Tiff.php

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<?php
class TiffHandler extends ExifBitmapHandler {
    const EXPENSIVE_SIZE_LIMIT = 10485760; // TIFF files over 10M are considered expensive to thumbnail

    public function canRender( $file ) {
        global $wgTiffThumbnailType;

        return (bool)$wgTiffThumbnailType
            || $file->getRepo() instanceof ForeignAPIRepo;
    }

    public function mustRender( $file ) {
        return true;
    }

    function getThumbType( $ext, $mime, $params = null ) {
        global $wgTiffThumbnailType;

        return $wgTiffThumbnailType;
    }

    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 ( Exception $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;
    }
}