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Made member functions of kissfft class const-correct.

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Also made member functions static where appropriate.
This commit is contained in:
Ralph Tandetzky 2016-04-21 10:42:20 +02:00
parent 071e47d8ca
commit 3c96a24710
1 changed files with 20 additions and 20 deletions
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40
kissfft.hh
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@ -49,7 +49,7 @@ struct traits
std::vector<cpx_type> _twiddles; std::vector<cpx_type> _twiddles;
const cpx_type twiddle(int i) { return _twiddles[i]; } const cpx_type twiddle(int i) const { return _twiddles[i]; }
}; };
} }
@ -70,13 +70,13 @@ class kissfft
_traits.prepare(_twiddles, _nfft,_inverse ,_stageRadix, _stageRemainder); _traits.prepare(_twiddles, _nfft,_inverse ,_stageRadix, _stageRemainder);
} }
void transform(const cpx_type * src , cpx_type * dst) void transform(const cpx_type * src , cpx_type * dst) const
{ {
kf_work(0, dst, src, 1,1); kf_work(0, dst, src, 1,1);
} }
private: private:
void kf_work( int stage,cpx_type * Fout, const cpx_type * f, size_t fstride,size_t in_stride) void kf_work( int stage,cpx_type * Fout, const cpx_type * f, size_t fstride,size_t in_stride) const
{ {
int p = _stageRadix[stage]; int p = _stageRadix[stage];
int m = _stageRemainder[stage]; int m = _stageRemainder[stage];
@ -112,16 +112,16 @@ class kissfft
} }
// these were #define macros in the original kiss_fft // these were #define macros in the original kiss_fft
void C_ADD( cpx_type & c,const cpx_type & a,const cpx_type & b) { c=a+b;} static void C_ADD( cpx_type & c,const cpx_type & a,const cpx_type & b) { c=a+b;}
void C_MUL( cpx_type & c,const cpx_type & a,const cpx_type & b) { c=a*b;} static void C_MUL( cpx_type & c,const cpx_type & a,const cpx_type & b) { c=a*b;}
void C_SUB( cpx_type & c,const cpx_type & a,const cpx_type & b) { c=a-b;} static void C_SUB( cpx_type & c,const cpx_type & a,const cpx_type & b) { c=a-b;}
void C_ADDTO( cpx_type & c,const cpx_type & a) { c+=a;} static void C_ADDTO( cpx_type & c,const cpx_type & a) { c+=a;}
void C_FIXDIV( cpx_type & ,int ) {} // NO-OP for float types static void C_FIXDIV( cpx_type & ,int ) {} // NO-OP for float types
scalar_type S_MUL( const scalar_type & a,const scalar_type & b) { return a*b;} static scalar_type S_MUL( const scalar_type & a,const scalar_type & b) { return a*b;}
scalar_type HALF_OF( const scalar_type & a) { return a*.5;} static scalar_type HALF_OF( const scalar_type & a) { return a*.5;}
void C_MULBYSCALAR(cpx_type & c,const scalar_type & a) {c*=a;} static void C_MULBYSCALAR(cpx_type & c,const scalar_type & a) {c*=a;}
void kf_bfly2( cpx_type * Fout, const size_t fstride, int m) void kf_bfly2( cpx_type * Fout, const size_t fstride, int m) const
{ {
for (int k=0;k<m;++k) { for (int k=0;k<m;++k) {
cpx_type t = Fout[m+k] * _traits.twiddle(k*fstride); cpx_type t = Fout[m+k] * _traits.twiddle(k*fstride);
@ -130,7 +130,7 @@ class kissfft
} }
} }
void kf_bfly4( cpx_type * Fout, const size_t fstride, const size_t m) void kf_bfly4( cpx_type * Fout, const size_t fstride, const size_t m) const
{ {
cpx_type scratch[7]; cpx_type scratch[7];
int negative_if_inverse = _inverse * -2 +1; int negative_if_inverse = _inverse * -2 +1;
@ -152,11 +152,11 @@ class kissfft
} }
} }
void kf_bfly3( cpx_type * Fout, const size_t fstride, const size_t m) void kf_bfly3( cpx_type * Fout, const size_t fstride, const size_t m) const
{ {
size_t k=m; size_t k=m;
const size_t m2 = 2*m; const size_t m2 = 2*m;
cpx_type *tw1,*tw2; const cpx_type *tw1,*tw2;
cpx_type scratch[5]; cpx_type scratch[5];
cpx_type epi3; cpx_type epi3;
epi3 = _twiddles[fstride*m]; epi3 = _twiddles[fstride*m];
@ -187,13 +187,13 @@ class kissfft
}while(--k); }while(--k);
} }
void kf_bfly5( cpx_type * Fout, const size_t fstride, const size_t m) void kf_bfly5( cpx_type * Fout, const size_t fstride, const size_t m) const
{ {
cpx_type *Fout0,*Fout1,*Fout2,*Fout3,*Fout4; cpx_type *Fout0,*Fout1,*Fout2,*Fout3,*Fout4;
size_t u; size_t u;
cpx_type scratch[13]; cpx_type scratch[13];
cpx_type * twiddles = &_twiddles[0]; const cpx_type * twiddles = &_twiddles[0];
cpx_type *tw; const cpx_type *tw;
cpx_type ya,yb; cpx_type ya,yb;
ya = twiddles[fstride*m]; ya = twiddles[fstride*m];
yb = twiddles[fstride*2*m]; yb = twiddles[fstride*2*m];
@ -259,10 +259,10 @@ class kissfft
const size_t fstride, const size_t fstride,
int m, int m,
int p int p
) ) const
{ {
int u,k,q1,q; int u,k,q1,q;
cpx_type * twiddles = &_twiddles[0]; const cpx_type * twiddles = &_twiddles[0];
cpx_type t; cpx_type t;
int Norig = _nfft; int Norig = _nfft;
cpx_type scratchbuf[p]; cpx_type scratchbuf[p];