faf9746244
We were constantly measuring and re-measuring the "alt" attribute text of ImageBox layout nodes, even when the alt text didn't change. By caching this, we avoid a *lot* of repeated text measurement work.
46 lines
1.2 KiB
C++
46 lines
1.2 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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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 <LibWeb/HTML/BrowsingContext.h>
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#include <LibWeb/HTML/HTMLImageElement.h>
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#include <LibWeb/Layout/ReplacedBox.h>
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namespace Web::Layout {
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class ImageBox
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: public ReplacedBox
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, public HTML::BrowsingContext::ViewportClient {
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public:
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ImageBox(DOM::Document&, DOM::Element&, NonnullRefPtr<CSS::StyleProperties>, ImageLoader const&);
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virtual ~ImageBox() override;
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virtual void prepare_for_replaced_layout() override;
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const DOM::Element& dom_node() const { return static_cast<const DOM::Element&>(ReplacedBox::dom_node()); }
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bool renders_as_alt_text() const;
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virtual RefPtr<Painting::Paintable> create_paintable() const override;
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auto const& image_loader() const { return m_image_loader; }
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void dom_node_did_update_alt_text(Badge<HTML::HTMLImageElement>);
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private:
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// ^BrowsingContext::ViewportClient
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virtual void browsing_context_did_set_viewport_rect(Gfx::IntRect const&) final;
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int preferred_width() const;
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int preferred_height() const;
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ImageLoader const& m_image_loader;
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Optional<float> m_cached_alt_text_width;
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};
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}
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