Example #1
0
 public static function scaleImage($group, $imageUrl, $scale = 1, $resizeRemote = false)
 {
     $originalImageUrl = $imageUrl;
     $imageUrl = N2ImageHelper::fixed($imageUrl);
     if ($scale > 0 && function_exists('exif_imagetype') && function_exists('imagecreatefrompng')) {
         if (substr($imageUrl, 0, 2) == '//') {
             $imageUrl = parse_url(N2Uri::getBaseuri(), PHP_URL_SCHEME) . ':' . $imageUrl;
         }
         $imageUrl = N2Uri::relativetoabsolute($imageUrl);
         $imagePath = N2Filesystem::absoluteURLToPath($imageUrl);
         $cache = new self($group);
         if ($imagePath == $imageUrl) {
             // The image is not local
             if (!$resizeRemote) {
                 return $originalImageUrl;
             }
             $pathInfo = pathinfo(parse_url($imageUrl, PHP_URL_PATH));
             $extension = self::validateExtension($pathInfo['extension']);
             if (!$extension) {
                 return $originalImageUrl;
             }
             return N2ImageHelper::dynamic(N2Filesystem::pathToAbsoluteURL($cache->makeCache($extension, array($cache, '_scaleRemoteImage'), array($extension, $imageUrl, $scale))));
         } else {
             $extension = false;
             $imageType = @exif_imagetype($imagePath);
             switch ($imageType) {
                 case IMAGETYPE_JPEG:
                     $extension = 'jpg';
                     break;
                 case IMAGETYPE_PNG:
                     $extension = 'png';
                     $fp = fopen($imagePath, 'r');
                     fseek($fp, 25);
                     $data = fgets($fp, 2);
                     fclose($fp);
                     if (ord($data) == 3) {
                         // GD cannot resize palette PNG so we return the original image
                         return $originalImageUrl;
                     }
                     break;
             }
             if (!$extension) {
                 throw new Exception('Filtype of the image is not supported: #' . $imageType . ' code  ' . $imagePath);
             }
             return N2ImageHelper::dynamic(N2Filesystem::pathToAbsoluteURL($cache->makeCache($extension, array($cache, '_scaleImage'), array($extension, $imagePath, $scale, filemtime($imagePath)))));
         }
     }
 }