Zabbix

<?php

/*

** Zabbix

** Copyright (C) 2001-2022 Zabbix SIA

**

** This program is free software; you can redistribute it and/or modify

** it under the terms of the GNU General Public License as published by

** the Free Software Foundation; either version 2 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 General Public License for more details.

**

** You should have received a copy of the GNU General Public License

** along with this program; if not, write to the Free Software

** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

**/

​

/**

 * Helper for image related operations.

 */

class CImageHelper {

​

    /**

     * Image compare threshold.

     *

     * @var integer

     */

    protected static $threshold = 0;

​

    /**

     * Default color used to erase regions.

     *

     * @var array

     */

    protected static $erase_color = [255, 0, 255];

​

    /**

     * Get image resource from image data string.

     *

     * @param string $data    image data string

     *

     * @return resource

     *

     * @throws Exception    on error

     */

    public static function getImageResource($data) {

        $image = @imagecreatefromstring($data);

        if ($image === false) {

            throw new Exception('Failed to load image.');

        }

​

        return $image;

    }

​

    /**

     * Get image data string from image resource.

     *

     * @param resource $image    image resource

     *

     * @return string