2003-07-14  Michael Natterer  <mitch@gimp.org>

	* app/paint/gimperaseroptions.[ch]: removed "gboolean hard"
	member/property...

	* app/paint/gimppaintoptions.[ch]: ...and added it here. Added
	gimp_paint_options_get_brush_mode() utility function.

	* app/paint/gimpairbrush.c
	* app/paint/gimpclone.c
	* app/paint/gimpconvolve.c
	* app/paint/gimpdodgeburn.c
	* app/paint/gimperaser.c
	* app/paint/gimppaintbrush.c
	* app/paint/gimppaintcore.h
	* app/paint/gimppencil.c
	* app/paint/gimpsmudge.c: use the new utility funtion where
	appropriate. Removed trailing whitespace.

	* app/tools/gimpdrawtool.[ch] (gimp_paint_tool_draw_boundary):
	changed offset parameters from gint to gdouble so we can show the
	brush preview at sub-pixel positions.

	* app/tools/gimppainttool.c: use sub-pixel coordinates for the
	brush preview if paint_options->hard is FALSE (doesn't work for
	the pencil yet).

	The new brush preview unveiled that the positioning of even-sized
	brushes if off by 0.5 for soft brush application mode and off by
	1.0 for hard application mode:

	* app/paint/gimppaintcore.[ch] (gimp_paint_core_subsample_mask):
	offset painting by 0.5 pixels on the brushes' even sized axes by
	shuffling the subsample matrices around.

	Added "subsampling" for HARD brush application mode since a pixel
	of an even sized brush can snap to up to four different image
	pixels depending on the sub-pixel coordinates of the stroke.