LibWeb: Add more fast_is<T> helpers for layout and paintable nodes

Author: https://github.com/awesomekling
Commit: https://github.com/LadybirdBrowser/ladybird/commit/877391d5694
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4395

Libraries/LibWeb/Layout/Node.h

@@ -101,6 +101,7 @@ public:
     virtual bool is_svg_geometry_box() const { return false; }
     virtual bool is_svg_mask_box() const { return false; }
     virtual bool is_svg_svg_box() const { return false; }
+    virtual bool is_svg_graphics_box() const { return false; }
     virtual bool is_label() const { return false; }
     virtual bool is_replaced_box() const { return false; }
     virtual bool is_list_item_box() const { return false; }
@@ -108,6 +109,7 @@ public:
     virtual bool is_fieldset_box() const { return false; }
     virtual bool is_legend_box() const { return false; }
     virtual bool is_table_wrapper() const { return false; }
+    virtual bool is_node_with_style() const { return false; }
     virtual bool is_node_with_style_and_box_model_metrics() const { return false; }
 
     template<typename T>
@@ -245,6 +247,8 @@ protected:
     NodeWithStyle(DOM::Document&, DOM::Node*, NonnullOwnPtr<CSS::ComputedValues>);
 
 private:
+    virtual bool is_node_with_style() const final { return true; }
+
     void reset_table_box_computed_values_used_by_wrapper_to_init_values();
     void propagate_style_to_anonymous_wrappers();
 
@@ -252,6 +256,9 @@ private:
     RefPtr<CSS::AbstractImageStyleValue const> m_list_style_image;
 };
 
+template<>
+inline bool Node::fast_is<NodeWithStyle>() const { return is_node_with_style(); }
+
 class NodeWithStyleAndBoxModelMetrics : public NodeWithStyle {
     GC_CELL(NodeWithStyleAndBoxModelMetrics, NodeWithStyle);
 

Libraries/LibWeb/Layout/SVGGraphicsBox.h

@@ -23,6 +23,12 @@ public:
     SVG::SVGGraphicsElement const& dom_node() const { return as<SVG::SVGGraphicsElement>(SVGBox::dom_node()); }
 
     virtual GC::Ptr<Painting::Paintable> create_paintable() const override;
+
+private:
+    virtual bool is_svg_graphics_box() const override { return true; }
 };
 
+template<>
+inline bool Node::fast_is<SVGGraphicsBox>() const { return is_svg_graphics_box(); }
+
 }

Libraries/LibWeb/Painting/Paintable.h

@@ -125,6 +125,7 @@ public:
     [[nodiscard]] virtual bool is_paintable_box() const { return false; }
     [[nodiscard]] virtual bool is_paintable_with_lines() const { return false; }
     [[nodiscard]] virtual bool is_svg_paintable() const { return false; }
+    [[nodiscard]] virtual bool is_svg_svg_paintable() const { return false; }
     [[nodiscard]] virtual bool is_text_paintable() const { return false; }
 
     DOM::Document const& document() const;

Libraries/LibWeb/Painting/SVGSVGPaintable.h

@@ -28,6 +28,12 @@ public:
 
 protected:
     SVGSVGPaintable(Layout::SVGSVGBox const&);
+
+private:
+    virtual bool is_svg_svg_paintable() const final { return true; }
 };
 
+template<>
+inline bool Paintable::fast_is<SVGSVGPaintable>() const { return is_svg_svg_paintable(); }
+
 }