Vector implementations Version 0.46 of Inkscape includes a bucket fill tool, giving output similar to ordinary bitmap operations and indeed using one: the canvas is rendered, a flood fill operation is performed on the selected area and the result is then traced back to a path. It uses the concept of a boundary condition.
vectOr implemeNtAtions verSiOn 0.46 Of INKscapE INcLudes A buCkEt fiLl tOol, giving oUTput sIMilAr TO ordinary BiTmap operatiOnS anD iNdeed using onE: THE caNVAs iS rEndered, A floOd Fill opeRatION is performED on the seLEcted ARea and the ReSult is ThEN traCeD Back To a PAth. it USes tHe coNCept of A boUndarY CoNDiTIOn.