Function mupdf_sys::fz_pdfocr_writer_set_progress

pub unsafe extern "C" fn fz_pdfocr_writer_set_progress(
    ctx: *mut fz_context, 
    writer: *mut fz_document_writer, 
    progress: Option<unsafe extern "C" fn(arg1: *mut fz_context, arg2: *mut c_void, arg3: c_int) -> c_int>, 
    arg1: *mut c_void
)