/* The GIMP -- an image manipulation program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * gimplut.h: Copyright (C) 1999 Jay Cox <jaycox@earthlink.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#ifndef __GIMP_LUT_H__
#define __GIMP_LUT_H__

#include "gimplutF.h"
#include "pixel_region.h"

/* TODO: the GimpLutFunc should really be passed the ColorModel of the region,
   not just the number of channels */
/* GimpLutFuncs should assume that the input and output gamma are 1.0
   and do no correction as this will be handled by gimp_lut_setup */ 
typedef float (*GimpLutFunc)(void *user_data, int nchannels,
			     int channel, float value);

GimpLut * gimp_lut_new         ();
void      gimp_lut_free        (GimpLut *lut);

void      gimp_lut_setup       (GimpLut *, GimpLutFunc,
				void *user_data,
				int nchannels);

/* gimp_lut_setup_exact is currently identical to gimp_lut_setup.  It
   however is guaranteed to never perform any interpolation or gamma
   correction on the lut */
void      gimp_lut_setup_exact (GimpLut *, GimpLutFunc,
				void *user_data,
				int nchannels);

void      gimp_lut_process     (GimpLut *lut,
				PixelRegion *srcPR,
				PixelRegion *destPR);

/* gimp_lut_process_inline is like gimp_lut_process except it uses a
   single PixelRegion as both the source and destination */
void      gimp_lut_process_inline(GimpLut *lut,
				  PixelRegion *src_destPR);

/* gimp_lut_process_2 is the same as gimp_lut_process but the lut
   perameter is last instead of first.  this is necesary because
   pixel_region_process_paralell sends the user_data as the 1st
   parameter, and the image_map functions send user_data as the last
   parameter */
void      gimp_lut_process_2  (PixelRegion *srcPR,
			       PixelRegion *destPR,
			       GimpLut *lut);

#endif /* __GIMP_LUT_H__ */