/* Copyright (C) 1994, 2000 Aladdin Enterprises.  All rights reserved.
  
  This file is part of AFPL Ghostscript.
  
  AFPL Ghostscript is distributed with NO WARRANTY OF ANY KIND.  No author or
  distributor accepts any responsibility for the consequences of using it, or
  for whether it serves any particular purpose or works at all, unless he or
  she says so in writing.  Refer to the Aladdin Free Public License (the
  "License") for full details.
  
  Every copy of AFPL Ghostscript must include a copy of the License, normally
  in a plain ASCII text file named PUBLIC.  The License grants you the right
  to copy, modify and redistribute AFPL Ghostscript, but only under certain
  conditions described in the License.  Among other things, the License
  requires that the copyright notice and this notice be preserved on all
  copies.
*/

/*$Id: zcssepr.c,v 1.8 2001/04/20 09:38:39 igorm Exp $ */
/* Separation color space support */
#include "memory_.h"
#include "ghost.h"
#include "oper.h"
#include "gsstruct.h"
#include "gscolor.h"
#include "gsmatrix.h"		/* for gxcolor2.h */
#include "gscsepr.h"
#include "gxcspace.h"
#include "gxfixed.h"		/* ditto */
#include "gxcolor2.h"
#include "estack.h"
#include "ialloc.h"
#include "icsmap.h"
#include "ifunc.h"
#include "igstate.h"
#include "iname.h"
#include "ivmspace.h"
#include "store.h"

/* Imported from gscsepr.c */
extern const gs_color_space_type gs_color_space_type_Separation;

/* Forward references */
private int separation_map1(P1(i_ctx_t *));

/* Define the separation cache size.  This makes many useful tint values */
/* map to integer cache indices. */
#define SEPARATION_CACHE_SIZE 360

/* Tint transform procedure that just consults the cache. */
private int
lookup_tint(const gs_separation_params * params, floatp tint, float *values)
{
    int m = cs_num_components((const gs_color_space *)&params->alt_space);
    const gs_indexed_map *map = params->map;
    int value_index =
	(tint < 0 ? 0 : tint > 1 ? map->num_values - m :
	 (int)(tint * SEPARATION_CACHE_SIZE + 0.5) * m);
    const float *pv = &map->values[value_index];

    memcpy(values, pv, sizeof(*values) * m);
    return 0;
}

/* <array> .setseparationspace - */
/* The current color space is the alternate space for the separation space. */
private int
zsetseparationspace(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    const ref *pcsa;
    gs_color_space cs;
    ref_colorspace cspace_old;
    uint edepth = ref_stack_count(&e_stack);
    gs_indexed_map *map = 0;
    ref sname, tname1, tname2;
    separation_type sep_type;
    int code;

    check_read_type(*op, t_array);
    if (r_size(op) != 4)
	return_error(e_rangecheck);
    pcsa = op->value.const_refs + 1;
    sname = *pcsa;
    switch (r_type(&sname)) {
	default:
	    return_error(e_typecheck);
	case t_string:
	    code = name_from_string(&sname, &sname);
	    if (code < 0)
		return code;
	    /* falls through */
	case t_name:
	    break;
    }

    if ((code = name_ref((const byte *)"All", 3, &tname1, 0)) < 0)
	return code;
    if ((code = name_ref((const byte *)"None", 4, &tname2, 0)) < 0)
	return code;
    sep_type = ( name_eq(&sname, &tname1) ? SEP_ALL :
	         name_eq(&sname, &tname2) ? SEP_NONE : SEP_OTHER);

    check_proc(pcsa[2]);
    cs = *gs_currentcolorspace(igs);
    if (!cs.type->can_be_alt_space)
	return_error(e_rangecheck);
    if (sep_type == SEP_OTHER) {
	code = zcs_begin_map(i_ctx_p, &map, &pcsa[2], SEPARATION_CACHE_SIZE + 1,
			     (const gs_direct_color_space *)&cs,
			     separation_map1);
	if (code < 0)
	    return code;
        map->proc.tint_transform = lookup_tint;
    }

    /* See zcsindex.c for why we use memmove here. */
    memmove(&cs.params.separation.alt_space, &cs,
	    sizeof(cs.params.separation.alt_space));
    gs_cspace_init(&cs, &gs_color_space_type_Separation, NULL);
    cs.params.separation.sname = name_index(&sname);
    cs.params.separation.map = map;
    cs.params.separation.sep_type = sep_type;
    cspace_old = istate->colorspace;
    istate->colorspace.procs.special.separation.layer_name = pcsa[0];
    istate->colorspace.procs.special.separation.tint_transform = pcsa[2];
    code = gs_setcolorspace(igs, &cs);
    if (code < 0) {
	istate->colorspace = cspace_old;
	ref_stack_pop_to(&e_stack, edepth);
	return code;
    }
    pop(1);
    return (ref_stack_count(&e_stack) == edepth ? 0 : o_push_estack);	/* installation will load the caches */
}

/* Continuation procedure for saving transformed tint values. */
private int
separation_map1(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    es_ptr ep = esp;
    int i = (int)ep[csme_index].value.intval;

    if (i >= 0) {		/* i.e., not first time */
	int m = (int)ep[csme_num_components].value.intval;
	int code = float_params(op, m, &r_ptr(&ep[csme_map], gs_indexed_map)->values[i * m]);

	if (code < 0)
	    return code;
	pop(m);
	op -= m;
	if (i == (int)ep[csme_hival].value.intval) {	/* All done. */
	    /*
	     * If the tint_transform procedure is a Function, recognize it
	     * as such now.
	     */
	    gs_function_t *pfn = ref_function(&ep[csme_proc]);

	    if (pfn)
		gs_cspace_set_sepr_function(gs_currentcolorspace(igs), pfn);
	    esp -= num_csme;
	    return o_pop_estack;
	}
    }
    push(1);
    ep[csme_index].value.intval = ++i;
    make_real(op, i / (float)SEPARATION_CACHE_SIZE);
    make_op_estack(ep + 1, separation_map1);
    ep[2] = ep[csme_proc];	/* tint_transform */
    esp = ep + 2;
    return o_push_estack;
}

/* - currentoverprint <bool> */
private int
zcurrentoverprint(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;

    push(1);
    make_bool(op, gs_currentoverprint(igs));
    return 0;
}

/* <bool> setoverprint - */
private int
zsetoverprint(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;

    check_type(*op, t_boolean);
    gs_setoverprint(igs, op->value.boolval);
    pop(1);
    return 0;
}

/* - .currentoverprintmode <int> */
private int
zcurrentoverprintmode(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;

    push(1);
    make_int(op, gs_currentoverprintmode(igs));
    return 0;
}

/* <int> .setoverprintmode - */
private int
zsetoverprintmode(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    int param;
    int code = int_param(op, max_int, &param);

    if (code < 0 || (code = gs_setoverprintmode(igs, param)) < 0)
	return code;
    pop(1);
    return 0;
}

/* ------ Initialization procedure ------ */

const op_def zcssepr_l2_op_defs[] =
{
    op_def_begin_level2(),
    {"0currentoverprint", zcurrentoverprint},
    {"0.currentoverprintmode", zcurrentoverprintmode},
    {"1setoverprint", zsetoverprint},
    {"1.setoverprintmode", zsetoverprintmode},
    {"1.setseparationspace", zsetseparationspace},
		/* Internal operators */
    {"1%separation_map1", separation_map1},
    op_def_end(0)
};
