/* Copyright (C) 2000 Aladdin Enterprises.  All rights reserved.
  
  This software is provided AS-IS with no warranty, either express or
  implied.
  
  This software is distributed under license and may not be copied,
  modified or distributed except as expressly authorized under the terms
  of the license contained in the file LICENSE in this distribution.
  
  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: gsfuncv.c,v 1.3 2002/04/23 11:58:44 easysw Exp $ */
/* "Vanilla" Function support */
#include "gx.h"
#include "gserrors.h"
#include "gsfuncv.h"
#include "gsparam.h"
#include "gxfunc.h"

/* GC descriptor */
private_st_function_Va();

/*
 * Test whether a Vanilla function is monotonic.  (This information is
 * provided at function definition time.)
 */
private int
fn_Va_is_monotonic(const gs_function_t * pfn_common,
		   const float *lower, const float *upper,
		   gs_function_effort_t effort)
{
    const gs_function_Va_t *const pfn =
	(const gs_function_Va_t *)pfn_common;

    return pfn->params.is_monotonic;
}

/* Free the parameters of a Vanilla function. */
void
gs_function_Va_free_params(gs_function_Va_params_t * params,
			   gs_memory_t * mem)
{
    gs_free_object(mem, params->eval_data, "eval_data");
    fn_common_free_params((gs_function_params_t *) params, mem);
}

/* Allocate and initialize a Vanilla function. */
int
gs_function_Va_init(gs_function_t ** ppfn,
		    const gs_function_Va_params_t * params,
		    gs_memory_t * mem)
{
    static const gs_function_head_t function_Va_head = {
	function_type_Vanilla,
	{
	    NULL,			/* filled in from params */
	    (fn_is_monotonic_proc_t) fn_Va_is_monotonic,
	    gs_function_get_info_default,
	    fn_common_get_params,	/****** WHAT TO DO ABOUT THIS? ******/
	    (fn_free_params_proc_t) gs_function_Va_free_params,
	    fn_common_free
	}
    };
    int code;

    *ppfn = 0;			/* in case of error */
    code = fn_check_mnDR((const gs_function_params_t *)params, 1, params->n);
    if (code < 0)
	return code;
    {
	gs_function_Va_t *pfn =
	    gs_alloc_struct(mem, gs_function_Va_t, &st_function_Va,
			    "gs_function_Va_init");

	if (pfn == 0)
	    return_error(gs_error_VMerror);
	pfn->params = *params;
	pfn->head = function_Va_head;
	pfn->head.procs.evaluate = params->eval_proc;
	pfn->head.is_monotonic = params->is_monotonic;
	*ppfn = (gs_function_t *) pfn;
    }
    return 0;
}
