MockDjVuHandler.php

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<?php
class MockDjVuHandler extends DjVuHandler {
    public function isEnabled() {
        return true;
    }
 
    function doTransform( $image, $dstPath, $dstUrl, $params, $flags = 0 ) {
        if ( !$this->normaliseParams( $image, $params ) ) {
            return new TransformParameterError( $params );
        }
        $width = $params['width'];
        $height = $params['height'];
        $page = $params['page'];
        if ( $page > $this->pageCount( $image ) ) {
            return new MediaTransformError(
                'thumbnail_error',
                $width,
                $height,
                wfMessage( 'djvu_page_error' )->text()
            );
        }
 
        $params = [
            'width' => $width,
            'height' => $height,
            'page' => $page
        ];
 
        return new ThumbnailImage( $image, $dstUrl, $dstPath, $params );
    }
}