fft.h


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#include <math.h>
#include "complex.h"

#ifndef FALSE
#define FALSE (0)
#endif

#ifndef TRUE
#define TRUE (1)
#endif

static inline double
rad_to_degree (double theta)
{
    return theta * (360.0 / (2 * M_PI));
}

void
fft (complex_t *buffer, int n);

void
ifft (complex_t *buffer, int n);

/* Fourier transform an n x n array */
void
fft_2d (complex_t *buffer, int n);

void
ifft_2d (complex_t *buffer, int n);

/* Shifts the zero component to the center of the array */
void
shift (complex_t *buffer, int n);

void
shift_2d (complex_t *buffer, int n);

void
fft_shift_2d (complex_t *buffer, int n);

void
ifft_shift_2d (complex_t *buffer, int n);

void
show_image (const char *name, complex_t *image, int n);