1 <?php
  2     /**
  3  * @author Gasper Kozak
  4  * @copyright 2007-2011
  5 
  6     This file is part of WideImage.
  7         
  8     WideImage is free software; you can redistribute it and/or modify
  9     it under the terms of the GNU Lesser General Public License as published by
 10     the Free Software Foundation; either version 2.1 of the License, or
 11     (at your option) any later version.
 12         
 13     WideImage is distributed in the hope that it will be useful,
 14     but WITHOUT ANY WARRANTY; without even the implied warranty of
 15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 16     GNU Lesser General Public License for more details.
 17         
 18     You should have received a copy of the GNU Lesser General Public License
 19     along with WideImage; if not, write to the Free Software
 20     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 21 
 22     * @package Internal/Operations
 23   **/
 24     
 25     /**
 26      * ApplyMask operation class
 27      * 
 28      * @package Internal/Operations
 29      */
 30     class WideImage_Operation_ApplyMask
 31     {
 32         /**
 33          * Applies a mask on the copy of source image
 34          *
 35          * @param WideImage_Image $image
 36          * @param WideImage_Image $mask
 37          * @param smart_coordinate $left
 38          * @param smart_coordinate $top
 39          * @return WideImage_Image
 40          */
 41         function execute($image, $mask, $left = 0, $top = 0)
 42         {
 43             $left = WideImage_Coordinate::fix($left, $image->getWidth(), $mask->getWidth());
 44             $top = WideImage_Coordinate::fix($top, $image->getHeight(), $mask->getHeight());
 45             
 46             $width = $image->getWidth();
 47             $mask_width = $mask->getWidth();
 48             
 49             $height = $image->getHeight();
 50             $mask_height = $mask->getHeight();
 51             
 52             $result = $image->asTrueColor();
 53             
 54             $result->alphaBlending(false);
 55             $result->saveAlpha(true);
 56             
 57             $srcTransparentColor = $result->getTransparentColor();
 58             if ($srcTransparentColor >= 0)
 59             {
 60                 # this was here. works without.
 61                 #$trgb = $image->getColorRGB($srcTransparentColor);
 62                 #$trgb['alpha'] = 127;
 63                 #$destTransparentColor = $result->allocateColorAlpha($trgb);
 64                 #$result->setTransparentColor($destTransparentColor);
 65                 $destTransparentColor = $srcTransparentColor;
 66             }
 67             else
 68             {
 69                 $destTransparentColor = $result->allocateColorAlpha(255, 255, 255, 127);
 70             }
 71             
 72             for ($x = 0; $x < $width; $x++)
 73                 for ($y = 0; $y < $height; $y++)
 74                 {
 75                     $mx = $x - $left;
 76                     $my = $y - $top;
 77                     if ($mx >= 0 && $mx < $mask_width && $my >= 0 && $my < $mask_height)
 78                     {
 79                         $srcColor = $image->getColorAt($x, $y);
 80                         if ($srcColor == $srcTransparentColor)
 81                             $destColor = $destTransparentColor;
 82                         else
 83                         {
 84                             $maskRGB = $mask->getRGBAt($mx, $my);
 85                             if ($maskRGB['red'] == 0)
 86                                 $destColor = $destTransparentColor;
 87                             elseif ($srcColor >= 0)
 88                             {
 89                                 $imageRGB = $image->getRGBAt($x, $y);
 90                                 $level = ($maskRGB['red'] / 255) * (1 - $imageRGB['alpha'] / 127);
 91                                 $imageRGB['alpha'] = 127 - round($level * 127);
 92                                 if ($imageRGB['alpha'] == 127)
 93                                     $destColor = $destTransparentColor;
 94                                 else
 95                                     $destColor = $result->allocateColorAlpha($imageRGB);
 96                             }
 97                             else
 98                                 $destColor = $destTransparentColor;
 99                         }
100                         $result->setColorAt($x, $y, $destColor);
101                     }
102                 }
103             return $result;
104         }
105     }
106