Returns whether an XObject or annotation with the given dictionary is visible here: the current nesting is visible and its
OC entry, if any, says so. An annotation's flags are the caller's concern.
public bool IsObjectVisible(CosDictionary dictionary)
A form or image XObject's stream dictionary, or an annotation dictionary.
true when it shall be drawn.ISO 32000-2 §8.11.3.3 (Tables 87, 93 and 166, OC, PDF 1.5).