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diff --git a/src/display/nr-filter-slot.h b/src/display/nr-filter-slot.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef SEEN_NR_FILTER_SLOT_H
+#define SEEN_NR_FILTER_SLOT_H
+
+/*
+ * A container class for filter slots. Allows for simple getting and
+ * setting images in filter slots without having to bother with
+ * table indexes and such.
+ *
+ * Author:
+ *   Niko Kiirala <niko@kiirala.com>
+ *
+ * Copyright (C) 2006,2007 Niko Kiirala
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <map>
+#include "display/nr-filter-types.h"
+#include "display/nr-filter-units.h"
+
+extern "C" {
+typedef struct _cairo cairo_t;
+typedef struct _cairo_surface cairo_surface_t;
+}
+
+namespace Inkscape {
+class DrawingContext;
+class DrawingItem;
+
+namespace Filters {
+
+class FilterSlot {
+public:
+    /** Creates a new FilterSlot object. */
+    FilterSlot(DrawingItem *item, DrawingContext *bgdc,
+        DrawingContext &graphic, FilterUnits const &u);
+    /** Destroys the FilterSlot object and all its contents */
+    virtual ~FilterSlot();
+
+    /** Returns the pixblock in specified slot.
+     * Parameter 'slot' may be either an positive integer or one of
+     * pre-defined filter slot types: NR_FILTER_SLOT_NOT_SET,
+     * NR_FILTER_SOURCEGRAPHIC, NR_FILTER_SOURCEALPHA,
+     * NR_FILTER_BACKGROUNDIMAGE, NR_FILTER_BACKGROUNDALPHA,
+     * NR_FILTER_FILLPAINT, NR_FILTER_SOURCEPAINT.
+     */
+    cairo_surface_t *getcairo(int slot);
+
+    /** Sets or re-sets the pixblock associated with given slot.
+     * If there was a pixblock already assigned with this slot,
+     * that pixblock is destroyed.
+     */
+    void set(int slot, cairo_surface_t *s);
+
+    cairo_surface_t *get_result(int slot_nr);
+
+    void set_primitive_area(int slot, Geom::Rect &area);
+    Geom::Rect get_primitive_area(int slot);
+    
+    /** Returns the number of slots in use. */
+    int get_slot_count();
+
+    /** Sets the unit system to be used for the internal images. */
+    //void set_units(FilterUnits const &units);
+
+    /** Sets the filtering quality. Affects used interpolation methods */
+    void set_quality(FilterQuality const q);
+
+    /** Sets the gaussian filtering quality. Affects used interpolation methods */
+    void set_blurquality(int const q);
+
+    /** Gets the gaussian filtering quality. Affects used interpolation methods */
+    int get_blurquality();
+
+    /** Sets the device scale; for high DPI monitors. */
+    void set_device_scale(int const s);
+
+    /** Gets the device scale; for high DPI monitors. */
+    int get_device_scale();
+
+    FilterUnits const &get_units() const { return _units; }
+    Geom::Rect get_slot_area() const;
+
+private:
+    typedef std::map<int, cairo_surface_t *> SlotMap;
+    SlotMap _slots;
+
+    // We need to keep track of the primitive area as this is needed in feTile
+    typedef std::map<int, Geom::Rect> PrimitiveAreaMap;
+    PrimitiveAreaMap _primitiveAreas;
+
+    DrawingItem *_item;
+
+    //Geom::Rect _source_bbox; ///< bounding box of source graphic surface
+    //Geom::Rect _intermediate_bbox; ///< bounding box of intermediate surfaces
+
+    int _slot_w, _slot_h;
+    double _slot_x, _slot_y;
+    cairo_surface_t *_source_graphic;
+    cairo_t *_background_ct;
+    Geom::IntRect _source_graphic_area;
+    Geom::IntRect _background_area; ///< needed to extract background
+    FilterUnits const &_units;
+    int _last_out;
+    FilterQuality filterquality;
+    int blurquality;
+    int device_scale;
+
+    cairo_surface_t *_get_transformed_source_graphic();
+    cairo_surface_t *_get_transformed_background();
+    cairo_surface_t *_get_fill_paint();
+    cairo_surface_t *_get_stroke_paint();
+
+    void _set_internal(int slot, cairo_surface_t *s);
+};
+
+} /* namespace Filters */
+} /* namespace Inkscape */
+
+#endif // __NR_FILTER_SLOT_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 :