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diff --git a/src/helper/geom-pathstroke.h b/src/helper/geom-pathstroke.h
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+++ b/src/helper/geom-pathstroke.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef INKSCAPE_HELPER_PATH_STROKE_H
+#define INKSCAPE_HELPER_PATH_STROKE_H
+
+/* Authors:
+ *   Liam P. White
+ *   Tavmjong Bah
+ *
+ * Copyright (C) 2014-2015 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <2geom/path.h>
+#include <2geom/pathvector.h>
+
+namespace Inkscape {
+
+enum LineJoinType {
+    JOIN_BEVEL,
+    JOIN_ROUND,
+    JOIN_MITER,
+    JOIN_MITER_CLIP,
+    JOIN_EXTRAPOLATE,
+    JOIN_EXTRAPOLATE1,
+    JOIN_EXTRAPOLATE2,
+    JOIN_EXTRAPOLATE3,
+};
+
+enum LineCapType {
+    BUTT_FLAT,
+    BUTT_ROUND,
+    BUTT_SQUARE,
+    BUTT_PEAK, // This is not a line ending supported by the SVG standard.
+};
+
+/**
+ * Strokes the path given by @a input.
+ * Joins may behave oddly if the width is negative.
+ *
+ * @param[in] input Input path.
+ * @param[in] width Stroke width.
+ * @param[in] miter Miter limit. Only used when @a join is one of JOIN_MITER, JOIN_MITER_CLIP, and JOIN_EXTRAPOLATE.
+ * @param[in] join  Line join type used during offset. Member of LineJoinType enum.
+ * @param[in] cap   Line cap type used during stroking. Member of LineCapType enum.
+ * @param[in] tolerance Tolerance, values smaller than 0 lead to automatic tolerance depending on width.
+ *
+ * @return Stroked path.
+ *         If the input path is closed, the resultant vector will contain two paths.
+ *         Otherwise, there should be only one in the output.
+ */
+Geom::PathVector outline(
+        Geom::Path const& input,
+        double width,
+        double miter,
+        LineJoinType join = JOIN_BEVEL,
+        LineCapType cap = BUTT_FLAT,
+        double tolerance = -1);
+
+/**
+ * Offset the input path by @a width.
+ * Joins may behave oddly if the width is negative.
+ *
+ * @param[in] input Input path.
+ * @param[in] width Amount to offset.
+ * @param[in] miter Miter limit. Only used when @a join is one of JOIN_MITER, JOIN_MITER_CLIP, and JOIN_EXTRAPOLATE.
+ * @param[in] join  Line join type used during offset. Member of LineJoinType enum.
+ * @param[in] tolerance Tolerance, values smaller than 0 lead to automatic tolerance depending on width.
+ *
+ * @return Offsetted output.
+ */
+Geom::Path half_outline(
+        Geom::Path const& input,
+        double width,
+        double miter,
+        LineJoinType join = JOIN_BEVEL,
+        double tolerance = -1);
+
+/**
+ * Builds a join on the provided path.
+ * Joins may behave oddly if the width is negative.
+ *
+ * @param[inout] res      The path to build the join on. 
+ *                        The outgoing path (or a portion thereof) will be appended after the join is created.
+ *                        Previous segments may be modified as an optimization, beware!
+ *
+ * @param[in]    outgoing The segment to append on the outgoing portion of the join.
+ * @param[in]    in_tang  The end tangent to consider on the input path.
+ * @param[in]    out_tang The begin tangent to consider on the output path.
+ * @param[in]    width
+ * @param[in]    miter
+ * @param[in]    join
+ */
+void outline_join(Geom::Path &res, Geom::Path const& outgoing, Geom::Point in_tang, Geom::Point out_tang, double width, double miter, LineJoinType join);
+
+} // namespace Inkscape
+
+#endif // INKSCAPE_HELPER_PATH_STROKE_H
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8 :