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diff --git a/src/object/sp-item.h b/src/object/sp-item.h
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+++ b/src/object/sp-item.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef SEEN_SP_ITEM_H
+#define SEEN_SP_ITEM_H
+
+/**
+ * @file
+ * Some things pertinent to all visible shapes: SPItem, SPItemView, SPItemCtx, SPItemClass, SPEvent.
+ */
+
+/*
+ * Authors:
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *   bulia byak <buliabyak@users.sf.net>
+ *   Johan Engelen <j.b.c.engelen@ewi.utwente.nl>
+ *   Abhishek Sharma
+ *
+ * Copyright (C) 1999-2006 authors
+ * Copyright (C) 2001-2002 Ximian, Inc.
+ * Copyright (C) 2004 Monash University
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <2geom/forward.h>
+#include <2geom/affine.h>
+#include <2geom/rect.h>
+#include <vector>
+
+#include "sp-object.h"
+
+#include "xml/repr.h"
+
+class SPGroup;
+class SPClipPath;
+class SPClipPathReference;
+class SPMask;
+class SPMaskReference;
+class SPAvoidRef;
+class SPPattern;
+struct SPPrintContext;
+typedef unsigned int guint32;
+
+namespace Inkscape {
+
+class Drawing;
+class DrawingItem;
+class URIReference;
+class SnapCandidatePoint;
+class SnapPreferences;
+
+namespace UI {
+namespace View {
+class SVGViewWidget;
+}
+}
+}
+
+// TODO make a completely new function that transforms either the fill or
+// stroke of any SPItem  without adding an extra parameter to adjust_pattern.
+enum PaintServerTransform { TRANSFORM_BOTH, TRANSFORM_FILL, TRANSFORM_STROKE };
+
+/**
+ * Event structure.
+ *
+ * @todo This is just placeholder. Plan:
+ * We do extensible event structure, that hold applicable (ui, non-ui)
+ * data pointers. So it is up to given object/arena implementation
+ * to process correct ones in meaningful way.
+ * Also, this probably goes to SPObject base class.
+ *
+ * GUI Code should not be here!
+ */
+class SPEvent {
+
+public:
+    enum Type {
+        INVALID,
+        NONE,
+        ACTIVATE,
+        MOUSEOVER,
+        MOUSEOUT
+    };
+
+    Type type;
+    Inkscape::UI::View::SVGViewWidget* view;
+};
+
+class SPItemView {
+public:
+    SPItemView *next;
+    unsigned int flags;
+    unsigned int key;
+    Inkscape::DrawingItem *arenaitem;
+};
+
+/* flags */
+
+#define SP_ITEM_BBOX_VISUAL 1
+
+#define SP_ITEM_SHOW_DISPLAY (1 << 0)
+
+/**
+ * Flag for referenced views (i.e. markers, clippaths, masks and patterns);
+ * currently unused, does the same as DISPLAY
+ */
+#define SP_ITEM_REFERENCE_FLAGS (1 << 1)
+
+/**
+ * Contains transformations to document/viewport and the viewport size.
+ */
+class SPItemCtx : public SPCtx {
+public:
+    /** Item to document transformation */
+    Geom::Affine i2doc;
+
+    /** Viewport size */
+    Geom::Rect viewport;
+
+    /** Item to viewport transformation */
+    Geom::Affine i2vp;
+};
+
+/**
+ * Base class for visual SVG elements.
+ * SPItem is an abstract base class for all graphic (visible) SVG nodes. It
+ * is a subclass of SPObject, with great deal of specific functionality.
+ */
+class SPItem : public SPObject {
+public:
+    enum BBoxType {
+        // legacy behavior: includes crude stroke, markers; excludes long miters, blur margin; is known to be wrong for caps
+        APPROXIMATE_BBOX,
+        // includes only the bare path bbox, no stroke, no nothing
+        GEOMETRIC_BBOX,
+        // includes everything: correctly done stroke (with proper miters and caps), markers, filter margins (e.g. blur)
+        VISUAL_BBOX
+    };
+
+    enum PaintServerType { PATTERN, HATCH, GRADIENT };
+
+    SPItem();
+    ~SPItem() override;
+
+    unsigned int sensitive : 1;
+    unsigned int stop_paint: 1;
+    mutable unsigned bbox_valid : 1;
+    double transform_center_x;
+    double transform_center_y;
+    bool freeze_stroke_width;
+
+    Geom::Affine transform;
+    mutable Geom::OptRect doc_bbox;
+    Geom::Rect viewport;  // Cache viewport information
+
+    SPClipPath *getClipObject() const;
+    SPMask *getMaskObject() const;
+
+    SPClipPathReference &getClipRef();
+    SPMaskReference &getMaskRef();
+
+    SPAvoidRef &getAvoidRef();
+
+  private:
+    SPClipPathReference *clip_ref;
+    SPMaskReference *mask_ref;
+
+    // Used for object-avoiding connectors
+    SPAvoidRef *avoidRef;
+
+  public:
+    SPItemView *display;
+
+    sigc::signal<void, Geom::Affine const *, SPItem *> _transformed_signal;
+
+    bool isLocked() const;
+    void setLocked(bool lock);
+
+    bool isHidden() const;
+    void setHidden(bool hidden);
+
+    // Objects dialogue
+    bool isSensitive() const {
+        return sensitive;
+    };
+
+    void setHighlight(guint32 color);
+    bool isHighlightSet() const;
+    virtual guint32 highlight_color() const;
+
+    //====================
+
+    bool isEvaluated() const;
+    void setEvaluated(bool visible);
+    void resetEvaluated();
+
+    bool isHidden(unsigned display_key) const;
+
+    /**
+     * Returns something suitable for the `Hide' checkbox in the Object Properties dialog box.
+     *  Corresponds to setExplicitlyHidden.
+     */
+    bool isExplicitlyHidden() const;
+
+    /**
+     * Sets the display CSS property to `hidden' if \a val is true,
+     * otherwise makes it unset.
+     */
+    void setExplicitlyHidden(bool val);
+
+    /**
+     * Sets the transform_center_x and transform_center_y properties to retain the rotation center
+     */
+    void setCenter(Geom::Point const &object_centre);
+
+    void unsetCenter();
+    bool isCenterSet() const;
+    Geom::Point getCenter() const;
+    void scaleCenter(Geom::Scale const &sc);
+
+    bool isVisibleAndUnlocked() const;
+
+    bool isVisibleAndUnlocked(unsigned display_key) const;
+
+    Geom::Affine getRelativeTransform(SPObject const *obj) const;
+
+    bool raiseOne();
+    bool lowerOne();
+    void raiseToTop();
+    void lowerToBottom();
+
+    SPGroup *getParentGroup() const;
+
+    /**
+     * Move this SPItem into or after another SPItem in the doc.
+     *
+     * @param target the SPItem to move into or after.
+     * @param intoafter move to after the target (false), move inside (sublayer) of the target (true).
+     */
+    void moveTo(SPItem *target, bool intoafter);
+
+    sigc::connection connectTransformed(sigc::slot<void, Geom::Affine const *, SPItem *> slot)  {
+        return _transformed_signal.connect(slot);
+    }
+
+    /**
+     * Get item's geometric bounding box in this item's coordinate system.
+     *
+     * The geometric bounding box includes only the path, disregarding all style attributes.
+     */
+    Geom::OptRect geometricBounds(Geom::Affine const &transform = Geom::identity()) const;
+
+    /**
+     * Get item's visual bounding box in this item's coordinate system.
+     *
+     * The visual bounding box includes the stroke and the filter region.
+     * @param wfilter use filter expand in bbox calculation
+     * @param wclip use clip data in bbox calculation
+     * @param wmask use mask data in bbox calculation
+     */
+    Geom::OptRect visualBounds(Geom::Affine const &transform = Geom::identity(), bool wfilter = true, bool wclip = true,
+                               bool wmask = true) const;
+
+    Geom::OptRect bounds(BBoxType type, Geom::Affine const &transform = Geom::identity()) const;
+
+    /**
+     * Get item's geometric bbox in document coordinate system.
+     * Document coordinates are the default coordinates of the root element:
+     * the origin is at the top left, X grows to the right and Y grows downwards.
+     */
+    Geom::OptRect documentGeometricBounds() const;
+
+    /**
+     * Get item's visual bbox in document coordinate system.
+     */
+    Geom::OptRect documentVisualBounds() const;
+
+    Geom::OptRect documentBounds(BBoxType type) const;
+    Geom::OptRect documentPreferredBounds() const;
+
+    /**
+     * Get item's geometric bbox in desktop coordinate system.
+     * Desktop coordinates should be user defined. Currently they are hardcoded:
+     * origin is at bottom left, X grows to the right and Y grows upwards.
+     */
+    Geom::OptRect desktopGeometricBounds() const;
+
+    /**
+     * Get item's visual bbox in desktop coordinate system.
+     */
+    Geom::OptRect desktopVisualBounds() const;
+
+    Geom::OptRect desktopPreferredBounds() const;
+    Geom::OptRect desktopBounds(BBoxType type) const;
+
+    unsigned int pos_in_parent() const;
+
+    /**
+     * Returns a string suitable for status bar, formatted in pango markup language.
+     *
+     * Must be freed by caller.
+     */
+    char *detailedDescription() const;
+
+    /**
+     * Returns true if the item is filtered, false otherwise.
+     * Used with groups/lists to determine how many, or if any, are filtered.
+     */
+    bool isFiltered() const;
+
+    SPObject* isInMask() const;
+
+    SPObject* isInClipPath() const;
+
+    void invoke_print(SPPrintContext *ctx);
+
+    /**
+     * Allocates unique integer keys.
+     *
+     * @param numkeys Number of keys required.
+     * @return First allocated key; hence if the returned key is n
+     * you can use n, n + 1, ..., n + (numkeys - 1)
+     */
+    static unsigned int display_key_new(unsigned int numkeys);
+
+    Inkscape::DrawingItem *invoke_show(Inkscape::Drawing &drawing, unsigned int key, unsigned int flags);
+
+    // Removed item from display tree.
+    void invoke_hide(unsigned int key);
+
+    void getSnappoints(std::vector<Inkscape::SnapCandidatePoint> &p, Inkscape::SnapPreferences const *snapprefs=nullptr) const;
+    void adjust_pattern(/* Geom::Affine const &premul, */ Geom::Affine const &postmul, bool set = false,
+                        PaintServerTransform = TRANSFORM_BOTH);
+    void adjust_hatch(/* Geom::Affine const &premul, */ Geom::Affine const &postmul, bool set = false,
+                      PaintServerTransform = TRANSFORM_BOTH);
+    void adjust_gradient(/* Geom::Affine const &premul, */ Geom::Affine const &postmul, bool set = false);
+    void adjust_stroke(double ex);
+
+    /**
+     * Recursively scale stroke width in \a item and its children by \a expansion.
+     */
+    void adjust_stroke_width_recursive(double ex);
+
+    void freeze_stroke_width_recursive(bool freeze);
+
+    /**
+     * Recursively compensate pattern or gradient transform.
+     */
+    void adjust_paint_recursive(Geom::Affine advertized_transform, Geom::Affine t_ancestors,
+                                PaintServerType type = GRADIENT);
+
+    /**
+     * Set a new transform on an object.
+     *
+     * Compensate for stroke scaling and gradient/pattern fill transform, if
+     * necessary. Call the object's set_transform method if transforms are
+     * stored optimized. Send _transformed_signal. Invoke _write method so that
+     * the repr is updated with the new transform.
+     */
+    void doWriteTransform(Geom::Affine const &transform, Geom::Affine const *adv = nullptr, bool compensate = true);
+
+    /**
+     * Sets item private transform (not propagated to repr), without compensating stroke widths,
+     * gradients, patterns as sp_item_write_transform does.
+     */
+    void set_item_transform(Geom::Affine const &transform_matrix);
+
+    int emitEvent (SPEvent &event);
+
+    /**
+     * Return the arenaitem corresponding to the given item in the display
+     * with the given key
+     */
+    Inkscape::DrawingItem *get_arenaitem(unsigned int key);
+
+    /**
+     * Returns the accumulated transformation of the item and all its ancestors, including root's viewport.
+     * @pre (item != NULL) and SP_IS_ITEM(item).
+     */
+    Geom::Affine i2doc_affine() const;
+
+    /**
+     * Returns the transformation from item to desktop coords
+     */
+    Geom::Affine i2dt_affine() const;
+
+    void set_i2d_affine(Geom::Affine const &transform);
+
+    /**
+     * should rather be named "sp_item_d2i_affine" to match "sp_item_i2d_affine" (or vice versa).
+     */
+    Geom::Affine dt2i_affine() const;
+
+    guint32 _highlightColor;
+
+private:
+    enum EvaluatedStatus
+    {
+        StatusUnknown, StatusCalculated, StatusSet
+    };
+
+    mutable bool _is_evaluated;
+    mutable EvaluatedStatus _evaluated_status;
+
+    static SPItemView *sp_item_view_new_prepend(SPItemView *list, SPItem *item, unsigned flags, unsigned key, Inkscape::DrawingItem *arenaitem);
+    static void clip_ref_changed(SPObject *old_clip, SPObject *clip, SPItem *item);
+    static void mask_ref_changed(SPObject *old_clip, SPObject *clip, SPItem *item);
+    static void fill_ps_ref_changed(SPObject *old_clip, SPObject *clip, SPItem *item);
+    static void stroke_ps_ref_changed(SPObject *old_clip, SPObject *clip, SPItem *item);
+
+public:
+        void rotate_rel(Geom::Rotate const &rotation);
+        void scale_rel(Geom::Scale const &scale);
+        void skew_rel(double skewX, double skewY);
+        void move_rel( Geom::Translate const &tr);
+	void build(SPDocument *document, Inkscape::XML::Node *repr) override;
+	void release() override;
+	void set(SPAttr key, char const* value) override;
+	void update(SPCtx *ctx, unsigned int flags) override;
+        void modified(unsigned int flags) override;
+	Inkscape::XML::Node* write(Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, unsigned int flags) override;
+
+	virtual Geom::OptRect bbox(Geom::Affine const &transform, SPItem::BBoxType type) const;
+	virtual void print(SPPrintContext *ctx);
+        virtual const char* typeName() const;
+        virtual const char* displayName() const;
+	virtual char* description() const;
+	virtual Inkscape::DrawingItem* show(Inkscape::Drawing &drawing, unsigned int key, unsigned int flags);
+	virtual void hide(unsigned int key);
+    virtual void snappoints(std::vector<Inkscape::SnapCandidatePoint> &p, Inkscape::SnapPreferences const *snapprefs) const;
+    virtual Geom::Affine set_transform(Geom::Affine const &transform);
+
+    virtual void convert_to_guides() const;
+
+    virtual int event(SPEvent *event);
+};
+
+
+// Utility
+
+/**
+ * @pre \a ancestor really is an ancestor (\>=) of \a object, or NULL.
+ *   ("Ancestor (\>=)" here includes as far as \a object itself.)
+ */
+Geom::Affine i2anc_affine(SPObject const *item, SPObject const *ancestor);
+
+Geom::Affine i2i_affine(SPObject const *src, SPObject const *dest);
+
+Geom::Affine sp_item_transform_repr (SPItem *item);
+
+/* fixme: - these are evil, but OK */
+
+int sp_item_repr_compare_position(SPItem const *first, SPItem const *second);
+
+inline bool sp_item_repr_compare_position_bool(SPObject const *first, SPObject const *second)
+{
+    return sp_repr_compare_position(first->getRepr(),
+            second->getRepr())<0;
+}
+
+
+SPItem *sp_item_first_item_child (SPObject *obj);
+SPItem const *sp_item_first_item_child (SPObject const *obj);
+
+MAKE_SP_OBJECT_DOWNCAST_FUNCTIONS(SP_ITEM, SPItem)
+MAKE_SP_OBJECT_TYPECHECK_FUNCTIONS(SP_IS_ITEM, SPItem)
+
+#endif // SEEN_SP_ITEM_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 :