includes/Image.php

   1 <?php
   2 /**
   3  * @package MediaWiki
   4  */
   5
   6 /**
   7  * NOTE FOR WINDOWS USERS:
   8  * To enable EXIF functions, add the folloing lines to the
   9  * "Windows extensions" section of php.ini:
  10  *
  11  * extension=extensions/php_mbstring.dll
  12  * extension=extensions/php_exif.dll
  13  */
  14
  15 if ($wgShowEXIF)
  16         require_once('Exif.php');
  17
  18 /**
  19  * Bump this number when serialized cache records may be incompatible.
  20  */
  21 define( 'MW_IMAGE_VERSION', 1 );
  22
  23 /**
  24  * Class to represent an image
  25  *
  26  * Provides methods to retrieve paths (physical, logical, URL),
  27  * to generate thumbnails or for uploading.
  28  * @package MediaWiki
  29  */
  30 class Image
  31 {
  32         /**#@+
  33          * @access private
  34          */
  35         var     $name,          # name of the image (constructor)
  36                 $imagePath,     # Path of the image (loadFromXxx)
  37                 $url,           # Image URL (accessor)
  38                 $title,         # Title object for this image (constructor)
  39                 $fileExists,    # does the image file exist on disk? (loadFromXxx)
  40                 $fromSharedDirectory, # load this image from $wgSharedUploadDirectory (loadFromXxx)
  41                 $historyLine,   # Number of line to return by nextHistoryLine() (constructor)
  42                 $historyRes,    # result of the query for the image's history (nextHistoryLine)
  43                 $width,         # \
  44                 $height,        #  |
  45                 $bits,          #   --- returned by getimagesize (loadFromXxx)
  46                 $attr,          # /
  47                 $type,          # MEDIATYPE_xxx (bitmap, drawing, audio...)
  48                 $mime,          # MIME type, determined by MimeMagic::guessMimeType
  49                 $size,          # Size in bytes (loadFromXxx)
  50                 $metadata,      # Metadata
  51                 $dataLoaded,    # Whether or not all this has been loaded from the database (loadFromXxx)
  52                 $lastError;     # Error string associated with a thumbnail display error
  53
  54
  55         /**#@-*/
  56
  57         /**
  58          * Create an Image object from an image name
  59          *
  60          * @param string $name name of the image, used to create a title object using Title::makeTitleSafe
  61          * @access public
  62          */
  63         function newFromName( $name ) {
  64                 $title = Title::makeTitleSafe( NS_IMAGE, $name );
  65                 if ( is_object( $title ) ) {
  66                         return new Image( $title );
  67                 } else {
  68                         return NULL;
  69                 }
  70         }
  71
  72         /**
  73          * Obsolete factory function, use constructor
  74          */
  75         function newFromTitle( $title ) {
  76                 return new Image( $title );
  77         }
  78
  79         function Image( $title ) {
  80                 if( !is_object( $title ) ) {
  81                         wfDebugDieBacktrace( 'Image constructor given bogus title.' );
  82                 }
  83                 $this->title =& $title;
  84                 $this->name = $title->getDBkey();
  85                 $this->metadata = serialize ( array() ) ;
  86
  87                 $n = strrpos( $this->name, '.' );
  88                 $this->extension = strtolower( $n ? substr( $this->name, $n + 1 ) : '' );
  89                 $this->historyLine = 0;
  90
  91                 $this->dataLoaded = false;
  92         }
  93
  94         /**
  95          * Get the memcached keys
  96          * Returns an array, first element is the local cache key, second is the shared cache key, if there is one
  97          */
  98         function getCacheKeys( $shared = false ) {
  99                 global $wgDBname, $wgUseSharedUploads, $wgSharedUploadDBname, $wgCacheSharedUploads;
 100
 101                 $foundCached = false;
 102                 $hashedName = md5($this->name);
 103                 $keys = array( "$wgDBname:Image:$hashedName" );
 104                 if ( $wgUseSharedUploads && $wgSharedUploadDBname && $wgCacheSharedUploads ) {
 105                         $keys[] = "$wgSharedUploadDBname:Image:$hashedName";
 106                 }
 107                 return $keys;
 108         }
 109
 110         /**
 111          * Try to load image metadata from memcached. Returns true on success.
 112          */
 113         function loadFromCache() {
 114                 global $wgUseSharedUploads, $wgMemc;
 115                 $fname = 'Image::loadFromMemcached';
 116                 wfProfileIn( $fname );
 117                 $this->dataLoaded = false;
 118                 $keys = $this->getCacheKeys();
 119                 $cachedValues = $wgMemc->get( $keys[0] );
 120
 121                 // Check if the key existed and belongs to this version of MediaWiki
 122                 if (!empty($cachedValues) && is_array($cachedValues)
 123                   && isset($cachedValues['version']) && ( $cachedValues['version'] == MW_IMAGE_VERSION )
 124                   && $cachedValues['fileExists'] && isset( $cachedValues['mime'] ) && isset( $cachedValues['metadata'] ) )
 125                 {
 126                         if ( $wgUseSharedUploads && $cachedValues['fromShared']) {
 127                                 # if this is shared file, we need to check if image
 128                                 # in shared repository has not changed
 129                                 if ( isset( $keys[1] ) ) {
 130                                         $commonsCachedValues = $wgMemc->get( $keys[1] );
 131                                         if (!empty($commonsCachedValues) && is_array($commonsCachedValues)
 132                                           && isset($commonsCachedValues['version'])
 133                                           && ( $commonsCachedValues['version'] == MW_IMAGE_VERSION )
 134                                           && isset($commonsCachedValues['mime'])) {
 135                                                 wfDebug( "Pulling image metadata from shared repository cache\n" );
 136                                                 $this->name = $commonsCachedValues['name'];
 137                                                 $this->imagePath = $commonsCachedValues['imagePath'];
 138                                                 $this->fileExists = $commonsCachedValues['fileExists'];
 139                                                 $this->width = $commonsCachedValues['width'];
 140                                                 $this->height = $commonsCachedValues['height'];
 141                                                 $this->bits = $commonsCachedValues['bits'];
 142                                                 $this->type = $commonsCachedValues['type'];
 143                                                 $this->mime = $commonsCachedValues['mime'];
 144                                                 $this->metadata = $commonsCachedValues['metadata'];
 145                                                 $this->size = $commonsCachedValues['size'];
 146                                                 $this->fromSharedDirectory = true;
 147                                                 $this->dataLoaded = true;
 148                                                 $this->imagePath = $this->getFullPath(true);
 149                                         }
 150                                 }
 151                         } else {
 152                                 wfDebug( "Pulling image metadata from local cache\n" );
 153                                 $this->name = $cachedValues['name'];
 154                                 $this->imagePath = $cachedValues['imagePath'];
 155                                 $this->fileExists = $cachedValues['fileExists'];
 156                                 $this->width = $cachedValues['width'];
 157                                 $this->height = $cachedValues['height'];
 158                                 $this->bits = $cachedValues['bits'];
 159                                 $this->type = $cachedValues['type'];
 160                                 $this->mime = $cachedValues['mime'];
 161                                 $this->metadata = $cachedValues['metadata'];
 162                                 $this->size = $cachedValues['size'];
 163                                 $this->fromSharedDirectory = false;
 164                                 $this->dataLoaded = true;
 165                                 $this->imagePath = $this->getFullPath();
 166                         }
 167                 }
 168                 if ( $this->dataLoaded ) {
 169                         wfIncrStats( 'image_cache_hit' );
 170                 } else {
 171                         wfIncrStats( 'image_cache_miss' );
 172                 }
 173
 174                 wfProfileOut( $fname );
 175                 return $this->dataLoaded;
 176         }
 177
 178         /**
 179          * Save the image metadata to memcached
 180          */
 181         function saveToCache() {
 182                 global $wgMemc;
 183                 $this->load();
 184                 $keys = $this->getCacheKeys();
 185                 if ( $this->fileExists ) {
 186                         // We can't cache negative metadata for non-existent files,
 187                         // because if the file later appears in commons, the local
 188                         // keys won't be purged.
 189                         $cachedValues = array(
 190                                 'version'    => MW_IMAGE_VERSION,
 191                                 'name'       => $this->name,
 192                                 'imagePath'  => $this->imagePath,
 193                                 'fileExists' => $this->fileExists,
 194                                 'fromShared' => $this->fromSharedDirectory,
 195                                 'width'      => $this->width,
 196                                 'height'     => $this->height,
 197                                 'bits'       => $this->bits,
 198                                 'type'       => $this->type,
 199                                 'mime'       => $this->mime,
 200                                 'metadata'   => $this->metadata,
 201                                 'size'       => $this->size );
 202
 203                         $wgMemc->set( $keys[0], $cachedValues, 60 * 60 * 24 * 7 ); // A week
 204                 } else {
 205                         // However we should clear them, so they aren't leftover
 206                         // if we've deleted the file.
 207                         $wgMemc->delete( $keys[0] );
 208                 }
 209         }
 210
 211         /**
 212          * Load metadata from the file itself
 213          */
 214         function loadFromFile() {
 215                 global $wgUseSharedUploads, $wgSharedUploadDirectory, $wgContLang,
 216                        $wgShowEXIF;
 217                 $fname = 'Image::loadFromFile';
 218                 wfProfileIn( $fname );
 219                 $this->imagePath = $this->getFullPath();
 220                 $this->fileExists = file_exists( $this->imagePath );
 221                 $this->fromSharedDirectory = false;
 222                 $gis = array();
 223
 224                 if (!$this->fileExists) wfDebug("$fname: ".$this->imagePath." not found locally!\n");
 225
 226                 # If the file is not found, and a shared upload directory is used, look for it there.
 227                 if (!$this->fileExists && $wgUseSharedUploads && $wgSharedUploadDirectory) {
 228                         # In case we're on a wgCapitalLinks=false wiki, we
 229                         # capitalize the first letter of the filename before
 230                         # looking it up in the shared repository.
 231                         $sharedImage = Image::newFromName( $wgContLang->ucfirst($this->name) );
 232                         $this->fileExists = $sharedImage && file_exists( $sharedImage->getFullPath(true) );
 233                         if ( $this->fileExists ) {
 234                                 $this->name = $sharedImage->name;
 235                                 $this->imagePath = $this->getFullPath(true);
 236                                 $this->fromSharedDirectory = true;
 237                         }
 238                 }
 239
 240
 241                 if ( $this->fileExists ) {
 242                         $magic=& wfGetMimeMagic();
 243
 244                         $this->mime = $magic->guessMimeType($this->imagePath,true);
 245                         $this->type = $magic->getMediaType($this->imagePath,$this->mime);
 246
 247                         # Get size in bytes
 248                         $this->size = filesize( $this->imagePath );
 249
 250                         $magic=& wfGetMimeMagic();
 251
 252                         # Height and width
 253                         if( $this->mime == 'image/svg' ) {
 254                                 wfSuppressWarnings();
 255                                 $gis = wfGetSVGsize( $this->imagePath );
 256                                 wfRestoreWarnings();
 257                         }
 258                         elseif ( !$magic->isPHPImageType( $this->mime ) ) {
 259                                 # Don't try to get the width and height of sound and video files, that's bad for performance
 260                                 $gis[0]= 0; //width
 261                                 $gis[1]= 0; //height
 262                                 $gis[2]= 0; //unknown
 263                                 $gis[3]= ""; //width height string
 264                         }
 265                         else {
 266                                 wfSuppressWarnings();
 267                                 $gis = getimagesize( $this->imagePath );
 268                                 wfRestoreWarnings();
 269                         }
 270
 271                         wfDebug("$fname: ".$this->imagePath." loaded, ".$this->size." bytes, ".$this->mime.".\n");
 272                 }
 273                 else {
 274                         $gis[0]= 0; //width
 275                         $gis[1]= 0; //height
 276                         $gis[2]= 0; //unknown
 277                         $gis[3]= ""; //width height string
 278
 279                         $this->mime = NULL;
 280                         $this->type = MEDIATYPE_UNKNOWN;
 281                         wfDebug("$fname: ".$this->imagePath." NOT FOUND!\n");
 282                 }
 283
 284                 $this->width = $gis[0];
 285                 $this->height = $gis[1];
 286
 287                 #NOTE: $gis[2] contains a code for the image type. This is no longer used.
 288
 289                 #NOTE: we have to set this flag early to avoid load() to be called
 290                 # be some of the functions below. This may lead to recursion or other bad things!
 291                 # as ther's only one thread of execution, this should be safe anyway.
 292                 $this->dataLoaded = true;
 293
 294
 295                 if ($this->fileExists && $wgShowEXIF) $this->metadata = serialize ( $this->retrieveExifData() ) ;
 296                 else $this->metadata = serialize ( array() ) ;
 297
 298                 if ( isset( $gis['bits'] ) )  $this->bits = $gis['bits'];
 299                 else $this->bits = 0;
 300
 301                 wfProfileOut( $fname );
 302         }
 303
 304         /**
 305          * Load image metadata from the DB
 306          */
 307         function loadFromDB() {
 308                 global $wgUseSharedUploads, $wgSharedUploadDBname, $wgSharedUploadDBprefix, $wgContLang;
 309                 $fname = 'Image::loadFromDB';
 310                 wfProfileIn( $fname );
 311
 312                 $dbr =& wfGetDB( DB_SLAVE );
 313
 314                 $this->checkDBSchema($dbr);
 315
 316                 $row = $dbr->selectRow( 'image',
 317                         array( 'img_size', 'img_width', 'img_height', 'img_bits',
 318                                'img_media_type', 'img_major_mime', 'img_minor_mime', 'img_metadata' ),
 319                         array( 'img_name' => $this->name ), $fname );
 320                 if ( $row ) {
 321                         $this->fromSharedDirectory = false;
 322                         $this->fileExists = true;
 323                         $this->loadFromRow( $row );
 324                         $this->imagePath = $this->getFullPath();
 325                         // Check for rows from a previous schema, quietly upgrade them
 326                         if ( is_null($this->type) ) {
 327                                 $this->upgradeRow();
 328                         }
 329                 } elseif ( $wgUseSharedUploads && $wgSharedUploadDBname ) {
 330                         # In case we're on a wgCapitalLinks=false wiki, we
 331                         # capitalize the first letter of the filename before
 332                         # looking it up in the shared repository.
 333                         $name = $wgContLang->ucfirst($this->name);
 334
 335                         $row = $dbr->selectRow( "`$wgSharedUploadDBname`.{$wgSharedUploadDBprefix}image",
 336                                 array(
 337                                         'img_size', 'img_width', 'img_height', 'img_bits',
 338                                         'img_media_type', 'img_major_mime', 'img_minor_mime', 'img_metadata' ),
 339                                 array( 'img_name' => $name ), $fname );
 340                         if ( $row ) {
 341                                 $this->fromSharedDirectory = true;
 342                                 $this->fileExists = true;
 343                                 $this->imagePath = $this->getFullPath(true);
 344                                 $this->name = $name;
 345                                 $this->loadFromRow( $row );
 346
 347                                 // Check for rows from a previous schema, quietly upgrade them
 348                                 if ( is_null($this->type) ) {
 349                                         $this->upgradeRow();
 350                                 }
 351                         }
 352                 }
 353
 354                 if ( !$row ) {
 355                         $this->size = 0;
 356                         $this->width = 0;
 357                         $this->height = 0;
 358                         $this->bits = 0;
 359                         $this->type = 0;
 360                         $this->fileExists = false;
 361                         $this->fromSharedDirectory = false;
 362                         $this->metadata = serialize ( array() ) ;
 363                 }
 364
 365                 # Unconditionally set loaded=true, we don't want the accessors constantly rechecking
 366                 $this->dataLoaded = true;
 367                 wfProfileOut( $fname );
 368         }
 369
 370         /*
 371          * Load image metadata from a DB result row
 372          */
 373         function loadFromRow( &$row ) {
 374                 $this->size = $row->img_size;
 375                 $this->width = $row->img_width;
 376                 $this->height = $row->img_height;
 377                 $this->bits = $row->img_bits;
 378                 $this->type = $row->img_media_type;
 379
 380                 $major= $row->img_major_mime;
 381                 $minor= $row->img_minor_mime;
 382
 383                 if (!$major) $this->mime = "unknown/unknown";
 384                 else {
 385                         if (!$minor) $minor= "unknown";
 386                         $this->mime = $major.'/'.$minor;
 387                 }
 388
 389                 $this->metadata = $row->img_metadata;
 390                 if ( $this->metadata == "" ) $this->metadata = serialize ( array() ) ;
 391
 392                 $this->dataLoaded = true;
 393         }
 394
 395         /**
 396          * Load image metadata from cache or DB, unless already loaded
 397          */
 398         function load() {
 399                 global $wgSharedUploadDBname, $wgUseSharedUploads;
 400                 if ( !$this->dataLoaded ) {
 401                         if ( !$this->loadFromCache() ) {
 402                                 $this->loadFromDB();
 403                                 if ( !$wgSharedUploadDBname && $wgUseSharedUploads ) {
 404                                         $this->loadFromFile();
 405                                 } elseif ( $this->fileExists ) {
 406                                         $this->saveToCache();
 407                                 }
 408                         }
 409                         $this->dataLoaded = true;
 410                 }
 411         }
 412
 413         /**
 414          * Metadata was loaded from the database, but the row had a marker indicating it needs to be
 415          * upgraded from the 1.4 schema, which had no width, height, bits or type. Upgrade the row.
 416          */
 417         function upgradeRow() {
 418                 global $wgDBname, $wgSharedUploadDBname;
 419                 $fname = 'Image::upgradeRow';
 420                 wfProfileIn( $fname );
 421
 422                 $this->loadFromFile();
 423                 $dbw =& wfGetDB( DB_MASTER );
 424
 425                 if ( $this->fromSharedDirectory ) {
 426                         if ( !$wgSharedUploadDBname ) {
 427                                 wfProfileOut( $fname );
 428                                 return;
 429                         }
 430
 431                         // Write to the other DB using selectDB, not database selectors
 432                         // This avoids breaking replication in MySQL
 433                         $dbw->selectDB( $wgSharedUploadDBname );
 434                 }
 435
 436                 $this->checkDBSchema($dbw);
 437
 438                 if (strpos($this->mime,'/')!==false) {
 439                         list($major,$minor)= explode('/',$this->mime,2);
 440                 }
 441                 else {
 442                         $major= $this->mime;
 443                         $minor= "unknown";
 444                 }
 445
 446                 wfDebug("$fname: upgrading ".$this->name." to 1.5 schema\n");
 447
 448                 $dbw->update( 'image',
 449                         array(
 450                                 'img_width' => $this->width,
 451                                 'img_height' => $this->height,
 452                                 'img_bits' => $this->bits,
 453                                 'img_media_type' => $this->type,
 454                                 'img_major_mime' => $major,
 455                                 'img_minor_mime' => $minor,
 456                                 'img_metadata' => $this->metadata,
 457                         ), array( 'img_name' => $this->name ), $fname
 458                 );
 459                 if ( $this->fromSharedDirectory ) {
 460                         $dbw->selectDB( $wgDBname );
 461                 }
 462                 wfProfileOut( $fname );
 463         }
 464
 465         /**
 466          * Return the name of this image
 467          * @access public
 468          */
 469         function getName() {
 470                 return $this->name;
 471         }
 472
 473         /**
 474          * Return the associated title object
 475          * @access public
 476          */
 477         function getTitle() {
 478                 return $this->title;
 479         }
 480
 481         /**
 482          * Return the URL of the image file
 483          * @access public
 484          */
 485         function getURL() {
 486                 if ( !$this->url ) {
 487                         $this->load();
 488                         if($this->fileExists) {
 489                                 $this->url = Image::imageUrl( $this->name, $this->fromSharedDirectory );
 490                         } else {
 491                                 $this->url = '';
 492                         }
 493                 }
 494                 return $this->url;
 495         }
 496
 497         function getViewURL() {
 498                 if( $this->mustRender()) {
 499                         if( $this->canRender() ) {
 500                                 return $this->createThumb( $this->getWidth() );
 501                         }
 502                         else {
 503                                 wfDebug('Image::getViewURL(): supposed to render '.$this->name.' ('.$this->mime."), but can't!\n");
 504                                 return $this->getURL(); #hm... return NULL?
 505                         }
 506                 } else {
 507                         return $this->getURL();
 508                 }
 509         }
 510
 511         /**
 512          * Return the image path of the image in the
 513          * local file system as an absolute path
 514          * @access public
 515          */
 516         function getImagePath() {
 517                 $this->load();
 518                 return $this->imagePath;
 519         }
 520
 521         /**
 522          * Return the width of the image
 523          *
 524          * Returns -1 if the file specified is not a known image type
 525          * @access public
 526          */
 527         function getWidth() {
 528                 $this->load();
 529                 return $this->width;
 530         }
 531
 532         /**
 533          * Return the height of the image
 534          *
 535          * Returns -1 if the file specified is not a known image type
 536          * @access public
 537          */
 538         function getHeight() {
 539                 $this->load();
 540                 return $this->height;
 541         }
 542
 543         /**
 544          * Return the size of the image file, in bytes
 545          * @access public
 546          */
 547         function getSize() {
 548                 $this->load();
 549                 return $this->size;
 550         }
 551
 552         /**
 553          * Returns the mime type of the file.
 554          */
 555         function getMimeType() {
 556                 $this->load();
 557                 return $this->mime;
 558         }
 559
 560         /**
 561          * Return the type of the media in the file.
 562          * Use the value returned by this function with the MEDIATYPE_xxx constants.
 563          */
 564         function getMediaType() {
 565                 $this->load();
 566                 return $this->type;
 567         }
 568
 569         /**
 570          * Checks if the file can be presented to the browser as a bitmap.
 571          *
 572          * Currently, this checks if the file is an image format
 573          * that can be converted to a format
 574          * supported by all browsers (namely GIF, PNG and JPEG),
 575          * or if it is an SVG image and SVG conversion is enabled.
 576          *
 577          * @todo remember the result of this check.
 578          */
 579         function canRender() {
 580                 global $wgUseImageMagick;
 581
 582                 if( $this->getWidth()<=0 || $this->getHeight()<=0 ) return false;
 583
 584                 $mime= $this->getMimeType();
 585
 586                 if (!$mime || $mime==='unknown' || $mime==='unknown/unknown') return false;
 587
 588                 #if it's SVG, check if there's a converter enabled
 589                 if ($mime === 'image/svg') {
 590                         global $wgSVGConverters, $wgSVGConverter;
 591
 592                         if ($wgSVGConverter && isset( $wgSVGConverters[$wgSVGConverter])) {
 593                                 wfDebug( "Image::canRender: SVG is ready!\n" );
 594                                 return true;
 595                         } else {
 596                                 wfDebug( "Image::canRender: SVG renderer missing\n" );
 597                         }
 598                 }
 599
 600                 #image formats available on ALL browsers
 601                 if (  $mime === 'image/gif'
 602                    || $mime === 'image/png'
 603                    || $mime === 'image/jpeg' ) return true;
 604
 605                 #image formats that can be converted to the above formats
 606                 if ($wgUseImageMagick) {
 607                         #convertable by ImageMagick (there are more...)
 608                         if ( $mime === 'image/vnd.wap.wbmp'
 609                           || $mime === 'image/x-xbitmap'
 610                           || $mime === 'image/x-xpixmap'
 611                           #|| $mime === 'image/x-icon'   #file may be split into multiple parts
 612                           || $mime === 'image/x-portable-anymap'
 613                           || $mime === 'image/x-portable-bitmap'
 614                           || $mime === 'image/x-portable-graymap'
 615                           || $mime === 'image/x-portable-pixmap'
 616                           #|| $mime === 'image/x-photoshop'  #this takes a lot of CPU and RAM!
 617                           || $mime === 'image/x-rgb'
 618                           || $mime === 'image/x-bmp'
 619                           || $mime === 'image/tiff' ) return true;
 620                 }
 621                 else {
 622                         #convertable by the PHP GD image lib
 623                         if ( $mime === 'image/vnd.wap.wbmp'
 624                           || $mime === 'image/x-xbitmap' ) return true;
 625                 }
 626
 627                 return false;
 628         }
 629
 630
 631         /**
 632          * Return true if the file is of a type that can't be directly
 633          * rendered by typical browsers and needs to be re-rasterized.
 634          *
 635          * This returns true for everything but the bitmap types
 636          * supported by all browsers, i.e. JPEG; GIF and PNG. It will
 637          * also return true for any non-image formats.
 638          *
 639          * @return bool
 640          */
 641         function mustRender() {
 642                 $mime= $this->getMimeType();
 643
 644                 if (  $mime === "image/gif"
 645                    || $mime === "image/png"
 646                    || $mime === "image/jpeg" ) return false;
 647
 648                 return true;
 649         }
 650
 651         /**
 652          * Determines if this media file may be shown inline on a page.
 653          *
 654          * This is currently synonymous to canRender(), but this could be
 655          * extended to also allow inline display of other media,
 656          * like flash animations or videos. If you do so, please keep in mind that
 657          * that could be a security risk.
 658          */
 659         function allowInlineDisplay() {
 660                 return $this->canRender();
 661         }
 662
 663         /**
 664          * Determines if this media file is in a format that is unlikely to
 665          * contain viruses or malicious content. It uses the global
 666          * $wgTrustedMediaFormats list to determine if the file is safe.
 667          *
 668          * This is used to show a warning on the description page of non-safe files.
 669          * It may also be used to disallow direct [[media:...]] links to such files.
 670          *
 671          * Note that this function will always return true if allowInlineDisplay()
 672          * or isTrustedFile() is true for this file.
 673          */
 674         function isSafeFile() {
 675                 if ($this->allowInlineDisplay()) return true;
 676                 if ($this->isTrustedFile()) return true;
 677
 678                 global $wgTrustedMediaFormats;
 679
 680                 $type= $this->getMediaType();
 681                 $mime= $this->getMimeType();
 682                 #wfDebug("Image::isSafeFile: type= $type, mime= $mime\n");
 683
 684                 if (!$type || $type===MEDIATYPE_UNKNOWN) return false; #unknown type, not trusted
 685                 if ( in_array( $type, $wgTrustedMediaFormats) ) return true;
 686
 687                 if ($mime==="unknown/unknown") return false; #unknown type, not trusted
 688                 if ( in_array( $mime, $wgTrustedMediaFormats) ) return true;
 689
 690                 return false;
 691         }
 692
 693         /** Returns true if the file is flagged as trusted. Files flagged that way
 694         * can be linked to directly, even if that is not allowed for this type of
 695         * file normally.
 696         *
 697         * This is a dummy function right now and always returns false. It could be
 698         * implemented to extract a flag from the database. The trusted flag could be
 699         * set on upload, if the user has sufficient privileges, to bypass script-
 700         * and html-filters. It may even be coupled with cryptographics signatures
 701         * or such.
 702         */
 703         function isTrustedFile() {
 704                 #this could be implemented to check a flag in the databas,
 705                 #look for signatures, etc
 706                 return false;
 707         }
 708
 709         /**
 710          * Return the escapeLocalURL of this image
 711          * @access public
 712          */
 713         function getEscapeLocalURL() {
 714                 $this->getTitle();
 715                 return $this->title->escapeLocalURL();
 716         }
 717
 718         /**
 719          * Return the escapeFullURL of this image
 720          * @access public
 721          */
 722         function getEscapeFullURL() {
 723                 $this->getTitle();
 724                 return $this->title->escapeFullURL();
 725         }
 726
 727         /**
 728          * Return the URL of an image, provided its name.
 729          *
 730          * @param string $name  Name of the image, without the leading "Image:"
 731          * @param boolean $fromSharedDirectory  Should this be in $wgSharedUploadPath?
 732          * @return string URL of $name image
 733          * @access public
 734          * @static
 735          */
 736         function imageUrl( $name, $fromSharedDirectory = false ) {
 737                 global $wgUploadPath,$wgUploadBaseUrl,$wgSharedUploadPath;
 738                 if($fromSharedDirectory) {
 739                         $base = '';
 740                         $path = $wgSharedUploadPath;
 741                 } else {
 742                         $base = $wgUploadBaseUrl;
 743                         $path = $wgUploadPath;
 744                 }
 745                 $url = "{$base}{$path}" .  wfGetHashPath($name, $fromSharedDirectory) . "{$name}";
 746                 return wfUrlencode( $url );
 747         }
 748
 749         /**
 750          * Returns true if the image file exists on disk.
 751          * @return boolean Whether image file exist on disk.
 752          * @access public
 753          */
 754         function exists() {
 755                 $this->load();
 756                 return $this->fileExists;
 757         }
 758
 759         /**
 760          * @todo document
 761          * @access private
 762          */
 763         function thumbUrl( $width, $subdir='thumb') {
 764                 global $wgUploadPath, $wgUploadBaseUrl, $wgSharedUploadPath;
 765                 global $wgSharedThumbnailScriptPath, $wgThumbnailScriptPath;
 766
 767                 // Generate thumb.php URL if possible
 768                 $script = false;
 769                 $url = false;
 770
 771                 if ( $this->fromSharedDirectory ) {
 772                         if ( $wgSharedThumbnailScriptPath ) {
 773                                 $script = $wgSharedThumbnailScriptPath;
 774                         }
 775                 } else {
 776                         if ( $wgThumbnailScriptPath ) {
 777                                 $script = $wgThumbnailScriptPath;
 778                         }
 779                 }
 780                 if ( $script ) {
 781                         $url = $script . '?f=' . urlencode( $this->name ) . '&w=' . urlencode( $width );
 782                         if( $this->mustRender() ) {
 783                                 $url.= '&r=1';
 784                         }
 785                 } else {
 786                         $name = $this->thumbName( $width );
 787                         if($this->fromSharedDirectory) {
 788                                 $base = '';
 789                                 $path = $wgSharedUploadPath;
 790                         } else {
 791                                 $base = $wgUploadBaseUrl;
 792                                 $path = $wgUploadPath;
 793                         }
 794                         if ( Image::isHashed( $this->fromSharedDirectory ) ) {
 795                                 $url = "{$base}{$path}/{$subdir}" .
 796                                 wfGetHashPath($this->name, $this->fromSharedDirectory)
 797                                 . $this->name.'/'.$name;
 798                                 $url = wfUrlencode( $url );
 799                         } else {
 800                                 $url = "{$base}{$path}/{$subdir}/{$name}";
 801                         }
 802                 }
 803                 return array( $script !== false, $url );
 804         }
 805
 806         /**
 807          * Return the file name of a thumbnail of the specified width
 808          *
 809          * @param integer $width        Width of the thumbnail image
 810          * @param boolean $shared       Does the thumbnail come from the shared repository?
 811          * @access private
 812          */
 813         function thumbName( $width ) {
 814                 $thumb = $width."px-".$this->name;
 815
 816                 if( $this->mustRender() ) {
 817                         if( $this->canRender() ) {
 818                                 # Rasterize to PNG (for SVG vector images, etc)
 819                                 $thumb .= '.png';
 820                         }
 821                         else {
 822                                 #should we use iconThumb here to get a symbolic thumbnail?
 823                                 #or should we fail with an internal error?
 824                                 return NULL; //can't make bitmap
 825                         }
 826                 }
 827                 return $thumb;
 828         }
 829
 830         /**
 831          * Create a thumbnail of the image having the specified width/height.
 832          * The thumbnail will not be created if the width is larger than the
 833          * image's width. Let the browser do the scaling in this case.
 834          * The thumbnail is stored on disk and is only computed if the thumbnail
 835          * file does not exist OR if it is older than the image.
 836          * Returns the URL.
 837          *
 838          * Keeps aspect ratio of original image. If both width and height are
 839          * specified, the generated image will be no bigger than width x height,
 840          * and will also have correct aspect ratio.
 841          *
 842          * @param integer $width        maximum width of the generated thumbnail
 843          * @param integer $height       maximum height of the image (optional)
 844          * @access public
 845          */
 846         function createThumb( $width, $height=-1 ) {
 847                 $thumb = $this->getThumbnail( $width, $height );
 848                 if( is_null( $thumb ) ) return '';
 849                 return $thumb->getUrl();
 850         }
 851
 852         /**
 853          * As createThumb, but returns a ThumbnailImage object. This can
 854          * provide access to the actual file, the real size of the thumb,
 855          * and can produce a convenient <img> tag for you.
 856          *
 857          * @param integer $width        maximum width of the generated thumbnail
 858          * @param integer $height       maximum height of the image (optional)
 859          * @return ThumbnailImage
 860          * @access public
 861          */
 862         function getThumbnail( $width, $height=-1 ) {
 863                 if ( $height <= 0 ) {
 864                         return $this->renderThumb( $width );
 865                 }
 866                 $this->load();
 867
 868                 if ($this->canRender()) {
 869                         if ( $width > $this->width * $height / $this->height )
 870                                 $width = wfFitBoxWidth( $this->width, $this->height, $height );
 871                         $thumb = $this->renderThumb( $width );
 872                 }
 873                 else $thumb= NULL; #not a bitmap or renderable image, don't try.
 874
 875                 if( is_null( $thumb ) ) {
 876                         $thumb = $this->iconThumb();
 877                 }
 878                 return $thumb;
 879         }
 880
 881         /**
 882          * @return ThumbnailImage
 883          */
 884         function iconThumb() {
 885                 global $wgStylePath, $wgStyleDirectory;
 886
 887                 $try = array( 'fileicon-' . $this->extension . '.png', 'fileicon.png' );
 888                 foreach( $try as $icon ) {
 889                         $path = '/common/images/icons/' . $icon;
 890                         $filepath = $wgStyleDirectory . $path;
 891                         if( file_exists( $filepath ) ) {
 892                                 return new ThumbnailImage( $wgStylePath . $path, 120, 120 );
 893                         }
 894                 }
 895                 return null;
 896         }
 897
 898         /**
 899          * Create a thumbnail of the image having the specified width.
 900          * The thumbnail will not be created if the width is larger than the
 901          * image's width. Let the browser do the scaling in this case.
 902          * The thumbnail is stored on disk and is only computed if the thumbnail
 903          * file does not exist OR if it is older than the image.
 904          * Returns an object which can return the pathname, URL, and physical
 905          * pixel size of the thumbnail -- or null on failure.
 906          *
 907          * @return ThumbnailImage
 908          * @access private
 909          */
 910         function renderThumb( $width, $useScript = true ) {
 911                 global $wgUseSquid, $wgInternalServer;
 912                 global $wgThumbnailScriptPath, $wgSharedThumbnailScriptPath;
 913                 global $wgSVGMaxSize, $wgMaxImageArea, $wgThumbnailEpoch;
 914
 915                 $fname = 'Image::renderThumb';
 916                 wfProfileIn( $fname );
 917
 918                 $width = intval( $width );
 919
 920                 $this->load();
 921                 if ( ! $this->exists() )
 922                 {
 923                         # If there is no image, there will be no thumbnail
 924                         wfProfileOut( $fname );
 925                         return null;
 926                 }
 927
 928                 # Sanity check $width
 929                 if( $width <= 0 || $this->width <= 0) {
 930                         # BZZZT
 931                         wfProfileOut( $fname );
 932                         return null;
 933                 }
 934
 935                 # Don't thumbnail an image so big that it will fill hard drives and send servers into swap
 936                 # JPEG has the handy property of allowing thumbnailing without full decompression, so we make
 937                 # an exception for it.
 938                 if ( $this->getMediaType() == MEDIATYPE_BITMAP &&
 939                         $this->getMimeType() !== 'image/jpeg' &&
 940                         $this->width * $this->height > $wgMaxImageArea )
 941                 {
 942                         wfProfileOut( $fname );
 943                         return null;
 944                 }
 945
 946                 # Don't make an image bigger than the source, or wgMaxSVGSize for SVGs
 947                 if ( $this->mustRender() ) {
 948                         $width = min( $width, $wgSVGMaxSize );
 949                 } elseif ( $width > $this->width - 1 ) {
 950                         $thumb = new ThumbnailImage( $this->getURL(), $this->getWidth(), $this->getHeight() );
 951                         wfProfileOut( $fname );
 952                         return $thumb;
 953                 }
 954
 955                 $height = round( $this->height * $width / $this->width );
 956
 957                 list( $isScriptUrl, $url ) = $this->thumbUrl( $width );
 958                 if ( $isScriptUrl && $useScript ) {
 959                         // Use thumb.php to render the image
 960                         $thumb = new ThumbnailImage( $url, $width, $height );
 961                         wfProfileOut( $fname );
 962                         return $thumb;
 963                 }
 964
 965                 $thumbName = $this->thumbName( $width, $this->fromSharedDirectory );
 966                 $thumbPath = wfImageThumbDir( $this->name, $this->fromSharedDirectory ).'/'.$thumbName;
 967
 968                 if ( is_dir( $thumbPath ) ) {
 969                         // Directory where file should be
 970                         // This happened occasionally due to broken migration code in 1.5
 971                         // Rename to broken-*
 972                         global $wgUploadDirectory;
 973                         for ( $i = 0; $i < 100 ; $i++ ) {
 974                                 $broken = "$wgUploadDirectory/broken-$i-$thumbName";
 975                                 if ( !file_exists( $broken ) ) {
 976                                         rename( $thumbPath, $broken );
 977                                         break;
 978                                 }
 979                         }
 980                         // Code below will ask if it exists, and the answer is now no
 981                         clearstatcache();
 982                 }
 983
 984                 $done = true;
 985                 if ( !file_exists( $thumbPath ) ||
 986                         filemtime( $thumbPath ) < wfTimestamp( TS_UNIX, $wgThumbnailEpoch ) ) {
 987                         $oldThumbPath = wfDeprecatedThumbDir( $thumbName, 'thumb', $this->fromSharedDirectory ).
 988                                 '/'.$thumbName;
 989                         $done = false;
 990
 991                         // Migration from old directory structure
 992                         if ( is_file( $oldThumbPath ) ) {
 993                                 if ( filemtime($oldThumbPath) >= filemtime($this->imagePath) ) {
 994                                         if ( file_exists( $thumbPath ) ) {
 995                                                 if ( !is_dir( $thumbPath ) ) {
 996                                                         // Old image in the way of rename
 997                                                         unlink( $thumbPath );
 998                                                 } else {
 999                                                         // This should have been dealt with already
1000                                                         wfDebugDieBacktrace( "Directory where image should be: $thumbPath" );
1001                                                 }
1002                                         }
1003                                         // Rename the old image into the new location
1004                                         rename( $oldThumbPath, $thumbPath );
1005                                         $done = true;
1006                                 } else {
1007                                         unlink( $oldThumbPath );
1008                                 }
1009                         }
1010                         if ( !$done ) {
1011                                 $this->lastError = $this->reallyRenderThumb( $thumbPath, $width, $height );
1012                                 if ( $this->lastError === true ) {
1013                                         $done = true;
1014                                 }
1015
1016                                 # Purge squid
1017                                 # This has to be done after the image is updated and present for all machines on NFS,
1018                                 # or else the old version might be stored into the squid again
1019                                 if ( $wgUseSquid ) {
1020                                         if ( substr( $url, 0, 4 ) == 'http' ) {
1021                                                 $urlArr = array( $url );
1022                                         } else {
1023                                                 $urlArr = array( $wgInternalServer.$url );
1024                                         }
1025                                         wfPurgeSquidServers($urlArr);
1026                                 }
1027                         }
1028                 }
1029
1030                 if ( $done ) {
1031                         $thumb = new ThumbnailImage( $url, $width, $height, $thumbPath );
1032                 } else {
1033                         $thumb = null;
1034                 }
1035                 wfProfileOut( $fname );
1036                 return $thumb;
1037         } // END OF function renderThumb
1038
1039         /**
1040          * Really render a thumbnail
1041          * Call this only for images for which canRender() returns true.
1042          *
1043          * @param string $thumbPath Path to thumbnail
1044          * @param int $width Desired width in pixels
1045          * @param int $height Desired height in pixels
1046          * @return bool True on error, false or error string on failure.
1047          * @access private
1048          */
1049         function reallyRenderThumb( $thumbPath, $width, $height ) {
1050                 global $wgSVGConverters, $wgSVGConverter,
1051                         $wgUseImageMagick, $wgImageMagickConvertCommand;
1052
1053                 $this->load();
1054
1055                 $err = false;
1056                 if( $this->mime === "image/svg" ) {
1057                         #Right now we have only SVG
1058
1059                         global $wgSVGConverters, $wgSVGConverter;
1060                         if( isset( $wgSVGConverters[$wgSVGConverter] ) ) {
1061                                 global $wgSVGConverterPath;
1062                                 $cmd = str_replace(
1063                                         array( '$path/', '$width', '$height', '$input', '$output' ),
1064                                         array( $wgSVGConverterPath ? "$wgSVGConverterPath/" : "",
1065                                                    intval( $width ),
1066                                                    intval( $height ),
1067                                                    wfEscapeShellArg( $this->imagePath ),
1068                                                    wfEscapeShellArg( $thumbPath ) ),
1069                                         $wgSVGConverters[$wgSVGConverter] );
1070                                 wfProfileIn( 'rsvg' );
1071                                 wfDebug( "reallyRenderThumb SVG: $cmd\n" );
1072                                 $err = wfShellExec( $cmd );
1073                                 wfProfileOut( 'rsvg' );
1074                         }
1075                 } elseif ( $wgUseImageMagick ) {
1076                         # use ImageMagick
1077
1078                         if ( $this->mime == 'image/jpeg' ) {
1079                                 $quality = "-quality 80"; // 80%
1080                         } elseif ( $this->mime == 'image/png' ) {
1081                                 $quality = "-quality 95"; // zlib 9, adaptive filtering
1082                         } else {
1083                                 $quality = ''; // default
1084                         }
1085
1086                         # Specify white background color, will be used for transparent images
1087                         # in Internet Explorer/Windows instead of default black.
1088
1089                         # Note, we specify "-size {$width}" and NOT "-size {$width}x{$height}".
1090                         # It seems that ImageMagick has a bug wherein it produces thumbnails of
1091                         # the wrong size in the second case.
1092
1093                         $cmd  =  wfEscapeShellArg($wgImageMagickConvertCommand) .
1094                                 " {$quality} -background white -size {$width} ".
1095                                 wfEscapeShellArg($this->imagePath) .
1096                                 // For the -resize option a "!" is needed to force exact size,
1097                                 // or ImageMagick may decide your ratio is wrong and slice off
1098                                 // a pixel.
1099                                 " -resize " . wfEscapeShellArg( "{$width}x{$height}!" ) .
1100                                 " -depth 8 " .
1101                                 wfEscapeShellArg($thumbPath) . " 2>&1";
1102                         wfDebug("reallyRenderThumb: running ImageMagick: $cmd\n");
1103                         wfProfileIn( 'convert' );
1104                         $err = wfShellExec( $cmd );
1105                         wfProfileOut( 'convert' );
1106                 } else {
1107                         # Use PHP's builtin GD library functions.
1108                         #
1109                         # First find out what kind of file this is, and select the correct
1110                         # input routine for this.
1111
1112                         $typemap = array(
1113                                 'image/gif'          => array( 'imagecreatefromgif',  'palette',   'imagegif'  ),
1114                                 'image/jpeg'         => array( 'imagecreatefromjpeg', 'truecolor', array( &$this, 'imageJpegWrapper' ) ),
1115                                 'image/png'          => array( 'imagecreatefrompng',  'bits',      'imagepng'  ),
1116                                 'image/vnd.wap.wmbp' => array( 'imagecreatefromwbmp', 'palette',   'imagewbmp'  ),
1117                                 'image/xbm'          => array( 'imagecreatefromxbm',  'palette',   'imagexbm'  ),
1118                         );
1119                         if( !isset( $typemap[$this->mime] ) ) {
1120                                 $err = 'Image type not supported';
1121                                 wfDebug( "$err\n" );
1122                                 return $err;
1123                         }
1124                         list( $loader, $colorStyle, $saveType ) = $typemap[$this->mime];
1125
1126                         if( !function_exists( $loader ) ) {
1127                                 $err = "Incomplete GD library configuration: missing function $loader";
1128                                 wfDebug( "$err\n" );
1129                                 return $err;
1130                         }
1131                         if( $colorStyle == 'palette' ) {
1132                                 $truecolor = false;
1133                         } elseif( $colorStyle == 'truecolor' ) {
1134                                 $truecolor = true;
1135                         } elseif( $colorStyle == 'bits' ) {
1136                                 $truecolor = ( $this->bits > 8 );
1137                         }
1138
1139                         $src_image = call_user_func( $loader, $this->imagePath );
1140                         if ( $truecolor ) {
1141                                 $dst_image = imagecreatetruecolor( $width, $height );
1142                         } else {
1143                                 $dst_image = imagecreate( $width, $height );
1144                         }
1145                         imagecopyresampled( $dst_image, $src_image,
1146                                                 0,0,0,0,
1147                                                 $width, $height, $this->width, $this->height );
1148                         call_user_func( $saveType, $dst_image, $thumbPath );
1149                         imagedestroy( $dst_image );
1150                         imagedestroy( $src_image );
1151                 }
1152
1153                 #
1154                 # Check for zero-sized thumbnails. Those can be generated when
1155                 # no disk space is available or some other error occurs
1156                 #
1157                 if( file_exists( $thumbPath ) ) {
1158                         $thumbstat = stat( $thumbPath );
1159                         if( $thumbstat['size'] == 0 ) {
1160                                 unlink( $thumbPath );
1161                         } else {
1162                                 // All good
1163                                 $err = true;
1164                         }
1165                 }
1166                 if ( $err !== true ) {
1167                         return wfMsg( 'thumbnail_error', $err );
1168                 } else {
1169                         return true;
1170                 }
1171         }
1172
1173         function getLastError() {
1174                 return $this->lastError;
1175         }
1176
1177         function imageJpegWrapper( $dst_image, $thumbPath ) {
1178                 imageinterlace( $dst_image );
1179                 imagejpeg( $dst_image, $thumbPath, 95 );
1180         }
1181
1182         /**
1183          * Get all thumbnail names previously generated for this image
1184          */
1185         function getThumbnails( $shared = false ) {
1186                 if ( Image::isHashed( $shared ) ) {
1187                         $this->load();
1188                         $files = array();
1189                         $dir = wfImageThumbDir( $this->name, $shared );
1190
1191                         // This generates an error on failure, hence the @
1192                         $handle = @opendir( $dir );
1193
1194                         if ( $handle ) {
1195                                 while ( false !== ( $file = readdir($handle) ) ) {
1196                                         if ( $file{0} != '.' ) {
1197                                                 $files[] = $file;
1198                                         }
1199                                 }
1200                                 closedir( $handle );
1201                         }
1202                 } else {
1203                         $files = array();
1204                 }
1205
1206                 return $files;
1207         }
1208
1209         /**
1210          * Refresh metadata in memcached, but don't touch thumbnails or squid
1211          */
1212         function purgeMetadataCache() {
1213                 clearstatcache();
1214                 $this->loadFromFile();
1215                 $this->saveToCache();
1216         }
1217
1218         /**
1219          * Delete all previously generated thumbnails, refresh metadata in memcached and purge the squid
1220          */
1221         function purgeCache( $archiveFiles = array(), $shared = false ) {
1222                 global $wgInternalServer, $wgUseSquid;
1223
1224                 // Refresh metadata cache
1225                 $this->purgeMetadataCache();
1226
1227                 // Delete thumbnails
1228                 $files = $this->getThumbnails( $shared );
1229                 $dir = wfImageThumbDir( $this->name, $shared );
1230                 $urls = array();
1231                 foreach ( $files as $file ) {
1232                         if ( preg_match( '/^(\d+)px/', $file, $m ) ) {
1233                                 $urls[] = $wgInternalServer . $this->thumbUrl( $m[1], $this->fromSharedDirectory );
1234                                 @unlink( "$dir/$file" );
1235                         }
1236                 }
1237
1238                 // Purge the squid
1239                 if ( $wgUseSquid ) {
1240                         $urls[] = $wgInternalServer . $this->getViewURL();
1241                         foreach ( $archiveFiles as $file ) {
1242                                 $urls[] = $wgInternalServer . wfImageArchiveUrl( $file );
1243                         }
1244                         wfPurgeSquidServers( $urls );
1245                 }
1246         }
1247
1248         function checkDBSchema(&$db) {
1249                 global $wgCheckDBSchema;
1250                 if (!$wgCheckDBSchema) {
1251                         return;
1252                 }
1253                 # img_name must be unique
1254                 if ( !$db->indexUnique( 'image', 'img_name' ) && !$db->indexExists('image','PRIMARY') ) {
1255                         wfDebugDieBacktrace( 'Database schema not up to date, please run maintenance/archives/patch-image_name_unique.sql' );
1256                 }
1257
1258                 #new fields must exist
1259                 if ( !$db->fieldExists( 'image', 'img_media_type' )
1260                   || !$db->fieldExists( 'image', 'img_metadata' )
1261                   || !$db->fieldExists( 'image', 'img_width' ) ) {
1262
1263                         wfDebugDieBacktrace( 'Database schema not up to date, please run maintenance/update.php' );
1264                 }
1265         }
1266
1267         /**
1268          * Return the image history of this image, line by line.
1269          * starts with current version, then old versions.
1270          * uses $this->historyLine to check which line to return:
1271          *  0      return line for current version
1272          *  1      query for old versions, return first one
1273          *  2, ... return next old version from above query
1274          *
1275          * @access public
1276          */
1277         function nextHistoryLine() {
1278                 $fname = 'Image::nextHistoryLine()';
1279                 $dbr =& wfGetDB( DB_SLAVE );
1280
1281                 $this->checkDBSchema($dbr);
1282
1283                 if ( $this->historyLine == 0 ) {// called for the first time, return line from cur
1284                         $this->historyRes = $dbr->select( 'image',
1285                                 array(
1286                                         'img_size',
1287                                         'img_description',
1288                                         'img_user','img_user_text',
1289                                         'img_timestamp',
1290                                         'img_width',
1291                                         'img_height',
1292                                         "'' AS oi_archive_name"
1293                                 ),
1294                                 array( 'img_name' => $this->title->getDBkey() ),
1295                                 $fname
1296                         );
1297                         if ( 0 == wfNumRows( $this->historyRes ) ) {
1298                                 return FALSE;
1299                         }
1300                 } else if ( $this->historyLine == 1 ) {
1301                         $this->historyRes = $dbr->select( 'oldimage',
1302                                 array(
1303                                         'oi_size AS img_size',
1304                                         'oi_description AS img_description',
1305                                         'oi_user AS img_user',
1306                                         'oi_user_text AS img_user_text',
1307                                         'oi_timestamp AS img_timestamp',
1308                                         'oi_width as img_width',
1309                                         'oi_height as img_height',
1310                                         'oi_archive_name'
1311                                 ),
1312                                 array( 'oi_name' => $this->title->getDBkey() ),
1313                                 $fname,
1314                                 array( 'ORDER BY' => 'oi_timestamp DESC' )
1315                         );
1316                 }
1317                 $this->historyLine ++;
1318
1319                 return $dbr->fetchObject( $this->historyRes );
1320         }
1321
1322         /**
1323          * Reset the history pointer to the first element of the history
1324          * @access public
1325          */
1326         function resetHistory() {
1327                 $this->historyLine = 0;
1328         }
1329
1330         /**
1331         * Return the full filesystem path to the file. Note that this does
1332         * not mean that a file actually exists under that location.
1333         *
1334         * This path depends on whether directory hashing is active or not,
1335         * i.e. whether the images are all found in the same directory,
1336         * or in hashed paths like /images/3/3c.
1337         *
1338         * @access public
1339         * @param boolean $fromSharedDirectory Return the path to the file
1340         *   in a shared repository (see $wgUseSharedRepository and related
1341         *   options in DefaultSettings.php) instead of a local one.
1342         *
1343         */
1344         function getFullPath( $fromSharedRepository = false ) {
1345                 global $wgUploadDirectory, $wgSharedUploadDirectory;
1346
1347                 $dir      = $fromSharedRepository ? $wgSharedUploadDirectory :
1348                                                     $wgUploadDirectory;
1349
1350                 // $wgSharedUploadDirectory may be false, if thumb.php is used
1351                 if ( $dir ) {
1352                         $fullpath = $dir . wfGetHashPath($this->name, $fromSharedRepository) . $this->name;
1353                 } else {
1354                         $fullpath = false;
1355                 }
1356
1357                 return $fullpath;
1358         }
1359
1360         /**
1361          * @return bool
1362          * @static
1363          */
1364         function isHashed( $shared ) {
1365                 global $wgHashedUploadDirectory, $wgHashedSharedUploadDirectory;
1366                 return $shared ? $wgHashedSharedUploadDirectory : $wgHashedUploadDirectory;
1367         }
1368
1369         /**
1370          * Record an image upload in the upload log and the image table
1371          */
1372         function recordUpload( $oldver, $desc, $license = '', $copyStatus = '', $source = '', $watch = false ) {
1373                 global $wgUser, $wgUseCopyrightUpload, $wgUseSquid, $wgPostCommitUpdateList;
1374
1375                 $fname = 'Image::recordUpload';
1376                 $dbw =& wfGetDB( DB_MASTER );
1377
1378                 $this->checkDBSchema($dbw);
1379
1380                 // Delete thumbnails and refresh the metadata cache
1381                 $this->purgeCache();
1382
1383                 // Fail now if the image isn't there
1384                 if ( !$this->fileExists || $this->fromSharedDirectory ) {
1385                         wfDebug( "Image::recordUpload: File ".$this->imagePath." went missing!\n" );
1386                         return false;
1387                 }
1388
1389                 if ( $wgUseCopyrightUpload ) {
1390                         if ( $license != '' ) {
1391                                 $licensetxt = '== ' . wfMsgForContent( 'license' ) . " ==\n" . '{{' . $license . '}}' . "\n";
1392                         }
1393                         $textdesc = '== ' . wfMsg ( 'filedesc' ) . " ==\n" . $desc . "\n" .
1394                           '== ' . wfMsgForContent ( 'filestatus' ) . " ==\n" . $copyStatus . "\n" .
1395                           "$licensetxt" .
1396                           '== ' . wfMsgForContent ( 'filesource' ) . " ==\n" . $source ;
1397                 } else {
1398                         if ( $license != '' ) {
1399                                 $filedesc = $desc == '' ? '' : '== ' . wfMsg ( 'filedesc' ) . " ==\n" . $desc . "\n";
1400                                  $textdesc = $filedesc .
1401                                          '== ' . wfMsgForContent ( 'license' ) . " ==\n" . '{{' . $license . '}}' . "\n";
1402                         } else {
1403                                 $textdesc = $desc;
1404                         }
1405                 }
1406
1407                 $now = $dbw->timestamp();
1408
1409                 #split mime type
1410                 if (strpos($this->mime,'/')!==false) {
1411                         list($major,$minor)= explode('/',$this->mime,2);
1412                 }
1413                 else {
1414                         $major= $this->mime;
1415                         $minor= "unknown";
1416                 }
1417
1418                 # Test to see if the row exists using INSERT IGNORE
1419                 # This avoids race conditions by locking the row until the commit, and also
1420                 # doesn't deadlock. SELECT FOR UPDATE causes a deadlock for every race condition.
1421                 $dbw->insert( 'image',
1422                         array(
1423                                 'img_name' => $this->name,
1424                                 'img_size'=> $this->size,
1425                                 'img_width' => intval( $this->width ),
1426                                 'img_height' => intval( $this->height ),
1427                                 'img_bits' => $this->bits,
1428                                 'img_media_type' => $this->type,
1429                                 'img_major_mime' => $major,
1430                                 'img_minor_mime' => $minor,
1431                                 'img_timestamp' => $now,
1432                                 'img_description' => $desc,
1433                                 'img_user' => $wgUser->getID(),
1434                                 'img_user_text' => $wgUser->getName(),
1435                                 'img_metadata' => $this->metadata,
1436                         ),
1437                         $fname,
1438                         'IGNORE'
1439                 );
1440                 $descTitle = $this->getTitle();
1441                 $purgeURLs = array();
1442
1443                 if( $dbw->affectedRows() == 0 ) {
1444                         # Collision, this is an update of an image
1445                         # Insert previous contents into oldimage
1446                         $dbw->insertSelect( 'oldimage', 'image',
1447                                 array(
1448                                         'oi_name' => 'img_name',
1449                                         'oi_archive_name' => $dbw->addQuotes( $oldver ),
1450                                         'oi_size' => 'img_size',
1451                                         'oi_width' => 'img_width',
1452                                         'oi_height' => 'img_height',
1453                                         'oi_bits' => 'img_bits',
1454                                         'oi_timestamp' => 'img_timestamp',
1455                                         'oi_description' => 'img_description',
1456                                         'oi_user' => 'img_user',
1457                                         'oi_user_text' => 'img_user_text',
1458                                 ), array( 'img_name' => $this->name ), $fname
1459                         );
1460
1461                         # Update the current image row
1462                         $dbw->update( 'image',
1463                                 array( /* SET */
1464                                         'img_size' => $this->size,
1465                                         'img_width' => intval( $this->width ),
1466                                         'img_height' => intval( $this->height ),
1467                                         'img_bits' => $this->bits,
1468                                         'img_media_type' => $this->type,
1469                                         'img_major_mime' => $major,
1470                                         'img_minor_mime' => $minor,
1471                                         'img_timestamp' => $now,
1472                                         'img_description' => $desc,
1473                                         'img_user' => $wgUser->getID(),
1474                                         'img_user_text' => $wgUser->getName(),
1475                                         'img_metadata' => $this->metadata,
1476                                 ), array( /* WHERE */
1477                                         'img_name' => $this->name
1478                                 ), $fname
1479                         );
1480                 }
1481
1482                 $article = new Article( $descTitle );
1483                 $minor = false;
1484                 $watch = $watch || $wgUser->isWatched( $descTitle );
1485                 $suppressRC = true; // There's already a log entry, so don't double the RC load
1486
1487                 if( $descTitle->exists() ) {
1488                         // TODO: insert a null revision into the page history for this update.
1489                         if( $watch ) {
1490                                 $wgUser->addWatch( $descTitle );
1491                         }
1492
1493                         # Invalidate the cache for the description page
1494                         $descTitle->invalidateCache();
1495                         $purgeURLs[] = $descTitle->getInternalURL();
1496                 } else {
1497                         // New image; create the description page.
1498                         $article->insertNewArticle( $textdesc, $desc, $minor, $watch, $suppressRC );
1499                 }
1500
1501                 # Invalidate cache for all pages using this image
1502                 $linksTo = $this->getLinksTo();
1503
1504                 if ( $wgUseSquid ) {
1505                         $u = SquidUpdate::newFromTitles( $linksTo, $purgeURLs );
1506                         array_push( $wgPostCommitUpdateList, $u );
1507                 }
1508                 Title::touchArray( $linksTo );
1509
1510                 $log = new LogPage( 'upload' );
1511                 $log->addEntry( 'upload', $descTitle, $desc );
1512
1513                 return true;
1514         }
1515
1516         /**
1517          * Get an array of Title objects which are articles which use this image
1518          * Also adds their IDs to the link cache
1519          *
1520          * This is mostly copied from Title::getLinksTo()
1521          */
1522         function getLinksTo( $options = '' ) {
1523                 $fname = 'Image::getLinksTo';
1524                 wfProfileIn( $fname );
1525
1526                 if ( $options ) {
1527                         $db =& wfGetDB( DB_MASTER );
1528                 } else {
1529                         $db =& wfGetDB( DB_SLAVE );
1530                 }
1531                 $linkCache =& LinkCache::singleton();
1532
1533                 extract( $db->tableNames( 'page', 'imagelinks' ) );
1534                 $encName = $db->addQuotes( $this->name );
1535                 $sql = "SELECT page_namespace,page_title,page_id FROM $page,$imagelinks WHERE page_id=il_from AND il_to=$encName $options";
1536                 $res = $db->query( $sql, $fname );
1537
1538                 $retVal = array();
1539                 if ( $db->numRows( $res ) ) {
1540                         while ( $row = $db->fetchObject( $res ) ) {
1541                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1542                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj );
1543                                         $retVal[] = $titleObj;
1544                                 }
1545                         }
1546                 }
1547                 $db->freeResult( $res );
1548                 wfProfileOut( $fname );
1549                 return $retVal;
1550         }
1551         /**
1552          * Retrive Exif data from the database
1553          *
1554          * Retrive Exif data from the database and prune unrecognized tags
1555          * and/or tags with invalid contents
1556          *
1557          * @return array
1558          */
1559         function retrieveExifData() {
1560                 if ( $this->getMimeType() !== "image/jpeg" )
1561                         return array();
1562
1563                 $exif = new Exif( $this->imagePath );
1564                 return $exif->getFilteredData();
1565         }
1566
1567         function getExifData() {
1568                 global $wgRequest;
1569                 if ( $this->metadata === '0' )
1570                         return array();
1571
1572                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
1573                 $ret = unserialize( $this->metadata );
1574
1575                 $oldver = isset( $ret['MEDIAWIKI_EXIF_VERSION'] ) ? $ret['MEDIAWIKI_EXIF_VERSION'] : 0;
1576                 $newver = Exif::version();
1577
1578                 if ( !count( $ret ) || $purge || $oldver != $newver ) {
1579                         $this->purgeMetadataCache();
1580                         $this->updateExifData( $newver );
1581                 }
1582                 if ( isset( $ret['MEDIAWIKI_EXIF_VERSION'] ) )
1583                         unset( $ret['MEDIAWIKI_EXIF_VERSION'] );
1584                 $format = new FormatExif( $ret );
1585
1586                 return $format->getFormattedData();
1587         }
1588
1589         function updateExifData( $version ) {
1590                 $fname = 'Image:updateExifData';
1591
1592                 if ( $this->getImagePath() === false ) # Not a local image
1593                         return;
1594
1595                 # Get EXIF data from image
1596                 $exif = $this->retrieveExifData();
1597                 if ( count( $exif ) ) {
1598                         $exif['MEDIAWIKI_EXIF_VERSION'] = $version;
1599                         $this->metadata = serialize( $exif );
1600                 } else {
1601                         $this->metadata = '0';
1602                 }
1603
1604                 # Update EXIF data in database
1605                 $dbw =& wfGetDB( DB_MASTER );
1606
1607                 $this->checkDBSchema($dbw);
1608
1609                 $dbw->update( 'image',
1610                         array( 'img_metadata' => $this->metadata ),
1611                         array( 'img_name' => $this->name ),
1612                         $fname
1613                 );
1614         }
1615
1616         /**
1617          * Returns true if the image does not come from the shared
1618          * image repository.
1619          *
1620          * @return bool
1621          */
1622         function isLocal() {
1623                 return !$this->fromSharedDirectory;
1624         }
1625
1626 } //class
1627
1628
1629 /**
1630  * Returns the image directory of an image
1631  * If the directory does not exist, it is created.
1632  * The result is an absolute path.
1633  *
1634  * This function is called from thumb.php before Setup.php is included
1635  *
1636  * @param string $fname         file name of the image file
1637  * @access public
1638  */
1639 function wfImageDir( $fname ) {
1640         global $wgUploadDirectory, $wgHashedUploadDirectory;
1641
1642         if (!$wgHashedUploadDirectory) { return $wgUploadDirectory; }
1643
1644         $hash = md5( $fname );
1645         $oldumask = umask(0);
1646         $dest = $wgUploadDirectory . '/' . $hash{0};
1647         if ( ! is_dir( $dest ) ) { mkdir( $dest, 0777 ); }
1648         $dest .= '/' . substr( $hash, 0, 2 );
1649         if ( ! is_dir( $dest ) ) { mkdir( $dest, 0777 ); }
1650
1651         umask( $oldumask );
1652         return $dest;
1653 }
1654
1655 /**
1656  * Returns the image directory of an image's thubnail
1657  * If the directory does not exist, it is created.
1658  * The result is an absolute path.
1659  *
1660  * This function is called from thumb.php before Setup.php is included
1661  *
1662  * @param string $fname         file name of the original image file
1663  * @param string $subdir        (optional) subdirectory of the image upload directory that should be used for storing the thumbnail. Default is 'thumb'
1664  * @param boolean $shared       (optional) use the shared upload directory
1665  * @access public
1666  */
1667 function wfImageThumbDir( $fname, $shared = false ) {
1668         $base = wfImageArchiveDir( $fname, 'thumb', $shared );
1669         if ( Image::isHashed( $shared ) ) {
1670                 $dir =  "$base/$fname";
1671
1672                 if ( !is_dir( $base ) ) {
1673                         $oldumask = umask(0);
1674                         @mkdir( $base, 0777 );
1675                         umask( $oldumask );
1676                 }
1677
1678                 if ( ! is_dir( $dir ) ) {
1679                         if ( is_file( $dir ) ) {
1680                                 // Old thumbnail in the way of directory creation, kill it
1681                                 unlink( $dir );
1682                         }
1683                         $oldumask = umask(0);
1684                         @mkdir( $dir, 0777 );
1685                         umask( $oldumask );
1686                 }
1687         } else {
1688                 $dir = $base;
1689         }
1690
1691         return $dir;
1692 }
1693
1694 /**
1695  * Old thumbnail directory, kept for conversion
1696  */
1697 function wfDeprecatedThumbDir( $thumbName , $subdir='thumb', $shared=false) {
1698         return wfImageArchiveDir( $thumbName, $subdir, $shared );
1699 }
1700
1701 /**
1702  * Returns the image directory of an image's old version
1703  * If the directory does not exist, it is created.
1704  * The result is an absolute path.
1705  *
1706  * This function is called from thumb.php before Setup.php is included
1707  *
1708  * @param string $fname         file name of the thumbnail file, including file size prefix
1709  * @param string $subdir        (optional) subdirectory of the image upload directory that should be used for storing the old version. Default is 'archive'
1710  * @param boolean $shared       (optional) use the shared upload directory (only relevant for other functions which call this one)
1711  * @access public
1712  */
1713 function wfImageArchiveDir( $fname , $subdir='archive', $shared=false ) {
1714         global $wgUploadDirectory, $wgHashedUploadDirectory,
1715                $wgSharedUploadDirectory, $wgHashedSharedUploadDirectory;
1716         $dir = $shared ? $wgSharedUploadDirectory : $wgUploadDirectory;
1717         $hashdir = $shared ? $wgHashedSharedUploadDirectory : $wgHashedUploadDirectory;
1718         if (!$hashdir) { return $dir.'/'.$subdir; }
1719         $hash = md5( $fname );
1720         $oldumask = umask(0);
1721
1722         # Suppress warning messages here; if the file itself can't
1723         # be written we'll worry about it then.
1724         wfSuppressWarnings();
1725
1726         $archive = $dir.'/'.$subdir;
1727         if ( ! is_dir( $archive ) ) { mkdir( $archive, 0777 ); }
1728         $archive .= '/' . $hash{0};
1729         if ( ! is_dir( $archive ) ) { mkdir( $archive, 0777 ); }
1730         $archive .= '/' . substr( $hash, 0, 2 );
1731         if ( ! is_dir( $archive ) ) { mkdir( $archive, 0777 ); }
1732
1733         wfRestoreWarnings();
1734         umask( $oldumask );
1735         return $archive;
1736 }
1737
1738
1739 /*
1740  * Return the hash path component of an image path (URL or filesystem),
1741  * e.g. "/3/3c/", or just "/" if hashing is not used.
1742  *
1743  * @param $dbkey The filesystem / database name of the file
1744  * @param $fromSharedDirectory Use the shared file repository? It may
1745  *   use different hash settings from the local one.
1746  */
1747 function wfGetHashPath ( $dbkey, $fromSharedDirectory = false ) {
1748         if( Image::isHashed( $fromSharedDirectory ) ) {
1749                 $hash = md5($dbkey);
1750                 return '/' . $hash{0} . '/' . substr( $hash, 0, 2 ) . '/';
1751         } else {
1752                 return '/';
1753         }
1754 }
1755
1756 /**
1757  * Returns the image URL of an image's old version
1758  *
1759  * @param string $fname         file name of the image file
1760  * @param string $subdir        (optional) subdirectory of the image upload directory that is used by the old version. Default is 'archive'
1761  * @access public
1762  */
1763 function wfImageArchiveUrl( $name, $subdir='archive' ) {
1764         global $wgUploadPath, $wgHashedUploadDirectory;
1765
1766         if ($wgHashedUploadDirectory) {
1767                 $hash = md5( substr( $name, 15) );
1768                 $url = $wgUploadPath.'/'.$subdir.'/' . $hash{0} . '/' .
1769                   substr( $hash, 0, 2 ) . '/'.$name;
1770         } else {
1771                 $url = $wgUploadPath.'/'.$subdir.'/'.$name;
1772         }
1773         return wfUrlencode($url);
1774 }
1775
1776 /**
1777  * Return a rounded pixel equivalent for a labeled CSS/SVG length.
1778  * http://www.w3.org/TR/SVG11/coords.html#UnitIdentifiers
1779  *
1780  * @param string $length
1781  * @return int Length in pixels
1782  */
1783 function wfScaleSVGUnit( $length ) {
1784         static $unitLength = array(
1785                 'px' => 1.0,
1786                 'pt' => 1.25,
1787                 'pc' => 15.0,
1788                 'mm' => 3.543307,
1789                 'cm' => 35.43307,
1790                 'in' => 90.0,
1791                 ''   => 1.0, // "User units" pixels by default
1792                 '%'  => 2.0, // Fake it!
1793                 );
1794         if( preg_match( '/^(\d+(?:\.\d+)?)(em|ex|px|pt|pc|cm|mm|in|%|)$/', $length, $matches ) ) {
1795                 $length = floatval( $matches[1] );
1796                 $unit = $matches[2];
1797                 return round( $length * $unitLength[$unit] );
1798         } else {
1799                 // Assume pixels
1800                 return round( floatval( $length ) );
1801         }
1802 }
1803
1804 /**
1805  * Compatible with PHP getimagesize()
1806  * @todo support gzipped SVGZ
1807  * @todo check XML more carefully
1808  * @todo sensible defaults
1809  *
1810  * @param string $filename
1811  * @return array
1812  */
1813 function wfGetSVGsize( $filename ) {
1814         $width = 256;
1815         $height = 256;
1816
1817         // Read a chunk of the file
1818         $f = fopen( $filename, "rt" );
1819         if( !$f ) return false;
1820         $chunk = fread( $f, 4096 );
1821         fclose( $f );
1822
1823         // Uber-crappy hack! Run through a real XML parser.
1824         if( !preg_match( '/<svg\s*([^>]*)\s*>/s', $chunk, $matches ) ) {
1825                 return false;
1826         }
1827         $tag = $matches[1];
1828         if( preg_match( '/\bwidth\s*=\s*("[^"]+"|\'[^\']+\')/s', $tag, $matches ) ) {
1829                 $width = wfScaleSVGUnit( trim( substr( $matches[1], 1, -1 ) ) );
1830         }
1831         if( preg_match( '/\bheight\s*=\s*("[^"]+"|\'[^\']+\')/s', $tag, $matches ) ) {
1832                 $height = wfScaleSVGUnit( trim( substr( $matches[1], 1, -1 ) ) );
1833         }
1834
1835         return array( $width, $height, 'SVG',
1836                 "width=\"$width\" height=\"$height\"" );
1837 }
1838
1839 /**
1840  * Determine if an image exists on the 'bad image list'
1841  *
1842  * @param string $name The image to check
1843  * @return bool
1844  */
1845 function wfIsBadImage( $name ) {
1846         global $wgContLang;
1847         static $titleList = false;
1848         if ( $titleList === false ) {
1849                 $titleList = array();
1850
1851                 $lines = explode("\n", wfMsgForContent( 'bad_image_list' ));
1852                 foreach ( $lines as $line ) {
1853                         if ( preg_match( '/^\*\s*\[{2}:(' . $wgContLang->getNsText( NS_IMAGE ) . ':.*?)\]{2}/', $line, $m ) ) {
1854                                 $t = Title::newFromText( $m[1] );
1855                                 $titleList[$t->getDBkey()] = 1;
1856                         }
1857                 }
1858         }
1859
1860         return array_key_exists( $name, $titleList );
1861 }
1862
1863
1864
1865 /**
1866  * Wrapper class for thumbnail images
1867  * @package MediaWiki
1868  */
1869 class ThumbnailImage {
1870         /**
1871          * @param string $path Filesystem path to the thumb
1872          * @param string $url URL path to the thumb
1873          * @access private
1874          */
1875         function ThumbnailImage( $url, $width, $height, $path = false ) {
1876                 $this->url = $url;
1877                 $this->width = round( $width );
1878                 $this->height = round( $height );
1879                         # These should be integers when they get here.
1880                         # If not, there's a bug somewhere.  But let's at
1881                         # least produce valid HTML code regardless.
1882                 $this->path = $path;
1883         }
1884
1885         /**
1886          * @return string The thumbnail URL
1887          */
1888         function getUrl() {
1889                 return $this->url;
1890         }
1891
1892         /**
1893          * Return HTML <img ... /> tag for the thumbnail, will include
1894          * width and height attributes and a blank alt text (as required).
1895          *
1896          * You can set or override additional attributes by passing an
1897          * associative array of name => data pairs. The data will be escaped
1898          * for HTML output, so should be in plaintext.
1899          *
1900          * @param array $attribs
1901          * @return string
1902          * @access public
1903          */
1904         function toHtml( $attribs = array() ) {
1905                 $attribs['src'] = $this->url;
1906                 $attribs['width'] = $this->width;
1907                 $attribs['height'] = $this->height;
1908                 if( !isset( $attribs['alt'] ) ) $attribs['alt'] = '';
1909
1910                 $html = '<img ';
1911                 foreach( $attribs as $name => $data ) {
1912                         $html .= $name . '="' . htmlspecialchars( $data ) . '" ';
1913                 }
1914                 $html .= '/>';
1915                 return $html;
1916         }
1917
1918 }
1919
1920 /**
1921  * Calculate the largest thumbnail width for a given original file size
1922  * such that the thumbnail's height is at most $maxHeight.
1923  * @param int $boxWidth
1924  * @param int $boxHeight
1925  * @param int $maxHeight
1926  * @return int
1927  */
1928 function wfFitBoxWidth( $boxWidth, $boxHeight, $maxHeight ) {
1929         $idealWidth = $boxWidth * $maxHeight / $boxHeight;
1930         $roundedUp = ceil( $idealWidth );
1931         if( round( $roundedUp * $boxHeight / $boxWidth ) > $maxHeight )
1932                 return floor( $idealWidth );
1933         else
1934                 return $roundedUp;
1935 }
1936
1937 ?>