2003-06-05  Sven Neumann  <sven@gimp.org>

	* app/core/gimpdrawable.c (gimp_drawable_get_color_at):
	* app/core/gimpimage-projection.c (gimp_image_projection_get_color_at):
	use OPAQUE_OPACITY instead of 255.

	* app/core/gimpimage-pick-color.[ch]: factored out code that
	averages over colors so it can be used from GimpImageTool.

	* app/tools/gimpimagemaptool.[ch]: derived from GimpColorTool and
	added a GimpColorTool::pick implementation.

	* app/tools/gimpcoloroptions.c
	* app/tools/gimpcolorpickeroptions.c: add the toggle for
	"sample_merged" in gimp_color_picker_options_gui().

	* app/tools/gimpcolortool.c (gimp_color_tool_cursor_update): check
	if the cursor is over the active drawable or if "sample_merged" is
	active.

	* app/tools/gimplevelstool.c: simplified since all color-picking is
	now handled by the parent classes. Fixes bug #112668.