pango:cairo-update-context (cr context)

cr -- a cairo:context-t instance
context -- a pango:context object, from a PangoCairo font map

Updates a Pango context previously created for use with Cairo to match the current transformation and target surface of a Cairo context. If any Pango layouts have been created for the Pango context, it is necessary to call the pango:layout-context-changed function on those layouts.