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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.
114 lines
3.9 KiB
C++
114 lines
3.9 KiB
C++
/*
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* Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibGfx/Path.h>
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#include <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/Bindings/SVGCircleElementPrototype.h>
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#include <LibWeb/CSS/Parser/Parser.h>
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#include <LibWeb/Layout/Node.h>
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#include <LibWeb/SVG/AttributeNames.h>
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#include <LibWeb/SVG/AttributeParser.h>
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#include <LibWeb/SVG/SVGCircleElement.h>
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#include <LibWeb/SVG/SVGViewport.h>
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namespace Web::SVG {
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GC_DEFINE_ALLOCATOR(SVGCircleElement);
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SVGCircleElement::SVGCircleElement(DOM::Document& document, DOM::QualifiedName qualified_name)
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: SVGGeometryElement(document, qualified_name)
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{
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}
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void SVGCircleElement::initialize(JS::Realm& realm)
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{
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Base::initialize(realm);
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WEB_SET_PROTOTYPE_FOR_INTERFACE(SVGCircleElement);
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}
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bool SVGCircleElement::is_presentational_hint(FlyString const& name) const
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{
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if (Base::is_presentational_hint(name))
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return true;
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return first_is_one_of(name,
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SVG::AttributeNames::cx,
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SVG::AttributeNames::cy,
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SVG::AttributeNames::r);
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}
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void SVGCircleElement::apply_presentational_hints(GC::Ref<CSS::CascadedProperties> cascaded_properties) const
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{
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Base::apply_presentational_hints(cascaded_properties);
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auto parsing_context = CSS::Parser::ParsingContext { document(), CSS::Parser::ParsingContext::Mode::SVGPresentationAttribute };
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auto cx_attribute = attribute(SVG::AttributeNames::cx);
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if (auto cx_value = parse_css_value(parsing_context, cx_attribute.value_or(String {}), CSS::PropertyID::Cx))
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cascaded_properties->set_property_from_presentational_hint(CSS::PropertyID::Cx, cx_value.release_nonnull());
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auto cy_attribute = attribute(SVG::AttributeNames::cy);
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if (auto cy_value = parse_css_value(parsing_context, cy_attribute.value_or(String {}), CSS::PropertyID::Cy))
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cascaded_properties->set_property_from_presentational_hint(CSS::PropertyID::Cy, cy_value.release_nonnull());
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auto r_attribute = attribute(SVG::AttributeNames::r);
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if (auto r_value = parse_css_value(parsing_context, r_attribute.value_or(String {}), CSS::PropertyID::R))
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cascaded_properties->set_property_from_presentational_hint(CSS::PropertyID::R, r_value.release_nonnull());
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}
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Gfx::Path SVGCircleElement::get_path(CSSPixelSize viewport_size)
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{
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auto node = layout_node();
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auto cx = float(node->computed_values().cx().to_px(*node, viewport_size.width()));
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auto cy = float(node->computed_values().cy().to_px(*node, viewport_size.height()));
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// Percentages refer to the normalized diagonal of the current SVG viewport
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// (see Units: https://svgwg.org/svg2-draft/coords.html#Units)
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auto r = float(node->computed_values().r().to_px(*node, normalized_diagonal_length(viewport_size)));
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// A zero radius disables rendering.
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if (r == 0)
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return {};
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Gfx::Path path;
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bool large_arc = false;
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bool sweep = true;
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// 1. A move-to command to the point cx+r,cy;
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path.move_to({ cx + r, cy });
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// 2. arc to cx,cy+r;
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path.arc_to({ cx, cy + r }, r, large_arc, sweep);
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// 3. arc to cx-r,cy;
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path.arc_to({ cx - r, cy }, r, large_arc, sweep);
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// 4. arc to cx,cy-r;
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path.arc_to({ cx, cy - r }, r, large_arc, sweep);
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// 5. arc with a segment-completing close path operation.
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path.arc_to({ cx + r, cy }, r, large_arc, sweep);
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return path;
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}
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// https://www.w3.org/TR/SVG11/shapes.html#CircleElementCXAttribute
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GC::Ref<SVGAnimatedLength> SVGCircleElement::cx() const
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{
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return svg_animated_length_for_property(CSS::PropertyID::Cx);
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}
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// https://www.w3.org/TR/SVG11/shapes.html#CircleElementCYAttribute
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GC::Ref<SVGAnimatedLength> SVGCircleElement::cy() const
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{
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return svg_animated_length_for_property(CSS::PropertyID::Cy);
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}
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// https://www.w3.org/TR/SVG11/shapes.html#CircleElementRAttribute
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GC::Ref<SVGAnimatedLength> SVGCircleElement::r() const
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{
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return svg_animated_length_for_property(CSS::PropertyID::R);
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}
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}
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