/* Copyright (C) 1994, 1996, 1999 Aladdin Enterprises.  All rights reserved.
  
  This program is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License version 2
  as published by the Free Software Foundation.


  This software is provided AS-IS with no warranty, either express or
  implied. That is, 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.
  
  For more information about licensing, please refer to
  http://www.ghostscript.com/licensing/. For information on
  commercial licensing, go to http://www.artifex.com/licensing/ or
  contact Artifex Software, Inc., 101 Lucas Valley Road #110,
  San Rafael, CA  94903, U.S.A., +1(415)492-9861.
*/

/* $Id: icolor.h,v 1.5 2002/06/16 04:47:10 lpd Exp $ */
/* Declarations for transfer function & similar cache remapping */

#ifndef icolor_INCLUDED
#  define icolor_INCLUDED

/*
 * Define the number of stack slots needed for zcolor_remap_one.
 * The client is responsible for doing check_e/ostack or the equivalent
 * before calling zcolor_remap_one.
 */
extern const int zcolor_remap_one_ostack;
extern const int zcolor_remap_one_estack;

/*
 * Schedule the sampling and reloading of a cache.  Note that if
 * zcolor_remap_one recognize the procedure as being of a special form, it
 * may not schedule anything, but it still returns o_push_estack.  (This is
 * a change as of release 5.95; formerly, it returned 0 in this case.)
 */
int zcolor_remap_one(i_ctx_t *, const ref *, gx_transfer_map *,
		     const gs_state *, op_proc_t);

/* Reload a cache with entries in [0..1] after sampling. */
int zcolor_remap_one_finish(i_ctx_t *);

/* Reload a cache with entries in [-1..1] after sampling. */
int zcolor_remap_one_signed_finish(i_ctx_t *);

/* Recompute the effective transfer functions and invalidate the current */
/* color after cache reloading. */
int zcolor_reset_transfer(i_ctx_t *);

/* Invalidate the current color after cache reloading. */
int zcolor_remap_color(i_ctx_t *);

#endif /* icolor_INCLUDED */
