ladybird/Libraries/LibWeb/Layout/ImageBox.cpp
Tim Ledbetter aadd563592
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LibWeb: Replace usages of dynamic_cast with as and as_if
2025-08-22 20:26:09 +02:00

81 lines
2.3 KiB
C++

/*
* Copyright (c) 2018-2022, Andreas Kling <andreas@ladybird.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibWeb/HTML/BrowsingContext.h>
#include <LibWeb/HTML/DecodedImageData.h>
#include <LibWeb/Layout/ImageBox.h>
#include <LibWeb/Layout/ImageProvider.h>
#include <LibWeb/Painting/ImagePaintable.h>
#include <LibWeb/Platform/FontPlugin.h>
namespace Web::Layout {
GC_DEFINE_ALLOCATOR(ImageBox);
ImageBox::ImageBox(DOM::Document& document, GC::Ptr<DOM::Element> element, GC::Ref<CSS::ComputedProperties> style, ImageProvider const& image_provider)
: ReplacedBox(document, element, move(style))
, m_image_provider(image_provider)
{
}
ImageBox::~ImageBox() = default;
void ImageBox::visit_edges(JS::Cell::Visitor& visitor)
{
Base::visit_edges(visitor);
m_image_provider.image_provider_visit_edges(visitor);
}
void ImageBox::prepare_for_replaced_layout()
{
set_natural_width(m_image_provider.intrinsic_width());
set_natural_height(m_image_provider.intrinsic_height());
set_natural_aspect_ratio(m_image_provider.intrinsic_aspect_ratio());
if (renders_as_alt_text()) {
String alt;
if (auto element = dom_node())
alt = element->get_attribute_value(HTML::AttributeNames::alt);
if (alt.is_empty()) {
set_natural_width(0);
set_natural_height(0);
} else {
auto font = Platform::FontPlugin::the().default_font(12);
CSSPixels alt_text_width = 0;
if (!m_cached_alt_text_width.has_value())
m_cached_alt_text_width = CSSPixels::nearest_value_for(font->width(alt));
alt_text_width = m_cached_alt_text_width.value();
set_natural_width(alt_text_width + 16);
set_natural_height(CSSPixels::nearest_value_for(font->pixel_size()) + 16);
}
}
if (!has_natural_width() && !has_natural_height()) {
// FIXME: Do something.
}
}
void ImageBox::dom_node_did_update_alt_text(Badge<ImageProvider>)
{
m_cached_alt_text_width = {};
}
bool ImageBox::renders_as_alt_text() const
{
if (auto const* image_provider = as_if<ImageProvider>(dom_node().ptr()))
return !image_provider->is_image_available();
return false;
}
GC::Ptr<Painting::Paintable> ImageBox::create_paintable() const
{
return Painting::ImagePaintable::create(*this);
}
}