59 lines
2.2 KiB
C++
59 lines
2.2 KiB
C++
#pragma once
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#include "fl/stdint.h"
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#include "fl/namespace.h"
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FASTLED_NAMESPACE_BEGIN
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/// @addtogroup FractionalTypes
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/// @{
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/// Template class for representing fractional ints.
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/// @tparam T underlying type for data storage
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/// @tparam F number of fractional bits
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/// @tparam I number of integer bits
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template<class T, int F, int I> class qfx {
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T i:I; ///< Integer value of number
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T f:F; ///< Fractional value of number
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public:
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/// Constructor, storing a float as a fractional int
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qfx(float fx) { i = fx; f = (fx-i) * (1<<F); }
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/// Constructor, storing a fractional int directly
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qfx(uint8_t _i, uint8_t _f) {i=_i; f=_f; }
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/// Multiply the fractional int by a value
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uint32_t operator*(uint32_t v) { return (v*i) + ((v*f)>>F); }
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/// @copydoc operator*(uint32_t)
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uint16_t operator*(uint16_t v) { return (v*i) + ((v*f)>>F); }
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/// @copydoc operator*(uint32_t)
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int32_t operator*(int32_t v) { return (v*i) + ((v*f)>>F); }
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/// @copydoc operator*(uint32_t)
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int16_t operator*(int16_t v) { return (v*i) + ((v*f)>>F); }
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#if defined(FASTLED_ARM) | defined(FASTLED_RISCV) | defined(FASTLED_APOLLO3)
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/// @copydoc operator*(uint32_t)
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int operator*(int v) { return (v*i) + ((v*f)>>F); }
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#endif
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};
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template<class T, int F, int I> static uint32_t operator*(uint32_t v, qfx<T,F,I> & q) { return q * v; }
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template<class T, int F, int I> static uint16_t operator*(uint16_t v, qfx<T,F,I> & q) { return q * v; }
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template<class T, int F, int I> static int32_t operator*(int32_t v, qfx<T,F,I> & q) { return q * v; }
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template<class T, int F, int I> static int16_t operator*(int16_t v, qfx<T,F,I> & q) { return q * v; }
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#if defined(FASTLED_ARM) | defined(FASTLED_RISCV) | defined(FASTLED_APOLLO3)
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template<class T, int F, int I> static int operator*(int v, qfx<T,F,I> & q) { return q * v; }
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#endif
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/// A 4.4 integer (4 bits integer, 4 bits fraction)
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typedef qfx<uint8_t, 4,4> q44;
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/// A 6.2 integer (6 bits integer, 2 bits fraction)
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typedef qfx<uint8_t, 6,2> q62;
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/// A 8.8 integer (8 bits integer, 8 bits fraction)
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typedef qfx<uint16_t, 8,8> q88;
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/// A 12.4 integer (12 bits integer, 4 bits fraction)
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typedef qfx<uint16_t, 12,4> q124;
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/// @} FractionalTypes
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FASTLED_NAMESPACE_END
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