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  Everyone is granted permission to copy, modify and redistribute GNU
  Ghostscript, but only under the conditions described in the GNU General
  Public License.  A copy of this license is supposed to have been given to
  you along with GNU Ghostscript so you can know your rights and
  responsibilities.  It should be in a file named COPYING.  Among other
  things, the copyright notice and this notice must be preserved on all
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  Aladdin Enterprises is not affiliated with the Free Software Foundation or
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*/

/*$Id: zcolor2.c,v 1.3 1999/04/01 05:31:57 fedor Exp $ */
/* Level 2 color operators */
#include "ghost.h"
#include "oper.h"
#include "gscolor.h"
#include "gsmatrix.h"
#include "gsstruct.h"
#include "gxcspace.h"
#include "gxfixed.h"		/* for gxcolor2.h */
#include "gxcolor2.h"
#include "gxdcolor.h"		/* for gxpcolor.h */
#include "gxdevice.h"
#include "gxdevmem.h"		/* for gxpcolor.h */
#include "gxpcolor.h"
#include "estack.h"
#include "ialloc.h"
#include "istruct.h"
#include "idict.h"
#include "idparam.h"
#include "igstate.h"
#include "store.h"

/* Declare a local alias for st_pattern_instance. */
/* We do this so we can have configurations with */
/* the base Level 2 color machinery but without patterns. */
gs_memory_type_ptr_t zcolor2_st_pattern_instance_p = 0;

/* Forward references */
private int store_color_params(P3(os_ptr, const gs_paint_color *,
				  const gs_color_space *));
private int load_color_params(P3(os_ptr, gs_paint_color *,
				 const gs_color_space *));

/* - currentcolor <param1> ... <paramN> */
private int
zcurrentcolor(register os_ptr op)
{
    const gs_client_color *pc = gs_currentcolor(igs);
    const gs_color_space *pcs = gs_currentcolorspace(igs);
    int n;

    check_ostack(5);		/* Worst case: CMYK + pattern */
    if (pcs->type->index == gs_color_space_index_Pattern) {
	n = 1;
	if (pc->pattern != 0 && pc->pattern->template.PaintType == 2)	/* uncolored */
	    n += store_color_params(op, &pc->paint,
		   (const gs_color_space *)&pcs->params.pattern.base_space);
	op[n] = istate->pattern;
    } else
	n = store_color_params(op, &pc->paint, pcs);
    push(n);
    return 0;
}

/* - .currentcolorspace <array|int> */
private int
zcurrentcolorspace(register os_ptr op)
{
    push(1);
    if (r_has_type(&istate->colorspace.array, t_null)) {
	/*
	 * Return the color space index.  This is only possible
	 * for the parameterless color spaces.
	 */
	make_int(op, (int)(gs_currentcolorspace(igs)->type->index));
    } else
	*op = istate->colorspace.array;
    return 0;
}

/* <param1> ... <paramN> setcolor - */
private int
zsetcolor(register os_ptr op)
{
    gs_client_color c;
    const gs_color_space *pcs = gs_currentcolorspace(igs);
    int n, code;
    gs_pattern_instance *pinst = 0;

    if (pcs->type->index == gs_color_space_index_Pattern) {
	/* Make sure *op is a real Pattern. */
	ref *pImpl;

	check_type(*op, t_dictionary);
	check_dict_read(*op);
	if (dict_find_string(op, "Implementation", &pImpl) <= 0 ||
	    !r_has_stype(pImpl, imemory, *zcolor2_st_pattern_instance_p)
	    )
	    return_error(e_rangecheck);
	pinst = r_ptr(pImpl, gs_pattern_instance);
	c.pattern = pinst;
	if (pinst->template.PaintType == 2) {	/* uncolored */
	    if (!pcs->params.pattern.has_base_space)
		return_error(e_rangecheck);
	    n = load_color_params(op - 1, &c.paint,
		   (const gs_color_space *)&pcs->params.pattern.base_space);
	    if (n < 0)
		return n;
	    n++;
	} else
	    n = 1;
    } else {
	n = load_color_params(op, &c.paint, pcs);
	c.pattern = 0;		/* for GC */
    }
    if (n < 0)
	return n;
    code = gs_setcolor(igs, &c);
    if (code < 0)
	return code;
    if (pinst != 0)
	istate->pattern = *op;
    pop(n);
    return code;
}

/* <array> .setcolorspace - */
private int
zsetcolorspace(register os_ptr op)
{
    check_type(*op, t_array);
    istate->colorspace.array = *op;
    pop(1);
    return 0;
}

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

const op_def zcolor2_l2_op_defs[] =
{
    op_def_begin_level2(),
    {"0currentcolor", zcurrentcolor},
    {"0.currentcolorspace", zcurrentcolorspace},
    {"1setcolor", zsetcolor},
    {"1.setcolorspace", zsetcolorspace},
    op_def_end(0)
};

/* ------ Internal procedures ------ */

/* Store non-pattern color values on the operand stack. */
/* Return the number of values stored. */
private int
store_color_params(os_ptr op, const gs_paint_color * pc,
		   const gs_color_space * pcs)
{
    int n = cs_num_components(pcs);

    if (pcs->type->index == gs_color_space_index_Indexed)
	make_int(op + 1, (int)pc->values[0]);
    else
	make_floats(op + 1, pc->values, n);
    return n;
}

/* Load non-pattern color values from the operand stack. */
/* Return the number of values stored. */
private int
load_color_params(os_ptr op, gs_paint_color * pc, const gs_color_space * pcs)
{
    int n = cs_num_components(pcs);
    int code = float_params(op, n, pc->values);

    if (code < 0)
	return code;
    return n;
}
