Function libeyelink_sys::eyelink_gaze_to_href

pub unsafe extern "C" fn eyelink_gaze_to_href(
    xp: *mut f32, 
    yp: *mut f32, 
    sample: *mut FSAMPLE
) -> INT32

@ingroup extra_data Apply gaze->href to point (xp, yp). This function requires HREFPT data in FSAMPLE. The function \c eyelink_initialize_mapping() should be called before calling this function. @param xp X point to apply gaze->href. @param yp Y point to apply gaze->href. @param sample Sample. @return \c 0 if OK, \c -1 if there is a math error, \c -2 if the tracker does not support this operation.