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79740b04b3
Reduces the time spent in `background_layers()` from 1.5% to 0.04% when loading https://en.wikipedia.org/wiki/2023_in_American_television
51 lines
1.8 KiB
C++
51 lines
1.8 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <andreas@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/Bindings/HTMLHtmlElementPrototype.h>
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#include <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/CSS/ComputedProperties.h>
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#include <LibWeb/HTML/HTMLBodyElement.h>
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#include <LibWeb/HTML/HTMLHtmlElement.h>
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#include <LibWeb/Layout/Node.h>
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namespace Web::HTML {
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GC_DEFINE_ALLOCATOR(HTMLHtmlElement);
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HTMLHtmlElement::HTMLHtmlElement(DOM::Document& document, DOM::QualifiedName qualified_name)
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: HTMLElement(document, move(qualified_name))
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{
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}
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HTMLHtmlElement::~HTMLHtmlElement() = default;
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void HTMLHtmlElement::initialize(JS::Realm& realm)
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{
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WEB_SET_PROTOTYPE_FOR_INTERFACE(HTMLHtmlElement);
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Base::initialize(realm);
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}
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bool HTMLHtmlElement::should_use_body_background_properties() const
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{
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// https://drafts.csswg.org/css-contain-2/#contain-property
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// Additionally, when any containments are active on either the HTML <html> or <body> elements, propagation of
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// properties from the <body> element to the initial containing block, the viewport, or the canvas background, is
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// disabled. Notably, this affects:
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// - 'background' and its longhands (see CSS Backgrounds 3 § 2.11.2 The Canvas Background and the HTML <body> Element)
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if (!computed_properties()->contain().is_empty())
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return false;
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auto* body_element = first_child_of_type<HTML::HTMLBodyElement>();
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if (body_element && !body_element->computed_properties()->contain().is_empty())
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return false;
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auto background_color = layout_node()->computed_values().background_color();
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auto const& background_layers = layout_node()->background_layers();
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return background_layers.is_empty() && background_color == Color::Transparent;
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}
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}
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