2003-09-30  Simon Budig  <simon@gimp.org>

	* app/vectors/gimpbezierstroke.c:
	(gimp_bezier_stroke_interpolate) Accept NULL for ret_closed.

	* app/widgets/gimppreviewrenderervectors.c: removed "closed"
	variable.

	* app/core/gimpdrawable-stroke.[ch]: Factored out the final
	rendering of the scanconvert. Implemented
	gimp_drawable_stroke_boundary. Unfortunately the results are
	not really good, since the boundary calculation code is
	too exact for this purpose. I have a rough idea how to fix this.

	* app/core/gimpchannel.c: changed accordingly.