3 +--------------------------------------------------------------------+
5 +--------------------------------------------------------------------+
6 | Copyright CiviCRM LLC (c) 2004-2018 |
7 +--------------------------------------------------------------------+
8 | This file is a part of CiviCRM. |
10 | CiviCRM is free software; you can copy, modify, and distribute it |
11 | under the terms of the GNU Affero General Public License |
12 | Version 3, 19 November 2007 and the CiviCRM Licensing Exception. |
14 | CiviCRM is distributed in the hope that it will be useful, but |
15 | WITHOUT ANY WARRANTY; without even the implied warranty of |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
17 | See the GNU Affero General Public License for more details. |
19 | You should have received a copy of the GNU Affero General Public |
20 | License and the CiviCRM Licensing Exception along |
21 | with this program; if not, contact CiviCRM LLC |
22 | at info[AT]civicrm[DOT]org. If you have questions about the |
23 | GNU Affero General Public License or the licensing of CiviCRM, |
24 | see the CiviCRM license FAQ at http://civicrm.org/licensing |
25 +--------------------------------------------------------------------+
31 * @copyright CiviCRM LLC (c) 2004-2018
35 * Static utility functions for working with colors
37 class CRM_Utils_Color
{
40 * Determine the appropriate text color for a given background.
44 * @param string $hexcolor
47 public static function getContrast($hexcolor) {
48 $hexcolor = trim($hexcolor, ' #');
49 $r = hexdec(substr($hexcolor, 0, 2));
50 $g = hexdec(substr($hexcolor, 2, 2));
51 $b = hexdec(substr($hexcolor, 4, 2));
52 $yiq = (($r * 299) +
($g * 587) +
($b * 114)) / 1000;
53 return ($yiq >= 128) ?
'black' : 'white';