Refactor Sk2x<T> + Sk4x<T> into SkNf<N,T> and SkNi<N,T>

src/opts/Sk4x_none.h

-// It is important _not_ to put header guards here.
-// This file will be intentionally included three times.
-
-#include "SkTypes.h"  // Keep this before any #ifdef for skbug.com/3362
-
-#if defined(SK4X_PREAMBLE)
-    #include "SkFloatingPoint.h"
-    #include <math.h>
-
-#elif defined(SK4X_PRIVATE)
-    typedef T Type;
-    typedef T Vector[4];
-
-    Vector fVec;
-
-    template <int m, int a, int s, int k>
-    static Sk4x Shuffle(const Sk4x&, const Sk4x&);
-
-    void set(const T vals[4]) { for (int i = 0; i < 4; i++) { fVec[i] = vals[i]; } }
-
-#else
-
-#define M(...) template <typename T> __VA_ARGS__ Sk4x<T>::
-
-M() Sk4x() {}
-M() Sk4x(T v) { fVec[0] = fVec[1] = fVec[2] = fVec[3] = v; }
-M() Sk4x(T a, T b, T c, T d) { fVec[0] = a; fVec[1] = b; fVec[2] = c; fVec[3] = d; }
-
-M()              Sk4x(const Sk4x<T>& other) { this->set(other.fVec);               }
-M(Sk4x<T>&) operator=(const Sk4x<T>& other) { this->set(other.fVec); return *this; }
-
-M(Sk4x<T>) Load       (const T vals[4]) { Sk4x r; r.set(vals); return r; }
-M(Sk4x<T>) LoadAligned(const T vals[4]) { return Load(vals);             }
-
-M(void) store       (T vals[4]) const { for (int i = 0; i < 4; i++) { vals[i] = fVec[i]; } }
-M(void) storeAligned(T vals[4]) const { this->store(vals); }
-
-M(template <typename Dst> Dst) reinterpret() const {
-    Dst d;
-    memcpy(&d.fVec, fVec, sizeof(fVec));
-    return d;
-}
-M(template <typename Dst> Dst) cast() const {
-    return Dst((typename Dst::Type)fVec[0],
-               (typename Dst::Type)fVec[1],
-               (typename Dst::Type)fVec[2],
-               (typename Dst::Type)fVec[3]);
-}
-
-M(bool) allTrue() const { return fVec[0] && fVec[1] && fVec[2] && fVec[3]; }
-M(bool) anyTrue() const { return fVec[0] || fVec[1] || fVec[2] || fVec[3]; }
-
-M(Sk4x<T>) bitNot() const { return Sk4x(~fVec[0], ~fVec[1], ~fVec[2], ~fVec[3]); }
-
-#define BINOP(op) fVec[0] op other.fVec[0], \
-                  fVec[1] op other.fVec[1], \
-                  fVec[2] op other.fVec[2], \
-                  fVec[3] op other.fVec[3]
-M(Sk4x<T>)   bitAnd(const Sk4x& other)    const { return Sk4x(BINOP(&)); }
-M(Sk4x<T>)    bitOr(const Sk4x& other)    const { return Sk4x(BINOP(|)); }
-M(Sk4x<T>)      add(const Sk4x<T>& other) const { return Sk4x(BINOP(+)); }
-M(Sk4x<T>) subtract(const Sk4x<T>& other) const { return Sk4x(BINOP(-)); }
-M(Sk4x<T>) multiply(const Sk4x<T>& other) const { return Sk4x(BINOP(*)); }
-M(Sk4x<T>)   divide(const Sk4x<T>& other) const { return Sk4x(BINOP(/)); }
-#undef BINOP
-
-template<> inline Sk4f Sk4f::rsqrt() const {
-    return Sk4f(sk_float_rsqrt(fVec[0]),
-                sk_float_rsqrt(fVec[1]),
-                sk_float_rsqrt(fVec[2]),
-                sk_float_rsqrt(fVec[3]));
-}
-
-template<> inline Sk4f Sk4f::sqrt() const {
-    return Sk4f(sqrtf(fVec[0]),
-                sqrtf(fVec[1]),
-                sqrtf(fVec[2]),
-                sqrtf(fVec[3]));
-}
-
-#define BOOL_BINOP(op) fVec[0] op other.fVec[0] ? -1 : 0, \
-                       fVec[1] op other.fVec[1] ? -1 : 0, \
-                       fVec[2] op other.fVec[2] ? -1 : 0, \
-                       fVec[3] op other.fVec[3] ? -1 : 0
-M(Sk4i)            equal(const Sk4x<T>& other) const { return Sk4i(BOOL_BINOP(==)); }
-M(Sk4i)         notEqual(const Sk4x<T>& other) const { return Sk4i(BOOL_BINOP(!=)); }
-M(Sk4i)         lessThan(const Sk4x<T>& other) const { return Sk4i(BOOL_BINOP( <)); }
-M(Sk4i)      greaterThan(const Sk4x<T>& other) const { return Sk4i(BOOL_BINOP( >)); }
-M(Sk4i)    lessThanEqual(const Sk4x<T>& other) const { return Sk4i(BOOL_BINOP(<=)); }
-M(Sk4i) greaterThanEqual(const Sk4x<T>& other) const { return Sk4i(BOOL_BINOP(>=)); }
-#undef BOOL_BINOP
-
-M(Sk4x<T>) Min(const Sk4x<T>& a, const Sk4x<T>& b) {
-    return Sk4x(SkTMin(a.fVec[0], b.fVec[0]),
-                SkTMin(a.fVec[1], b.fVec[1]),
-                SkTMin(a.fVec[2], b.fVec[2]),
-                SkTMin(a.fVec[3], b.fVec[3]));
-}
-
-M(Sk4x<T>) Max(const Sk4x<T>& a, const Sk4x<T>& b) {
-    return Sk4x(SkTMax(a.fVec[0], b.fVec[0]),
-                SkTMax(a.fVec[1], b.fVec[1]),
-                SkTMax(a.fVec[2], b.fVec[2]),
-                SkTMax(a.fVec[3], b.fVec[3]));
-}
-
-M(template <int m, int a, int s, int k> Sk4x<T>) Shuffle(const Sk4x<T>& x, const Sk4x<T>& y) {
-    return Sk4x(m < 4 ? x.fVec[m] : y.fVec[m-4],
-                a < 4 ? x.fVec[a] : y.fVec[a-4],
-                s < 4 ? x.fVec[s] : y.fVec[s-4],
-                k < 4 ? x.fVec[k] : y.fVec[k-4]);
-}
-
-M(Sk4x<T>) aacc() const { return Shuffle<0,0,2,2>(*this, *this); }
-M(Sk4x<T>) bbdd() const { return Shuffle<1,1,3,3>(*this, *this); }
-M(Sk4x<T>) badc() const { return Shuffle<1,0,3,2>(*this, *this); }
-
-#undef M
-
-#endif