numeric.h

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#ifndef SIRIUS_UTILS_NUMERIC_H_
#define SIRIUS_UTILS_NUMERIC_H_

#include "sirius/types.h"

namespace sirius {
namespace utils {

int Gcd(int a, int b);

void FFTShift2D(const double* data, const Size& size, double* shifted_data);

void IFFTShift2D(const double* data, const Size& size, double* shifted_data);

void IFFTShift2DUncentered(const double* data, const Size& size,
                           const Point& hot_point, double* shifted_data);

void FFTShift2DUncentered(const double* data, const Size& size,
                          const Point& hot_point, double* shifted_data);

std::vector<double> ComputeFFTFreq(int n_samples, bool half = true);

Size GenerateDyadicSize(const Size& size, const int res_in,
                        const Size& padding_size);

Size GenerateZoomCompliantSize(const Size& size, const ZoomRatio& zoom_r);

void CreateMeshgrid(int x_min, int x_max, int y_min, int y_max,
                    std::vector<int>& xx, std::vector<int>& yy);

}  // namespace utils
}  // namespace sirius

#endif  // SIRIUS_UTILS_NUMERIC_H_