Function HPDF_Page_TextRect 

pub unsafe extern "C" fn HPDF_Page_TextRect(
    page: HPDF_Page,
    left: HPDF_REAL,
    top: HPDF_REAL,
    right: HPDF_REAL,
    bottom: HPDF_REAL,
    text: *const c_char,
    align: HPDF_TextAlignment,
    len: *mut HPDF_UINT,
)