log2_horner() [1/2]

template<typename Derived, int IntBits, int FracBits>

template<typename PolyType>

static FASTLED_FORCE_INLINE Derived fl::fixed_point_base< Derived, IntBits, FracBits >::log2_horner ( raw_type int_part, PolyType t_ifrac, PolyType c0, PolyType c1, PolyType c2, PolyType c3, fl::false_type  )

inlinestaticprivate

Definition at line 392 of file base.h.

                                                                   {
        constexpr int IFRAC = traits::IFRAC;
        PolyType acc = c3;
        acc = c2 + ((acc * t_ifrac) >> IFRAC);
        acc = c1 + ((acc * t_ifrac) >> IFRAC);
        acc = c0 + ((acc * t_ifrac) >> IFRAC);
        PolyType frac_part = (acc * t_ifrac) >> IFRAC;
        raw_type frac_result = static_cast<raw_type>(frac_part >> (IFRAC - FRAC_BITS));
        return Derived::from_raw(static_cast<raw_type>(static_cast<unsigned_raw_type>(int_part) << FRAC_BITS) + frac_result);
    }

References FASTLED_FORCE_INLINE, FRAC_BITS, and fl::fixed_point_traits< IntBits, FracBits >::IFRAC.