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diff --git a/src/live_effects/fill-conversion.h b/src/live_effects/fill-conversion.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef INKSCAPE_FILLCONVERSION_H
+#define INKSCAPE_FILLCONVERSION_H
+
+/*
+ * Copyright (C) Liam P White 2020
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+class SPShape;
+
+namespace Inkscape {
+namespace LivePathEffect {
+
+/**
+ * Prepares a SPShape's fill and stroke for use in a path effect by setting
+ * the existing stroke properties into the shape's fill, and setting the
+ * existing fill properties into a new linked fill item which follows the
+ * old shape.
+ */
+void lpe_shape_convert_stroke_and_fill(SPShape *shape);
+
+/**
+ * Applies the fill of the SPShape to its stroke, sets the stroke width to the
+ * provided parameter, and potentially removes a linked fill, copying its
+ * properties to the fill of the shape. Essentially undoes the result of the
+ * above function.
+ */
+void lpe_shape_revert_stroke_and_fill(SPShape *shape, double width);
+
+}
+}
+
+#endif
+
+/*
+  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 :