/* Copyright (C) 2001-2006 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 that
   license.  Refer to licensing information at http://www.artifex.com/
   or contact Artifex Software, Inc.,  7 Mt. Lassen Drive - Suite A-134,
   San Rafael, CA  94903, U.S.A., +1(415)492-9861, for further information.
*/

/* $Id: zcssepr.c 8250 2007-09-25 13:31:24Z giles $ */
/* 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 "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"
#include "gscsepr.h"
#include "gscdevn.h"
#include "gxcdevn.h"
#include "zht2.h"

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

/*
 * Adobe first created the separation colorspace type and then later created
 * the DeviceN colorspace.  Logically the separation colorspace is the same
 * as a DeviceN colorspace with a single component, except for the /None and
 * /All parameter values.  We treat the separation colorspace as a DeviceN
 * colorspace except for the /All case.
 */

/* <array> .setseparationspace - */
/* The current color space is the alternate space for the separation space. */
static int
zsetseparationspace(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    const ref *pcsa;
    gs_color_space *pcs;
    gs_color_space * pacs;
    ref_colorspace cspace_old;
    ref sname, name_none, name_all;
    gs_function_t *pfn = NULL;
    separation_type sep_type;
    int code;
    const gs_memory_t * mem = imemory;

    /* Verify that we have an array as our input parameter */
    check_read_type(*op, t_array);
    if (r_size(op) != 4)
	return_error(e_rangecheck);

    /* The alternate color space has been selected as the current color space */
    pacs = gs_currentcolorspace(igs);
    if (!pacs->type->can_be_alt_space)
	return_error(e_rangecheck);

    /*
     * pcsa is a pointer to element 1 (2nd element)  in the Separation colorspace
     * description array.  Thus pcsa[2] is element #3 (4th element) which is the
     * tint transform.
     */
    pcsa = op->value.const_refs + 1;
    sname = *pcsa;
    switch (r_type(&sname)) {
	default:
	    return_error(e_typecheck);
	case t_string:
	    code = name_from_string(mem, &sname, &sname);
	    if (code < 0)
		return code;
	    /* falls through */
	case t_name:
	    break;
    }

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

    /* Check tint transform procedure. */
    /* See comment above about psca */
    check_proc(pcsa[2]);
    pfn = ref_function(pcsa + 2);
    if (pfn == NULL)
	return_error(e_rangecheck);

    cspace_old = istate->colorspace;
    /* Now set the current color space as Separation */
    code = gs_cspace_new_Separation(&pcs, pacs, imemory);
    if (code < 0)
	return code;
    pcs->params.separation.sep_type = sep_type;
    pcs->params.separation.sep_name = name_index(mem, &sname);
    pcs->params.separation.get_colorname_string = gs_get_colorname_string;
    istate->colorspace.procs.special.separation.layer_name = pcsa[0];
    istate->colorspace.procs.special.separation.tint_transform = pcsa[2];
    if (code >= 0)
        code = gs_cspace_set_sepr_function(pcs, pfn);
    if (code >= 0)
	code = gs_setcolorspace(igs, pcs);
    /* release reference from construction */
    rc_decrement_only(pcs, "zsetseparationspace");
    if (code < 0) {
	istate->colorspace = cspace_old;
	return code;
    }
    pop(1);
    return 0;
}

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

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

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

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

/* <int> .setoverprintmode - */
static 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},
    op_def_end(0)
};