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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * HSLuv-C: Human-friendly HSL
+ *
+ * Authors:
+ *   2015 Alexei Boronine (original idea, JavaScript implementation)
+ *   2015 Roger Tallada (Obj-C implementation)
+ *   2017 Martin Mitas (C implementation, based on Obj-C implementation)
+ *   2021 Massinissa Derriche (C++ implementation for Inkscape, based on C implementation)
+ *
+ * Copyright (C) 2021 Authors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef SEEN_HSLUV_H
+#define SEEN_HSLUV_H
+
+#include <array>
+
+namespace Hsluv {
+
+// Types
+using Triplet = std::array<double, 3>;
+class Line {
+public:
+    Line ();
+    Line (double slope, double intercept);
+    Line (const Line& other);
+    void operator=(const Line& other);
+    double slope;
+    double intercept;
+};
+
+// Functions
+/**
+ * Return the bounds of the Luv colors in RGB gamut.
+ *
+ * @param l Lightness. Between 0.0 and 100.0.
+ * @return Bounds of Luv colors in RGB gamut.
+ */
+std::array<Line, 6> getBounds(double l);
+
+/**
+ * Convert Luv to RGB.
+ *
+ * @param l Luminance. Between 0.0 and 100.0.
+ * @param u U coordinate.
+ * @param v V coordinate.
+ * @param[out] pr Red. Between 0.0 and 1.0.
+ * @param[out] pg Green. Between 0.0 and 1.0.
+ * @param[out] pb Blue. Between 0.0 and 1.0.
+ */
+void luv_to_rgb(double l, double u, double v, double *pr, double *pg, double *pb);
+
+/**
+ * Convert HSLuv to Luv.
+ *
+ * @param h Hue. Between 0.0 and 360.0.
+ * @param s Saturation. Between 0.0 and 100.0.
+ * @param l Lightness. Between 0.0 and 100.0.
+ * @param[out] pl Luminance. Between 0.0 and 100.0.
+ * @param[out] pu U coordinate.
+ * @param[out] pv V coordinate.
+ */
+void hsluv_to_luv(double h, double s, double l, double *pl, double *pu, double *pv);
+
+/**
+ * Convert Luv to HSLuv.
+ *
+ * @param l Luminance. Between 0.0 and 100.0.
+ * @param u U coordinate.
+ * @param v V coordinate.
+ * @param[out] ph Hue. Between 0.0 and 360.0.
+ * @param[out] ps Saturation. Between 0.0 and 100.0.
+ * @param[out] pl Lightness. Between 0.0 and 100.0.
+ */
+void luv_to_hsluv(double l, double u, double v, double *ph, double *ps, double *pl);
+
+/**
+ * Convert RGB to HSLuv.
+ *
+ * @param r Red. Between 0.0 and 1.0.
+ * @param g Green. Between 0.0 and 1.0.
+ * @param b Blue. Between 0.0 and 1.0.
+ * @param[out] ph Hue. Between 0.0 and 360.0.
+ * @param[out] ps Saturation. Between 0.0 and 100.0.
+ * @param[out] pl Lightness. Between 0.0 and 100.0.
+ */
+void rgb_to_hsluv(double r, double g, double b, double *ph, double *ps, double *pl);
+
+/**
+ * Convert HSLuv to RGB.
+ *
+ * @param h Hue. Between 0.0 and 360.0.
+ * @param s Saturation. Between 0.0 and 100.0.
+ * @param l Lightness. Between 0.0 and 100.0.
+ * @param[out] pr Red. Between 0.0 and 1.0.
+ * @param[out] pg Green. Between 0.0 and 1.0.
+ * @param[out] pb Blue. Between 0.0 and 1.0.
+ */
+void hsluv_to_rgb(double h, double s, double l, double *pr, double *pg, double *pb);
+
+} // namespace Hsluv
+
+#endif  // SEEN_HSLUV_H