1: <?php
 2: /**
 3:  * Image effect for watermarking images with text for the GD driver..
 4:  *
 5:  * @author  Michael J. Rubinsky <mrubinsk@horde.org>
 6:  * @package Image
 7:  */
 8: class Horde_Image_Effect_Gd_TextWatermark extends Horde_Image_Effect
 9: {
10:     /**
11:      * Valid parameters for watermark effects:
12:      *
13:      *   text (required)  - The text of the watermark.
14:      *   halign           - The horizontal placement
15:      *   valign           - The vertical placement
16:      *   font             - The font name or family to use
17:      *   fontsize         - The size of the font to use
18:      *                      (small, medium, large, giant)
19:      *
20:      * @var array
21:      */
22:     protected $_params = array('halign' => 'right',
23:                                'valign' => 'bottom',
24:                                'font' => 'courier',
25:                                'fontsize' => 'small');
26:     /**
27:      * Add the watermark
28:      */
29:     public function apply()
30:     {
31:         $color = $this->_image->call('imageColorClosest', array($this->_image->_im, 255, 255, 255));
32:         $shadow = $this->_image->call('imageColorClosest', array($this->_image->_im, 0, 0, 0));
33: 
34:         // Shadow offset in pixels.
35:         $drop = 1;
36: 
37:         // Maximum text width.
38:         $maxwidth = 200;
39: 
40:         // Amount of space to leave between the text and the image border.
41:         $padding = 10;
42: 
43:         $f = $this->_image->getFont($this->_params['fontsize']);
44:         $fontwidth = $this->_image->call('imageFontWidth', array($f));
45:         $fontheight = $this->_image->call('imageFontHeight', array($f));
46: 
47:         // So that shadow is not off the image with right align and bottom valign.
48:         $margin = floor($padding + $drop) / 2;
49:         if ($maxwidth) {
50:             $maxcharsperline = floor(($maxwidth - ($margin * 2)) / $fontwidth);
51:             $text = wordwrap($this->_params['text'], $maxcharsperline, "\n", 1);
52:         }
53: 
54:         // Split $text into individual lines.
55:         $lines = explode("\n", $text);
56: 
57:         switch ($this->_params['valign']) {
58:         case 'center':
59:             $y = ($this->_image->call('imageSY', array($this->_image->_im)) - ($fontheight * count($lines))) / 2;
60:             break;
61: 
62:         case 'bottom':
63:             $y = $this->_image->call('imageSY', array($this->_image->_im)) - (($fontheight * count($lines)) + $margin);
64:             break;
65: 
66:         default:
67:             $y = $margin;
68:             break;
69:         }
70: 
71:         switch ($this->_params['halign']) {
72:         case 'right':
73:             foreach ($lines as $line) {
74:                 $this->_image->call('imageString', array($this->_image->_im, $f, ($this->_image->call('imageSX', array($this->_image->_im)) - $fontwidth * strlen($line)) - $margin + $drop, ($y + $drop), $line, $shadow));
75:                 $this->_image->call('imageString', array($this->_image->_im, $f, ($this->_image->call('imageSX', array($this->_image->_im)) - $fontwidth * strlen($line)) - $margin, $y, $line, $color));
76:                 $y += $fontheight;
77:             }
78:             break;
79: 
80:         case 'center':
81:             foreach ($lines as $line) {
82:                 $this->_image->call('imageString', array($this->_image->_im, $f, floor(($this->_image->call('imageSX', array($this->_image->_im)) - $fontwidth * strlen($line)) / 2) + $drop, ($y + $drop), $line, $shadow));
83:                 $this->_image->call('imageString', array($this->_image->_im, $f, floor(($this->_image->call('imageSX', array($this->_image->_im)) - $fontwidth * strlen($line)) / 2), $y, $line, $color));
84:                 $y += $fontheight;
85:             }
86:             break;
87: 
88:         default:
89:             foreach ($lines as $line) {
90:                 $this->_image->call('imageString', array($this->_image->_im, $f, $margin + $drop, ($y + $drop), $line, $shadow));
91:                 $this->_image->call('imageString', array($this->_image->_im, $f, $margin, $y, $line, $color));
92:                 $y += $fontheight;
93:             }
94:             break;
95:         }
96:     }
97: 
98: }