File odules/qrcode/admin/index.php

 1: <?php
 2: /*
 3:  You may not change or alter any portion of this comment or credits
 4:  of supporting developers from this source code or any supporting source code
 5:  which is considered copyrighted (c) material of the original comment or credit authors.
 6: 
 7:  This program is distributed in the hope that it will be useful,
 8:  but WITHOUT ANY WARRANTY; without even the implied warranty of
 9:  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
10: */
11: 
12: /**
13:  * qrcode module
14:  *
15:  * @copyright XOOPS Project (http://xoops.org)
16:  * @license   GNU GPL 2 or later (http://www.gnu.org/licenses/gpl-2.0.html)
17:  * @package   qrcode
18:  * @since     2.6.0
19:  * @author    Mage Grégory (AKA Mage)
20:  */
21: include __DIR__ . '/header.php';
22: 
23: $xoops = Xoops::getInstance();
24: 
25: $xoops->header();
26: 
27: $admin_page = new \Xoops\Module\Admin();
28: $admin_page->displayNavigation('index.php');
29: 
30: $bg = $xoops->getModuleConfig('qrcode_bgcolor', 'qrcode');
31: $bg = getBrightness($bg);
32: 
33: $fg = $xoops->getModuleConfig('qrcode_fgcolor', 'qrcode');
34: $fg = getBrightness($fg);
35: 
36: $contrastMessage = _MI_QRCODE_CONTRAST_OK;
37: $contrastStatus = 'accept';
38: 
39: if ($bg < $fg) { // inverse (light cells on dark backgound) does not work on many readers
40:     $contrastMessage = _MI_QRCODE_CONTRAST_INVERSE;
41:     $contrastStatus = 'error';
42: } elseif (($bg-$fg) < 100) {
43:     $contrastMessage = _MI_QRCODE_CONTRAST_ERROR;
44:     $contrastStatus = 'error';
45: }
46: $admin_page->addConfigBoxLine($contrastMessage, $contrastStatus);
47: $admin_page->displayIndex();
48: 
49: $xoops->footer();
50: 
51: /**
52:  * getBrightness get brightness of a color
53:  *
54:  * @param string $color 24 bit RGB color as hex digit (i.e. 'FFFFFF')
55:  *
56:  * @return int relative brightness of color 1-255001
57:  */
58: function getBrightness($color)
59: {
60:     $rgb = normalizeColor($color);
61:     //$brightness = ($rgb['r']*299 + $rgb['g']*587 + $rgb['b']*114) / 1000;
62:     // luminosity is L = 0.2126 * R + 0.7152 * G + 0.0722.
63:     $brightness = ($rgb['r']*0.2126 + $rgb['g']*0.7152 + $rgb['b']*0.0722);
64:     return $brightness + 0.00001; // no zero
65: }
66: 
67: /**
68:  * normalizeColor
69:  *
70:  * @param string $color 24 bit RGB color as hex digit (i.e. 'FFFFFF')
71:  *
72:  * @return array of ints, RGB color values keyed as 'red', 'green' and 'blue'
73:  */
74: function normalizeColor($color)
75: {
76:     $color = preg_replace('/[^a-fA-F0-9]+/', '', $color); // only hex digits
77:     $color = substr('000000'.$color, -6); // only 6 digits, pad with leading zeros
78:     $rgb = array(
79:         'r' => hexdec(substr($color, 0, 2)),
80:         'g' => hexdec(substr($color, 2, 2)),
81:         'b' => hexdec(substr($color, 4, 2)),
82:     );
83:     return $rgb;
84: }
85:
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