mirror of
https://github.com/LadybirdBrowser/ladybird
synced 2026-05-03 21:12:08 +02:00
a146225331
Add unsafe_layout_node(), unsafe_paintable(), and unsafe_paintable_box() accessors that skip layout-staleness verification. These are for use in contexts where accessing layout/paintable data is legitimate despite layout not being up to date: tree construction, style recalculation, painting, animation interpolation, DOM mutation, and invalidation propagation. Also add wrapper APIs on Node to centralize common patterns: - set_needs_display() wraps if (unsafe_paintable()) ...set_needs_display - set_needs_paint_only_properties_update() wraps similar - set_needs_layout_update() wraps if (unsafe_layout_node()) ... And add Document::layout_is_up_to_date() which checks whether layout tree update flags are all clear.
297 lines
10 KiB
C++
297 lines
10 KiB
C++
/*
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* Copyright (c) 2024-2025, Tim Ledbetter <tim.ledbetter@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "SVGImageElement.h"
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#include <LibCore/Timer.h>
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#include <LibGC/Heap.h>
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#include <LibGfx/ImmutableBitmap.h>
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#include <LibWeb/Bindings/SVGImageElementPrototype.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/DOM/DocumentObserver.h>
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#include <LibWeb/DOM/Event.h>
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#include <LibWeb/HTML/PotentialCORSRequest.h>
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#include <LibWeb/HTML/SharedResourceRequest.h>
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#include <LibWeb/Layout/SVGImageBox.h>
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#include <LibWeb/Namespace.h>
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#include <LibWeb/Painting/Paintable.h>
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#include <LibWeb/SVG/SVGDecodedImageData.h>
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namespace Web::SVG {
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GC_DEFINE_ALLOCATOR(SVGImageElement);
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SVGImageElement::SVGImageElement(DOM::Document& document, DOM::QualifiedName qualified_name)
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: SVGGraphicsElement(document, move(qualified_name))
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{
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m_animation_timer = Core::Timer::create();
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m_animation_timer->on_timeout = [this] { animate(); };
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}
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SVGImageElement::~SVGImageElement() = default;
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void SVGImageElement::initialize(JS::Realm& realm)
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{
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WEB_SET_PROTOTYPE_FOR_INTERFACE(SVGImageElement);
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Base::initialize(realm);
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}
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void SVGImageElement::visit_edges(Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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image_provider_visit_edges(visitor);
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SVGURIReferenceMixin::visit_edges(visitor);
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visitor.visit(m_x);
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visitor.visit(m_y);
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visitor.visit(m_width);
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visitor.visit(m_height);
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visitor.visit(m_resource_request);
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}
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void SVGImageElement::attribute_changed(FlyString const& name, Optional<String> const& old_value, Optional<String> const& value, Optional<FlyString> const& namespace_)
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{
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Base::attribute_changed(name, old_value, value, namespace_);
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if (name == SVG::AttributeNames::x) {
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auto parsed_value = AttributeParser::parse_coordinate(value.value_or(String {}));
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MUST(x()->base_val()->set_value(parsed_value.value_or(0)));
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} else if (name == SVG::AttributeNames::y) {
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auto parsed_value = AttributeParser::parse_coordinate(value.value_or(String {}));
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MUST(y()->base_val()->set_value(parsed_value.value_or(0)));
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} else if (name == SVG::AttributeNames::width) {
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auto parsed_value = AttributeParser::parse_coordinate(value.value_or(String {}));
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MUST(width()->base_val()->set_value(parsed_value.value_or(0)));
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} else if (name == SVG::AttributeNames::height) {
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auto parsed_value = AttributeParser::parse_coordinate(value.value_or(String {}));
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MUST(height()->base_val()->set_value(parsed_value.value_or(0)));
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} else if (name == SVG::AttributeNames::href) {
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// https://svgwg.org/svg2-draft/linking.html#XLinkRefAttrs
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// For backwards compatibility, elements with an ‘href’ attribute also recognize an ‘href’ attribute in the
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// XLink namespace. If the element is in the XLink namespace, it does not recognize an ‘href’ attribute in the
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// SVG namespace. When the ‘href’ attribute is present in both the XLink namespace and without a namespace, the
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// value of the attribute without a namespace shall be used. The attribute in the XLink namespace shall be ignored.
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if (namespace_ == Namespace::XLink && has_attribute_ns({}, name))
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return;
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auto href = value;
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if (!namespace_.has_value() && !href.has_value())
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href = get_attribute_ns(SVG::AttributeNames::href, Namespace::XLink);
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process_the_url(href);
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}
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}
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// https://svgwg.org/svg2-draft/embedded.html#__svg__SVGImageElement__x
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GC::Ref<SVG::SVGAnimatedLength> SVGImageElement::x()
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{
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if (!m_x)
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m_x = fake_animated_length_fixme();
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return *m_x;
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}
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// https://svgwg.org/svg2-draft/embedded.html#__svg__SVGImageElement__y
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GC::Ref<SVG::SVGAnimatedLength> SVGImageElement::y()
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{
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if (!m_y)
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m_y = fake_animated_length_fixme();
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return *m_y;
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}
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// https://svgwg.org/svg2-draft/embedded.html#__svg__SVGImageElement__width
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GC::Ref<SVG::SVGAnimatedLength> SVGImageElement::width()
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{
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if (!m_width) {
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auto& realm = this->realm();
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m_width = SVGAnimatedLength::create(
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realm,
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SVGLength::create(realm, 0, intrinsic_width().value_or(0).to_double(), SVGLength::ReadOnly::No),
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SVGLength::create(realm, 0, 0, SVGLength::ReadOnly::Yes));
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}
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return *m_width;
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}
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// https://svgwg.org/svg2-draft/embedded.html#__svg__SVGImageElement__height
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GC::Ref<SVG::SVGAnimatedLength> SVGImageElement::height()
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{
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if (!m_height) {
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auto& realm = this->realm();
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m_height = SVGAnimatedLength::create(
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realm,
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SVGLength::create(realm, 0, intrinsic_height().value_or(0).to_double(), SVGLength::ReadOnly::No),
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SVGLength::create(realm, 0, 0, SVGLength::ReadOnly::Yes));
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}
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return *m_height;
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}
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Gfx::FloatRect SVGImageElement::bounding_box() const
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{
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Optional<float> width;
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if (attribute(HTML::AttributeNames::width).has_value())
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width = m_width->base_val()->value();
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Optional<float> height;
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if (attribute(HTML::AttributeNames::height).has_value())
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height = m_height->base_val()->value();
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if (!height.has_value() && width.has_value() && intrinsic_aspect_ratio().has_value())
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height = width.value() / intrinsic_aspect_ratio().value().to_float();
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if (!width.has_value() && height.has_value() && intrinsic_aspect_ratio().has_value())
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width = height.value() * intrinsic_aspect_ratio().value().to_float();
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if (!width.has_value() && intrinsic_width().has_value())
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width = intrinsic_width()->to_float();
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if (!height.has_value() && intrinsic_height().has_value())
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height = intrinsic_height()->to_float();
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return {
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m_x ? m_x->base_val()->value() : 0.0f,
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m_y ? m_y->base_val()->value() : 0.0f,
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width.value_or(0.0f),
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height.value_or(0.0f),
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};
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}
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// https://www.w3.org/TR/SVG2/linking.html#processingURL
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void SVGImageElement::process_the_url(Optional<String> const& href)
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{
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if (!href.has_value()) {
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m_href = {};
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return;
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}
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m_href = document().encoding_parse_url(*href);
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if (!m_href.has_value())
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return;
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fetch_the_document(*m_href);
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}
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// https://svgwg.org/svg2-draft/linking.html#processingURL-fetch
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void SVGImageElement::fetch_the_document(URL::URL const& url)
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{
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m_load_event_delayer.emplace(document());
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m_resource_request = HTML::SharedResourceRequest::get_or_create(realm(), document().page(), url);
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m_resource_request->add_callbacks(
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[this, resource_request = GC::Root { m_resource_request }] {
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m_load_event_delayer.clear();
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auto image_data = resource_request->image_data();
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if (image_data->is_animated() && image_data->frame_count() > 1) {
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m_current_frame_index = 0;
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m_animation_timer->set_interval(image_data->frame_duration(0));
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m_animation_timer->start();
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}
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set_needs_style_update(true);
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set_needs_layout_update(DOM::SetNeedsLayoutReason::SVGImageElementFetchTheDocument);
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dispatch_event(DOM::Event::create(realm(), HTML::EventNames::load));
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},
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[this] {
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m_load_event_delayer.clear();
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dispatch_event(DOM::Event::create(realm(), HTML::EventNames::error));
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});
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if (m_resource_request->needs_fetching()) {
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auto request = HTML::create_potential_CORS_request(vm(), url, Fetch::Infrastructure::Request::Destination::Image, HTML::CORSSettingAttribute::NoCORS);
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request->set_client(&document().relevant_settings_object());
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m_resource_request->fetch_resource(realm(), request);
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}
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}
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GC::Ptr<Layout::Node> SVGImageElement::create_layout_node(GC::Ref<CSS::ComputedProperties> style)
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{
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return heap().allocate<Layout::SVGImageBox>(document(), *this, move(style));
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}
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bool SVGImageElement::is_image_available() const
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{
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return m_resource_request && m_resource_request->image_data();
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}
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Optional<CSSPixels> SVGImageElement::intrinsic_width() const
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{
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if (!m_resource_request)
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return {};
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if (auto image_data = m_resource_request->image_data())
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return image_data->intrinsic_width();
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return {};
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}
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Optional<CSSPixels> SVGImageElement::intrinsic_height() const
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{
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if (!m_resource_request)
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return {};
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if (auto image_data = m_resource_request->image_data())
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return image_data->intrinsic_height();
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return {};
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}
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Optional<CSSPixelFraction> SVGImageElement::intrinsic_aspect_ratio() const
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{
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if (!m_resource_request)
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return {};
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if (auto image_data = m_resource_request->image_data())
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return image_data->intrinsic_aspect_ratio();
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return {};
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}
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RefPtr<Gfx::ImmutableBitmap> SVGImageElement::default_image_bitmap_sized(Gfx::IntSize size) const
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{
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if (!m_resource_request)
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return {};
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if (auto data = m_resource_request->image_data())
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return data->bitmap(0, size);
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return {};
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}
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RefPtr<Gfx::ImmutableBitmap> SVGImageElement::current_image_bitmap_sized(Gfx::IntSize size) const
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{
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if (!m_resource_request)
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return {};
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if (auto data = m_resource_request->image_data())
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return data->bitmap(m_current_frame_index, size);
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return {};
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}
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void SVGImageElement::animate()
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{
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auto image_data = m_resource_request->image_data();
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if (!image_data) {
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return;
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}
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m_current_frame_index = (m_current_frame_index + 1) % image_data->frame_count();
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auto current_frame_duration = image_data->frame_duration(m_current_frame_index);
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if (current_frame_duration != m_animation_timer->interval()) {
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m_animation_timer->restart(current_frame_duration);
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}
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if (m_current_frame_index == image_data->frame_count() - 1) {
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++m_loops_completed;
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if (m_loops_completed > 0 && m_loops_completed == image_data->loop_count()) {
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m_animation_timer->stop();
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}
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}
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if (paintable())
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paintable()->set_needs_display();
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}
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GC::Ptr<HTML::DecodedImageData> SVGImageElement::decoded_image_data() const
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{
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if (!m_resource_request)
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return nullptr;
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return m_resource_request->image_data();
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}
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}
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