/[drupal]/contributions/modules/imagecache_actions/transparency.inc
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revision 1.3.2.4, Mon Aug 31 04:12:20 2009 UTC revision 1.3.2.5, Fri Oct 30 14:03:54 2009 UTC
# Line 1  Line 1 
1  <?php  <?php
2  // $Id: transparency.inc,v 1.3.2.3 2009/03/28 05:10:28 dman Exp $  // $Id: transparency.inc,v 1.3.2.4 2009/08/31 04:12:20 dman Exp $
3  /**  /**
4   * @file Helper functions for the alpha action for imagecache   * @file Helper functions for the alpha action for imagecache
5   *   *
# Line 144  function imagecache_alpha_image(&$image, Line 144  function imagecache_alpha_image(&$image,
144   * To save a partially transparent image, the image resource must be switched to PNG.   * To save a partially transparent image, the image resource must be switched to PNG.
145   * ... or maybe not. Just flatten it yourself, or switch the format yourself.   * ... or maybe not. Just flatten it yourself, or switch the format yourself.
146   * This hack would produce side effects otherwise.   * This hack would produce side effects otherwise.
147     *
148     * This algorithm runs maths per-pixel, and therefore is incredibly much more
149     * inefficient than any native routine. Will kill the server on large images.
150   */   */
151  function png_color2alpha(&$image, $color) {  function png_color2alpha(&$image, $color) {
152    #$image->info['extension'] = 'png';    #$image->info['extension'] = 'png';
153    #$image->info['mime_type'] = 'image/png';    #$image->info['mime_type'] = 'image/png';
154    $info = $image->info;    $info = $image->info;
155    if (!$info) return FALSE;    if (!$info) return FALSE;
   
156    $im1 = $image->resource;    $im1 = $image->resource;
157    
158    imagesavealpha($im1, TRUE);    imagesavealpha($im1, TRUE);
# Line 159  function png_color2alpha(&$image, $color Line 161  function png_color2alpha(&$image, $color
161    if ($color) $background = hex_to_rgb($color);    if ($color) $background = hex_to_rgb($color);
162    $width = imagesx($im1);    $width = imagesx($im1);
163    $height = imagesy($im1);    $height = imagesy($im1);
164    
165      if (($width*$height) > (600*600)) {
166        watchdog('imagecache_actions', __FUNCTION__ . " on {$image->source}. Image is TOO BIG to run the per-pixel algorithm. Aborting.");
167        return TRUE;
168      }
169    
170    for ($i = 0; $i < $height; $i++) { //this loop traverses each row in the image    for ($i = 0; $i < $height; $i++) { //this loop traverses each row in the image
171      for ($j = 0; $j < $width; $j++) { //this loop traverses each pixel of each row      for ($j = 0; $j < $width; $j++) { //this loop traverses each pixel of each row
172    
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