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      * ResizeCanvas operation class
 27      * 
 28      * @package Internal/Operations
 29      */
 30     class WideImage_Operation_ResizeCanvas
 31     {
 32         /**
 33          * Returns an image with a resized canvas
 34          * 
 35          * The image is filled with $color. Use $scale to determine, when to resize.
 36          *
 37          * @param WideImage_Image $img
 38          * @param smart_coordinate $width
 39          * @param smart_coordinate $height
 40          * @param smart_coordinate $left
 41          * @param smart_coordinate $top
 42          * @param int $color
 43          * @param string $scale 'up', 'down', 'any'
 44          * @param boolean $merge
 45          * @return WideImage_Image
 46          */
 47         function execute($img, $width, $height, $left, $top, $color, $scale, $merge)
 48         {
 49             $new_width = WideImage_Coordinate::fix($width, $img->getWidth());
 50             $new_height = WideImage_Coordinate::fix($height, $img->getHeight());
 51             
 52             if ($scale == 'down')
 53             {
 54                 $new_width = min($new_width, $img->getWidth());
 55                 $new_height = min($new_height, $img->getHeight());
 56             }
 57             elseif ($scale == 'up')
 58             {
 59                 $new_width = max($new_width, $img->getWidth());
 60                 $new_height = max($new_height, $img->getHeight());
 61             }
 62             
 63             $new = WideImage::createTrueColorImage($new_width, $new_height);
 64             if ($img->isTrueColor())
 65             {
 66                 if ($color === null)
 67                     $color = $new->allocateColorAlpha(0, 0, 0, 127);
 68             }
 69             else
 70             {
 71                 imagepalettecopy($new->getHandle(), $img->getHandle());
 72                 
 73                 if ($img->isTransparent())
 74                 {
 75                     $new->copyTransparencyFrom($img);
 76                     $tc_rgb = $img->getTransparentColorRGB();
 77                     $t_color = $new->allocateColorAlpha($tc_rgb);
 78                 }
 79                 
 80                 if ($color === null)
 81                 {
 82                     if ($img->isTransparent())
 83                         $color = $t_color;
 84                     else
 85                         $color = $new->allocateColorAlpha(255, 0, 127, 127);
 86                     
 87                     imagecolortransparent($new->getHandle(), $color);
 88                 }
 89             }
 90             $new->fill(0, 0, $color);
 91             
 92             
 93             $x = WideImage_Coordinate::fix($left, $new->getWidth(), $img->getWidth());
 94             $y = WideImage_Coordinate::fix($top, $new->getHeight(), $img->getHeight());
 95             
 96             // blending for truecolor images
 97             if ($img->isTrueColor())
 98                 $new->alphaBlending($merge);
 99             
100             // not-blending for palette images
101             if (!$merge && !$img->isTrueColor() && isset($t_color))
102                 $new->getCanvas()->filledRectangle($x, $y, $x + $img->getWidth(), $y + $img->getHeight(), $t_color);
103             
104             $img->copyTo($new, $x, $y);
105             return $new;
106         }
107     }
108