window.c

/*
 * Copyright (c) 2002, 2015 Jens Keiner, Stefan Kunis, Daniel Potts
 *
 * 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.
 */

/* $Id: util.c 3483 2010-04-23 19:02:34Z keiner $ */

#include "infft.h"

#if defined(DIRAC_DELTA)
#elif defined(GAUSSIAN)
  static const INT m2K_[] = {0, 1, 3, 6, 7, 9, 11, 13, 15, 17, 19, 21, 22, 23, 24};
#elif defined(B_SPLINE)
  static const INT m2K_[] = {0, 0, 4, 7, 10, 13, 15, 17, 19, 22, 24};
#elif defined(SINC_POWER)
  static const INT m2K_[] = {0, 0, 2, 5, 8, 11, 12, 14, 16, 18, 21, 23, 24, 24};
#else /* Kaiser-Bessel is the default. */
  static const INT m2K_[] = {1, 3, 7, 9, 14, 17, 20, 23, 24};
#endif

INT Y(m2K)(const INT m)
{
  int j = MIN(((int)(m)), ((int)((sizeof(m2K_) / sizeof(m2K_[0])) - 1)));
  return (INT)((1U << m2K_[j]) * (m + 2));
}