1: <?php
 2: /**
 3:  * Image effect for watermarking images with text for the im driver..
 4:  *
 5:  * Copyright 2007-2012 Horde LLC (http://www.horde.org/)
 6:  *
 7:  * @author  Michael J. Rubinsky <mrubinsk@horde.org>
 8:  * @package Image
 9:  */
10: class Horde_Image_Effect_Im_TextWatermark extends Horde_Image_Effect
11: {
12:     /**
13:      * Valid parameters for watermark effects:
14:      *
15:      *   text (required)  - The text of the watermark.
16:      *   halign           - The horizontal placement
17:      *   valign           - The vertical placement
18:      *   font             - The font name or family to use
19:      *   fontsize         - The size of the font to use
20:      *                      (small, medium, large, giant)
21:      *
22:      * @var array
23:      */
24:     protected $_params = array('halign' => 'right',
25:                                'valign' => 'bottom',
26:                                'font' => 'courier',
27:                                'fontsize' => 'small');
28: 
29:     /**
30:      * Add the watermark
31:      *
32:      */
33:     public function apply()
34:     {
35:         /* Determine placement on image */
36:         switch ($this->_params['valign']) {
37:         case 'bottom':
38:             $v = 'south';
39:             break;
40:         case 'center':
41:             $v = 'center';
42:             break;
43:         default:
44:             $v = 'north';
45:         }
46: 
47:         switch ($this->_params['halign']) {
48:         case 'right':
49:             $h = 'east';
50:             break;
51:         case 'center':
52:             $h = 'center';
53:             break;
54:         default:
55:             $h = 'west';
56: 
57:         }
58:         if (($v == 'center' && $h != 'center') ||
59:             ($v == 'center' && $h == 'center')) {
60:             $gravity = $h;
61:         } elseif ($h == 'center' && $v != 'center') {
62:             $gravity = $v;
63:         } else {
64:             $gravity = $v . $h;
65:         }
66:         /* Determine font point size */
67:         $point = $this->_image->getFontSize($this->_params['fontsize']);
68:         $this->_image->raw();
69:         $this->_image->addPostSrcOperation(' -font ' . $this->_params['font'] . ' -pointsize ' . $point . ' \( +clone -resize 1x1 -fx 1-intensity -threshold 50% -scale 32x32 -write mpr:color +delete \) -tile mpr:color -gravity ' . $gravity . ' -annotate +20+10 "' . $this->_params['text'] . '"');
70:         $this->_image->raw();
71:     }
72: 
73: }
74: