mirror of
https://github.com/Karaka-Management/phpOMS.git
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81 lines
1.8 KiB
PHP
81 lines
1.8 KiB
PHP
<?php
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/**
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* Karaka
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*
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* PHP Version 8.0
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*
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* @package phpOMS\Utils
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* @copyright Dennis Eichhorn
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* @license OMS License 1.0
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* @version 1.0.0
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* @link https://karaka.app
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*/
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declare(strict_types=1);
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namespace phpOMS\Utils;
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/**
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* Image utils class.
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*
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* This class provides static helper functionalities for images.
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*
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* @package phpOMS\Utils
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* @license OMS License 1.0
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* @link https://karaka.app
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* @since 1.0.0
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*/
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final class ImageUtils
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{
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/**
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* Constructor.
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*
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* @since 1.0.0
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* @codeCoverageIgnore
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*/
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private function __construct()
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{
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}
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/**
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* Decode base64 image.
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*
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* @param string $img Encoded image
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*
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* @return string Decoded image
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*
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* @since 1.0.0
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*/
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public static function decodeBase64Image(string $img) : string
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{
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$img = \str_replace('data:image/png;base64,', '', $img);
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$img = \str_replace(' ', '+', $img);
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return (string) \base64_decode($img);
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}
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public static function lightness(int $rgb) : float
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{
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$sR = ($rgb >> 16) & 0xFF;
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$sG = ($rgb >> 8) & 0xFF;
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$sB = $rgb & 0xFF;
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return self::lightnessFromRgb($sR, $sG, $sB);
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}
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public static function lightnessFromRgb(int $r, int $g, int $b) : float
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{
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$vR = $r / 255;
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$vG = $g / 255;
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$vB = $b / 255;
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$lR = $vR <= 0.04045 ? $vR / 12.92 : \pow((($vR + 0.055) / 1.055), 2.4);
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$lG = $vG <= 0.04045 ? $vG / 12.92 : \pow((($vG + 0.055) / 1.055), 2.4);
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$lB = $vB <= 0.04045 ? $vB / 12.92 : \pow((($vB + 0.055) / 1.055), 2.4);
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$y = 0.2126 * $lR + 0.7152 * $lG + 0.0722 * $lB;
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$lStar = $y <= 216 / 24389 ? $y * 24389 / 27 : \pow($y,(1 / 3)) * 116 - 16;
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return $lStar / 100;
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}
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}
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