( hex ) { // jshint ignore:line

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var rgb = twentytwentyoneGetRgbFromHex( hex );

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return Math.round( ( 0.2126 * rgb.r ) + ( 0.7152 * rgb.g ) + ( 0.0722 * rgb.b ) );

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}

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/**

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* Get RGB from HEX.

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*

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* @param {string} hex - The hex color.

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*

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* @return {Object} - Returns an object {r, g, b}

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*/

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function twentytwentyoneGetRgbFromHex( hex ) {

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var shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i,

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result;

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// Expand shorthand form (e.g. "03F") to full form (e.g. "0033FF").

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hex = hex.replace( shorthandRegex, function( m, r, g, b ) {

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return r.toString() + r.toString() + g.toString() + g.toString() + b.toString() + b.toString();

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} );

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result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec( hex );

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return result ? {

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r: parseInt( result[1], 16 ),

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g: parseInt( result[2], 16 ),

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b: parseInt( result[3], 16 )

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} : null;

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}

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