includes/media/Tiff.php

   1 <?php
   2 /**
   3  * Handler for Tiff images.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Media
  22  */
  23
  24 /**
  25  * Handler for Tiff images.
  26  *
  27  * @ingroup Media
  28  */
  29 class TiffHandler extends ExifBitmapHandler {
  30
  31         /**
  32          * Conversion to PNG for inline display can be disabled here...
  33          * Note scaling should work with ImageMagick, but may not with GD scaling.
  34          *
  35          * Files pulled from an another MediaWiki instance via ForeignAPIRepo /
  36          * InstantCommons will have thumbnails managed from the remote instance,
  37          * so we can skip this check.
  38          *
  39          * @param $file
  40          *
  41          * @return bool
  42          */
  43         function canRender( $file ) {
  44                 global $wgTiffThumbnailType;
  45                 return (bool)$wgTiffThumbnailType
  46                         || ($file->getRepo() instanceof ForeignAPIRepo);
  47         }
  48
  49         /**
  50          * Browsers don't support TIFF inline generally...
  51          * For inline display, we need to convert to PNG.
  52          *
  53          * @param $file
  54          *
  55          * @return bool
  56          */
  57         function mustRender( $file ) {
  58                 return true;
  59         }
  60
  61         /**
  62          * @param $ext
  63          * @param $mime
  64          * @param $params
  65          * @return bool
  66          */
  67         function getThumbType( $ext, $mime, $params = null ) {
  68                 global $wgTiffThumbnailType;
  69                 return $wgTiffThumbnailType;
  70         }
  71
  72         /**
  73          * @param File $image
  74          * @param string $filename
  75          * @throws MWException
  76          * @return string
  77          */
  78         function getMetadata( $image, $filename ) {
  79                 global $wgShowEXIF;
  80                 if ( $wgShowEXIF ) {
  81                         try {
  82                                 $meta = BitmapMetadataHandler::Tiff( $filename );
  83                                 if ( !is_array( $meta ) ) {
  84                                         // This should never happen, but doesn't hurt to be paranoid.
  85                                         throw new MWException( 'Metadata array is not an array' );
  86                                 }
  87                                 $meta['MEDIAWIKI_EXIF_VERSION'] = Exif::version();
  88                                 return serialize( $meta );
  89                         }
  90                         catch ( MWException $e ) {
  91                                 // BitmapMetadataHandler throws an exception in certain exceptional
  92                                 // cases like if file does not exist.
  93                                 wfDebug( __METHOD__ . ': ' . $e->getMessage() . "\n" );
  94                                 return ExifBitmapHandler::BROKEN_FILE;
  95                         }
  96                 } else {
  97                         return '';
  98                 }
  99         }
 100 }