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<?php
/**
* Handler for Tiff images.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup Media
*/
/**
* Handler for Tiff images.
*
* @ingroup Media
*/
class TiffHandler extends ExifBitmapHandler {
const EXPENSIVE_SIZE_LIMIT = 10485760; // TIFF files over 10M are considered expensive to thumbnail
/**
* Conversion to PNG for inline display can be disabled here...
* Note scaling should work with ImageMagick, but may not with GD scaling.
*
* Files pulled from an another MediaWiki instance via ForeignAPIRepo /
* InstantCommons will have thumbnails managed from the remote instance,
* so we can skip this check.
*
* @param File $file
* @return bool
*/
function canRender( $file ) {
global $wgTiffThumbnailType;
return (bool)$wgTiffThumbnailType
|| $file->getRepo() instanceof ForeignAPIRepo;
}
/**
* Browsers don't support TIFF inline generally...
* For inline display, we need to convert to PNG.
*
* @param File $file
* @return bool
*/
function mustRender( $file ) {
return true;
}
/**
* @param string $ext
* @param string $mime
* @param array $params
* @return bool
*/
function getThumbType( $ext, $mime, $params = null ) {
global $wgTiffThumbnailType;
return $wgTiffThumbnailType;
}
/**
* @param File $image
* @param string $filename
* @throws MWException
* @return string
*/
function getMetadata( $image, $filename ) {
global $wgShowEXIF;
if ( $wgShowEXIF ) {
try {
$meta = BitmapMetadataHandler::Tiff( $filename );
if ( !is_array( $meta ) ) {
// This should never happen, but doesn't hurt to be paranoid.
throw new MWException( 'Metadata array is not an array' );
}
$meta['MEDIAWIKI_EXIF_VERSION'] = Exif::version();
return serialize( $meta );
} catch ( MWException $e ) {
// BitmapMetadataHandler throws an exception in certain exceptional
// cases like if file does not exist.
wfDebug( __METHOD__ . ': ' . $e->getMessage() . "\n" );
return ExifBitmapHandler::BROKEN_FILE;
}
} else {
return '';
}
}
public function isExpensiveToThumbnail( $file ) {
return $file->getSize() > static::EXPENSIVE_SIZE_LIMIT;
}
}
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