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                 $width,         # \
  15                 $height,        #  --- returned by getimagesize, see http://de3.php.net/manual/en/function.getimagesize.php
  16                 $type,          #  |
  17                 $attr;          # /
  18
  19
  20         function Image( $name )
  21         {
  22                 $this->name      = $name;
  23                 $this->title     = Title::makeTitle( Namespace::getImage(), $this->name );
  24                 $this->imagePath = wfImagePath( $name );
  25                 $this->url       = $this->wfImageUrl( $name );
  26
  27                 if ( $this->fileExists = file_exists( $this->imagePath ) ) // Sic!, "=" is intended
  28                 {
  29                         list($this->width, $this->height, $this->type, $this->attr) = getimagesize( $this->imagePath );
  30                 }
  31         }
  32
  33         function newFromTitle( $nt )
  34         {
  35                 $img = new Image( $nt->getDBKey() );
  36                 $img->title = $nt;
  37                 return $img;
  38         }
  39
  40         function getName()
  41         {
  42                 return $this->name;
  43         }
  44
  45         function getURL()
  46         {
  47                 return $this->url;
  48         }
  49
  50         function getImagePath()
  51         {
  52                 return $this->imagePath;
  53         }
  54
  55         function getWidth()
  56         {
  57                 return $this->width;
  58         }
  59
  60         function getHeight()
  61         {
  62                 return $this->height;
  63         }
  64
  65         function getType()
  66         {
  67                 return $this->type;
  68         }
  69
  70         function getEscapeLocalURL()
  71         {
  72                 return $this->title->escapeLocalURL();
  73         }
  74
  75         function wfImageUrl( $name )
  76         {
  77                 global $wgUploadPath;
  78                 $hash = md5( $name );
  79
  80                 $url = "{$wgUploadPath}/" . $hash{0} . "/" .
  81                 substr( $hash, 0, 2 ) . "/{$name}";
  82                 return wfUrlencode( $url );
  83         }
  84
  85
  86         function exists()
  87         {
  88                 return $this->fileExists;
  89         }
  90
  91
  92         function createThumb( $width ) {
  93                 global $wgUploadDirectory;
  94                 global $wgImageMagickConvertCommand;
  95                 global $wgUseImageMagick;
  96                 global $wgUseSquid, $wgInternalServer;
  97                 $thumbName = $width."px-".$this->name;
  98                 $thumbPath = wfImageThumbDir( $thumbName )."/".$thumbName;
  99                 $thumbUrl  = wfImageThumbUrl( $thumbName );
 100
 101                 if ( ! $this->exists() )
 102                 {
 103                         # If there is no image, there will be no thumbnail
 104                         return "";
 105                 }
 106
 107                 # Sanity check $width
 108                 $width = IntVal( $width );
 109                 if( $width <= 0 ) {
 110                         # BZZZT
 111                         return "";
 112                 }
 113                 if( $width > $this->width ) {
 114                         # Don't make an image bigger than the source
 115                         return $this->getURL();
 116                 }
 117
 118                 if (    (! file_exists( $thumbPath ) )
 119                      || ( filemtime($thumbPath) < filemtime($this->imagePath) ) ) {
 120                         # Squid purging
 121                         if ( $wgUseSquid ) {
 122                                 $urlArr = Array(
 123                                         $wgInternalServer.$thumbUrl
 124                                 );
 125                                 wfPurgeSquidServers($urlArr);
 126                         }
 127
 128                         if ( $wgUseImageMagick ) {
 129                                 # use ImageMagick
 130                                 $cmd  =  $wgImageMagickConvertCommand .
 131                                         " -quality 85 -geometry {$width} ".
 132                                         escapeshellarg($this->imagePath) . " " .
 133                                         escapeshellarg($thumbPath);
 134                                 $conv = shell_exec( $cmd );
 135                         } else {
 136                                 # Use PHP's builtin GD library functions.
 137                                 #
 138                                 # First find out what kind of file this is, and select the correct
 139                                 # input routine for this.
 140
 141                                 switch( $this->type ) {
 142                                         case 1: # GIF
 143                                                 $src_image = imagecreatefromgif( $this->imagePath );
 144                                                 break;
 145                                         case 2: # JPG
 146                                                 $src_image = imagecreatefromjpeg( $this->imagePath );
 147                                                 break;
 148                                         case 3: # PNG
 149                                                 $src_image = imagecreatefrompng( $this->imagePath );
 150                                                 break;
 151                                         case 15: # WBMP for WML
 152                                                 $src_image = imagecreatefromwbmp( $this->imagePath );
 153                                                 break;
 154                                         case 16: # XBM
 155                                                 $src_image = imagecreatefromxbm( $this->imagePath );
 156                                                 break;
 157                                         default:
 158                                                 return "Image type not supported";
 159                                                 break;
 160                                 }
 161                                 $height = floor( $this->height * ( $width/$this->width ) );
 162                                 $dst_image = imagecreatetruecolor( $width, $height );
 163                                 imagecopyresampled( $dst_image, $src_image,
 164                                                         0,0,0,0,
 165                                                         $width, $height, $this->width, $this->height );
 166                                 switch( $this->type ) {
 167                                         case 1:  # GIF
 168                                         case 3:  # PNG
 169                                         case 15: # WBMP
 170                                         case 16: # XBM
 171                                                 #$thumbUrl .= ".png";
 172                                                 #$thumbPath .= ".png";
 173                                                 imagepng( $dst_image, $thumbPath );
 174                                                 break;
 175                                         case 2:  # JPEG
 176                                                 #$thumbUrl .= ".jpg";
 177                                                 #$thumbPath .= ".jpg";
 178                                                 imageinterlace( $dst_image );
 179                                                 imagejpeg( $dst_image, $thumbPath, 95 );
 180                                                 break;
 181                                         default:
 182                                                 break;
 183                                 }
 184                                 imagedestroy( $dst_image );
 185                                 imagedestroy( $src_image );
 186
 187
 188                         }
 189                         #
 190                         # Check for zero-sized thumbnails. Those can be generated when
 191                         # no disk space is available or some other error occurs
 192                         #
 193                         $thumbstat = stat( $thumbPath );
 194                         if( $thumbstat["size"] == 0 )
 195                         {
 196                                 unlink( $thumbPath );
 197                         }
 198
 199                 }
 200                 return $thumbUrl;
 201         } //function createThumb
 202
 203 } //class