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DM-8146: fix fftw failure when using MKL based conda stack #194

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Oct 12, 2021
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DM-8146: fix fftw failure when using MKL based conda stack #194

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11 changes: 6 additions & 5 deletions src/SincCoeffs.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -423,12 +423,13 @@ std::shared_ptr<afw::image::Image<PixelT>> calcImageKSpaceReal(double const rad1
int xcen = wid / 2, ycen = wid / 2;
FftShifter fftshift(wid);

boost::shared_array<double> cimg(new double[wid * wid]);
double* c = cimg.get();
boost::shared_array<std::complex<double>> cimg(new std::complex<double>[wid * wid]);
std::complex<double>* c = cimg.get();
// fftplan args: nx, ny, *in, *out, kindx, kindy, flags
// - done in-situ if *in == *out
fftw_plan plan = fftw_plan_r2r_2d(wid, wid, c, c, FFTW_R2HC, FFTW_R2HC, FFTW_ESTIMATE);

fftw_plan plan = fftw_plan_dft_2d(wid, wid, reinterpret_cast<fftw_complex*>(c),
reinterpret_cast<fftw_complex*>(c), FFTW_BACKWARD, FFTW_ESTIMATE);
// compute the k-space values and put them in the cimg array
double const twoPiRad1 = geom::TWOPI * rad1;
double const twoPiRad2 = geom::TWOPI * rad2;
Expand All @@ -451,7 +452,7 @@ std::shared_ptr<afw::image::Image<PixelT>> calcImageKSpaceReal(double const rad1
}
}
int fxy = fftshift.shift(wid / 2);
c[fxy * wid + fxy] = geom::PI * (rad2 * rad2 - rad1 * rad1);
c[fxy * wid + fxy] = {geom::PI * (rad2 * rad2 - rad1 * rad1), 0.};

// perform the fft and clean up after ourselves
fftw_execute(plan);
Expand All @@ -468,7 +469,7 @@ std::shared_ptr<afw::image::Image<PixelT>> calcImageKSpaceReal(double const rad1
// now need to reflect the quadrant we solved to the other three
int fX = iX < hwid ? hwid - iX - 1 : iX - hwid + 1;
int fY = iY < hwid ? hwid - iY - 1 : iY - hwid + 1;
*ptr = static_cast<PixelT>(c[fY * wid + fX] / (wid * wid));
*ptr = static_cast<PixelT>(c[fY * wid + fX].real() / (wid * wid));
iX++;
}
}
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