From 9fcc0029ec7bc8c10bc318fc5828c4b5a2efd461 Mon Sep 17 00:00:00 2001
From: Paul Elder <paul.elder@ideasonboard.com>
Date: Fri, 29 Mar 2024 21:44:29 +0900
Subject: ipa: rpi: controller: Use libipa's Pwl class

To reduce code duplication, use the Pwl class from libipa. This also
removes the Pwl class from the Raspberry Pi IPA.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Stefan Klug <stefan.klug@ideasonboard.com>
Acked-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
---
 src/ipa/rpi/controller/pwl.h | 127 -------------------------------------------
 1 file changed, 127 deletions(-)
 delete mode 100644 src/ipa/rpi/controller/pwl.h

(limited to 'src/ipa/rpi/controller/pwl.h')

diff --git a/src/ipa/rpi/controller/pwl.h b/src/ipa/rpi/controller/pwl.h
deleted file mode 100644
index 7d5e7e4d..00000000
--- a/src/ipa/rpi/controller/pwl.h
+++ /dev/null
@@ -1,127 +0,0 @@
-/* SPDX-License-Identifier: BSD-2-Clause */
-/*
- * Copyright (C) 2019, Raspberry Pi Ltd
- *
- * piecewise linear functions interface
- */
-#pragma once
-
-#include <functional>
-#include <math.h>
-#include <vector>
-
-#include "libcamera/internal/yaml_parser.h"
-
-namespace RPiController {
-
-class Pwl
-{
-public:
-	struct Interval {
-		Interval(double _start, double _end)
-			: start(_start), end(_end)
-		{
-		}
-		double start, end;
-		bool contains(double value)
-		{
-			return value >= start && value <= end;
-		}
-		double clip(double value)
-		{
-			return value < start ? start
-					     : (value > end ? end : value);
-		}
-		double len() const { return end - start; }
-	};
-	struct Point {
-		Point() : x(0), y(0) {}
-		Point(double _x, double _y)
-			: x(_x), y(_y) {}
-		double x, y;
-		Point operator-(Point const &p) const
-		{
-			return Point(x - p.x, y - p.y);
-		}
-		Point operator+(Point const &p) const
-		{
-			return Point(x + p.x, y + p.y);
-		}
-		double operator%(Point const &p) const
-		{
-			return x * p.x + y * p.y;
-		}
-		Point operator*(double f) const { return Point(x * f, y * f); }
-		Point operator/(double f) const { return Point(x / f, y / f); }
-		double len2() const { return x * x + y * y; }
-		double len() const { return sqrt(len2()); }
-	};
-	Pwl() {}
-	Pwl(std::vector<Point> const &points) : points_(points) {}
-	int read(const libcamera::YamlObject &params);
-	void append(double x, double y, const double eps = 1e-6);
-	void prepend(double x, double y, const double eps = 1e-6);
-	Interval domain() const;
-	Interval range() const;
-	bool empty() const;
-	/*
-	 * Evaluate Pwl, optionally supplying an initial guess for the
-	 * "span". The "span" may be optionally be updated.  If you want to know
-	 * the "span" value but don't have an initial guess you can set it to
-	 * -1.
-	 */
-	double eval(double x, int *spanPtr = nullptr,
-		    bool updateSpan = true) const;
-	/*
-	 * Find perpendicular closest to xy, starting from span+1 so you can
-	 * call it repeatedly to check for multiple closest points (set span to
-	 * -1 on the first call). Also returns "pseudo" perpendiculars; see
-	 * PerpType enum.
-	 */
-	enum class PerpType {
-		None, /* no perpendicular found */
-		Start, /* start of Pwl is closest point */
-		End, /* end of Pwl is closest point */
-		Vertex, /* vertex of Pwl is closest point */
-		Perpendicular /* true perpendicular found */
-	};
-	PerpType invert(Point const &xy, Point &perp, int &span,
-			const double eps = 1e-6) const;
-	/*
-	 * Compute the inverse function. Indicate if it is a proper (true)
-	 * inverse, or only a best effort (e.g. input was non-monotonic).
-	 */
-	Pwl inverse(bool *trueInverse = nullptr, const double eps = 1e-6) const;
-	/* Compose two Pwls together, doing "this" first and "other" after. */
-	Pwl compose(Pwl const &other, const double eps = 1e-6) const;
-	/* Apply function to (x,y) values at every control point. */
-	void map(std::function<void(double x, double y)> f) const;
-	/*
-	 * Apply function to (x, y0, y1) values wherever either Pwl has a
-	 * control point.
-	 */
-	static void map2(Pwl const &pwl0, Pwl const &pwl1,
-			 std::function<void(double x, double y0, double y1)> f);
-	/*
-	 * Combine two Pwls, meaning we create a new Pwl where the y values are
-	 * given by running f wherever either has a knot.
-	 */
-	static Pwl
-	combine(Pwl const &pwl0, Pwl const &pwl1,
-		std::function<double(double x, double y0, double y1)> f,
-		const double eps = 1e-6);
-	/*
-	 * Make "this" match (at least) the given domain. Any extension my be
-	 * clipped or linear.
-	 */
-	void matchDomain(Interval const &domain, bool clip = true,
-			 const double eps = 1e-6);
-	Pwl &operator*=(double d);
-	void debug(FILE *fp = stdout) const;
-
-private:
-	int findSpan(double x, int span) const;
-	std::vector<Point> points_;
-};
-
-} /* namespace RPiController */
-- 
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