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diff --git a/src/gradient-chemistry.h b/src/gradient-chemistry.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef SEEN_SP_GRADIENT_CHEMISTRY_H
+#define SEEN_SP_GRADIENT_CHEMISTRY_H
+
+/*
+ * Various utility methods for gradients
+ *
+ * Author:
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *   bulia byak <buliabyak@users.sf.net>
+ *   Johan Engelen <j.b.c.engelen@ewi.utwente.nl>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 2010 Authors
+ * Copyright (C) 2007 Johan Engelen
+ * Copyright (C) 2001-2002 Lauris Kaplinski
+ * Copyright (C) 2001 Ximian, Inc.
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "object/sp-gradient.h"
+
+class SPCSSAttr;
+class SPItem;
+class SPGradient;
+class SPDesktop;
+
+
+/**
+ * Either normalizes given gradient to vector, or returns fresh normalized
+ * vector - in latter case, original gradient is flattened and stops cleared.
+ * No transrefing - i.e. caller shouldn't hold reference to original and
+ * does not get one to new automatically (doc holds ref of every object anyways)
+ */
+SPGradient *sp_gradient_ensure_vector_normalized(SPGradient *gradient);
+
+ 
+/**
+ * Sets item fill or stroke to the gradient of the specified type with given vector, creating
+ * new private gradient, if needed.
+ * gr has to be a normalized vector.
+ */
+SPGradient *sp_item_set_gradient(SPItem *item, SPGradient *gr, SPGradientType type, Inkscape::PaintTarget fill_or_stroke);
+
+/*
+ * Get default normalized gradient vector of document, create if there is none
+ */
+SPGradient *sp_document_default_gradient_vector( SPDocument *document, SPColor const &color, bool singleStop );
+
+/**
+ * Return the preferred vector for \a o, made from (in order of preference) its current vector,
+ * current fill or stroke color, or from desktop style if \a o is NULL or doesn't have style.
+ */
+SPGradient *sp_gradient_vector_for_object( SPDocument *doc, SPDesktop *desktop, SPObject *o, Inkscape::PaintTarget fill_or_stroke, bool singleStop = false );
+
+void sp_object_ensure_fill_gradient_normalized (SPObject *object);
+void sp_object_ensure_stroke_gradient_normalized (SPObject *object);
+
+SPGradient *sp_gradient_convert_to_userspace (SPGradient *gr, SPItem *item, const char *property);
+SPGradient *sp_gradient_reset_to_userspace (SPGradient *gr, SPItem *item);
+
+SPGradient *sp_gradient_fork_vector_if_necessary (SPGradient *gr);
+SPGradient *sp_gradient_get_forked_vector_if_necessary(SPGradient *gradient, bool force_vector);
+
+
+SPStop* sp_last_stop(SPGradient *gradient);
+SPStop* sp_get_stop_i(SPGradient *gradient, unsigned int i);
+// return n-th stop counting from 0; make no assumptions about offsets 
+SPStop* sp_get_nth_stop(SPGradient* gradient, unsigned int index);
+std::pair<SPStop*, SPStop*> sp_get_before_after_stops(SPStop* stop);
+unsigned int sp_number_of_stops(SPGradient const *gradient);
+unsigned int sp_number_of_stops_before_stop(SPGradient* gradient, SPStop *target);
+
+guint32 average_color(guint32 c1, guint32 c2, double p = 0.5);
+
+SPStop *sp_vector_add_stop(SPGradient *vector, SPStop* prev_stop, SPStop* next_stop, gfloat offset);
+
+void sp_gradient_delete_stop(SPGradient* gradient, SPStop* stop);
+SPStop* sp_gradient_add_stop(SPGradient* gradient, SPStop* current);
+SPStop* sp_gradient_add_stop_at(SPGradient* gradient, double offset);
+void sp_set_gradient_stop_color(SPDocument* document, SPStop* stop, SPColor color, double opacity);
+
+void sp_gradient_transform_multiply(SPGradient *gradient, Geom::Affine postmul, bool set);
+
+void sp_gradient_reverse_selected_gradients(SPDesktop *desktop);
+
+void sp_gradient_invert_selected_gradients(SPDesktop *desktop, Inkscape::PaintTarget fill_or_stroke);
+
+void sp_gradient_unset_swatch(SPDesktop *desktop, std::string const &id);
+
+SPGradient* sp_item_get_gradient(SPItem *item, bool fillorstroke);
+
+std::vector<SPItem*> sp_get_all_document_items(SPDocument* document);
+
+int sp_get_gradient_refcount(SPDocument* document, SPGradient* gradient);
+
+void sp_gradient_reverse_vector(SPGradient* gradient);
+
+/**
+ * Fetches either the fill or the stroke gradient from the given item.
+ *
+ * @param fill_or_stroke the gradient type (fill/stroke) to get.
+ * @return the specified gradient if set, null otherwise.
+ */
+SPGradient *getGradient(SPItem *item, Inkscape::PaintTarget fill_or_stroke);
+
+
+void sp_item_gradient_set_coords(SPItem *item, GrPointType point_type, unsigned int point_i, Geom::Point p_desk, Inkscape::PaintTarget fill_or_stroke, bool write_repr, bool scale);
+
+/**
+ * Returns the position of point point_type of the gradient applied to item (either fill_or_stroke),
+ * in desktop coordinates.
+*/
+Geom::Point getGradientCoords(SPItem *item, GrPointType point_type, unsigned int point_i, Inkscape::PaintTarget fill_or_stroke);
+
+SPGradient *sp_item_gradient_get_vector(SPItem *item, Inkscape::PaintTarget fill_or_stroke);
+SPGradientSpread sp_item_gradient_get_spread(SPItem *item, Inkscape::PaintTarget fill_or_stroke);
+
+SPStop* sp_item_gradient_get_stop(SPItem *item, GrPointType point_type, guint point_i, Inkscape::PaintTarget fill_or_stroke);
+
+void sp_item_gradient_stop_set_style(SPItem *item, GrPointType point_type, unsigned int point_i, Inkscape::PaintTarget fill_or_stroke, SPCSSAttr *stop);
+guint32 sp_item_gradient_stop_query_style(SPItem *item, GrPointType point_type, unsigned int point_i, Inkscape::PaintTarget fill_or_stroke);
+void sp_item_gradient_reverse_vector(SPItem *item, Inkscape::PaintTarget fill_or_stroke);
+void sp_item_gradient_invert_vector_color(SPItem *item, Inkscape::PaintTarget fill_or_stroke);
+
+#endif // SEEN_SP_GRADIENT_CHEMISTRY_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:textwidth=99 :