109 lines
3.2 KiB
C
109 lines
3.2 KiB
C
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///\file
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/******************************************************************************
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The MIT License(MIT)
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Embedded Template Library.
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https://github.com/ETLCPP/etl
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https://www.etlcpp.com
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Copyright(c) 2021 John Wellbelove
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files(the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions :
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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******************************************************************************/
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#ifndef ETL_GAMMA_INCLUDED
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#define ETL_GAMMA_INCLUDED
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#include "platform.h"
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#include "functional.h"
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#include "type_traits.h"
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#include <math.h>
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#include <stdint.h>
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namespace etl
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{
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//***************************************************************************
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/// Gamma encode function.
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//***************************************************************************
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template <typename TInput>
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class gamma_encode : public etl::unary_function<TInput, TInput>
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{
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public:
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//*********************************
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/// Constructor.
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//*********************************
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gamma_encode(double gamma_, TInput maximum_)
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: one_over_gamma(1.0 / gamma_)
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, maximum(maximum_)
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{
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}
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//*********************************
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/// operator ()
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/// Get the gamma.
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//*********************************
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TInput operator ()(TInput value) const
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{
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return TInput(TInput(maximum * pow(double(value) / maximum, one_over_gamma)));
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}
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private:
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const double one_over_gamma;
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const double maximum;
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};
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//***************************************************************************
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/// Gamma decode function.
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//***************************************************************************
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template <typename TInput>
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class gamma_decode : public etl::unary_function<TInput, TInput>
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{
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public:
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//*********************************
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/// Constructor.
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//*********************************
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gamma_decode(double gamma_, TInput maximum_)
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: gamma(gamma_)
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, maximum(maximum_)
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{
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}
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//*********************************
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/// operator ()
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/// Get the gamma.
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//*********************************
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TInput operator ()(TInput value) const
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{
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return TInput(TInput(maximum * pow(double(value) / maximum, gamma)));
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}
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private:
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const double gamma;
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const double maximum;
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};
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}
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#endif
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