Fast Fourier Transform
[Linear Processing]

---

Detailed Description

Fast Fourier Transform based on fftw3

Functions
FLGR_Ret	flgr1d_fft_backward_cplx (FLGR_Data1D *datdest, FLGR_Data1D *datfft)
FLGR_Ret	flgr1d_fft_backward_real (FLGR_Data1D *datdest, FLGR_Data1D *datfft)
FLGR_Ret	flgr1d_fft_forward_cplx (FLGR_Data1D *datfft, FLGR_Data1D *datsrc)
FLGR_Ret	flgr1d_fft_forward_real (FLGR_Data1D *datfft, FLGR_Data1D *datsrc)
FLGR_Ret	flgr2d_fft_backward_cplx (FLGR_Data2D *datdest, FLGR_Data2D *datfft)
FLGR_Ret	flgr2d_fft_backward_real (FLGR_Data2D *datdest, FLGR_Data2D *datfft)
FLGR_Ret	flgr2d_fft_forward_cplx (FLGR_Data2D *datfft, FLGR_Data2D *datsrc)
FLGR_Ret	flgr2d_fft_forward_real (FLGR_Data2D *datfft, FLGR_Data2D *datsrc)
FLGR_Ret	flgr2d_fft_switch_corner (FLGR_Data2D *datdest, FLGR_Data2D *datsrc)

---

Function Documentation

FLGR_Ret flgr1d_fft_backward_cplx	(	FLGR_Data1D *	datdest,
		FLGR_Data1D *	datfft
	)

Compute a Complex backward fft

Parameters:

	datdest	: pointer to FLGR_Data1D
	datfft	: pointer to FLGR_Data1D

Returns:

FLGR_RET_OK, ...

Definition at line 286 of file flgrLinearFFT.c.

FLGR_Ret flgr1d_fft_backward_real	(	FLGR_Data1D *	datdest,
		FLGR_Data1D *	datfft
	)

Compute a Real backward fft

Parameters:

	datdest	: pointer to FLGR_Data1D
	datfft	: pointer to FLGR_Data1D

Returns:

FLGR_RET_OK, ...

Definition at line 502 of file flgrLinearFFT.c.

FLGR_Ret flgr1d_fft_forward_cplx	(	FLGR_Data1D *	datfft,
		FLGR_Data1D *	datsrc
	)

Compute a Complex fft

Parameters:

	datfft	: pointer to FLGR_Data1D complex (spp=2)
	datsrc	: pointer to FLGR_Data1D complex (spp=2)

Returns:

FLGR_RET_OK, ...

Definition at line 184 of file flgrLinearFFT.c.

FLGR_Ret flgr1d_fft_forward_real	(	FLGR_Data1D *	datfft,
		FLGR_Data1D *	datsrc
	)

Compute a Real fft

Parameters:

	datfft	: pointer to FLGR_Data1D
	datsrc	: pointer to FLGR_Data1D

Returns:

FLGR_RET_OK, ...

Definition at line 391 of file flgrLinearFFT.c.

FLGR_Ret flgr2d_fft_backward_cplx	(	FLGR_Data2D *	datdest,
		FLGR_Data2D *	datfft
	)

Compute a Complex backward fft

Parameters:

	datdest	: pointer to FLGR_Data2D
	datfft	: pointer to FLGR_Data2D

Returns:

FLGR_RET_OK, ...

Definition at line 758 of file flgrLinearFFT.c.

FLGR_Ret flgr2d_fft_backward_real	(	FLGR_Data2D *	datdest,
		FLGR_Data2D *	datfft
	)

Compute a Real backward fft

Parameters:

	datdest	: pointer to FLGR_Data2D
	datfft	: pointer to FLGR_Data2D

Returns:

FLGR_RET_OK, ...

Definition at line 977 of file flgrLinearFFT.c.

FLGR_Ret flgr2d_fft_forward_cplx	(	FLGR_Data2D *	datfft,
		FLGR_Data2D *	datsrc
	)

Compute a Complex fft

Parameters:

	datfft	: pointer to FLGR_Data2D complex (spp=2)
	datsrc	: pointer to FLGR_Data2D complex (spp=2)

Returns:

FLGR_RET_OK, ...

Definition at line 655 of file flgrLinearFFT.c.

FLGR_Ret flgr2d_fft_forward_real	(	FLGR_Data2D *	datfft,
		FLGR_Data2D *	datsrc
	)

Compute a Real fft

Parameters:

	datsrc	: pointer to FLGR_Data2D
	datfft	: pointer to FLGR_Data2D

Returns:

FLGR_RET_OK, ...

Definition at line 864 of file flgrLinearFFT.c.

FLGR_Ret flgr2d_fft_switch_corner	(	FLGR_Data2D *	datdest,
		FLGR_Data2D *	datsrc
	)

Sort the 4 corners after a fft

Parameters:

	datsrc	: pointer to FLGR_Data2D
	datdest	: pointer to FLGR_Data2D

Returns:

FLGR_RET_OK, ...

Definition at line 1089 of file flgrLinearFFT.c.