2007-04-27  Sven Neumann  <sven@gimp.org>

	* app/core/gimppickable.[ch]: added get_pixel_at() method to the
	GimpPickable interface. This gives direct access to the pixel
	without converting it to an RGB color.

	* app/core/gimpdrawable.c
	* app/core/gimpimagemap.c
	* app/core/gimpprojection.c: implement the new method and also use
	it to reimplement get_color_at().

	* app/core/gimpimage-crop.c (gimp_image_crop_guess_bgcolor): use
	gimp_pickable_get_pixel_at(). Fixes auto-shrink on indexed and
	grayscale images.

svn path=/trunk/; revision=22359