2001-11-19  Daniel Egger  <degger@fhm.edu>

	* app/paint-funcs/paint-funcs.c
	* app/paint-funcs/paint-funcs-generic.h: Split generic (read: C)
	code for pixelmanipulation and most of the code that belongs to it
	into new file.
	(apply_layer_funcs): Gone. The correct layer function is now
	dispatched from the layer_mode_funcs table and the table is
	per default initialised with the generic functions. Arguments
	will be passed by a struct apply_layer_mode_struct instead
	of directly per stack to avoid parameter typying madness.

	It's now cleanly possible to check for availabilty of
	MMX/AltiVec/(insert your favourite brew here) in
	paint_funcs_setup () and change the table to use faster routines.
	The old MMX cruft which is temporaribly in paint-funcs-generic.h
	will soon be gone but I'm to tired now.

	* app/paint-funcs/paint-funcs.c: Braind dead code for temporary
	buffer (which never shrunk only grew) gone and replaced by
	straightforward code.

	* app/paint-funcs/paint-funcs-generic.h: Applied a bunch of obvious
	optimisations to reduce code size and avoid parameter madness.

	* paint-funcs-[gray|graya|indexed|rga|rgba].[c|h]: Gone. I lost
	several days of work on these files and came to the conclusion
	that there has to be an easier way anyway. :)

	Everything well tested on PPC and producing exactly the same results
	as the code before so this has good odds to be the first major
	change that won't break GIMP. :)