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diff --git a/src/display/nr-filter-gaussian.h b/src/display/nr-filter-gaussian.h
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+++ b/src/display/nr-filter-gaussian.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef SEEN_NR_FILTER_GAUSSIAN_H
+#define SEEN_NR_FILTER_GAUSSIAN_H
+
+/*
+ * Gaussian blur renderer
+ *
+ * Authors:
+ *   Niko Kiirala <niko@kiirala.com>
+ *   bulia byak
+ *   Jasper van de Gronde <th.v.d.gronde@hccnet.nl>
+ *
+ * Copyright (C) 2006 authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <2geom/forward.h>
+#include "display/nr-filter-primitive.h"
+
+enum {
+    BLUR_QUALITY_BEST = 2,
+    BLUR_QUALITY_BETTER = 1,
+    BLUR_QUALITY_NORMAL = 0,
+    BLUR_QUALITY_WORSE = -1,
+    BLUR_QUALITY_WORST = -2
+};
+
+namespace Inkscape {
+namespace Filters {
+
+class FilterGaussian : public FilterPrimitive {
+public:
+    FilterGaussian();
+    static FilterPrimitive *create();
+    ~FilterGaussian() override;
+
+    void render_cairo(FilterSlot &slot) override;
+    void area_enlarge(Geom::IntRect &area, Geom::Affine const &m) override;
+    bool can_handle_affine(Geom::Affine const &m) override;
+    double complexity(Geom::Affine const &ctm) override;
+
+    /**
+     * Set the standard deviation value for gaussian blur. Deviation along
+     * both axis is set to the provided value.
+     * Negative value, NaN and infinity are considered an error and no
+     * changes to filter state are made. If not set, default value of zero
+     * is used, which means the filter results in transparent black image.
+     */
+    void set_deviation(double deviation);
+    /**
+     * Set the standard deviation value for gaussian blur. First parameter
+     * sets the deviation alogn x-axis, second along y-axis.
+     * Negative value, NaN and infinity are considered an error and no
+     * changes to filter state are made. If not set, default value of zero
+     * is used, which means the filter results in transparent black image.
+     */
+    void set_deviation(double x, double y);
+
+    Glib::ustring name() override { return Glib::ustring("Gaussian Blur"); }
+
+private:
+    double _deviation_x;
+    double _deviation_y;
+};
+
+
+} /* namespace Filters */
+} /* namespace Inkscape */
+
+
+
+
+#endif /* __NR_FILTER_GAUSSIAN_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 :