113 lines
2.2 KiB
C++
113 lines
2.2 KiB
C++
#ifndef _MYMATH_
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#define _MYMATH_
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#include <cmath>
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#include <algorithm>
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namespace rtengine
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{
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static const int MAXVAL = 0xffff;
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static const float MAXVALF = float(MAXVAL); // float version of MAXVAL
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static const double MAXVALD = double(MAXVAL); // double version of MAXVAL
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template <typename _Tp>
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inline _Tp SQR (_Tp x)
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{
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// return std::pow(x,2); Slower than:
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return x * x;
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}
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template<typename _Tp>
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inline const _Tp& min(const _Tp& a, const _Tp& b)
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{
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return std::min(a, b);
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}
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template<typename _Tp>
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inline const _Tp& max(const _Tp& a, const _Tp& b)
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{
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return std::max(a, b);
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}
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template<typename _Tp>
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inline const _Tp& LIM(const _Tp& a, const _Tp& b, const _Tp& c)
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{
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return std::max(b, std::min(a, c));
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}
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template<typename _Tp>
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inline _Tp LIM01(const _Tp& a)
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{
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return std::max(_Tp(0), std::min(a, _Tp(1)));
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}
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template<typename _Tp>
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inline _Tp CLIP(const _Tp& a)
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{
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return LIM(a, static_cast<_Tp>(0), static_cast<_Tp>(MAXVAL));
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}
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template<typename _Tp>
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inline const _Tp& min(const _Tp& a, const _Tp& b, const _Tp& c)
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{
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return std::min(c, std::min(a, b));
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}
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template<typename _Tp>
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inline const _Tp& max(const _Tp& a, const _Tp& b, const _Tp& c)
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{
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return std::max(c, std::max(a, b));
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}
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template<typename _Tp>
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inline const _Tp& min(const _Tp& a, const _Tp& b, const _Tp& c, const _Tp& d)
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{
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return std::min(d, std::min(c, std::min(a, b)));
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}
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template<typename _Tp>
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inline const _Tp& max(const _Tp& a, const _Tp& b, const _Tp& c, const _Tp& d)
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{
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return std::max(d, std::max(c, std::max(a, b)));
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}
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template<typename _Tp>
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inline _Tp intp(_Tp a, _Tp b, _Tp c)
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{
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// calculate a * b + (1 - a) * c
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// following is valid:
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// intp(a, b+x, c+x) = intp(a, b, c) + x
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// intp(a, b*x, c*x) = intp(a, b, c) * x
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return a * (b - c) + c;
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}
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template<typename T>
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inline T norm1(const T& x, const T& y)
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{
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return std::abs(x) + std::abs(y);
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}
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template<typename T>
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inline T norm2(const T& x, const T& y)
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{
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return std::sqrt(x * x + y * y);
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}
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template< typename T >
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inline T norminf(const T& x, const T& y)
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{
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return std::max(std::abs(x), std::abs(y));
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}
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inline int float2uint16range(float d) // clips input to [0;65535] and rounds
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{
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d = CLIP(d); // clip to [0;65535]
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return d + 0.5f;
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}
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}
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#endif
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