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,        #  |
  18                 $bits,          #   --- returned by getimagesize, see http://de3.php.net/manual/en/function.getimagesize.php
  19                 $type,          #  |
  20                 $attr;          # /
  21
  22
  23
  24         function Image( $name )
  25         {
  26                 global $wgUploadDirectory;
  27
  28                 $this->name      = $name;
  29                 $this->title     = Title::makeTitle( Namespace::getImage(), $this->name );
  30                 //$this->imagePath = wfImagePath( $name );
  31                 $hash            = md5( $this->title->getDBkey() );
  32                 $this->imagePath = $wgUploadDirectory . "/" . $hash{0} . "/" .substr( $hash, 0, 2 ) . "/{$name}";
  33
  34                 $this->url       = $this->wfImageUrl( $name );
  35
  36                 if ( $this->fileExists = file_exists( $this->imagePath ) ) // Sic!, "=" is intended
  37                 {
  38                         @$gis = getimagesize( $this->imagePath );
  39                         if( $gis !== false ) {
  40                                 $this->width = $gis[0];
  41                                 $this->height = $gis[1];
  42                                 $this->type = $gis[2];
  43                                 $this->attr = $gis[3];
  44                                 if ( isset( $gis["bits"] ) )  {
  45                                         $this->bits = $gis["bits"];
  46                                 } else {
  47                                         $this->bits = 0;
  48                                 }
  49                         }
  50                 }
  51                 $this->historyLine = 0;
  52         }
  53
  54         function newFromTitle( $nt )
  55         {
  56                 $img = new Image( $nt->getDBKey() );
  57                 $img->title = $nt;
  58                 return $img;
  59         }
  60
  61         function getName()
  62         {
  63                 return $this->name;
  64         }
  65
  66         function getURL()
  67         {
  68                 return $this->url;
  69         }
  70
  71         function getImagePath()
  72         {
  73                 return $this->imagePath;
  74         }
  75
  76         function getWidth()
  77         {
  78                 return $this->width;
  79         }
  80
  81         function getHeight()
  82         {
  83                 return $this->height;
  84         }
  85
  86         function getType()
  87         {
  88                 return $this->type;
  89         }
  90
  91         function getEscapeLocalURL()
  92         {
  93                 return $this->title->escapeLocalURL();
  94         }
  95
  96         function wfImageUrl( $name )
  97         {
  98                 global $wgUploadPath;
  99                 $hash = md5( $name );
 100
 101                 $url = "{$wgUploadPath}/" . $hash{0} . "/" .
 102                 substr( $hash, 0, 2 ) . "/{$name}";
 103                 return wfUrlencode( $url );
 104         }
 105
 106
 107         function exists()
 108         {
 109                 return $this->fileExists;
 110         }
 111
 112         function thumbUrl( $width, $subdir="thumb" ) {
 113                 global $wgUploadPath;
 114
 115                 $name = $this->thumbName( $width );
 116                 $hash = md5( $name );
 117                 $url = "{$wgUploadPath}/{$subdir}/" . $hash{0} . "/" . substr( $hash, 0, 2 ) . "/{$name}";
 118
 119                 return wfUrlencode($url);
 120         }
 121
 122         function thumbName( $width ) {
 123                 return $width."px-".$this->name;
 124         }
 125
 126         //**********************************************************************
 127         // Create a thumbnail of the image having the specified width.
 128         // The thumbnail will not be created if the width is larger than the
 129         // image's width. Let the browser do the scaling in this case.
 130         // The thumbnail is stored on disk and is only computed if the thumbnail
 131         // file does not exist OR if it is older than the image.
 132         function createThumb( $width ) {
 133                 global $wgUploadDirectory;
 134                 global $wgImageMagickConvertCommand;
 135                 global $wgUseImageMagick;
 136                 global $wgUseSquid, $wgInternalServer;
 137
 138                 $width = IntVal( $width );
 139
 140                 $thumbName = $this->thumbName( $width );
 141                 $thumbPath = wfImageThumbDir( $thumbName )."/".$thumbName;
 142                 $thumbUrl  = $this->thumbUrl( $width );
 143
 144                 if ( ! $this->exists() )
 145                 {
 146                         # If there is no image, there will be no thumbnail
 147                         return "";
 148                 }
 149
 150                 # Sanity check $width
 151                 if( $width <= 0 ) {
 152                         # BZZZT
 153                         return "";
 154                 }
 155
 156                 if( $width > $this->width ) {
 157                         # Don't make an image bigger than the source
 158                         return $this->getURL();
 159                 }
 160
 161                 if (    (! file_exists( $thumbPath ) )
 162                      || ( filemtime($thumbPath) < filemtime($this->imagePath) ) ) {
 163                         # Squid purging
 164                         if ( $wgUseSquid ) {
 165                                 $urlArr = Array(
 166                                         $wgInternalServer.$thumbUrl
 167                                 );
 168                                 wfPurgeSquidServers($urlArr);
 169                         }
 170
 171                         if ( $wgUseImageMagick ) {
 172                                 # use ImageMagick
 173                                 $cmd  =  $wgImageMagickConvertCommand .
 174                                         " -quality 85 -geometry {$width} ".
 175                                         escapeshellarg($this->imagePath) . " " .
 176                                         escapeshellarg($thumbPath);
 177                                 $conv = shell_exec( $cmd );
 178                         } else {
 179                                 # Use PHP's builtin GD library functions.
 180                                 #
 181                                 # First find out what kind of file this is, and select the correct
 182                                 # input routine for this.
 183
 184                                 $truecolor = false;
 185
 186                                 switch( $this->type ) {
 187                                         case 1: # GIF
 188                                                 $src_image = imagecreatefromgif( $this->imagePath );
 189                                                 break;
 190                                         case 2: # JPG
 191                                                 $src_image = imagecreatefromjpeg( $this->imagePath );
 192                                                 $truecolor = true;
 193                                                 break;
 194                                         case 3: # PNG
 195                                                 $src_image = imagecreatefrompng( $this->imagePath );
 196                                                 $truecolor = ( $this->bits > 8 );
 197                                                 break;
 198                                         case 15: # WBMP for WML
 199                                                 $src_image = imagecreatefromwbmp( $this->imagePath );
 200                                                 break;
 201                                         case 16: # XBM
 202                                                 $src_image = imagecreatefromxbm( $this->imagePath );
 203                                                 break;
 204                                         default:
 205                                                 return "Image type not supported";
 206                                                 break;
 207                                 }
 208                                 $height = floor( $this->height * ( $width/$this->width ) );
 209                                 if ( $truecolor ) {
 210                                         $dst_image = imagecreatetruecolor( $width, $height );
 211                                 } else {
 212                                         $dst_image = imagecreate( $width, $height );
 213                                 }
 214                                 imagecopyresampled( $dst_image, $src_image,
 215                                                         0,0,0,0,
 216                                                         $width, $height, $this->width, $this->height );
 217                                 switch( $this->type ) {
 218                                         case 1:  # GIF
 219                                         case 3:  # PNG
 220                                         case 15: # WBMP
 221                                         case 16: # XBM
 222                                                 #$thumbUrl .= ".png";
 223                                                 #$thumbPath .= ".png";
 224                                                 imagepng( $dst_image, $thumbPath );
 225                                                 break;
 226                                         case 2:  # JPEG
 227                                                 #$thumbUrl .= ".jpg";
 228                                                 #$thumbPath .= ".jpg";
 229                                                 imageinterlace( $dst_image );
 230                                                 imagejpeg( $dst_image, $thumbPath, 95 );
 231                                                 break;
 232                                         default:
 233                                                 break;
 234                                 }
 235                                 imagedestroy( $dst_image );
 236                                 imagedestroy( $src_image );
 237
 238
 239                         }
 240                         #
 241                         # Check for zero-sized thumbnails. Those can be generated when
 242                         # no disk space is available or some other error occurs
 243                         #
 244                         $thumbstat = stat( $thumbPath );
 245                         if( $thumbstat["size"] == 0 )
 246                         {
 247                                 unlink( $thumbPath );
 248                         }
 249
 250                 }
 251                 return $thumbUrl;
 252         } // END OF function createThumb
 253
 254         //**********************************************************************
 255         // Return the image history of this image, line by line.
 256         // starts with current version, then old versions.
 257         // uses $this->historyLine to check which line to return:
 258         //  0      return line for current version
 259         //  1      query for old versions, return first one
 260         //  2, ... return next old version from above query
 261         function nextHistoryLine()
 262         {
 263                 $fname = "Image::nextHistoryLine()";
 264                 $dbr =& wfGetDB( DB_SLAVE );
 265                 if ( $this->historyLine == 0 ) {// called for the first time, return line from cur
 266                         $this->historyRes = $dbr->select( 'image',
 267                                 array( 'img_size','img_description','img_user','img_user_text','img_timestamp', "'' AS oi_archive_name" ),
 268                                 array( 'img_name' => $this->title->getDBkey() ),
 269                                 $fname
 270                         );
 271                         if ( 0 == wfNumRows( $this->historyRes ) ) {
 272                                 return FALSE;
 273                         }
 274                 } else if ( $this->historyLine == 1 ) {
 275                         $this->historyRes = $dbr->select( 'oldimage',
 276                                 array( 'oi_size AS img_size', 'oi_description AS img_description', 'oi_user AS img_user',
 277                                         'oi_user_text AS img_user_text', 'oi_timestamp AS img_timestamp', 'oi_archive_name'
 278                                 ), array( 'oi_name' => $this->title->getDBkey() ), $fname, array( 'ORDER BY' => 'oi_timestamp DESC' )
 279                         );
 280                 }
 281                 $this->historyLine ++;
 282
 283                 return $dbr->fetchObject( $this->historyRes );
 284         }
 285
 286         function resetHistory()
 287         {
 288                 $this->historyLine = 0;
 289         }
 290
 291
 292 } //class
 293