includes/Image.php

   1 <?php
   2 # Class to represent an image
   3 # Provides methods to retrieve paths (physical, logical, URL),
   4 # to generate thumbnails or for uploading.
   5
   6 class Image
   7 {
   8         /* private */
   9         var     $name,          # name of the image
  10                 $imagePath,     # Path of the image
  11                 $url,           # Image URL
  12                 $title,         # Title object for this image. Initialized when needed.
  13                 $fileExists,    # does the image file exist on disk?
  14                 $historyLine,   # Number of line to return by nextHistoryLine()
  15                 $historyRes,    # result of the query for the image's history
  16                 $width,         # \
  17                 $height,        #  --- returned by getimagesize, see http://de3.php.net/manual/en/function.getimagesize.php
  18                 $type,          #  |
  19                 $attr;          # /
  20
  21
  22
  23         function Image( $name )
  24         {
  25                 global $wgUploadDirectory;
  26
  27                 $this->name      = $name;
  28                 $this->title     = Title::makeTitle( Namespace::getImage(), $this->name );
  29                 //$this->imagePath = wfImagePath( $name );
  30                 $hash            = md5( $this->title->getDBkey() );
  31                 $this->imagePath = $wgUploadDirectory . "/" . $hash{0} . "/" .substr( $hash, 0, 2 ) . "/{$name}";
  32
  33                 $this->url       = $this->wfImageUrl( $name );
  34
  35                 if ( $this->fileExists = file_exists( $this->imagePath ) ) // Sic!, "=" is intended
  36                 {
  37                         list($this->width, $this->height, $this->type, $this->attr) = getimagesize( $this->imagePath );
  38                 }
  39                 $this->historyLine = 0;
  40         }
  41
  42         function newFromTitle( $nt )
  43         {
  44                 $img = new Image( $nt->getDBKey() );
  45                 $img->title = $nt;
  46                 return $img;
  47         }
  48
  49         function getName()
  50         {
  51                 return $this->name;
  52         }
  53
  54         function getURL()
  55         {
  56                 return $this->url;
  57         }
  58
  59         function getImagePath()
  60         {
  61                 return $this->imagePath;
  62         }
  63
  64         function getWidth()
  65         {
  66                 return $this->width;
  67         }
  68
  69         function getHeight()
  70         {
  71                 return $this->height;
  72         }
  73
  74         function getType()
  75         {
  76                 return $this->type;
  77         }
  78
  79         function getEscapeLocalURL()
  80         {
  81                 return $this->title->escapeLocalURL();
  82         }
  83
  84         function wfImageUrl( $name )
  85         {
  86                 global $wgUploadPath;
  87                 $hash = md5( $name );
  88
  89                 $url = "{$wgUploadPath}/" . $hash{0} . "/" .
  90                 substr( $hash, 0, 2 ) . "/{$name}";
  91                 return wfUrlencode( $url );
  92         }
  93
  94
  95         function exists()
  96         {
  97                 return $this->fileExists;
  98         }
  99
 100         function thumbUrl( $width, $subdir="thumb" ) {
 101                 global $wgUploadPath;
 102
 103                 $name = $this->thumbName( $width );
 104                 $hash = md5( $name );
 105                 $url = "{$wgUploadPath}/{$subdir}/" . $hash{0} . "/" . substr( $hash, 0, 2 ) . "/{$name}";
 106
 107                 return wfUrlencode($url);
 108         }
 109
 110         function thumbName( $width ) {
 111                 return $width."px-".$this->name;
 112         }
 113
 114         //**********************************************************************
 115         // Create a thumbnail of the image having the specified width.
 116         // The thumbnail will not be created if the width is larger than the
 117         // image's width. Let the browser do the scaling in this case.
 118         // The thumbnail is stored on disk and is only computed if the thumbnail
 119         // file does not exist OR if it is older than the image.
 120         function createThumb( $width ) {
 121                 global $wgUploadDirectory;
 122                 global $wgImageMagickConvertCommand;
 123                 global $wgUseImageMagick;
 124                 global $wgUseSquid, $wgInternalServer;
 125
 126                 $width = IntVal( $width );
 127
 128                 $thumbName = $this->thumbName( $width );
 129                 $thumbPath = wfImageThumbDir( $thumbName )."/".$thumbName;
 130                 $thumbUrl  = $this->thumbUrl( $width );
 131
 132                 if ( ! $this->exists() )
 133                 {
 134                         # If there is no image, there will be no thumbnail
 135                         return "";
 136                 }
 137
 138                 # Sanity check $width
 139                 if( $width <= 0 ) {
 140                         # BZZZT
 141                         return "";
 142                 }
 143
 144                 if( $width > $this->width ) {
 145                         # Don't make an image bigger than the source
 146                         return $this->getURL();
 147                 }
 148
 149                 if (    (! file_exists( $thumbPath ) )
 150                      || ( filemtime($thumbPath) < filemtime($this->imagePath) ) ) {
 151                         # Squid purging
 152                         if ( $wgUseSquid ) {
 153                                 $urlArr = Array(
 154                                         $wgInternalServer.$thumbUrl
 155                                 );
 156                                 wfPurgeSquidServers($urlArr);
 157                         }
 158
 159                         if ( $wgUseImageMagick ) {
 160                                 # use ImageMagick
 161                                 $cmd  =  $wgImageMagickConvertCommand .
 162                                         " -quality 85 -geometry {$width} ".
 163                                         escapeshellarg($this->imagePath) . " " .
 164                                         escapeshellarg($thumbPath);
 165                                 $conv = shell_exec( $cmd );
 166                         } else {
 167                                 # Use PHP's builtin GD library functions.
 168                                 #
 169                                 # First find out what kind of file this is, and select the correct
 170                                 # input routine for this.
 171
 172                                 switch( $this->type ) {
 173                                         case 1: # GIF
 174                                                 $src_image = imagecreatefromgif( $this->imagePath );
 175                                                 break;
 176                                         case 2: # JPG
 177                                                 $src_image = imagecreatefromjpeg( $this->imagePath );
 178                                                 break;
 179                                         case 3: # PNG
 180                                                 $src_image = imagecreatefrompng( $this->imagePath );
 181                                                 break;
 182                                         case 15: # WBMP for WML
 183                                                 $src_image = imagecreatefromwbmp( $this->imagePath );
 184                                                 break;
 185                                         case 16: # XBM
 186                                                 $src_image = imagecreatefromxbm( $this->imagePath );
 187                                                 break;
 188                                         default:
 189                                                 return "Image type not supported";
 190                                                 break;
 191                                 }
 192                                 $height = floor( $this->height * ( $width/$this->width ) );
 193                                 $dst_image = imagecreatetruecolor( $width, $height );
 194                                 imagecopyresampled( $dst_image, $src_image,
 195                                                         0,0,0,0,
 196                                                         $width, $height, $this->width, $this->height );
 197                                 switch( $this->type ) {
 198                                         case 1:  # GIF
 199                                         case 3:  # PNG
 200                                         case 15: # WBMP
 201                                         case 16: # XBM
 202                                                 #$thumbUrl .= ".png";
 203                                                 #$thumbPath .= ".png";
 204                                                 imagepng( $dst_image, $thumbPath );
 205                                                 break;
 206                                         case 2:  # JPEG
 207                                                 #$thumbUrl .= ".jpg";
 208                                                 #$thumbPath .= ".jpg";
 209                                                 imageinterlace( $dst_image );
 210                                                 imagejpeg( $dst_image, $thumbPath, 95 );
 211                                                 break;
 212                                         default:
 213                                                 break;
 214                                 }
 215                                 imagedestroy( $dst_image );
 216                                 imagedestroy( $src_image );
 217
 218
 219                         }
 220                         #
 221                         # Check for zero-sized thumbnails. Those can be generated when
 222                         # no disk space is available or some other error occurs
 223                         #
 224                         $thumbstat = stat( $thumbPath );
 225                         if( $thumbstat["size"] == 0 )
 226                         {
 227                                 unlink( $thumbPath );
 228                         }
 229
 230                 }
 231                 return $thumbUrl;
 232         } // END OF function createThumb
 233
 234         //**********************************************************************
 235         // Return the image history of this image, line by line.
 236         // start with current version, than old versions.
 237         // use $this->historyLine to check which line to return:
 238         //  0      return line for current version
 239         //  1      query for old versions, return first one
 240         //  2, ... return next old version from above query
 241         function nextHistoryLine()
 242         {
 243                 $fname = "Image::nextHistoryLine()";
 244
 245                 if ( $this->historyLine == 0 ) // called for the first time, return line from cur
 246                 {
 247                         $sql = "SELECT img_size,img_description,img_user," .
 248                           "img_user_text,img_timestamp, '' AS oi_archive_name FROM image WHERE " .
 249                           "img_name='" . wfStrencode( $this->title->getDBkey() ) . "'";
 250                         $this->historyRes = wfQuery( $sql, DB_READ, $fname );
 251
 252                         if ( 0 == wfNumRows( $this->historyRes ) ) { return FALSE; }
 253
 254                 } else if ( $this->historyLine == 1 )
 255                 {
 256                         $sql = "SELECT oi_size AS img_size, oi_description AS img_description," .
 257                           "oi_user AS img_user," .
 258                           "oi_user_text AS img_user_text, oi_timestamp AS img_timestamp , oi_archive_name FROM oldimage WHERE " .
 259                           "oi_name='" . wfStrencode( $this->title->getDBkey() ) . "' " .
 260                           "ORDER BY oi_timestamp DESC";
 261                         $this->historyRes = wfQuery( $sql, DB_READ, $fname );
 262                 }
 263                 $this->historyLine ++;
 264
 265                 return wfFetchObject( $this->historyRes );
 266         }
 267
 268         function resetHistory()
 269         {
 270                 $this->historyLine = 0;
 271         }
 272
 273
 274 } //class
 275