76 lines
1.6 KiB
C++
76 lines
1.6 KiB
C++
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// fbc_cv is free software and uses the same licence as OpenCV
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// Email: fengbingchun@163.com
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#ifndef FBC_CV_CORE_FAST_MATH_HPP_
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#define FBC_CV_CORE_FAST_MATH_HPP_
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// reference: include/opencv2/core/fast_math.hpp
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#include "fbcdef.hpp"
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namespace yt_tinycv {
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// Rounds floating-point number to the nearest integer
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static inline int fbcRound(double value)
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{
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// it's ok if round does not comply with IEEE754 standard;
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// it should allow +/-1 difference when the other functions use round
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return (int)(value + (value >= 0 ? 0.5 : -0.5));
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}
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static inline int fbcRound(float value)
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{
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// it's ok if round does not comply with IEEE754 standard;
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// it should allow +/-1 difference when the other functions use round
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return (int)(value + (value >= 0 ? 0.5f : -0.5f));
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}
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static inline int fbcRound(int value)
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{
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return value;
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}
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// Rounds floating-point number to the nearest integer not larger than the original
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static inline int fbcFloor(double value)
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{
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int i = fbcRound(value);
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float diff = (float)(value - i);
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return i - (diff < 0);
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}
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static inline int fbcFloor(float value)
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{
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int i = fbcRound(value);
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float diff = (float)(value - i);
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return i - (diff < 0);
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}
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static inline int fbcFloor(int value)
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{
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return value;
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}
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// Rounds floating-point number to the nearest integer not smaller than the original
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static inline int fbcCeil(double value)
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{
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int i = fbcRound(value);
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float diff = (float)(i - value);
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return i + (diff < 0);
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}
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static inline int fbcCeil(float value)
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{
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int i = fbcRound(value);
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float diff = (float)(i - value);
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return i + (diff < 0);
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}
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static inline int fbcCeil(int value)
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{
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return value;
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}
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} // yt_tinycv
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#endif // FBC_CV_CORE_FAST_MATH_HPP_
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