pub unsafe extern "C" fn pdf_preview_signature_as_pixmap( ctx: *mut fz_context, w: c_int, h: c_int, lang: fz_text_language, signer: *mut pdf_pkcs7_signer, appearance_flags: c_int, graphic: *mut fz_image, reason: *const c_char, location: *const c_char) -> *mut fz_pixmap