pierre@0: <?php
sly@2: // $Id: imageserve.inc,v 1.1.2.8.2.2.2.1 2009/04/09 14:06:27 jeremy Exp $
pierre@0: 
pierre@0: /**
pierre@0:  * @file
pierre@0:  * Image serving lib.
pierre@0:  *
pierre@0:  * Copyright (c) 2008-2009.
pierre@0:  *   Jeremy Andrews <jeremy@tag1consulting.com>.
pierre@0:  */
pierre@0: 
pierre@0: /**
pierre@0:  * Generate a tiny image with GD, used to count when an ad has been displayed
pierre@0:  * on a cached page.
pierre@0:  */
pierre@0: function adserve_counter_image() {
pierre@0:   adserve_variable('variable_load');
pierre@0:   adserve_bootstrap(0);
pierre@0: 
sly@2:   if (adserve_variable('aid')) {
sly@2:     $ad->aid = adserve_variable('aid');
sly@2:   }
sly@2:   if (isset($ad->aid) && $ad->aid) {
sly@2:     _debug_echo("adserve_counter_image: increment 'view' counter for aid: $ad->aid");
sly@2:     adserve_cache('increment', 'view', $ad->aid);
pierre@0:   }
pierre@0:   else {
sly@2:     _debug_echo("adserve_counter_image: increment 'count' counter for no aid");
sly@2:     adserve_cache('increment', 'count', NULL);
pierre@0:   }
pierre@0: 
pierre@0:   if (function_exists('imagecreate')) {
pierre@0:     $image = imagecreate(1, 1);
pierre@0:     // Tell the web browser not to cache this image so we register a count each
pierre@0:     // time the page is viewed.
pierre@0:     // Expires in the past:
pierre@0:     header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
pierre@0:     // Last loud:
pierre@0:     header('Last-Modified: '. gmdate('D, d M Y H:i:s') .' GMT');
pierre@0:     // HTTP 1.1:
pierre@0:     header('Cache-Control: no-store, no-cache, must-revalidate');
pierre@0:     header('Cache-Control: post-check=0, pre-check=0', FALSE);
pierre@0:     // HTTP 1.0:
pierre@0:     header('Pragma: no-cache');
pierre@0:   }
pierre@0:   else {
pierre@0:     // GD not installed, report error and exit.
pierre@0:     exit();
pierre@0:   }
pierre@0: 
pierre@0:   if (function_exists('imagejpeg')) {
pierre@0:     header("Content-type: image/jpeg");
pierre@0:     imagejpeg($image);
pierre@0:   }
pierre@0:   else if (function_exists('imagepng')) {
pierre@0:     header("Content-type: image/png");
pierre@0:     imagepng($image);
pierre@0:   }
pierre@0:   else if (function_exists('imagegif')) {
pierre@0:     header("Content-type: image/gif");
pierre@0:     imagegif($image);
pierre@0:   }
pierre@0:   imagedestroy($image);
pierre@0:   exit(0);
pierre@0: }