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d9f12da712
As FontFaces are added or removed from a FontFaceSet, and as they load or fail, the FontFaceSet moves them between a few different lists, and updates its loading/loaded status. In the spec, this is how the FontFaceSet.[[ReadyPromise]] gets fulfilled: When the document has finished loading and FontFaceSet.[[LoadingFonts]] is empty, it resolves the promise. To support this, FontFace now keeps a set of FontFaceSets that it is contained in. This lets us remove the non-spec resolve_ready_promise() call in EventLoop which was sometimes triggering before any fonts had attempted to load. As noted, there's a spec issue with the ready promise: If nothing modifies the document's fonts, then it would never resolve. My ad-hoc fix is to also switch the FontFaceSet to the loaded state if it is empty, which appears to solve the issues but is not ideal.
740 lines
34 KiB
C++
740 lines
34 KiB
C++
/*
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* Copyright (c) 2024, Andrew Kaster <akaster@serenityos.org>
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* Copyright (c) 2025-2026, Sam Atkins <sam@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 <AK/ByteBuffer.h>
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#include <LibCore/Promise.h>
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#include <LibGC/Heap.h>
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#include <LibGfx/Font/FontSupport.h>
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#include <LibGfx/Font/Typeface.h>
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#include <LibGfx/Font/WOFF/Loader.h>
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#include <LibGfx/Font/WOFF2/Loader.h>
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#include <LibJS/Runtime/ArrayBuffer.h>
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#include <LibJS/Runtime/Realm.h>
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#include <LibWeb/Bindings/FontFacePrototype.h>
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#include <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/CSS/CSSFontFaceRule.h>
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#include <LibWeb/CSS/Enums.h>
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#include <LibWeb/CSS/FontComputer.h>
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#include <LibWeb/CSS/FontFace.h>
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#include <LibWeb/CSS/FontFaceSet.h>
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#include <LibWeb/CSS/Parser/Parser.h>
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#include <LibWeb/CSS/StyleValues/CustomIdentStyleValue.h>
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#include <LibWeb/CSS/StyleValues/StringStyleValue.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/HTML/Scripting/TemporaryExecutionContext.h>
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#include <LibWeb/HTML/Window.h>
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#include <LibWeb/Platform/EventLoopPlugin.h>
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#include <LibWeb/WebIDL/AbstractOperations.h>
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#include <LibWeb/WebIDL/Buffers.h>
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#include <LibWeb/WebIDL/Promise.h>
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namespace Web::CSS {
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static NonnullRefPtr<Core::Promise<NonnullRefPtr<Gfx::Typeface const>>> load_vector_font(JS::Realm& realm, ByteBuffer const& data)
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{
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auto promise = Core::Promise<NonnullRefPtr<Gfx::Typeface const>>::construct();
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// FIXME: 'Asynchronously' shouldn't mean 'later on the main thread'.
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// Can we defer this to a background thread?
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Platform::EventLoopPlugin::the().deferred_invoke(GC::create_function(realm.heap(), [&data, promise] {
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// FIXME: This should be de-duplicated with StyleComputer::FontLoader::try_load_font
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// We don't have the luxury of knowing the MIME type, so we have to try all formats.
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auto ttf = Gfx::Typeface::try_load_from_externally_owned_memory(data);
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if (!ttf.is_error()) {
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promise->resolve(ttf.release_value());
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return;
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}
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auto woff = WOFF::try_load_from_bytes(data);
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if (!woff.is_error()) {
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promise->resolve(woff.release_value());
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return;
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}
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auto woff2 = WOFF2::try_load_from_bytes(data);
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if (!woff2.is_error()) {
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promise->resolve(woff2.release_value());
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return;
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}
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promise->reject(Error::from_string_literal("Automatic format detection failed"));
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}));
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return promise;
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}
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GC_DEFINE_ALLOCATOR(FontFace);
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// https://drafts.csswg.org/css-font-loading/#font-face-constructor
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GC::Ref<FontFace> FontFace::construct_impl(JS::Realm& realm, String family, FontFaceSource source, FontFaceDescriptors const& descriptors)
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{
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auto& vm = realm.vm();
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// 1. Let font face be a fresh FontFace object. Set font face’s status attribute to "unloaded",
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// Set its internal [[FontStatusPromise]] slot to a fresh pending Promise object.
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auto font_face = realm.create<FontFace>(realm, WebIDL::create_promise(realm));
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// Parse the family argument, and the members of the descriptors argument,
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// according to the grammars of the corresponding descriptors of the CSS @font-face rule.
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// If the source argument is a CSSOMString, parse it according to the grammar of the CSS src descriptor of the @font-face rule.
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// If any of them fail to parse correctly, reject font face’s [[FontStatusPromise]] with a DOMException named "SyntaxError",
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// set font face’s corresponding attributes to the empty string, and set font face’s status attribute to "error".
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// Otherwise, set font face’s corresponding attributes to the serialization of the parsed values.
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Parser::ParsingParams parsing_params { realm };
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auto try_parse_descriptor = [&parsing_params, &font_face, &realm](DescriptorID descriptor_id, String const& string) -> String {
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auto result = parse_css_descriptor(parsing_params, AtRuleID::FontFace, descriptor_id, string);
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if (!result) {
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font_face->reject_status_promise(WebIDL::SyntaxError::create(realm, Utf16String::formatted("FontFace constructor: Invalid {}", to_string(descriptor_id))));
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return {};
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}
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if (result->is_custom_ident())
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return result->as_custom_ident().custom_ident().to_string();
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return result->to_string(SerializationMode::Normal);
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};
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font_face->m_family = try_parse_descriptor(DescriptorID::FontFamily, family);
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font_face->m_style = try_parse_descriptor(DescriptorID::FontStyle, descriptors.style);
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font_face->m_weight = try_parse_descriptor(DescriptorID::FontWeight, descriptors.weight);
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font_face->m_stretch = try_parse_descriptor(DescriptorID::FontWidth, descriptors.stretch);
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font_face->m_unicode_range = try_parse_descriptor(DescriptorID::UnicodeRange, descriptors.unicode_range);
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font_face->m_feature_settings = try_parse_descriptor(DescriptorID::FontFeatureSettings, descriptors.feature_settings);
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font_face->m_variation_settings = try_parse_descriptor(DescriptorID::FontVariationSettings, descriptors.variation_settings);
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font_face->m_display = try_parse_descriptor(DescriptorID::FontDisplay, descriptors.display);
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font_face->m_ascent_override = try_parse_descriptor(DescriptorID::AscentOverride, descriptors.ascent_override);
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font_face->m_descent_override = try_parse_descriptor(DescriptorID::DescentOverride, descriptors.descent_override);
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font_face->m_line_gap_override = try_parse_descriptor(DescriptorID::LineGapOverride, descriptors.line_gap_override);
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RefPtr<StyleValue const> parsed_source;
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if (auto* source_string = source.get_pointer<String>()) {
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parsed_source = parse_css_descriptor(parsing_params, AtRuleID::FontFace, DescriptorID::Src, *source_string);
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if (!parsed_source) {
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font_face->reject_status_promise(WebIDL::SyntaxError::create(realm, Utf16String::formatted("FontFace constructor: Invalid {}", to_string(DescriptorID::Src))));
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}
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}
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// Return font face. If font face’s status is "error", terminate this algorithm;
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// otherwise, complete the rest of these steps asynchronously.
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// FIXME: Do the rest of this asynchronously.
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if (font_face->status() == Bindings::FontFaceLoadStatus::Error)
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return font_face;
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// 2. If the source argument was a CSSOMString, set font face’s internal [[Urls]] slot to the string.
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// If the source argument was a BinaryData, set font face’s internal [[Data]] slot to the passed argument.
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if (source.has<String>()) {
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font_face->m_urls = ParsedFontFace::sources_from_style_value(*parsed_source);
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} else {
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auto buffer_source = source.get<GC::Root<WebIDL::BufferSource>>();
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auto maybe_buffer = WebIDL::get_buffer_source_copy(buffer_source->raw_object());
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if (maybe_buffer.is_error()) {
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VERIFY(maybe_buffer.error().code() == ENOMEM);
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auto throw_completion = vm.throw_completion<JS::InternalError>(vm.error_message(JS::VM::ErrorMessage::OutOfMemory));
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font_face->reject_status_promise(throw_completion.value());
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} else {
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font_face->m_binary_data = maybe_buffer.release_value();
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}
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}
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if (font_face->m_binary_data.is_empty() && font_face->m_urls.is_empty())
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font_face->reject_status_promise(WebIDL::SyntaxError::create(realm, "FontFace constructor: Invalid font source"_utf16));
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// 3. If font face’s [[Data]] slot is not null, queue a task to run the following steps synchronously:
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if (font_face->m_binary_data.is_empty())
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return font_face;
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HTML::queue_global_task(HTML::Task::Source::FontLoading, HTML::relevant_global_object(*font_face), GC::create_function(vm.heap(), [&realm, font_face] {
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// 1. Set font face’s status attribute to "loading".
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font_face->m_status = Bindings::FontFaceLoadStatus::Loading;
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// 2. For each FontFaceSet font face is in:
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for (auto& font_face_set : font_face->m_containing_sets) {
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// 1. If the FontFaceSet’s [[LoadingFonts]] list is empty, switch the FontFaceSet to loading.
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if (font_face_set->loading_fonts().is_empty())
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font_face_set->switch_to_loading();
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// 2. Append font face to the FontFaceSet’s [[LoadingFonts]] list.
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font_face_set->loading_fonts().append(font_face);
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}
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// 3. Asynchronously, attempt to parse the data in it as a font.
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// When this is completed, successfully or not, queue a task to run the following steps synchronously:
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font_face->m_font_load_promise = load_vector_font(realm, font_face->m_binary_data);
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font_face->m_font_load_promise->when_resolved([font = GC::make_root(font_face)](auto const& vector_font) -> ErrorOr<void> {
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HTML::queue_global_task(HTML::Task::Source::FontLoading, HTML::relevant_global_object(*font), GC::create_function(font->heap(), [font = GC::Ref(*font), vector_font] {
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HTML::TemporaryExecutionContext context(font->realm(), HTML::TemporaryExecutionContext::CallbacksEnabled::Yes);
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// 1. If the load was successful, font face now represents the parsed font;
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// fulfill font face’s [[FontStatusPromise]] with font face, and set its status attribute to "loaded".
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// FIXME: Are we supposed to set the properties of the FontFace based on the loaded vector font?
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font->m_parsed_font = vector_font;
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font->m_status = Bindings::FontFaceLoadStatus::Loaded;
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WebIDL::resolve_promise(font->realm(), font->m_font_status_promise, font);
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// For each FontFaceSet font face is in:
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for (auto& font_face_set : font->m_containing_sets) {
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// 1. Add font face to the FontFaceSet’s [[LoadedFonts]] list.
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font_face_set->loaded_fonts().append(font);
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// 2. Remove font face from the FontFaceSet’s [[LoadingFonts]] list. If font was the last item in
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// that list (and so the list is now empty), switch the FontFaceSet to loaded.
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font_face_set->loading_fonts().remove_all_matching([font](auto const& entry) { return entry == font; });
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if (font_face_set->loading_fonts().is_empty())
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font_face_set->switch_to_loaded();
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}
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font->m_font_load_promise = nullptr;
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}));
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return {};
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});
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font_face->m_font_load_promise->when_rejected([font = GC::make_root(font_face)](auto const& error) {
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HTML::queue_global_task(HTML::Task::Source::FontLoading, HTML::relevant_global_object(*font), GC::create_function(font->heap(), [font = GC::Ref(*font), error = Error::copy(error)] {
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HTML::TemporaryExecutionContext context(font->realm(), HTML::TemporaryExecutionContext::CallbacksEnabled::Yes);
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// 2. Otherwise, reject font face’s [[FontStatusPromise]] with a DOMException named "SyntaxError"
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// and set font face’s status attribute to "error".
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font->reject_status_promise(WebIDL::SyntaxError::create(font->realm(), Utf16String::formatted("Failed to load font: {}", error)));
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// For each FontFaceSet font face is in:
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for (auto& font_face_set : font->m_containing_sets) {
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// 1. Add font face to the FontFaceSet’s [[FailedFonts]] list.
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font_face_set->failed_fonts().append(font);
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// 2. Remove font face from the FontFaceSet’s [[LoadingFonts]] list. If font was the last item in
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// that list (and so the list is now empty), switch the FontFaceSet to loaded.
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font_face_set->loading_fonts().remove_all_matching([font](auto const& entry) { return entry == font; });
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if (font_face_set->loading_fonts().is_empty())
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font_face_set->switch_to_loaded();
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}
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font->m_font_load_promise = nullptr;
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}));
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});
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}));
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return font_face;
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}
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// https://drafts.csswg.org/css-font-loading/#font-face-css-connection
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GC::Ref<FontFace> FontFace::create_css_connected(JS::Realm& realm, CSSFontFaceRule& rule)
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{
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HTML::TemporaryExecutionContext execution_context { realm };
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auto font_face = realm.create<FontFace>(realm, WebIDL::create_promise(realm));
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font_face->m_css_font_face_rule = &rule;
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font_face->reparse_connected_css_font_face_rule_descriptors();
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if (auto src_value = rule.descriptors()->descriptor(DescriptorID::Src))
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font_face->m_urls = ParsedFontFace::sources_from_style_value(*src_value);
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rule.set_css_connected_font_face(font_face);
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return font_face;
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}
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void FontFace::reparse_connected_css_font_face_rule_descriptors()
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{
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auto const& descriptors = m_css_font_face_rule->descriptors();
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set_family_impl(*descriptors->descriptor(DescriptorID::FontFamily));
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set_style_impl(*descriptors->descriptor_or_initial_value(DescriptorID::FontStyle));
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set_weight_impl(*descriptors->descriptor_or_initial_value(DescriptorID::FontWeight));
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set_stretch_impl(*descriptors->descriptor_or_initial_value(DescriptorID::FontWidth));
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set_unicode_range_impl(*descriptors->descriptor_or_initial_value(DescriptorID::UnicodeRange));
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set_feature_settings_impl(*descriptors->descriptor_or_initial_value(DescriptorID::FontFeatureSettings));
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set_variation_settings_impl(*descriptors->descriptor_or_initial_value(DescriptorID::FontVariationSettings));
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set_display_impl(*descriptors->descriptor_or_initial_value(DescriptorID::FontDisplay));
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set_ascent_override_impl(*descriptors->descriptor_or_initial_value(DescriptorID::AscentOverride));
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set_descent_override_impl(*descriptors->descriptor_or_initial_value(DescriptorID::DescentOverride));
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set_line_gap_override_impl(*descriptors->descriptor_or_initial_value(DescriptorID::LineGapOverride));
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}
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ParsedFontFace FontFace::parsed_font_face() const
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{
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if (m_css_font_face_rule)
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return m_css_font_face_rule->font_face();
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// FIXME: The ParsedFontFace is kind of expensive to create. We should be using a shared sub-object for the data
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return ParsedFontFace {
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// Create a dummy CSSFontFaceRule so that we load relative to the document's base URL
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CSSFontFaceRule::create(realm(), CSSFontFaceDescriptors::create(realm(), {})),
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m_family,
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// FIXME: Actually parse this as we're supposed to.
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m_weight.to_number<int>().map([](auto weight) { return FontWeightRange { weight, weight }; }),
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0, // FIXME: slope
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Gfx::FontWidth::Normal, // FIXME: width
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m_urls,
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m_unicode_ranges,
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{}, // FIXME: ascent_override
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{}, // FIXME: descent_override
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{}, // FIXME: line_gap_override
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FontDisplay::Auto, // FIXME: font_display
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{}, // font-named-instance doesn't exist in FontFace
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{}, // font-language-override doesn't exist in FontFace
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{}, // FIXME: feature_settings
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{}, // FIXME: variation_settings
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};
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}
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FontFace::FontFace(JS::Realm& realm, GC::Ref<WebIDL::Promise> font_status_promise)
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: Bindings::PlatformObject(realm)
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, m_font_status_promise(font_status_promise)
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{
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}
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FontFace::~FontFace() = default;
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void FontFace::initialize(JS::Realm& realm)
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{
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WEB_SET_PROTOTYPE_FOR_INTERFACE(FontFace);
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Base::initialize(realm);
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}
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void FontFace::visit_edges(JS::Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_font_status_promise);
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visitor.visit(m_css_font_face_rule);
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for (auto const& font_face_set : m_containing_sets)
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visitor.visit(font_face_set);
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}
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GC::Ref<WebIDL::Promise> FontFace::loaded() const
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{
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return m_font_status_promise;
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}
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void FontFace::reject_status_promise(JS::Value reason)
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{
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if (m_status != Bindings::FontFaceLoadStatus::Error) {
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WebIDL::reject_promise(realm(), m_font_status_promise, reason);
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WebIDL::mark_promise_as_handled(m_font_status_promise);
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m_status = Bindings::FontFaceLoadStatus::Error;
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}
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}
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void FontFace::disconnect_from_css_rule()
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{
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m_css_font_face_rule = nullptr;
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}
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// https://drafts.csswg.org/css-font-loading/#dom-fontface-family
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WebIDL::ExceptionOr<void> FontFace::set_family(String const& string)
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{
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// On setting, parse the string according to the grammar for the corresponding @font-face descriptor.
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// If it does not match the grammar, throw a SyntaxError; otherwise, set the attribute to the serialization of the
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// parsed value.
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auto property = parse_css_descriptor(Parser::ParsingParams(), AtRuleID::FontFace, DescriptorID::FontFamily, string);
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if (!property)
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return WebIDL::SyntaxError::create(realm(), "FontFace.family setter: Invalid descriptor value"_utf16);
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if (m_css_font_face_rule)
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TRY(m_css_font_face_rule->descriptors()->set_font_family(string));
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set_family_impl(property.release_nonnull());
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return {};
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}
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void FontFace::set_family_impl(NonnullRefPtr<StyleValue const> const& value)
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{
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m_family = string_from_style_value(value).to_string();
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}
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// https://drafts.csswg.org/css-font-loading/#dom-fontface-style
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WebIDL::ExceptionOr<void> FontFace::set_style(String const& string)
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{
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// On setting, parse the string according to the grammar for the corresponding @font-face descriptor.
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// If it does not match the grammar, throw a SyntaxError; otherwise, set the attribute to the serialization of the
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// parsed value.
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auto property = parse_css_descriptor(Parser::ParsingParams(), AtRuleID::FontFace, DescriptorID::FontStyle, string);
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if (!property)
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return WebIDL::SyntaxError::create(realm(), "FontFace.style setter: Invalid descriptor value"_utf16);
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if (m_css_font_face_rule)
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TRY(m_css_font_face_rule->descriptors()->set_font_style(string));
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set_style_impl(property.release_nonnull());
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return {};
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}
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void FontFace::set_style_impl(NonnullRefPtr<StyleValue const> const& value)
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{
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m_style = value->to_string(SerializationMode::Normal);
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}
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// https://drafts.csswg.org/css-font-loading/#dom-fontface-weight
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WebIDL::ExceptionOr<void> FontFace::set_weight(String const& string)
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{
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// On setting, parse the string according to the grammar for the corresponding @font-face descriptor.
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// If it does not match the grammar, throw a SyntaxError; otherwise, set the attribute to the serialization of the
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// parsed value.
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auto property = parse_css_descriptor(Parser::ParsingParams(), AtRuleID::FontFace, DescriptorID::FontWeight, string);
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if (!property)
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return WebIDL::SyntaxError::create(realm(), "FontFace.weight setter: Invalid descriptor value"_utf16);
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if (m_css_font_face_rule)
|
||
TRY(m_css_font_face_rule->descriptors()->set_font_weight(string));
|
||
|
||
set_weight_impl(property.release_nonnull());
|
||
|
||
return {};
|
||
}
|
||
|
||
void FontFace::set_weight_impl(NonnullRefPtr<StyleValue const> const& value)
|
||
{
|
||
m_weight = value->to_string(SerializationMode::Normal);
|
||
}
|
||
|
||
// https://drafts.csswg.org/css-font-loading/#dom-fontface-stretch
|
||
WebIDL::ExceptionOr<void> FontFace::set_stretch(String const& string)
|
||
{
|
||
// On setting, parse the string according to the grammar for the corresponding @font-face descriptor.
|
||
// If it does not match the grammar, throw a SyntaxError; otherwise, set the attribute to the serialization of the
|
||
// parsed value.
|
||
|
||
// NOTE: font-stretch is now an alias for font-width
|
||
auto property = parse_css_descriptor(Parser::ParsingParams(), AtRuleID::FontFace, DescriptorID::FontWidth, string);
|
||
if (!property)
|
||
return WebIDL::SyntaxError::create(realm(), "FontFace.stretch setter: Invalid descriptor value"_utf16);
|
||
|
||
if (m_css_font_face_rule)
|
||
TRY(m_css_font_face_rule->descriptors()->set_font_width(string));
|
||
|
||
set_stretch_impl(property.release_nonnull());
|
||
|
||
return {};
|
||
}
|
||
|
||
void FontFace::set_stretch_impl(NonnullRefPtr<StyleValue const> const& value)
|
||
{
|
||
m_stretch = value->to_string(SerializationMode::Normal);
|
||
}
|
||
|
||
// https://drafts.csswg.org/css-font-loading/#dom-fontface-unicoderange
|
||
WebIDL::ExceptionOr<void> FontFace::set_unicode_range(String const& string)
|
||
{
|
||
// On setting, parse the string according to the grammar for the corresponding @font-face descriptor.
|
||
// If it does not match the grammar, throw a SyntaxError; otherwise, set the attribute to the serialization of the
|
||
// parsed value.
|
||
|
||
auto property = parse_css_descriptor(Parser::ParsingParams(), AtRuleID::FontFace, DescriptorID::UnicodeRange, string);
|
||
if (!property)
|
||
return WebIDL::SyntaxError::create(realm(), "FontFace.unicodeRange setter: Invalid descriptor value"_utf16);
|
||
|
||
if (m_css_font_face_rule)
|
||
TRY(m_css_font_face_rule->descriptors()->set_unicode_range(string));
|
||
|
||
set_unicode_range_impl(property.release_nonnull());
|
||
|
||
return {};
|
||
}
|
||
|
||
void FontFace::set_unicode_range_impl(NonnullRefPtr<StyleValue const> const& value)
|
||
{
|
||
m_unicode_range = value->to_string(SerializationMode::Normal);
|
||
}
|
||
|
||
// https://drafts.csswg.org/css-font-loading/#dom-fontface-featuresettings
|
||
WebIDL::ExceptionOr<void> FontFace::set_feature_settings(String const& string)
|
||
{
|
||
// On setting, parse the string according to the grammar for the corresponding @font-face descriptor.
|
||
// If it does not match the grammar, throw a SyntaxError; otherwise, set the attribute to the serialization of the
|
||
// parsed value.
|
||
|
||
auto property = parse_css_descriptor(Parser::ParsingParams(), AtRuleID::FontFace, DescriptorID::FontFeatureSettings, string);
|
||
if (!property)
|
||
return WebIDL::SyntaxError::create(realm(), "FontFace.featureSettings setter: Invalid descriptor value"_utf16);
|
||
|
||
if (m_css_font_face_rule)
|
||
TRY(m_css_font_face_rule->descriptors()->set_font_feature_settings(string));
|
||
|
||
set_feature_settings_impl(property.release_nonnull());
|
||
|
||
return {};
|
||
}
|
||
|
||
void FontFace::set_feature_settings_impl(NonnullRefPtr<StyleValue const> const& value)
|
||
{
|
||
m_feature_settings = value->to_string(SerializationMode::Normal);
|
||
}
|
||
|
||
// https://drafts.csswg.org/css-font-loading/#dom-fontface-variationsettings
|
||
WebIDL::ExceptionOr<void> FontFace::set_variation_settings(String const& string)
|
||
{
|
||
// On setting, parse the string according to the grammar for the corresponding @font-face descriptor.
|
||
// If it does not match the grammar, throw a SyntaxError; otherwise, set the attribute to the serialization of the
|
||
// parsed value.
|
||
|
||
auto property = parse_css_descriptor(Parser::ParsingParams(), AtRuleID::FontFace, DescriptorID::FontVariationSettings, string);
|
||
if (!property)
|
||
return WebIDL::SyntaxError::create(realm(), "FontFace.variationSettings setter: Invalid descriptor value"_utf16);
|
||
|
||
if (m_css_font_face_rule)
|
||
TRY(m_css_font_face_rule->descriptors()->set_font_variation_settings(string));
|
||
|
||
set_variation_settings_impl(property.release_nonnull());
|
||
|
||
return {};
|
||
}
|
||
|
||
void FontFace::set_variation_settings_impl(NonnullRefPtr<StyleValue const> const& value)
|
||
{
|
||
m_variation_settings = value->to_string(SerializationMode::Normal);
|
||
}
|
||
|
||
// https://drafts.csswg.org/css-font-loading/#dom-fontface-display
|
||
WebIDL::ExceptionOr<void> FontFace::set_display(String const& string)
|
||
{
|
||
// On setting, parse the string according to the grammar for the corresponding @font-face descriptor.
|
||
// If it does not match the grammar, throw a SyntaxError; otherwise, set the attribute to the serialization of the
|
||
// parsed value.
|
||
|
||
auto property = parse_css_descriptor(Parser::ParsingParams(), AtRuleID::FontFace, DescriptorID::FontDisplay, string);
|
||
if (!property)
|
||
return WebIDL::SyntaxError::create(realm(), "FontFace.display setter: Invalid descriptor value"_utf16);
|
||
|
||
if (m_css_font_face_rule)
|
||
TRY(m_css_font_face_rule->descriptors()->set_font_display(string));
|
||
|
||
set_display_impl(property.release_nonnull());
|
||
|
||
return {};
|
||
}
|
||
|
||
void FontFace::set_display_impl(NonnullRefPtr<StyleValue const> const& value)
|
||
{
|
||
m_display = value->to_string(SerializationMode::Normal);
|
||
}
|
||
|
||
// https://drafts.csswg.org/css-font-loading/#dom-fontface-ascentoverride
|
||
WebIDL::ExceptionOr<void> FontFace::set_ascent_override(String const& string)
|
||
{
|
||
// On setting, parse the string according to the grammar for the corresponding @font-face descriptor.
|
||
// If it does not match the grammar, throw a SyntaxError; otherwise, set the attribute to the serialization of the
|
||
// parsed value.
|
||
|
||
auto property = parse_css_descriptor(Parser::ParsingParams(), AtRuleID::FontFace, DescriptorID::AscentOverride, string);
|
||
if (!property)
|
||
return WebIDL::SyntaxError::create(realm(), "FontFace.ascentOverride setter: Invalid descriptor value"_utf16);
|
||
|
||
if (m_css_font_face_rule)
|
||
TRY(m_css_font_face_rule->descriptors()->set_ascent_override(string));
|
||
|
||
set_ascent_override_impl(property.release_nonnull());
|
||
|
||
return {};
|
||
}
|
||
|
||
void FontFace::set_ascent_override_impl(NonnullRefPtr<StyleValue const> const& value)
|
||
{
|
||
m_ascent_override = value->to_string(SerializationMode::Normal);
|
||
}
|
||
|
||
// https://drafts.csswg.org/css-font-loading/#dom-fontface-descentoverride
|
||
WebIDL::ExceptionOr<void> FontFace::set_descent_override(String const& string)
|
||
{
|
||
// On setting, parse the string according to the grammar for the corresponding @font-face descriptor.
|
||
// If it does not match the grammar, throw a SyntaxError; otherwise, set the attribute to the serialization of the
|
||
// parsed value.
|
||
|
||
auto property = parse_css_descriptor(Parser::ParsingParams(), AtRuleID::FontFace, DescriptorID::DescentOverride, string);
|
||
if (!property)
|
||
return WebIDL::SyntaxError::create(realm(), "FontFace.descentOverride setter: Invalid descriptor value"_utf16);
|
||
|
||
if (m_css_font_face_rule)
|
||
TRY(m_css_font_face_rule->descriptors()->set_descent_override(string));
|
||
|
||
set_descent_override_impl(property.release_nonnull());
|
||
|
||
return {};
|
||
}
|
||
|
||
void FontFace::set_descent_override_impl(NonnullRefPtr<StyleValue const> const& value)
|
||
{
|
||
m_descent_override = value->to_string(SerializationMode::Normal);
|
||
}
|
||
|
||
// https://drafts.csswg.org/css-font-loading/#dom-fontface-linegapoverride
|
||
WebIDL::ExceptionOr<void> FontFace::set_line_gap_override(String const& string)
|
||
{
|
||
// On setting, parse the string according to the grammar for the corresponding @font-face descriptor.
|
||
// If it does not match the grammar, throw a SyntaxError; otherwise, set the attribute to the serialization of the
|
||
// parsed value.
|
||
|
||
auto property = parse_css_descriptor(Parser::ParsingParams(), AtRuleID::FontFace, DescriptorID::LineGapOverride, string);
|
||
if (!property)
|
||
return WebIDL::SyntaxError::create(realm(), "FontFace.lineGapOverride setter: Invalid descriptor value"_utf16);
|
||
|
||
if (m_css_font_face_rule)
|
||
TRY(m_css_font_face_rule->descriptors()->set_line_gap_override(string));
|
||
|
||
set_line_gap_override_impl(property.release_nonnull());
|
||
|
||
return {};
|
||
}
|
||
|
||
void FontFace::set_line_gap_override_impl(NonnullRefPtr<StyleValue const> const& value)
|
||
{
|
||
m_line_gap_override = value->to_string(SerializationMode::Normal);
|
||
}
|
||
|
||
// https://drafts.csswg.org/css-font-loading/#dom-fontface-load
|
||
GC::Ref<WebIDL::Promise> FontFace::load()
|
||
{
|
||
// 1. Let font face be the FontFace object on which this method was called.
|
||
auto& font_face = *this;
|
||
|
||
// 2. If font face’s [[Urls]] slot is null, or its status attribute is anything other than "unloaded",
|
||
// return font face’s [[FontStatusPromise]] and abort these steps.
|
||
if (font_face.m_urls.is_empty() || font_face.m_status != Bindings::FontFaceLoadStatus::Unloaded)
|
||
return font_face.loaded();
|
||
|
||
// 3. Otherwise, set font face’s status attribute to "loading", return font face’s [[FontStatusPromise]],
|
||
// and continue executing the rest of this algorithm asynchronously.
|
||
m_status = Bindings::FontFaceLoadStatus::Loading;
|
||
|
||
Web::Platform::EventLoopPlugin::the().deferred_invoke(GC::create_function(heap(), [this] {
|
||
// 4. Using the value of font face’s [[Urls]] slot, attempt to load a font as defined in [CSS-FONTS-3],
|
||
// as if it was the value of a @font-face rule’s src descriptor.
|
||
|
||
// 5. When the load operation completes, successfully or not, queue a task to run the following steps synchronously:
|
||
auto on_load = GC::create_function(heap(), [this](RefPtr<Gfx::Typeface const> maybe_typeface) {
|
||
HTML::queue_global_task(HTML::Task::Source::FontLoading, HTML::relevant_global_object(*this), GC::create_function(heap(), [this, maybe_typeface] {
|
||
HTML::TemporaryExecutionContext context(realm(), HTML::TemporaryExecutionContext::CallbacksEnabled::Yes);
|
||
// 1. If the attempt to load fails, reject font face’s [[FontStatusPromise]] with a DOMException whose name
|
||
// is "NetworkError" and set font face’s status attribute to "error".
|
||
if (!maybe_typeface) {
|
||
m_status = Bindings::FontFaceLoadStatus::Error;
|
||
WebIDL::reject_promise(realm(), m_font_status_promise, WebIDL::NetworkError::create(realm(), "Failed to load font"_utf16));
|
||
|
||
// For each FontFaceSet font face is in:
|
||
for (auto& font_face_set : m_containing_sets) {
|
||
// 1. Add font face to the FontFaceSet’s [[FailedFonts]] list.
|
||
font_face_set->failed_fonts().append(*this);
|
||
|
||
// 2. Remove font face from the FontFaceSet’s [[LoadingFonts]] list. If font was the last item
|
||
// in that list (and so the list is now empty), switch the FontFaceSet to loaded.
|
||
font_face_set->loading_fonts().remove_all_matching([this](auto const& entry) { return entry == this; });
|
||
if (font_face_set->loading_fonts().is_empty())
|
||
font_face_set->switch_to_loaded();
|
||
}
|
||
}
|
||
|
||
// 2. Otherwise, font face now represents the loaded font; fulfill font face’s [[FontStatusPromise]] with font face
|
||
// and set font face’s status attribute to "loaded".
|
||
else {
|
||
m_parsed_font = maybe_typeface;
|
||
m_status = Bindings::FontFaceLoadStatus::Loaded;
|
||
WebIDL::resolve_promise(realm(), m_font_status_promise, this);
|
||
|
||
// For each FontFaceSet font face is in:
|
||
for (auto& font_face_set : m_containing_sets) {
|
||
// 1. Add font face to the FontFaceSet’s [[LoadedFonts]] list.
|
||
font_face_set->loaded_fonts().append(*this);
|
||
|
||
// 2. Remove font face from the FontFaceSet’s [[LoadingFonts]] list. If font was the last item
|
||
// in that list (and so the list is now empty), switch the FontFaceSet to loaded.
|
||
font_face_set->loading_fonts().remove_all_matching([this](auto const& entry) { return entry == this; });
|
||
if (font_face_set->loading_fonts().is_empty())
|
||
font_face_set->switch_to_loaded();
|
||
}
|
||
}
|
||
}));
|
||
});
|
||
|
||
// FIXME: We should probably put the 'font cache' on the WindowOrWorkerGlobalScope instead of tying it to the document's style computer
|
||
auto& global = HTML::relevant_global_object(*this);
|
||
if (auto* window = as_if<HTML::Window>(global)) {
|
||
auto& font_computer = const_cast<FontComputer&>(window->document()->font_computer());
|
||
|
||
if (auto loader = font_computer.load_font_face(parsed_font_face(), move(on_load)))
|
||
loader->start_loading_next_url();
|
||
} else {
|
||
// FIXME: Don't know how to load fonts in workers! They don't have a StyleComputer
|
||
dbgln("FIXME: Worker font loading not implemented");
|
||
}
|
||
}));
|
||
|
||
return font_face.loaded();
|
||
}
|
||
|
||
void FontFace::add_to_set(FontFaceSet& set)
|
||
{
|
||
m_containing_sets.set(set);
|
||
}
|
||
|
||
void FontFace::remove_from_set(FontFaceSet& set)
|
||
{
|
||
m_containing_sets.remove(set);
|
||
}
|
||
|
||
bool font_format_is_supported(FlyString const& name)
|
||
{
|
||
// https://drafts.csswg.org/css-fonts-4/#font-format-definitions
|
||
if (name.equals_ignoring_ascii_case("collection"sv))
|
||
return Gfx::font_format_is_supported(Gfx::FontFormat::TrueTypeCollection);
|
||
if (name.equals_ignoring_ascii_case("embedded-opentype"sv))
|
||
return Gfx::font_format_is_supported(Gfx::FontFormat::EmbeddedOpenType);
|
||
if (name.equals_ignoring_ascii_case("opentype"sv))
|
||
return Gfx::font_format_is_supported(Gfx::FontFormat::OpenType);
|
||
if (name.equals_ignoring_ascii_case("svg"sv))
|
||
return Gfx::font_format_is_supported(Gfx::FontFormat::SVG);
|
||
if (name.equals_ignoring_ascii_case("truetype"sv))
|
||
return Gfx::font_format_is_supported(Gfx::FontFormat::TrueType);
|
||
if (name.equals_ignoring_ascii_case("woff"sv))
|
||
return Gfx::font_format_is_supported(Gfx::FontFormat::WOFF);
|
||
if (name.equals_ignoring_ascii_case("woff2"sv))
|
||
return Gfx::font_format_is_supported(Gfx::FontFormat::WOFF2);
|
||
return false;
|
||
}
|
||
|
||
bool font_tech_is_supported(FontTech font_tech)
|
||
{
|
||
// https://drafts.csswg.org/css-fonts-4/#font-tech-definitions
|
||
switch (font_tech) {
|
||
case FontTech::FeaturesOpentype:
|
||
return Gfx::font_tech_is_supported(Gfx::FontTech::FeaturesOpentype);
|
||
case FontTech::FeaturesAat:
|
||
return Gfx::font_tech_is_supported(Gfx::FontTech::FeaturesAat);
|
||
case FontTech::FeaturesGraphite:
|
||
return Gfx::font_tech_is_supported(Gfx::FontTech::FeaturesGraphite);
|
||
case FontTech::Variations:
|
||
return Gfx::font_tech_is_supported(Gfx::FontTech::Variations);
|
||
case FontTech::ColorColrv0:
|
||
return Gfx::font_tech_is_supported(Gfx::FontTech::ColorColrv0);
|
||
case FontTech::ColorColrv1:
|
||
return Gfx::font_tech_is_supported(Gfx::FontTech::ColorColrv1);
|
||
case FontTech::ColorSvg:
|
||
return Gfx::font_tech_is_supported(Gfx::FontTech::ColorSvg);
|
||
case FontTech::ColorSbix:
|
||
return Gfx::font_tech_is_supported(Gfx::FontTech::ColorSbix);
|
||
case FontTech::ColorCbdt:
|
||
return Gfx::font_tech_is_supported(Gfx::FontTech::ColorCbdt);
|
||
case FontTech::Palettes:
|
||
return Gfx::font_tech_is_supported(Gfx::FontTech::Palettes);
|
||
case FontTech::Incremental:
|
||
return Gfx::font_tech_is_supported(Gfx::FontTech::Incremental);
|
||
// https://drafts.csswg.org/css-fonts-5/#font-tech-definitions
|
||
case FontTech::Avar2:
|
||
return Gfx::font_tech_is_supported(Gfx::FontTech::Avar2);
|
||
}
|
||
return false;
|
||
}
|
||
|
||
bool font_tech_is_supported(FlyString const& name)
|
||
{
|
||
if (auto keyword = keyword_from_string(name); keyword.has_value()) {
|
||
if (auto font_tech = keyword_to_font_tech(*keyword); font_tech.has_value()) {
|
||
return font_tech_is_supported(*font_tech);
|
||
}
|
||
}
|
||
return false;
|
||
}
|
||
|
||
}
|