Added missing dgeo.c and dgeo.h files.

/**

* @file         dgeo.c

* @brief        Manage differential geometry maps (to correct pixel positions)

* @date         12/02/2015

* @copyright

*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

*

*       This file part of:      SExtractor

*

*       Copyright:              (C) 1993-2015 IAP/CNRS/UPMC

*

*       License:                GNU General Public License

*

*       SExtractor 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 3 of the License, or

*       (at your option) any later version.

*       SExtractor 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 SExtractor. If not, see <http://www.gnu.org/licenses/>.

*

*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/

#ifdef HAVE_CONFIG_H

#include        "config.h"

#endif

#include	<math.h>

#include	<stdio.h>

#include	<stdlib.h>

#include	<string.h>

#include	"define.h"

#include	"globals.h"

#include	"dgeo.h"

#include	"field.h"

/****** dgeo_copy ************************************************************

PROTO	int dgeo_copy(picstruct *dgeofield, PIXTYPE *destx, PIXTYPE *desty,

		int w,int h, int ix,int iy)

PURPOSE	Copy a small part of the differential geometry map components to output

	rasters.

INPUT	Pointer to the dgeofield structure,

	Pointer to the output x map component,

	Pointer to the output y map component,

	width in pixels,

	height in pixels,

	offset in x,

	offset in y.

OUTPUT	RETURN_OK if successful, RETURN_ERROR otherwise.

NOTES	-.

AUTHOR	E. Bertin (IAP)

VERSION	02/12/2015

 ***/

int	dgeo_copy(picstruct *dgeofield, PIXTYPE *destx, PIXTYPE *desty,

		int w,int h, int ix,int iy)

  {

   int		i,y, xmin,xmax,ymin,ymax,w2;

/* First set the output to 0 */

  if (destx)

    memset(destx, 0, w*h*sizeof(PIXTYPE));

  if (desty)

    memset(desty, 0, w*h*sizeof(PIXTYPE));

/* Don't go further if out of frame!! */

  if (!dgeofield || ix<0 || ix>=dgeofield->width

	|| iy<dgeofield->ymin || iy>=dgeofield->ymax)

    return RETURN_ERROR;

/* Set the image boundaries */

  w2 = w;

  ymin = iy-h/2;

  ymax = ymin + h;

  if (ymin<dgeofield->ymin)

    {

    if (destx)

      destx += (dgeofield->ymin-ymin)*w;

    if (desty)

      desty += (dgeofield->ymin-ymin)*w;

    ymin = dgeofield->ymin;

    }

  if (ymax>dgeofield->ymax)

    ymax = dgeofield->ymax;

  xmin = ix-w/2;

  xmax = xmin + w;

  if (xmax>dgeofield->width)

    {

    w2 -= xmax-dgeofield->width;

    xmax = dgeofield->width;

    }

  if (xmin<0)

    {

    if (destx)

      destx += -xmin;

    if (desty)

      desty += -xmin;

    w2 -= -xmin;

    xmin = 0;

    }

/* Copy the right pixels to the destination */

  if (destx)

    for (y=ymin; y<ymax; y++, destx += w)

      memcpy(destx, &DGEOPIXX(dgeofield, xmin, y), w2*sizeof(PIXTYPE));

  if (desty)

    for (y=ymin; y<ymax; y++, desty += w)

      memcpy(desty, &DGEOPIXY(dgeofield, xmin, y), w2*sizeof(PIXTYPE));

  return RETURN_OK;

  }

/**

* @file         dgeo.h

* @brief        Include file for dgeo.c.

* @date         02/12/2015

* @copyright

*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

*

*       This file part of:      SExtractor

*

*       Copyright:              (C) 2011-2015 Emmanuel Bertin -- IAP/CNRS/UPMC

*

*       License:                GNU General Public License

*

*       SExtractor 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 3 of the License, or

*       (at your option) any later version.

*       SExtractor 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 SExtractor. If not, see <http://www.gnu.org/licenses/>.

*

*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/

#ifndef _DGEO_H_

#define _DGEO_H_

//----------------------------- Internal constants ----------------------------

//------------------------------- functions -----------------------------------

extern int	dgeo_copy(picstruct *dgeofield, PIXTYPE *destx, PIXTYPE *desty,

		int w,int h, int ix,int iy);

#endif