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diff --git a/src/display/drawing-item.h b/src/display/drawing-item.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/**
+ * @file
+ * Canvas item belonging to an SVG drawing element.
+ *//*
+ * Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *
+ * Copyright (C) 2011 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_INKSCAPE_DISPLAY_DRAWING_ITEM_H
+#define SEEN_INKSCAPE_DISPLAY_DRAWING_ITEM_H
+
+#include <2geom/rect.h>
+#include <2geom/affine.h>
+#include <boost/operators.hpp>
+#include <boost/utility.hpp>
+#include <boost/intrusive/list.hpp>
+#include <exception>
+#include <list>
+
+#include "style-enums.h"
+
+namespace Glib {
+class ustring;
+}
+
+class SPStyle;
+class SPItem;
+
+namespace Inkscape {
+
+class Drawing;
+class DrawingCache;
+class DrawingContext;
+class DrawingItem;
+class DrawingPattern;
+
+namespace Filters {
+
+class Filter;
+
+} // namespace Filters
+
+
+
+struct UpdateContext {
+    Geom::Affine ctm;
+};
+
+struct CacheRecord
+    : boost::totally_ordered<CacheRecord>
+{
+    bool operator<(CacheRecord const &other) const { return score < other.score; }
+    bool operator==(CacheRecord const &other) const { return score == other.score; }
+    operator DrawingItem *() const { return item; }
+    double score;
+    size_t cache_size;
+    DrawingItem *item;
+};
+typedef std::list<CacheRecord> CacheList;
+
+class InvalidItemException : public std::exception {
+    const char *what() const noexcept override {
+        return "Invalid item in drawing";
+    }
+};
+
+class DrawingItem
+    : boost::noncopyable
+{
+public:
+    enum RenderFlags {
+        RENDER_DEFAULT = 0,
+        RENDER_CACHE_ONLY = 1,
+        RENDER_BYPASS_CACHE = 2,
+        RENDER_FILTER_BACKGROUND = 4
+    };
+    enum StateFlags {
+        STATE_NONE = 0,
+        STATE_BBOX = (1<<0),    // bounding boxes are up-to-date
+        STATE_CACHE = (1<<1),   // cache extents and clean area are up-to-date
+        STATE_PICK = (1<<2),    // can process pick requests
+        STATE_RENDER = (1<<3),  // can be rendered
+        STATE_BACKGROUND = (1<<4), // filter background data is up to date
+        STATE_ALL = (1<<5)-1
+    };
+    enum PickFlags {
+        PICK_NORMAL = 0, // normal pick
+        PICK_STICKY = (1<<0), // sticky pick - ignore visibility and sensitivity
+        PICK_AS_CLIP = (1<<2) // pick with no stroke and opaque fill regardless of item style
+    };
+
+    DrawingItem(Drawing &drawing);
+    virtual ~DrawingItem();
+
+    Geom::OptIntRect geometricBounds() const { return _bbox; }
+    Geom::OptIntRect visualBounds() const { return _drawbox; }
+    Geom::OptRect itemBounds() const { return _item_bbox; }
+    Geom::Affine ctm() const { return _ctm; }
+    Geom::Affine transform() const { return _transform ? *_transform : Geom::identity(); }
+    Drawing &drawing() const { return _drawing; }
+    DrawingItem *parent() const;
+    bool isAncestorOf(DrawingItem *item) const;
+
+    void appendChild(DrawingItem *item);
+    void prependChild(DrawingItem *item);
+    void clearChildren();
+
+    bool visible() const { return _visible; }
+    void setVisible(bool v);
+    bool sensitive() const { return _sensitive; }
+    void setSensitive(bool v);
+    bool cached() const { return _cached; }
+    void setCached(bool c, bool persistent = false);
+
+    virtual void setStyle(SPStyle *style, SPStyle *context_style = nullptr);
+    virtual void setChildrenStyle(SPStyle *context_style);
+    void setOpacity(float opacity);
+    void setAntialiasing(unsigned a);
+    void setIsolation(bool isolation); // CSS Compositing and Blending
+    void setBlendMode(SPBlendMode blend_mode);
+    void setTransform(Geom::Affine const &trans);
+    void setClip(DrawingItem *item);
+    void setMask(DrawingItem *item);
+    void setFillPattern(DrawingPattern *pattern);
+    void setStrokePattern(DrawingPattern *pattern);
+    void setZOrder(unsigned z);
+    void setItemBounds(Geom::OptRect const &bounds);
+    void setFilterBounds(Geom::OptRect const &bounds);
+
+    void setKey(unsigned key) { _key = key; }
+    unsigned key() const { return _key; }
+    void setItem(SPItem *item) { _item = item; }
+    SPItem* getItem() const { return _item; } // SPItem
+
+
+    void update(Geom::IntRect const &area = Geom::IntRect::infinite(), UpdateContext const &ctx = UpdateContext(), unsigned flags = STATE_ALL, unsigned reset = 0);
+    unsigned render(DrawingContext &dc, Geom::IntRect const &area, unsigned flags = 0, DrawingItem *stop_at = nullptr);
+    void clip(DrawingContext &dc, Geom::IntRect const &area);
+    DrawingItem *pick(Geom::Point const &p, double delta, unsigned flags = 0);
+
+    virtual Glib::ustring name(); // For debugging
+    void recursivePrintTree(unsigned level = 0);  // For debugging
+
+protected:
+    enum ChildType {
+        CHILD_ORPHAN = 0, // no parent - implies _parent == NULL
+        CHILD_NORMAL = 1, // contained in _children of parent
+        CHILD_CLIP = 2, // referenced by _clip member of parent
+        CHILD_MASK = 3, // referenced by _mask member of parent
+        CHILD_ROOT = 4, // root item of _drawing
+        CHILD_FILL_PATTERN = 5, // referenced by fill pattern of parent
+        CHILD_STROKE_PATTERN = 6 // referenced by stroke pattern of parent
+    };
+    enum RenderResult {
+        RENDER_OK = 0,
+        RENDER_STOP = 1
+    };
+    void _renderOutline(DrawingContext &dc, Geom::IntRect const &area, unsigned flags);
+    void _markForUpdate(unsigned state, bool propagate);
+    void _markForRendering();
+    void _invalidateFilterBackground(Geom::IntRect const &area);
+    double _cacheScore();
+    Geom::OptIntRect _cacheRect();
+    virtual unsigned _updateItem(Geom::IntRect const &/*area*/, UpdateContext const &/*ctx*/,
+                                 unsigned /*flags*/, unsigned /*reset*/) { return 0; }
+    virtual unsigned _renderItem(DrawingContext &/*dc*/, Geom::IntRect const &/*area*/, unsigned /*flags*/,
+                                 DrawingItem * /*stop_at*/) { return RENDER_OK; }
+    virtual void _clipItem(DrawingContext &/*dc*/, Geom::IntRect const &/*area*/) {}
+    virtual DrawingItem *_pickItem(Geom::Point const &/*p*/, double /*delta*/, unsigned /*flags*/) { return nullptr; }
+    virtual bool _canClip() { return false; }
+
+    // static functions start here
+
+    static void _applyAntialias(DrawingContext & /*dc*/, unsigned /*_antialias*/);
+
+    // member variables start here
+
+    Drawing &_drawing;
+    DrawingItem *_parent;
+
+    typedef boost::intrusive::list_member_hook<> ListHook;
+    ListHook _child_hook;
+
+    typedef boost::intrusive::list<
+        DrawingItem,
+        boost::intrusive::member_hook<DrawingItem, ListHook, &DrawingItem::_child_hook>
+        > ChildrenList;
+    ChildrenList _children;
+
+    unsigned _key; ///< Some SPItems can have more than one DrawingItem;
+                   ///  this value is a hack used to distinguish between them
+    SPStyle *_style; // Not used by DrawingGlyphs
+    SPStyle *_context_style; // Used for 'context-fill', 'context-stroke'
+    
+    float _opacity;
+
+    Geom::Affine *_transform; ///< Incremental transform from parent to this item's coords
+    Geom::Affine _ctm; ///< Total transform from item coords to display coords
+    Geom::OptIntRect _bbox; ///< Bounding box in display (pixel) coords including stroke
+    Geom::OptIntRect _drawbox; ///< Full visual bounding box - enlarged by filters, shrunk by clips and masks
+    Geom::OptRect _item_bbox; ///< Geometric bounding box in item's user space.
+                              ///  This is used to compute the filter effect region and render in
+                              ///  objectBoundingBox units.
+
+    DrawingItem *_clip;
+    DrawingItem *_mask;
+    DrawingPattern *_fill_pattern;
+    DrawingPattern *_stroke_pattern;
+    Inkscape::Filters::Filter *_filter;
+    SPItem *_item; ///< Used to associate DrawingItems with SPItems that created them
+    DrawingCache *_cache;
+    bool _prev_nir = false;
+
+    CacheList::iterator _cache_iterator;
+
+    unsigned _state : 8;
+    unsigned _propagate_state : 8;
+    unsigned _child_type : 3; // see ChildType enum
+    unsigned _background_new : 1; ///< Whether enable-background: new is set for this element
+    unsigned _background_accumulate : 1; ///< Whether this element accumulates background 
+                                         ///  (has any ancestor with enable-background: new)
+    unsigned _visible : 1;
+    unsigned _sensitive : 1; ///< Whether this item responds to events
+    unsigned _cached : 1; ///< Whether the rendering is stored for reuse
+    unsigned _cached_persistent : 1; ///< If set, will always be cached regardless of score
+    unsigned _has_cache_iterator : 1; ///< If set, _cache_iterator is valid
+    unsigned _propagate : 1; ///< Whether to call update for all children on next update
+    //unsigned _renders_opacity : 1; ///< Whether object needs temporary surface for opacity
+    unsigned _pick_children : 1; ///< For groups: if true, children are returned from pick(),
+                                 ///  otherwise the group is returned
+    unsigned _antialias : 2; ///< antialiasing level (NONE/FAST/GOOD(DEFAULT)/BEST)
+
+    bool _isolation : 1;
+    SPBlendMode _mix_blend_mode;
+
+    friend class Drawing;
+};
+
+struct DeleteDisposer {
+    void operator()(DrawingItem *item) { delete item; }
+};
+
+} // end namespace Inkscape
+
+#endif // !SEEN_INKSCAPE_DISPLAY_DRAWING_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 :