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dbe961ca02
Images being aware of being visible inside the viewport is a painting concern, not a layout concern.
88 lines
2.5 KiB
C++
88 lines
2.5 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/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, ImageLoader const& image_loader)
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: ReplacedBox(document, element, move(style))
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, m_image_loader(image_loader)
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{
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}
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ImageBox::~ImageBox() = default;
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int ImageBox::preferred_width() const
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{
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return dom_node().attribute(HTML::AttributeNames::width).to_int().value_or(m_image_loader.width());
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}
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int ImageBox::preferred_height() const
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{
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return dom_node().attribute(HTML::AttributeNames::height).to_int().value_or(m_image_loader.height());
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}
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void ImageBox::prepare_for_replaced_layout()
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{
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if (!m_image_loader.has_loaded_or_failed()) {
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set_intrinsic_width(0);
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set_intrinsic_height(0);
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} else {
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if (m_image_loader.width()) {
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set_intrinsic_width(m_image_loader.width());
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}
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if (m_image_loader.height()) {
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set_intrinsic_height(m_image_loader.height());
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}
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if (m_image_loader.width() && m_image_loader.height()) {
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set_intrinsic_aspect_ratio((float)m_image_loader.width() / (float)m_image_loader.height());
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} else {
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set_intrinsic_aspect_ratio({});
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}
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}
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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 = font.width(alt);
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alt_text_width = m_cached_alt_text_width.value();
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set_intrinsic_width(alt_text_width + 16);
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set_intrinsic_height(font.pixel_size() + 16);
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}
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if (!has_intrinsic_width() && !has_intrinsic_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 !m_image_loader.has_image();
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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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