view Lib/fftw-3.2.1/rdft/rdft2-inplace-strides.c @ 1:e86e9c111b29

Updates stuff that potentially fixes the memory leak and also makes it work on Windows and Linux (Need to test). Still have to fix fftw include for linux in Jucer.

/*
 * Copyright (c) 2003, 2007-8 Matteo Frigo
 * Copyright (c) 2003, 2007-8 Massachusetts Institute of Technology
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */


#include "rdft.h"

/* Check if the vecsz/sz strides are consistent with the problem
   being in-place for vecsz.dim[vdim], or for all dimensions
   if vdim == RNK_MINFTY.  We can't just use tensor_inplace_strides
   because rdft transforms have the unfortunate property of
   differing input and output sizes.   This routine is not
   exhaustive; we only return 1 for the most common case.  */
int X(rdft2_inplace_strides)(const problem_rdft2 *p, int vdim)
{
     INT N, Nc;
     INT rs, cs;
     int i;
     
     for (i = 0; i + 1 < p->sz->rnk; ++i)
	  if (p->sz->dims[i].is != p->sz->dims[i].os)
	       return 0;

     if (!FINITE_RNK(p->vecsz->rnk) || p->vecsz->rnk == 0)
	  return 1;
     if (!FINITE_RNK(vdim)) { /* check all vector dimensions */
	  for (vdim = 0; vdim < p->vecsz->rnk; ++vdim)
	       if (!X(rdft2_inplace_strides)(p, vdim))
		    return 0;
	  return 1;
     }

     A(vdim < p->vecsz->rnk);
     if (p->sz->rnk == 0)
	  return(p->vecsz->dims[vdim].is == p->vecsz->dims[vdim].os);

     N = X(tensor_sz)(p->sz);
     Nc = (N / p->sz->dims[p->sz->rnk-1].n) *
	  (p->sz->dims[p->sz->rnk-1].n/2 + 1);
     X(rdft2_strides)(p->kind, p->sz->dims + p->sz->rnk - 1, &rs, &cs);

     /* the factor of 2 comes from the fact that RS is the stride
	of p->r0 and p->r1, which is twice as large as the strides
	in the r2r case */
     return(p->vecsz->dims[vdim].is == p->vecsz->dims[vdim].os
	    && (X(iabs)(2 * p->vecsz->dims[vdim].os)
		>= X(imax)(2 * Nc * X(iabs)(cs), N * X(iabs)(rs))));
}