Stefan Klug
3acacb089d
Sometimes it is necessary to clear a pwl. Add a function for that. Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com> Reviewed-by: Paul Elder <paul.elder@ideasonboard.com> Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>
87 lines
1.7 KiB
C++
87 lines
1.7 KiB
C++
/* SPDX-License-Identifier: BSD-2-Clause */
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/*
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* Copyright (C) 2019, Raspberry Pi Ltd
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*
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* Piecewise linear functions interface
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*/
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#pragma once
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#include <algorithm>
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#include <functional>
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#include <string>
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#include <utility>
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#include <vector>
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#include "libcamera/internal/vector.h"
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namespace libcamera {
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namespace ipa {
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class Pwl
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{
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public:
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using Point = Vector<double, 2>;
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struct Interval {
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Interval(double _start, double _end)
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: start(_start), end(_end) {}
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bool contains(double value)
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{
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return value >= start && value <= end;
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}
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double clamp(double value)
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{
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return std::clamp(value, start, end);
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}
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double length() const { return end - start; }
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double start, end;
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};
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Pwl();
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Pwl(const std::vector<Point> &points);
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Pwl(std::vector<Point> &&points);
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void append(double x, double y, double eps = 1e-6);
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bool empty() const { return points_.empty(); }
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void clear() { points_.clear(); }
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size_t size() const { return points_.size(); }
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Interval domain() const;
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Interval range() const;
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double eval(double x, int *span = nullptr,
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bool updateSpan = true) const;
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std::pair<Pwl, bool> inverse(double eps = 1e-6) const;
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Pwl compose(const Pwl &other, double eps = 1e-6) const;
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void map(std::function<void(double x, double y)> f) const;
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static Pwl
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combine(const Pwl &pwl0, const Pwl &pwl1,
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std::function<double(double x, double y0, double y1)> f,
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double eps = 1e-6);
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Pwl &operator*=(double d);
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std::string toString() const;
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private:
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static void map2(const Pwl &pwl0, const Pwl &pwl1,
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std::function<void(double x, double y0, double y1)> f);
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void prepend(double x, double y, double eps = 1e-6);
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int findSpan(double x, int span) const;
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std::vector<Point> points_;
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};
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} /* namespace ipa */
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} /* namespace libcamera */
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