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80 lines
3.1 KiB
80 lines
3.1 KiB
/*
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* Copyright (c) 2011-2015, Intel Corporation
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "LinearParameterAdaptation.h"
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#include <cmath>
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#include <limits>
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/**
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* This class is used to perform a logarithmic adapation of type:
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* (slopeNumerator / slopeDenominator) * log(parameter) + offset
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* Since log(x) == -INFINITY , we can define FloorValue as a
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* x -> 0
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* a lower bound limit for the adaptation
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*/
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class CLogarithmicParameterAdaptation : public CLinearParameterAdaptation
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{
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public:
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CLogarithmicParameterAdaptation();
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/**
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* Conversions must satisfy the following: f(f'(a)) = a
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* Let f=fromUserValue and f'=toUserValue
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* if y = f(log(x)/log(base)), then
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* f'(y) * log(base) = log (x)
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* exp(f'(y)*log(base)) = x
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*/
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int64_t fromUserValue(double dValue) const override;
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double toUserValue(int64_t iValue) const override;
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void showProperties(std::string &strResult) const override;
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bool fromXml(const CXmlElement &xmlElement,
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CXmlSerializingContext &serializingContext) override;
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private:
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/**
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* _dLogarithmBase characterizes the new logarithm logB(x) with
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* the following property: logB(x) = log(x) / log(_dLogarithmBase).
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* log being the base-e logarithm.
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*
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* std::exp(1) == e^1 == e == natural logarithm base
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* Make sure there is no precision lose by using std::exp overload that
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* return the same type as _dLogarithmBase
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*/
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double _dLogarithmBase{std::exp(decltype(_dLogarithmBase){1})};
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/**
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* _dFloorValue reflects the lower bound for volume attenuation
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*/
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double _dFloorValue{-std::numeric_limits<double>::infinity()};
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};
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