/******************************************************************************
 *
 * Project:  OpenCPN
 * Purpose:  Extern C Linked Utilities
 * Author:   David Register
 *
 ***************************************************************************
 *   Copyright (C) 2010 by David S. Register   *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,  USA.             *
 ***************************************************************************
 *
 *
 */

#ifndef __CUTIL_H__
#define __CUTIL_H__

#ifdef __MSVC__
#include <windows.h>
#endif

#include <wx/dynarray.h>
#include <vector>

typedef struct {
  double x;
  double y;
} MyPoint;

typedef struct {
  float y;
  float x;
} float_2Dpt;

#ifdef __cplusplus
extern "C" int G_PtInPolygon(MyPoint *, int, float, float);
extern "C" int G_PtInPolygon_FL(float_2Dpt *, int, float, float);
extern "C" int Intersect_FL(float_2Dpt, float_2Dpt, float_2Dpt, float_2Dpt);

extern "C" int mysnprintf(char *buffer, int count, const char *format, ...);
extern "C" int NextPow2(int size);
extern "C" void DouglasPeucker(double *PointList, int fp, int lp,
                               double epsilon, std::vector<int> *keep);
extern "C" void DouglasPeuckerF(float *PointList, int fp, int lp,
                                double epsilon, std::vector<int> *keep);
extern "C" void DouglasPeuckerM(double *PointList, int fp, int lp,
                                double epsilon, std::vector<int> *keep);
extern "C" void DouglasPeuckerFI(float *PointList, int fp, int lp,
                                 double epsilon, std::vector<bool> &keep);
extern "C" void DouglasPeuckerDI(double *PointList, int fp, int lp,
                                 double epsilon, std::vector<bool> &keep);

#else /* __cplusplus */
extern int G_PtInPolygon(MyPoint *, int, float, float);
extern int mysnprintf(char *buffer, int count, const char *format, ...);
#endif

#ifdef __MSVC__
#ifdef __cplusplus
extern "C" long __stdcall MyUnhandledExceptionFilter(
    struct _EXCEPTION_POINTERS *ExceptionInfo);
#else
extern long __stdcall MyUnhandledExceptionFilter(
    struct _EXCEPTION_POINTERS *ExceptionInfo);
#endif
#endif

inline int roundint(double x) {
#ifdef __WXOSX__
  return (int)round(x);  // FS#1278
#else
  int tmp = static_cast<int>(x);
  tmp += (x - tmp >= .5) - (x - tmp <= -.5);
  return tmp;
#endif
}

//-------------------------------------------------------------------------------------------------------
//  Cohen & Sutherland Line clipping algorithms
//-------------------------------------------------------------------------------------------------------
/*
 *
 * Copyright (C) 1999,2000,2001,2002,2003 Percy Zahl
 *
 * Authors: Percy Zahl <zahl@users.sf.net>
 * additional features: Andreas Klust <klust@users.sf.net>
 * WWW Home: http://gxsm.sf.net
 *
 */

typedef enum { Visible, Invisible } ClipResult;

#ifdef __cplusplus
extern "C" ClipResult cohen_sutherland_line_clip_d(double *x0, double *y0,
                                                   double *x1, double *y1,
                                                   double xmin_, double xmax_,
                                                   double ymin_, double ymax_);

extern "C" ClipResult cohen_sutherland_line_clip_i(int *x0, int *y0, int *x1,
                                                   int *y1, int xmin_,
                                                   int xmax_, int ymin_,
                                                   int ymax_);

#endif

//      Simple and fast CRC32 calculator

extern "C" unsigned int crc32buf(unsigned char *buf, size_t len);

#endif
