Wraps FPDF_CloseXObject. Idempotent. Closing the XObject does
NOT invalidate page-objects created from it via
pdf_obj_form_from_xobject() — those are owned by their parent
page and survive the XObject's release. pdf_doc_close() on the
destination document closes its XObjects as well.
Arguments
- xobject
A
pdfium_xobjectfrompdf_xobject_from_page().