hyperion.ng/include/utils/RgbTransform.h

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#pragma once
// STL includes
#include <cstdint>
///
/// Color transformation to adjust the saturation and value of a RGB color value
///
class RgbTransform
{
public:
///
/// Default constructor
///
RgbTransform();
///
/// Constructor
///
/// @param gammaR The used red gamma
/// @param gammaG The used green gamma
/// @param gammab The used blue gamma
/// @param brightnessLow The used lower brightness
/// @param brightnessHigh The used higher brightness
///
RgbTransform(double gammaR, double gammaG, double gammaB, double brightnessLow, double brightnessHigh);
///
/// Destructor
///
~RgbTransform();
/// @return The current red gamma value
double getGammaR() const;
/// @return The current green gamma value
double getGammaG() const;
/// @return The current blue gamma value
double getGammaB() const;
/// @param gamma New gamma value
void setGamma(double gammaR,double gammaG=-1, double gammaB=-1);
/// @return The current lower brightness
double getBrightnessMin() const;
/// @param gamma New lower brightness
void setBrightnessMin(double brightness);
/// @return The current lower brightness
double getBrightness() const;
/// @param gamma New lower brightness
void setBrightness(double brightness);
///
/// Apply the transform the the given RGB values.
///
/// @param red The red color component
/// @param green The green color component
/// @param blue The blue color component
///
/// @note The values are updated in place.
///
void transform(uint8_t & red, uint8_t & green, uint8_t & blue);
private:
///
/// init
///
/// @param gammaR The used red gamma
/// @param gammaG The used green gamma
/// @param gammab The used blue gamma
/// @param brightnessLow The used lower brightness
/// @param brightnessHigh The used higher brightness
///
void init(double gammaR, double gammaG, double gammaB, double brightnessLow, double brightnessHigh);
/// (re)-initilize the color mapping
void initializeMapping(); /// The saturation gain
double _brightnessLow;
double _brightnessHigh;
double _sumBrightnessLow;
double _sumBrightnessHigh;
double _gammaR;
double _gammaG;
double _gammaB;
/// The mapping from input color to output color
uint8_t _mappingR[256];
uint8_t _mappingG[256];
uint8_t _mappingB[256];
};