/* Copyright (C) 2001-2023 Artifex Software, Inc.
   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.

   Refer to licensing information at http://www.artifex.com or contact
   Artifex Software, Inc.,  39 Mesa Street, Suite 108A, San Francisco,
   CA 94129, USA, for further information.
*/


/* Definitions for LL3 Functions */

#ifndef gsfunc3_INCLUDED
#  define gsfunc3_INCLUDED

#include "gsfunc.h"
#include "gsdsrc.h"

/* ---------------- Types and structures ---------------- */

/*
 * Define the Function types.
 * See gsfunc.h for why gs_function_type_t can't be an enum type.
 */
enum {
    function_type_ExponentialInterpolation = 2,
    function_type_1InputStitching = 3,
    /* For internal use only */
    function_type_ArrayedOutput = -1
};

/* Define Exponential Interpolation functions. */
typedef struct gs_function_ElIn_params_s {
    gs_function_params_common;
    const float *C0;		/* n, optional */
    const float *C1;		/* n, optional */
    float N;
} gs_function_ElIn_params_t;

#define private_st_function_ElIn()	/* in gsfunc.c */\
  gs_private_st_suffix_add2(st_function_ElIn, gs_function_ElIn_t,\
    "gs_function_ElIn_t", function_ElIn_enum_ptrs, function_ElIn_reloc_ptrs,\
    st_function, params.C0, params.C1)

/* Define 1-Input Stitching functions. */
typedef struct gs_function_1ItSg_params_s {
    gs_function_params_common;
    int k;
    const gs_function_t *const *Functions;	/* k */
    const float *Bounds;	/* k - 1 */
    const float *Encode;	/* 2 x k */
} gs_function_1ItSg_params_t;

#define private_st_function_1ItSg()	/* in gsfunc.c */\
  gs_private_st_suffix_add3(st_function_1ItSg, gs_function_1ItSg_t,\
    "gs_function_1ItSg_t", function_1ItSg_enum_ptrs, function_1ItSg_reloc_ptrs,\
    st_function, params.Functions, params.Bounds, params.Encode)

/*
 * Define Arrayed Output functions.  These consist of n m x 1 functions
 * whose outputs are assembled into the output of the arrayed function.
 * We use them to handle certain PostScript constructs that can accept
 * either a single n-output function or n 1-output functions.
 *
 * Note that for this type, and only this type, both Domain and Range
 * are ignored (0).
 */
typedef struct gs_function_AdOt_params_s {
    gs_function_params_common;
    const gs_function_t *const *Functions;	/* n */
} gs_function_AdOt_params_t;

#define private_st_function_AdOt()	/* in gsfunc.c */\
  gs_private_st_suffix_add1(st_function_AdOt, gs_function_AdOt_t,\
    "gs_function_AdOt_t", function_AdOt_enum_ptrs, function_AdOt_reloc_ptrs,\
    st_function, params.Functions)

/* ---------------- Procedures ---------------- */

/* Allocate and initialize functions of specific types. */
int gs_function_ElIn_init(gs_function_t ** ppfn,
                          const gs_function_ElIn_params_t * params,
                          gs_memory_t * mem);
int gs_function_1ItSg_init(gs_function_t ** ppfn,
                           const gs_function_1ItSg_params_t * params,
                           gs_memory_t * mem);
int gs_function_AdOt_init(gs_function_t ** ppfn,
                          const gs_function_AdOt_params_t * params,
                          gs_memory_t * mem);

/* Free parameters of specific types. */
void gs_function_ElIn_free_params(gs_function_ElIn_params_t * params,
                                  gs_memory_t * mem);
void gs_function_1ItSg_free_params(gs_function_1ItSg_params_t * params,
                                   gs_memory_t * mem);
void gs_function_AdOt_free_params(gs_function_AdOt_params_t * params,
                                  gs_memory_t * mem);

#endif /* gsfunc3_INCLUDED */