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62 lines
1.1 KiB
C++
62 lines
1.1 KiB
C++
#pragma once
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//
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// FILE: gamma.h
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// AUTHOR: Rob Tillaart
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// VERSION: 0.4.1
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// DATE: 2020-08-08
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// PURPOSE: Arduino Library to efficiently hold a gamma lookup table
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#include "Arduino.h"
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#define GAMMA_LIB_VERSION (F("0.4.1"))
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#define GAMMA_DEFAULT_SIZE 32
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#define GAMMA_MAX_SIZE 256
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class GAMMA
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{
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public:
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GAMMA(uint16_t size = GAMMA_DEFAULT_SIZE);
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~GAMMA();
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// allocates memory
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// sets default gamma = 2.8
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// Returns false if allocation fails
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bool begin();
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// CORE
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// Returns false if gamma <= 0
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bool setGamma(float gamma);
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float getGamma();
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// access values with index operator
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// index = 0 .. size
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uint8_t operator[] (uint8_t index);
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// META INFO
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uint16_t size();
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uint16_t distinct();
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// DEBUG
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bool dump(Stream *str = &Serial);
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bool dumpArray(Stream *str = &Serial);
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private:
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uint8_t _shift = 0;
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uint8_t _mask = 0;
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uint16_t _size = 0;
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uint8_t _interval = 0;
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float _gamma = 1.0; // 1.0 == no gamma, linear.
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uint8_t * _table = NULL;
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float fastPow(float a, float b);
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};
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// -- END OF FILE --
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