iface->get_n_pages = dvi_document_get_n_pages;
iface->get_page_size = dvi_document_get_page_size;
iface->render = dvi_document_render;
iface->get_n_pages = dvi_document_get_n_pages;
iface->get_page_size = dvi_document_get_page_size;
iface->render = dvi_document_render;