gtk:printer-hard-margins-for-paper-size (printer size)

printer -- a gtk:printer object
size -- a gtk:paper-size instance
top -- a double float for the top margin
bottom -- a double float for the bottom margin
left -- a double float for the left margin
right -- a double float for the right margin

Retrieve the hard margins of printer for size. The hard margins define the area at the borders of the paper that the printer cannot print to. This will not succeed unless the details of the printer are available, see the gtk:printer-has-details and gtk:printer-request-details function.