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80 lines
2.1 KiB
C++
80 lines
2.1 KiB
C++
#pragma once
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// STL includes
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#include <cstdint>
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/// Transform for a single color byte value
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///
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/// Transforms are applied in the following order:
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/// 1) a threshold is applied. All values below threshold will be set to zero
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/// 2) gamma color correction is applied
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/// 3) the output value is scaled from the [0:1] to [blacklevel:whitelevel]
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/// 4) finally, in case of a weird choice of parameters, the output is clamped between [0:1]
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///
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/// All configuration values are doubles and assume the color value to be between 0 and 1
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class RgbChannelTransform
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{
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public:
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/// Default constructor
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RgbChannelTransform();
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/// Constructor
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/// @param threshold The minimum threshold
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/// @param gamma The gamma of the gamma-curve correction
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/// @param blacklevel The minimum value for the RGB-Channel
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/// @param whitelevel The maximum value for the RGB-Channel
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RgbChannelTransform(double threshold, double gamma, double blacklevel, double whitelevel);
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/// Destructor
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~RgbChannelTransform();
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/// @return The current threshold value
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double getThreshold() const;
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/// @param threshold New threshold value
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void setThreshold(double threshold);
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/// @return The current gamma value
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double getGamma() const;
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/// @param gamma New gamma value
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void setGamma(double gamma);
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/// @return The current blacklevel value
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double getBlacklevel() const;
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/// @param blacklevel New blacklevel value
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void setBlacklevel(double blacklevel);
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/// @return The current whitelevel value
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double getWhitelevel() const;
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/// @param whitelevel New whitelevel value
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void setWhitelevel(double whitelevel);
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/// Transform the given byte value
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/// @param input The input color byte
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/// @return The transformed byte value
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uint8_t transform(uint8_t input) const
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{
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return _mapping[input];
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}
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private:
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/// (re)-initilize the color mapping
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void initializeMapping();
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private:
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/// The threshold value
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double _threshold;
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/// The gamma value
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double _gamma;
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/// The blacklevel
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double _blacklevel;
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/// The whitelevel
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double _whitelevel;
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/// The mapping from input color to output color
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uint8_t _mapping[256];
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};
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