ev_document_class->get_page_size = tiff_document_get_page_size;
ev_document_class->render = tiff_document_render;
ev_document_class->get_page_label = tiff_document_get_page_label;
ev_document_class->get_page_size = tiff_document_get_page_size;
ev_document_class->render = tiff_document_render;
ev_document_class->get_page_label = tiff_document_get_page_label;