360c0eb509
In general it is not safe to convert any arbitrary floating-point value to CSSPixels. CSSPixels has a resolution of 0.015625, which for small values (e.g. scale factors between 0 and 1), can produce bad results if converted to CSSPixels then scaled back up. In the worst case values can underflow to zero and produce incorrect results.
66 lines
2 KiB
C++
66 lines
2 KiB
C++
/*
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* Copyright (c) 2018-2022, 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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#include <LibWeb/HTML/BrowsingContext.h>
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#include <LibWeb/HTML/DecodedImageData.h>
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#include <LibWeb/HTML/ImageRequest.h>
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#include <LibWeb/Layout/ImageBox.h>
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#include <LibWeb/Painting/ImagePaintable.h>
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#include <LibWeb/Platform/FontPlugin.h>
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namespace Web::Layout {
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ImageBox::ImageBox(DOM::Document& document, DOM::Element& element, NonnullRefPtr<CSS::StyleProperties> style, ImageProvider const& image_provider)
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: ReplacedBox(document, element, move(style))
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, m_image_provider(image_provider)
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{
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}
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ImageBox::~ImageBox() = default;
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void ImageBox::prepare_for_replaced_layout()
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{
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set_natural_width(m_image_provider.intrinsic_width());
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set_natural_height(m_image_provider.intrinsic_height());
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set_natural_aspect_ratio(m_image_provider.intrinsic_aspect_ratio());
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if (renders_as_alt_text()) {
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auto& image_element = verify_cast<HTML::HTMLImageElement>(dom_node());
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auto& font = Platform::FontPlugin::the().default_font();
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auto alt = image_element.alt();
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CSSPixels alt_text_width = 0;
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if (!m_cached_alt_text_width.has_value())
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m_cached_alt_text_width = CSSPixels(font.width(alt));
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alt_text_width = m_cached_alt_text_width.value();
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set_natural_width(alt_text_width + 16);
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set_natural_height(CSSPixels(font.pixel_size()) + 16);
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}
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if (!has_natural_width() && !has_natural_height()) {
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// FIXME: Do something.
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}
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}
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void ImageBox::dom_node_did_update_alt_text(Badge<HTML::HTMLImageElement>)
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{
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m_cached_alt_text_width = {};
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}
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bool ImageBox::renders_as_alt_text() const
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{
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if (is<HTML::HTMLImageElement>(dom_node()))
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return !static_cast<HTML::HTMLImageElement const&>(dom_node()).current_request().is_available();
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return false;
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}
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JS::GCPtr<Painting::Paintable> ImageBox::create_paintable() const
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{
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return Painting::ImagePaintable::create(*this);
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}
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}
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