* * @author Julius Haertl * * @license GNU AGPL version 3 or any later version * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as * published by the Free Software Foundation, either version 3 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see . * */ namespace OCA\Theming; class Util { /** * @param string $color rgb color value * @return bool */ public function invertTextColor($color) { $l = $this->calculateLuminance($color); if($l>0.5) { return true; } else { return false; } } /** * get color for on-page elements: * theme color by default, grey if theme color is to bright * @param $color * @return string */ public function elementColor($color) { $l = $this->calculateLuminance($color); if($l>0.8) { return '#555555'; } else { return $color; } } /** * @param string $color rgb color value * @return float */ public function calculateLuminance($color) { $hex = preg_replace("/[^0-9A-Fa-f]/", '', $color); if (strlen($hex) === 3) { $hex = $hex{0} . $hex{0} . $hex{1} . $hex{1} . $hex{2} . $hex{2}; } if (strlen($hex) !== 6) { return 0; } $r = hexdec(substr($hex, 0, 2)); $g = hexdec(substr($hex, 2, 2)); $b = hexdec(substr($hex, 4, 2)); return (0.299 * $r + 0.587 * $g + 0.114 * $b)/255; } /** * @param $color * @return string base64 encoded radio button svg */ public function generateRadioButton($color) { $radioButtonIcon = ''; return base64_encode($radioButtonIcon); } }