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LibWeb/SVG: Implement SVGImageElement
This element allows images to be embedded within SVGs.
This commit is contained in:
Tim Ledbetter
Andreas Kling
parent
267420d5aa
commit
03bbc2b111
Notes:
github-actions[bot]
2024-08-29 04:29:33 +00:00
Author: https://github.com/tcl3
Commit: 03bbc2b111
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/1198
17 changed files with 490 additions and 8 deletions
217
Userland/Libraries/LibWeb/SVG/SVGImageElement.cpp
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217
Userland/Libraries/LibWeb/SVG/SVGImageElement.cpp
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/*
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* Copyright (c) 2024, 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 <LibJS/Heap/Heap.h>
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#include <LibWeb/Bindings/SVGImageElementPrototype.h>
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#include <LibWeb/DOM/DocumentObserver.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/SVG/SVGDecodedImageData.h>
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namespace Web::SVG {
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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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}
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void SVGImageElement::initialize(JS::Realm& realm)
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{
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Base::initialize(realm);
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WEB_SET_PROTOTYPE_FOR_INTERFACE(SVGImageElement);
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m_document_observer = realm.heap().allocate<DOM::DocumentObserver>(realm, realm, document());
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m_document_observer->set_document_completely_loaded([this]() mutable {
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// FIXME: This is a hack to make SVG images appear when the document has finished loading
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document().invalidate_layout();
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});
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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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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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visitor.visit(m_document_observer);
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}
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void SVGImageElement::attribute_changed(FlyString const& name, Optional<String> const& old_value, Optional<String> const& value)
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{
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SVGGraphicsElement::attribute_changed(name, old_value, value);
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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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process_the_url(value);
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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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JS::NonnullGCPtr<SVG::SVGAnimatedLength> SVGImageElement::x()
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{
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if (!m_x) {
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auto& realm = this->realm();
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m_x = SVGAnimatedLength::create(realm, SVGLength::create(realm, 0, 0), SVGLength::create(realm, 0, 0));
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}
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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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JS::NonnullGCPtr<SVG::SVGAnimatedLength> SVGImageElement::y()
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{
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if (!m_y) {
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auto& realm = this->realm();
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m_y = SVGAnimatedLength::create(realm, SVGLength::create(realm, 0, 0), SVGLength::create(realm, 0, 0));
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}
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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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JS::NonnullGCPtr<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(realm, SVGLength::create(realm, 0, intrinsic_width().value_or(0).to_double()), SVGLength::create(realm, 0, 0));
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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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JS::NonnullGCPtr<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(realm, SVGLength::create(realm, 0, intrinsic_height().value_or(0).to_double()), SVGLength::create(realm, 0, 0));
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}
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return *m_height;
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}
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Gfx::Rect<CSSPixels> SVGImageElement::bounding_box() const
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{
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Optional<CSSPixels> width;
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if (attribute(HTML::AttributeNames::width).has_value())
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width = CSSPixels { m_width->base_val()->value() };
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Optional<CSSPixels> height;
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if (attribute(HTML::AttributeNames::height).has_value())
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height = CSSPixels { 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();
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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();
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if (!width.has_value() && intrinsic_width().has_value())
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width = intrinsic_width();
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if (!height.has_value() && intrinsic_height().has_value())
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height = intrinsic_height();
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return {
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CSSPixels { m_x ? m_x->base_val()->value() : 0 },
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CSSPixels { m_y ? m_y->base_val()->value() : 0 },
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width.value_or(0),
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height.value_or(0),
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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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m_href = document().url().complete_url(href.value_or(String {}));
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if (!m_href.is_valid())
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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] {
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m_load_event_delayer.clear();
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},
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[this] {
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m_load_event_delayer.clear();
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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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JS::GCPtr<Layout::Node> SVGImageElement::create_layout_node(NonnullRefPtr<CSS::StyleProperties> style)
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{
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return heap().allocate_without_realm<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::current_image_bitmap(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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}
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