/* 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: zpath.c 8022 2007-06-05 22:23:38Z giles $ */
/* Basic path operators */
#include "math_.h"
#include "ghost.h"
#include "oper.h"
#include "igstate.h"
#include "gsmatrix.h"
#include "gspath.h"
#include "store.h"

/* Forward references */
private int common_to(i_ctx_t *,
		      int (*)(gs_state *, floatp, floatp));
private int common_curve(i_ctx_t *,
  int (*)(gs_state *, floatp, floatp, floatp, floatp, floatp, floatp));

/* - newpath - */
private int
znewpath(i_ctx_t *i_ctx_p)
{
    return gs_newpath(igs);
}

/* - currentpoint <x> <y> */
private int
zcurrentpoint(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    gs_point pt;
    int code = gs_currentpoint(igs, &pt);

    if (code < 0)
	return code;
    push(2);
    make_real(op - 1, pt.x);
    make_real(op, pt.y);
    return 0;
}

/* <x> <y> moveto - */
int
zmoveto(i_ctx_t *i_ctx_p)
{
    return common_to(i_ctx_p, gs_moveto);
}

/* <dx> <dy> rmoveto - */
int
zrmoveto(i_ctx_t *i_ctx_p)
{
    return common_to(i_ctx_p, gs_rmoveto);
}

/* <x> <y> lineto - */
int
zlineto(i_ctx_t *i_ctx_p)
{
    return common_to(i_ctx_p, gs_lineto);
}

/* <dx> <dy> rlineto - */
int
zrlineto(i_ctx_t *i_ctx_p)
{
    return common_to(i_ctx_p, gs_rlineto);
}

/* Common code for [r](move/line)to */
private int
common_to(i_ctx_t *i_ctx_p,
	  int (*add_proc)(gs_state *, floatp, floatp))
{
    os_ptr op = osp;
    double opxy[2];
    int code;

    if ((code = num_params(op, 2, opxy)) < 0 ||
	(code = (*add_proc)(igs, opxy[0], opxy[1])) < 0
	)
	return code;
    pop(2);
    return 0;
}

/* <x1> <y1> <x2> <y2> <x3> <y3> curveto - */
int
zcurveto(i_ctx_t *i_ctx_p)
{
    return common_curve(i_ctx_p, gs_curveto);
}

/* <dx1> <dy1> <dx2> <dy2> <dx3> <dy3> rcurveto - */
int
zrcurveto(i_ctx_t *i_ctx_p)
{
    return common_curve(i_ctx_p, gs_rcurveto);
}

/* Common code for [r]curveto */
private int
common_curve(i_ctx_t *i_ctx_p,
	     int (*add_proc)(gs_state *, floatp, floatp, floatp, floatp, floatp, floatp))
{
    os_ptr op = osp;
    double opxy[6];
    int code;

    if ((code = num_params(op, 6, opxy)) < 0)
	return code;
    code = (*add_proc)(igs, opxy[0], opxy[1], opxy[2], opxy[3], opxy[4], opxy[5]);
    if (code >= 0)
	pop(6);
    return code;
}

/* - closepath - */
int
zclosepath(i_ctx_t *i_ctx_p)
{
    return gs_closepath(igs);
}

/* - initclip - */
private int
zinitclip(i_ctx_t *i_ctx_p)
{
    return gs_initclip(igs);
}

/* - clip - */
private int
zclip(i_ctx_t *i_ctx_p)
{
    return gs_clip(igs);
}

/* - eoclip - */
private int
zeoclip(i_ctx_t *i_ctx_p)
{
    return gs_eoclip(igs);
}

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

const op_def zpath_op_defs[] =
{
    {"0clip", zclip},
    {"0closepath", zclosepath},
    {"0currentpoint", zcurrentpoint},
    {"6curveto", zcurveto},
    {"0eoclip", zeoclip},
    {"0initclip", zinitclip},
    {"2lineto", zlineto},
    {"2moveto", zmoveto},
    {"0newpath", znewpath},
    {"6rcurveto", zrcurveto},
    {"2rlineto", zrlineto},
    {"2rmoveto", zrmoveto},
    op_def_end(0)
};