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/*
* Copyright (c) 2018-2022, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibGfx/Bitmap.h>
#include <LibWeb/ARIA/Roles.h>
#include <LibWeb/CSS/Parser/Parser.h>
#include <LibWeb/CSS/StyleComputer.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/DOM/Event.h>
#include <LibWeb/HTML/EventNames.h>
#include <LibWeb/HTML/HTMLImageElement.h>
#include <LibWeb/HTML/Parser/HTMLParser.h>
#include <LibWeb/Layout/ImageBox.h>
#include <LibWeb/Loader/ResourceLoader.h>
#include <LibWeb/Painting/PaintableBox.h>
namespace Web::HTML {
HTMLImageElement::HTMLImageElement(DOM::Document& document, DOM::QualifiedName qualified_name)
: HTMLElement(document, move(qualified_name))
, m_image_loader(*this)
{
m_image_loader.on_load = [this] {
set_needs_style_update(true);
this->document().set_needs_layout();
queue_an_element_task(HTML::Task::Source::DOMManipulation, [this] {
dispatch_event(DOM::Event::create(this->realm(), EventNames::load).release_value_but_fixme_should_propagate_errors());
m_load_event_delayer.clear();
});
};
m_image_loader.on_fail = [this] {
dbgln("HTMLImageElement: Resource did fail: {}", src());
set_needs_style_update(true);
this->document().set_needs_layout();
queue_an_element_task(HTML::Task::Source::DOMManipulation, [this] {
dispatch_event(DOM::Event::create(this->realm(), EventNames::error).release_value_but_fixme_should_propagate_errors());
m_load_event_delayer.clear();
});
};
m_image_loader.on_animate = [this] {
if (layout_node())
layout_node()->set_needs_display();
};
}
HTMLImageElement::~HTMLImageElement() = default;
JS::ThrowCompletionOr<void> HTMLImageElement::initialize(JS::Realm& realm)
{
MUST_OR_THROW_OOM(Base::initialize(realm));
set_prototype(&Bindings::ensure_web_prototype<Bindings::HTMLImageElementPrototype>(realm, "HTMLImageElement"));
return {};
}
void HTMLImageElement::apply_presentational_hints(CSS::StyleProperties& style) const
{
for_each_attribute([&](auto& name, auto& value) {
if (name == HTML::AttributeNames::width) {
if (auto parsed_value = parse_dimension_value(value))
style.set_property(CSS::PropertyID::Width, parsed_value.release_nonnull());
} else if (name == HTML::AttributeNames::height) {
if (auto parsed_value = parse_dimension_value(value))
style.set_property(CSS::PropertyID::Height, parsed_value.release_nonnull());
} else if (name == HTML::AttributeNames::hspace) {
if (auto parsed_value = parse_dimension_value(value)) {
style.set_property(CSS::PropertyID::MarginLeft, *parsed_value);
style.set_property(CSS::PropertyID::MarginRight, *parsed_value);
}
} else if (name == HTML::AttributeNames::vspace) {
if (auto parsed_value = parse_dimension_value(value)) {
style.set_property(CSS::PropertyID::MarginTop, *parsed_value);
style.set_property(CSS::PropertyID::MarginBottom, *parsed_value);
}
}
});
}
void HTMLImageElement::parse_attribute(DeprecatedFlyString const& name, DeprecatedString const& value)
{
HTMLElement::parse_attribute(name, value);
if (name == HTML::AttributeNames::src && !value.is_empty()) {
m_image_loader.load(document().parse_url(value));
m_load_event_delayer.emplace(document());
}
if (name == HTML::AttributeNames::alt) {
if (layout_node())
verify_cast<Layout::ImageBox>(*layout_node()).dom_node_did_update_alt_text({});
}
}
JS::GCPtr<Layout::Node> HTMLImageElement::create_layout_node(NonnullRefPtr<CSS::StyleProperties> style)
{
return heap().allocate_without_realm<Layout::ImageBox>(document(), *this, move(style), m_image_loader);
}
Gfx::Bitmap const* HTMLImageElement::bitmap() const
{
return m_image_loader.bitmap(m_image_loader.current_frame_index());
}
// https://html.spec.whatwg.org/multipage/embedded-content.html#dom-img-width
unsigned HTMLImageElement::width() const
{
const_cast<DOM::Document&>(document()).update_layout();
// Return the rendered width of the image, in CSS pixels, if the image is being rendered.
if (auto* paint_box = this->paint_box())
return paint_box->content_width().value();
// NOTE: This step seems to not be in the spec, but all browsers do it.
auto width_attr = get_attribute(HTML::AttributeNames::width);
if (auto converted = width_attr.to_uint(); converted.has_value())
return *converted;
// ...or else the density-corrected intrinsic width and height of the image, in CSS pixels,
// if the image has intrinsic dimensions and is available but not being rendered.
if (m_image_loader.has_image())
return m_image_loader.width();
// ...or else 0, if the image is not available or does not have intrinsic dimensions.
return 0;
}
void HTMLImageElement::set_width(unsigned width)
{
MUST(set_attribute(HTML::AttributeNames::width, DeprecatedString::number(width)));
}
// https://html.spec.whatwg.org/multipage/embedded-content.html#dom-img-height
unsigned HTMLImageElement::height() const
{
const_cast<DOM::Document&>(document()).update_layout();
// Return the rendered height of the image, in CSS pixels, if the image is being rendered.
if (auto* paint_box = this->paint_box())
return paint_box->content_height().value();
// NOTE: This step seems to not be in the spec, but all browsers do it.
auto height_attr = get_attribute(HTML::AttributeNames::height);
if (auto converted = height_attr.to_uint(); converted.has_value())
return *converted;
// ...or else the density-corrected intrinsic height and height of the image, in CSS pixels,
// if the image has intrinsic dimensions and is available but not being rendered.
if (m_image_loader.has_image())
return m_image_loader.height();
// ...or else 0, if the image is not available or does not have intrinsic dimensions.
return 0;
}
void HTMLImageElement::set_height(unsigned height)
{
MUST(set_attribute(HTML::AttributeNames::height, DeprecatedString::number(height)));
}
// https://html.spec.whatwg.org/multipage/embedded-content.html#dom-img-naturalwidth
unsigned HTMLImageElement::natural_width() const
{
// Return the density-corrected intrinsic width of the image, in CSS pixels,
// if the image has intrinsic dimensions and is available.
if (m_image_loader.has_image())
return m_image_loader.width();
// ...or else 0.
return 0;
}
// https://html.spec.whatwg.org/multipage/embedded-content.html#dom-img-naturalheight
unsigned HTMLImageElement::natural_height() const
{
// Return the density-corrected intrinsic height of the image, in CSS pixels,
// if the image has intrinsic dimensions and is available.
if (m_image_loader.has_image())
return m_image_loader.height();
// ...or else 0.
return 0;
}
// https://html.spec.whatwg.org/multipage/embedded-content.html#dom-img-complete
bool HTMLImageElement::complete() const
{
// The IDL attribute complete must return true if any of the following conditions is true:
// - Both the src attribute and the srcset attribute are omitted.
if (!has_attribute(HTML::AttributeNames::src) && !has_attribute(HTML::AttributeNames::srcset))
return true;
// - The srcset attribute is omitted and the src attribute's value is the empty string.
if (!has_attribute(HTML::AttributeNames::srcset) && attribute(HTML::AttributeNames::src) == ""sv)
return true;
// - The img element's current request's state is completely available and its pending request is null.
// - The img element's current request's state is broken and its pending request is null.
// FIXME: This is ad-hoc and should be updated once we are loading images via the Fetch mechanism.
if (m_image_loader.has_loaded_or_failed())
return true;
return false;
}
Optional<ARIA::Role> HTMLImageElement::default_role() const
{
// https://www.w3.org/TR/html-aria/#el-img
// https://www.w3.org/TR/html-aria/#el-img-no-alt
if (alt().is_null() || !alt().is_empty())
return ARIA::Role::img;
// https://www.w3.org/TR/html-aria/#el-img-empty-alt
return ARIA::Role::presentation;
}
}
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