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comparison plugins/identicon/identicon_engine.php @ 0:1e000243b222

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vanilla 1.3.3 distro, I hope
author Charlie Root
date Thu, 04 Jan 2018 15:50:29 -0500
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-1:000000000000 0:1e000243b222
1 <?php
2
3 /**
4 * @license GNU GPLv3+
5 * @author Aleksander Machniak <alec@alec.pl>
6 */
7 class identicon_engine
8 {
9 private $ident;
10 private $width;
11 private $height;
12 private $margin;
13 private $binary;
14 private $color;
15 private $bgcolor = '#F9F9F9';
16 private $mimetype = 'image/png';
17 private $palette = array(
18 '#F44336', '#E91E63', '#9C27B0', '#673AB7', '#3F51B5', '#2196F3',
19 '#03A9F4', '#00BCD4', '#009688', '#4CAF50', '#8BC34A', '#CDDC39',
20 '#FFEB3B', '#FFC107', '#FF9800', '#FF5722', '#795548', '#607D8B',
21 );
22 private $grid = array(
23 0, 1, 2, 1, 0,
24 3, 4, 5, 4, 3,
25 6, 7, 8, 7, 6,
26 9, 10, 11, 10, 9,
27 12, 13, 14, 13, 12,
28 );
29
30 const GRID_SIZE = 5;
31 const ICON_SIZE = 150;
32
33
34 /**
35 * Class constructor
36 *
37 * @param string $ident Unique identifier (email address)
38 * @param int $size Icon size in pixels
39 */
40 public function __construct($ident, $size = null)
41 {
42 if (!$size) {
43 $size = self::ICON_SIZE;
44 }
45
46 $this->ident = $ident;
47 $this->margin = (int) round($size / 10);
48 $this->width = (int) round(($size - $this->margin * 2) / self::GRID_SIZE) * self::GRID_SIZE + $this->margin * 2;
49 $this->height = $this->width;
50
51 $this->generate();
52 }
53
54 /**
55 * Returns image mimetype
56 */
57 public function getMimetype()
58 {
59 return $this->mimetype;
60 }
61
62 /**
63 * Returns the image in binary form
64 */
65 public function getBinary()
66 {
67 return $this->binary;
68 }
69
70 /**
71 * Sends the image to the browser
72 */
73 public function sendOutput()
74 {
75 if ($this->binary) {
76 $rcmail = rcmail::get_instance();
77 $rcmail->output->future_expire_header(10 * 60);
78
79 header('Content-Type: ' . $this->mimetype);
80 header('Content-Size: ' . strlen($this->binary));
81 echo $this->binary;
82
83 return true;
84 }
85
86 return false;
87 }
88
89 /**
90 * Icon generator
91 */
92 private function generate()
93 {
94 $ident = md5($this->ident, true);
95
96 // set icon color
97 $div = intval(255/count($this->palette));
98 $index = intval(ord($ident[0]) / $div);
99 $this->color = $this->palette[$index] ?: $this->palette[0];
100
101 // set cell size
102 $cell_width = ($this->width - $this->margin * 2) / self::GRID_SIZE;
103 $cell_height = ($this->height - $this->margin * 2) / self::GRID_SIZE;
104
105 // create a grid
106 foreach ($this->grid as $i => $idx) {
107 $row_num = intval($i / self::GRID_SIZE);
108 $cell_num_h = $i - $row_num * self::GRID_SIZE;
109
110 $this->grid[$i] = array(
111 'active' => ord($ident[$idx]) % 2 > 0,
112 'x1' => $cell_width * $cell_num_h + $this->margin,
113 'y1' => $cell_height * $row_num + $this->margin,
114 'x2' => $cell_width * ($cell_num_h + 1) + $this->margin,
115 'y2' => $cell_height * ($row_num + 1) + $this->margin,
116 );
117 }
118
119 // really generate the image using supported methods
120 if (function_exists('imagepng')) {
121 $this->generateGD();
122 }
123 else {
124 // log an error
125 $error = array(
126 'code' => 500,
127 'message' => "PHP-GD module not found. It's required by identicon plugin.",
128 );
129
130 rcube::raise_error($error, true, false);
131 }
132 }
133
134 /**
135 * GD-based icon generation worker
136 */
137 private function generateGD()
138 {
139 $color = $this->toRGB($this->color);
140 $bgcolor = $this->toRGB($this->bgcolor);
141
142 // create an image, setup colors
143 $image = imagecreate($this->width, $this->height);
144 $color = imagecolorallocate($image, $color[0], $color[1], $color[2]);
145 $bgcolor = imagecolorallocate($image, $bgcolor[0], $bgcolor[1], $bgcolor[2]);
146
147 imagefilledrectangle($image, 0, 0, $this->width, $this->height, $bgcolor);
148
149 // draw the grid created in self::generate()
150 foreach ($this->grid as $item) {
151 if ($item['active']) {
152 imagefilledrectangle($image, $item['x1'], $item['y1'], $item['x2'], $item['y2'], $color);
153 }
154 }
155
156 // generate an image and save it to a variable
157 ob_start();
158 imagepng($image, null, 6, PNG_ALL_FILTERS);
159 $this->binary = ob_get_contents();
160 ob_end_clean();
161
162 // cleanup
163 imagedestroy($image);
164 }
165
166 /**
167 * Convert #FFFFFF color format to 3-value RGB
168 */
169 private function toRGB($color)
170 {
171 preg_match('/^#?([A-F0-9]{2})([A-F0-9]{2})([A-F0-9]{2})/i', $color, $m);
172
173 return array(hexdec($m[1]), hexdec($m[2]), hexdec($m[3]));
174 }
175 }