/* Copyright (C) 1989, 1995, 1997, 1998, 1999 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.
*/

/*$Id$ */
/* PostScript Level 1 additional path operators */
#include "memory_.h"
#include "ghost.h"
#include "oper.h"
#include "oparc.h"		/* for prototypes */
#include "estack.h"		/* for pathforall */
#include "ialloc.h"
#include "igstate.h"
#include "gsstruct.h"
#include "gspath.h"
#include "store.h"

/* Forward references */
private int common_arc(P2(i_ctx_t *,
	  int (*)(P6(gs_state *, floatp, floatp, floatp, floatp, floatp))));
private int common_arct(P2(i_ctx_t *, float *));

/* <x> <y> <r> <ang1> <ang2> arc - */
int
zarc(i_ctx_t *i_ctx_p)
{
    return common_arc(i_ctx_p, gs_arc);
}

/* <x> <y> <r> <ang1> <ang2> arcn - */
int
zarcn(i_ctx_t *i_ctx_p)
{
    return common_arc(i_ctx_p, gs_arcn);
}

/* Common code for arc[n] */
private int
common_arc(i_ctx_t *i_ctx_p,
      int (*aproc)(P6(gs_state *, floatp, floatp, floatp, floatp, floatp)))
{
    os_ptr op = osp;
    double xyra[5];		/* x, y, r, ang1, ang2 */
    int code = num_params(op, 5, xyra);

    if (code < 0)
	return code;
    code = (*aproc)(igs, xyra[0], xyra[1], xyra[2], xyra[3], xyra[4]);
    if (code >= 0)
	pop(5);
    return code;
}

/* <x1> <y1> <x2> <y2> <r> arct - */
int
zarct(i_ctx_t *i_ctx_p)
{
    int code = common_arct(i_ctx_p, (float *)0);

    if (code < 0)
	return code;
    pop(5);
    return 0;
}

/* <x1> <y1> <x2> <y2> <r> arcto <xt1> <yt1> <xt2> <yt2> */
private int
zarcto(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    float tanxy[4];		/* xt1, yt1, xt2, yt2 */
    int code = common_arct(i_ctx_p, tanxy);

    if (code < 0)
	return code;
    make_real(op - 4, tanxy[0]);
    make_real(op - 3, tanxy[1]);
    make_real(op - 2, tanxy[2]);
    make_real(op - 1, tanxy[3]);
    pop(1);
    return 0;
}

/* Common code for arct[o] */
private int
common_arct(i_ctx_t *i_ctx_p, float *tanxy)
{
    os_ptr op = osp;
    double args[5];		/* x1, y1, x2, y2, r */
    int code = num_params(op, 5, args);

    if (code < 0)
	return code;
    return gs_arcto(igs, args[0], args[1], args[2], args[3], args[4], tanxy);
}

/* - .dashpath - */
private int
zdashpath(i_ctx_t *i_ctx_p)
{
    return gs_dashpath(igs);
}

/* - flattenpath - */
private int
zflattenpath(i_ctx_t *i_ctx_p)
{
    return gs_flattenpath(igs);
}

/* - reversepath - */
private int
zreversepath(i_ctx_t *i_ctx_p)
{
    return gs_reversepath(igs);
}

/* - strokepath - */
private int
zstrokepath(i_ctx_t *i_ctx_p)
{
    return gs_strokepath(igs);
}

/* - clippath - */
private int
zclippath(i_ctx_t *i_ctx_p)
{
    return gs_clippath(igs);
}

/* <bool> .pathbbox <llx> <lly> <urx> <ury> */
private int
zpathbbox(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    gs_rect box;
    int code;

    check_type(*op, t_boolean);
    code = gs_upathbbox(igs, &box, op->value.boolval);
    if (code < 0)
	return code;
    push(3);
    make_real(op - 3, box.p.x);
    make_real(op - 2, box.p.y);
    make_real(op - 1, box.q.x);
    make_real(op, box.q.y);
    return 0;
}

/* <moveproc> <lineproc> <curveproc> <closeproc> pathforall - */
private int path_continue(P1(i_ctx_t *));
private int path_cleanup(P1(i_ctx_t *));
private int
zpathforall(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    gs_path_enum *penum;
    int code;

    check_proc(op[-3]);
    check_proc(op[-2]);
    check_proc(op[-1]);
    check_proc(*op);
    check_estack(8);
    if ((penum = gs_path_enum_alloc(imemory, "pathforall")) == 0)
	return_error(e_VMerror);
    code = gs_path_enum_init(penum, igs);
    if (code < 0) {
	ifree_object(penum, "path_cleanup");
	return code;
    }
    /* Push a mark, the four procedures, and the path enumerator. */
    push_mark_estack(es_for, path_cleanup);	/* iterator */
    memcpy(esp + 1, op - 3, 4 * sizeof(ref));	/* 4 procs */
    esp += 5;
    make_istruct(esp, 0, penum);
    push_op_estack(path_continue);
    pop(4);
    op -= 4;
    return o_push_estack;
}
/* Continuation procedure for pathforall */
private void pf_push(P3(i_ctx_t *, gs_point *, int));
private int
path_continue(i_ctx_t *i_ctx_p)
{
    gs_path_enum *penum = r_ptr(esp, gs_path_enum);
    gs_point ppts[3];
    int code;

    /* Make sure we have room on the o-stack for the worst case */
    /* before we enumerate the next path element. */
    check_ostack(6);		/* 3 points for curveto */
    code = gs_path_enum_next(penum, ppts);
    switch (code) {
	case 0:		/* all done */
	    esp -= 6;
	    path_cleanup(i_ctx_p);
	    return o_pop_estack;
	default:		/* error */
	    return code;
	case gs_pe_moveto:
	    esp[2] = esp[-4];	/* moveto proc */
	    pf_push(i_ctx_p, ppts, 1);
	    break;
	case gs_pe_lineto:
	    esp[2] = esp[-3];	/* lineto proc */
	    pf_push(i_ctx_p, ppts, 1);
	    break;
	case gs_pe_curveto:
	    esp[2] = esp[-2];	/* curveto proc */
	    pf_push(i_ctx_p, ppts, 3);
	    break;
	case gs_pe_closepath:
	    esp[2] = esp[-1];	/* closepath proc */
	    break;
    }
    push_op_estack(path_continue);
    ++esp;			/* include pushed procedure */
    return o_push_estack;
}
/* Internal procedure to push one or more points */
private void
pf_push(i_ctx_t *i_ctx_p, gs_point * ppts, int n)
{
    os_ptr op = osp;

    while (n--) {
	op += 2;
	make_real(op - 1, ppts->x);
	make_real(op, ppts->y);
	ppts++;
    }
    osp = op;
}
/* Clean up after a pathforall */
private int
path_cleanup(i_ctx_t *i_ctx_p)
{
    gs_path_enum *penum = r_ptr(esp + 6, gs_path_enum);

    gs_path_enum_cleanup(penum);
    ifree_object(penum, "path_cleanup");
    return 0;
}

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

const op_def zpath1_op_defs[] =
{
    {"5arc", zarc},
    {"5arcn", zarcn},
    {"5arct", zarct},
    {"5arcto", zarcto},
    {"0clippath", zclippath},
    {"0.dashpath", zdashpath},
    {"0flattenpath", zflattenpath},
    {"4pathforall", zpathforall},
    {"0reversepath", zreversepath},
    {"0strokepath", zstrokepath},
    {"1.pathbbox", zpathbbox},
		/* Internal operators */
    {"0%path_continue", path_continue},
    op_def_end(0)
};