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https://github.com/LadybirdBrowser/ladybird.git
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b981e6f7bc
Many times, attribute mutation doesn't necessitate a full style invalidation on the element. However, the conditions are pretty elaborate, so this first version has a lot of false positives. We only need to invalidate style when any of these things apply: 1. The change may affect the match state of a selector somewhere. 2. The change may affect presentational hints applied to the element. For (1) in this first version, we have a fixed list of attribute names that may affect selectors. We also collect all names referenced by attribute selectors anywhere in the document. For (2), we add a new Element::is_presentational_hint() virtual that tells us whether a given attribute name is a presentational hint. This drastically reduces style work on many websites. As an example, https://cnn.com/ is once again browseable.
122 lines
4.4 KiB
C++
122 lines
4.4 KiB
C++
/*
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* Copyright (c) 2020, Matthew Olsson <matthewcolsson@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <LibGfx/Bitmap.h>
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#include <LibWeb/DOM/NonElementParentNode.h>
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#include <LibWeb/Geometry/DOMMatrix.h>
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#include <LibWeb/Geometry/DOMPoint.h>
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#include <LibWeb/SVG/AttributeParser.h>
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#include <LibWeb/SVG/SVGAnimatedLength.h>
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#include <LibWeb/SVG/SVGGraphicsElement.h>
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#include <LibWeb/SVG/SVGLength.h>
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#include <LibWeb/SVG/SVGTransform.h>
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#include <LibWeb/SVG/SVGViewport.h>
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#include <LibWeb/SVG/ViewBox.h>
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#include <LibWeb/WebIDL/Types.h>
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namespace Web::SVG {
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class SVGSVGElement final : public SVGGraphicsElement
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, public SVGViewport
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// SVGSVGElement is not strictly a NonElementParentNode, but it implements the same get_element_by_id() method.
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, public DOM::NonElementParentNode<SVGSVGElement> {
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WEB_PLATFORM_OBJECT(SVGSVGElement, SVGGraphicsElement);
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GC_DECLARE_ALLOCATOR(SVGSVGElement);
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public:
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virtual GC::Ptr<Layout::Node> create_layout_node(GC::Ref<CSS::ComputedProperties>) override;
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virtual bool is_presentational_hint(FlyString const&) const override;
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virtual void apply_presentational_hints(GC::Ref<CSS::CascadedProperties>) const override;
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virtual bool requires_svg_container() const override { return false; }
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virtual bool is_svg_container() const override { return true; }
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virtual Optional<ViewBox> view_box() const override;
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virtual Optional<PreserveAspectRatio> preserve_aspect_ratio() const override { return m_preserve_aspect_ratio; }
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void set_fallback_view_box_for_svg_as_image(Optional<ViewBox>);
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GC::Ref<SVGAnimatedRect> view_box_for_bindings() { return *m_view_box_for_bindings; }
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GC::Ref<SVGAnimatedLength> x() const;
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GC::Ref<SVGAnimatedLength> y() const;
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GC::Ref<SVGAnimatedLength> width() const;
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GC::Ref<SVGAnimatedLength> height() const;
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float current_scale() const;
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void set_current_scale(float);
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GC::Ref<Geometry::DOMPointReadOnly> current_translate() const;
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GC::Ref<DOM::NodeList> get_intersection_list(GC::Ref<Geometry::DOMRectReadOnly> rect, GC::Ptr<SVGElement> reference_element) const;
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GC::Ref<DOM::NodeList> get_enclosure_list(GC::Ref<Geometry::DOMRectReadOnly> rect, GC::Ptr<SVGElement> reference_element) const;
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bool check_intersection(GC::Ref<SVGElement> element, GC::Ref<Geometry::DOMRectReadOnly> rect) const;
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bool check_enclosure(GC::Ref<SVGElement> element, GC::Ref<Geometry::DOMRectReadOnly> rect) const;
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void deselect_all() const;
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GC::Ref<SVGLength> create_svg_length() const;
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GC::Ref<Geometry::DOMPoint> create_svg_point() const;
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GC::Ref<Geometry::DOMMatrix> create_svg_matrix() const;
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GC::Ref<Geometry::DOMRect> create_svg_rect() const;
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GC::Ref<SVGTransform> create_svg_transform() const;
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// Deprecated methods that have no effect when called, but which are kept for compatibility reasons.
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WebIDL::UnsignedLong suspend_redraw(WebIDL::UnsignedLong max_wait_milliseconds) const
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{
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(void)max_wait_milliseconds;
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// When the suspendRedraw method is called, it must return 1.
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return 1;
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}
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void unsuspend_redraw(WebIDL::UnsignedLong suspend_handle_id) const
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{
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(void)suspend_handle_id;
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}
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void unsuspend_redraw_all() const { }
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void force_redraw() const { }
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[[nodiscard]] RefPtr<CSS::CSSStyleValue> width_style_value_from_attribute() const;
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[[nodiscard]] RefPtr<CSS::CSSStyleValue> height_style_value_from_attribute() const;
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struct NaturalMetrics {
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Optional<CSSPixels> width;
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Optional<CSSPixels> height;
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Optional<CSSPixelFraction> aspect_ratio;
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};
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static NaturalMetrics negotiate_natural_metrics(SVGSVGElement const&);
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private:
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SVGSVGElement(DOM::Document&, DOM::QualifiedName);
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virtual void initialize(JS::Realm&) override;
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virtual void visit_edges(Visitor&) override;
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virtual bool is_svg_svg_element() const override { return true; }
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virtual void attribute_changed(FlyString const& name, Optional<String> const& old_value, Optional<String> const& value, Optional<FlyString> const& namespace_) override;
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void update_fallback_view_box_for_svg_as_image();
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Optional<ViewBox> m_view_box;
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Optional<PreserveAspectRatio> m_preserve_aspect_ratio;
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Optional<ViewBox> m_fallback_view_box_for_svg_as_image;
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GC::Ptr<SVGAnimatedRect> m_view_box_for_bindings;
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};
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}
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namespace Web::DOM {
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template<>
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inline bool Node::fast_is<SVG::SVGSVGElement>() const { return is_svg_svg_element(); }
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}
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