1 files changed, 188 insertions, 0 deletions
diff --git a/src/object/sp-pattern.h b/src/object/sp-pattern.h
new file mode 100644
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--- /dev/null
+++ b/src/object/sp-pattern.h
@@ -0,0 +1,188 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * SVG <pattern> implementation
+ *//*
+ * Author:
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *   Abhishek Sharma
+ *
+ * Copyright (C) 2002 Lauris Kaplinski
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_SP_PATTERN_H
+#define SEEN_SP_PATTERN_H
+
+#include <memory>
+#include <vector>
+#include <cstddef>
+#include <glibmm/ustring.h>
+#include <sigc++/connection.h>
+
+#include "svg/svg-length.h"
+#include "sp-paint-server.h"
+#include "uri-references.h"
+#include "viewbox.h"
+#include "display/drawing-item-ptr.h"
+
+class SPPattern;
+class SPItem;
+
+namespace Inkscape {
+namespace XML {
+class Node;
+} // namespace XML
+} // namespace Inkscape
+
+class SPPatternReference
+    : public Inkscape::URIReference
+{
+public:
+    SPPatternReference(SPPattern *owner);
+    SPPattern *getObject() const;
+
+protected:
+    bool _acceptObject(SPObject *obj) const override;
+};
+
+class SPPattern final
+    : public SPPaintServer
+    , public SPViewBox
+{
+public:
+    enum PatternUnits
+    {
+        UNITS_USERSPACEONUSE,
+        UNITS_OBJECTBOUNDINGBOX
+    };
+
+    SPPattern();
+    ~SPPattern() override;
+    int tag() const override { return tag_of<decltype(*this)>; }
+
+    // Reference (href)
+    Glib::ustring href;
+    SPPatternReference ref;
+
+    double x() const;
+    double y() const;
+    double width() const;
+    double height() const;
+    Geom::OptRect viewbox() const;
+    SPPattern::PatternUnits patternUnits() const;
+    SPPattern::PatternUnits patternContentUnits() const;
+    Geom::Affine const &getTransform() const;
+    SPPattern const *rootPattern() const;
+    SPPattern *rootPattern();
+    const Geom::Affine& get_this_transform() const;
+
+    SPPattern *clone_if_necessary(SPItem *item, char const *property);
+    void transform_multiply(Geom::Affine postmul, bool set);
+
+    /**
+     * @brief create a new pattern in XML tree
+     * @return created pattern id
+     */
+    static char const *produce(std::vector<Inkscape::XML::Node*> const &reprs, Geom::Rect const &bounds,
+                               SPDocument *document, Geom::Affine const &transform, Geom::Affine const &move);
+
+    bool isValid() const override;
+
+protected:
+    void build(SPDocument *doc, Inkscape::XML::Node *repr) override;
+    void release() override;
+    void set(SPAttr key, char const *value) override;
+    void update(SPCtx *ctx, unsigned flags) override;
+    void modified(unsigned flags) override;
+
+    void child_added(Inkscape::XML::Node* child, Inkscape::XML::Node* ref) override;
+    void remove_child(Inkscape::XML::Node* child) override;
+    void order_changed(Inkscape::XML::Node *child, Inkscape::XML::Node *old_ref, Inkscape::XML::Node *new_ref) override;
+
+    Inkscape::DrawingPattern *show(Inkscape::Drawing &drawing, unsigned key, Geom::OptRect const &bbox) override;
+    void hide(unsigned key) override;
+    void setBBox(unsigned key, Geom::OptRect const &bbox) override;
+
+private:
+    bool _hasItemChildren() const;
+
+    SPPattern *_chain() const;
+
+    /**
+     * Count how many times pattern is used by the styles of o and its descendants
+     */
+    unsigned _countHrefs(SPObject *o) const;
+
+    /**
+     * Gets called when the pattern is reattached to another <pattern>
+     */
+    void _onRefChanged(SPObject *old_ref, SPObject *ref);
+
+    /**
+     * Gets called when the referenced <pattern> is changed
+     */
+    void _onRefModified(SPObject *ref, unsigned flags);
+
+    /* patternUnits and patternContentUnits attribute */
+    PatternUnits _pattern_units : 1;
+    bool _pattern_units_set : 1;
+    PatternUnits _pattern_content_units : 1;
+    bool _pattern_content_units_set : 1;
+    /* patternTransform attribute */
+    Geom::Affine _pattern_transform;
+    bool _pattern_transform_set : 1;
+    /* Tile rectangle */
+    SVGLength _x;
+    SVGLength _y;
+    SVGLength _width;
+    SVGLength _height;
+
+    sigc::connection _modified_connection;
+
+    /**
+     * The pattern at the end of the href chain, currently tasked with keeping our DrawingPattern
+     * up to date. When 'shown' is deleted, our DrawingPattern will be unattached from it and 'shown'
+     * will be nulled. Later (asynchronously), 'shown' will be re-resolved to another Pattern and our
+     * DrawingPattern will be re-attached to that.
+     */
+    SPPattern *shown;
+    sigc::connection shown_released_connection;
+    void set_shown(SPPattern *new_shown);
+
+    /**
+     * Drawing items belonging to other patterns with this pattern at the end of their href chain.
+     * They will be updated in sync with this pattern's children.
+     */
+    struct AttachedView
+    {
+        Inkscape::DrawingPattern *drawingitem;
+        unsigned key;
+    };
+    std::vector<AttachedView> attached_views;
+    void attach_view(Inkscape::DrawingPattern *di, unsigned key);
+    void unattach_view(Inkscape::DrawingPattern *di);
+
+    struct View
+    {
+        DrawingItemPtr<Inkscape::DrawingPattern> drawingitem;
+        Geom::OptRect bbox;
+        unsigned key;
+        View(DrawingItemPtr<Inkscape::DrawingPattern> drawingitem, Geom::OptRect const &bbox, unsigned key);
+    };
+    std::vector<View> views;
+    void update_view(View &v);
+};
+
+#endif // SEEN_SP_PATTERN_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 :