2003-10-09  Michael Natterer  <mitch@gimp.org>

	* app/core/core-types.h: added GimpScanConvert typedef.

	* app/core/gimpscanconvert.h: removed it here.

	* app/core/gimpchannel-select.[ch]: factored out new
	function gimp_channel_select_scan_convert().

	(gimp_channel_select_polygon)
	(gimp_channel_select_vectors): use it.

	(gimp_channel_select_alpha): when called on a layer without alpha,
	don't fail but fake the effect of a fully opaque alpha channel.

	* app/tools/gimpiscissorstool.c: some cleanup.

	(iscissors_convert): fixed my latest cleanup (don't cast the
	tool to a GimpGrawable ;). Don't ignore options->antialias.