/* Copyright (C) 2001-2023 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 the license contained in the file LICENSE in this distribution.

   Refer to licensing information at http://www.artifex.com or contact
   Artifex Software, Inc.,  39 Mesa Street, Suite 108A, San Francisco,
   CA 94129, USA, for further information.
*/


/* 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 */
static int common_to(i_ctx_t *,
                      int (*)(gs_gstate *, double, double));
static int common_curve(i_ctx_t *,
  int (*)(gs_gstate *, double, double, double, double, double, double));

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

/* - currentpoint <x> <y> */
static 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;
}

/* - .currentpoint_valid <bool> */
static int
zcurrentpoint_valid(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    gs_point pt;
    int code = gs_currentpoint(igs, &pt);

    push(1);
    make_bool(op, code == 0);
    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 */
static int
common_to(i_ctx_t *i_ctx_p,
          int (*add_proc)(gs_gstate *, double, double))
{
    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 */
static int
common_curve(i_ctx_t *i_ctx_p,
             int (*add_proc)(gs_gstate *, double, double, double, double, double, double))
{
    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 - */
static int
zinitclip(i_ctx_t *i_ctx_p)
{
    return gs_initclip(igs);
}

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

/* - eoclip - */
static 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},
    {"0.currentpoint_valid", zcurrentpoint_valid},
    {"6curveto", zcurveto},
    {"0eoclip", zeoclip},
    {"0initclip", zinitclip},
    {"2lineto", zlineto},
    {"2moveto", zmoveto},
    {"0newpath", znewpath},
    {"6rcurveto", zrcurveto},
    {"2rlineto", zrlineto},
    {"2rmoveto", zrmoveto},
    op_def_end(0)
};