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         // Returns the URL.
 133         function createThumb( $width ) {
 134                 global $wgUploadDirectory;
 135                 global $wgImageMagickConvertCommand;
 136                 global $wgUseImageMagick;
 137                 global $wgUseSquid, $wgInternalServer;
 138
 139                 $width = IntVal( $width );
 140
 141                 $thumbName = $this->thumbName( $width );
 142                 $thumbPath = wfImageThumbDir( $thumbName )."/".$thumbName;
 143                 $thumbUrl  = $this->thumbUrl( $width );
 144
 145                 if ( ! $this->exists() )
 146                 {
 147                         # If there is no image, there will be no thumbnail
 148                         return "";
 149                 }
 150
 151                 # Sanity check $width
 152                 if( $width <= 0 ) {
 153                         # BZZZT
 154                         return "";
 155                 }
 156
 157                 if( $width > $this->width ) {
 158                         # Don't make an image bigger than the source
 159                         return $this->getURL();
 160                 }
 161
 162                 if ( (! file_exists( $thumbPath ) ) || ( filemtime($thumbPath) < filemtime($this->imagePath) ) ) {
 163                         if ( $wgUseImageMagick ) {
 164                                 # use ImageMagick
 165                                 # Specify white background color, will be used for transparent images
 166                                 # in Internet Explorer/Windows instead of default black.
 167                                 $cmd  =  $wgImageMagickConvertCommand .
 168                                         " -quality 85 -background white -geometry {$width} ".
 169                                         escapeshellarg($this->imagePath) . " " .
 170                                         escapeshellarg($thumbPath);
 171                                 $conv = shell_exec( $cmd );
 172                         } else {
 173                                 # Use PHP's builtin GD library functions.
 174                                 #
 175                                 # First find out what kind of file this is, and select the correct
 176                                 # input routine for this.
 177
 178                                 $truecolor = false;
 179
 180                                 switch( $this->type ) {
 181                                         case 1: # GIF
 182                                                 $src_image = imagecreatefromgif( $this->imagePath );
 183                                                 break;
 184                                         case 2: # JPG
 185                                                 $src_image = imagecreatefromjpeg( $this->imagePath );
 186                                                 $truecolor = true;
 187                                                 break;
 188                                         case 3: # PNG
 189                                                 $src_image = imagecreatefrompng( $this->imagePath );
 190                                                 $truecolor = ( $this->bits > 8 );
 191                                                 break;
 192                                         case 15: # WBMP for WML
 193                                                 $src_image = imagecreatefromwbmp( $this->imagePath );
 194                                                 break;
 195                                         case 16: # XBM
 196                                                 $src_image = imagecreatefromxbm( $this->imagePath );
 197                                                 break;
 198                                         default:
 199                                                 return "Image type not supported";
 200                                                 break;
 201                                 }
 202                                 $height = floor( $this->height * ( $width/$this->width ) );
 203                                 if ( $truecolor ) {
 204                                         $dst_image = imagecreatetruecolor( $width, $height );
 205                                 } else {
 206                                         $dst_image = imagecreate( $width, $height );
 207                                 }
 208                                 imagecopyresampled( $dst_image, $src_image,
 209                                                         0,0,0,0,
 210                                                         $width, $height, $this->width, $this->height );
 211                                 switch( $this->type ) {
 212                                         case 1:  # GIF
 213                                         case 3:  # PNG
 214                                         case 15: # WBMP
 215                                         case 16: # XBM
 216                                                 #$thumbUrl .= ".png";
 217                                                 #$thumbPath .= ".png";
 218                                                 imagepng( $dst_image, $thumbPath );
 219                                                 break;
 220                                         case 2:  # JPEG
 221                                                 #$thumbUrl .= ".jpg";
 222                                                 #$thumbPath .= ".jpg";
 223                                                 imageinterlace( $dst_image );
 224                                                 imagejpeg( $dst_image, $thumbPath, 95 );
 225                                                 break;
 226                                         default:
 227                                                 break;
 228                                 }
 229                                 imagedestroy( $dst_image );
 230                                 imagedestroy( $src_image );
 231
 232
 233                         }
 234                         #
 235                         # Check for zero-sized thumbnails. Those can be generated when
 236                         # no disk space is available or some other error occurs
 237                         #
 238                         $thumbstat = stat( $thumbPath );
 239                         if( $thumbstat["size"] == 0 )
 240                         {
 241                                 unlink( $thumbPath );
 242                         }
 243
 244                         # Purge squid
 245                         # This has to be done after the image is updated and present for all machines on NFS,
 246                         # or else the old version might be stored into the squid again
 247                         if ( $wgUseSquid ) {
 248                                 $urlArr = Array(
 249                                         $wgInternalServer.$thumbUrl
 250                                 );
 251                                 wfPurgeSquidServers($urlArr);
 252                         }
 253                 }
 254                 return $thumbUrl;
 255         } // END OF function createThumb
 256
 257         //**********************************************************************
 258         // Return the image history of this image, line by line.
 259         // starts with current version, then old versions.
 260         // uses $this->historyLine to check which line to return:
 261         //  0      return line for current version
 262         //  1      query for old versions, return first one
 263         //  2, ... return next old version from above query
 264         function nextHistoryLine()
 265         {
 266                 $fname = "Image::nextHistoryLine()";
 267                 $dbr =& wfGetDB( DB_SLAVE );
 268                 if ( $this->historyLine == 0 ) {// called for the first time, return line from cur
 269                         $this->historyRes = $dbr->select( 'image',
 270                                 array( 'img_size','img_description','img_user','img_user_text','img_timestamp', "'' AS oi_archive_name" ),
 271                                 array( 'img_name' => $this->title->getDBkey() ),
 272                                 $fname
 273                         );
 274                         if ( 0 == wfNumRows( $this->historyRes ) ) {
 275                                 return FALSE;
 276                         }
 277                 } else if ( $this->historyLine == 1 ) {
 278                         $this->historyRes = $dbr->select( 'oldimage',
 279                                 array( 'oi_size AS img_size', 'oi_description AS img_description', 'oi_user AS img_user',
 280                                         'oi_user_text AS img_user_text', 'oi_timestamp AS img_timestamp', 'oi_archive_name'
 281                                 ), array( 'oi_name' => $this->title->getDBkey() ), $fname, array( 'ORDER BY' => 'oi_timestamp DESC' )
 282                         );
 283                 }
 284                 $this->historyLine ++;
 285
 286                 return $dbr->fetchObject( $this->historyRes );
 287         }
 288
 289         function resetHistory()
 290         {
 291                 $this->historyLine = 0;
 292         }
 293
 294
 295 } //class
 296