LibWeb: Add stub implementation of FontFaceSet and Document.fonts

This is now enough for duolingo to load and use its fallback fonts.
Author: https://github.com/ADKaster Commit: e10721f1b5 Pull-request: https://github.com/SerenityOS/serenity/pull/24255 Issue: https://github.com/SerenityOS/serenity/issues/22014
2025-07-28 11:49:44 +00:00 · 2024-05-07 14:49:31 -06:00 · 2024-05-07 14:49:31 -06:00 · e10721f1b5 · 2024-07-17 05:03:11 +09:00
commit e10721f1b5
parent 2c31d7dddc
13 changed files with 174 additions and 1 deletions
--- a/Userland/Libraries/LibWeb/CSS/FontFaceSet.cpp
+++ b/Userland/Libraries/LibWeb/CSS/FontFaceSet.cpp
@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2024, Andrew Kaster <akaster@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibJS/Heap/Heap.h>
+#include <LibJS/Runtime/Realm.h>
+#include <LibWeb/Bindings/FontFaceSetPrototype.h>
+#include <LibWeb/Bindings/Intrinsics.h>
+#include <LibWeb/CSS/FontFaceSet.h>
+#include <LibWeb/WebIDL/Promise.h>
+
+namespace Web::CSS {
+
+JS_DEFINE_ALLOCATOR(FontFaceSet);
+
+JS::NonnullGCPtr<FontFaceSet> FontFaceSet::construct_impl(JS::Realm& realm, Vector<JS::Handle<FontFace>> initial_faces)
+{
+    return realm.heap().allocate<FontFaceSet>(realm, realm, move(initial_faces));
+}
+
+JS::NonnullGCPtr<FontFaceSet> FontFaceSet::create(JS::Realm& realm)
+{
+    return construct_impl(realm, {});
+}
+
+FontFaceSet::FontFaceSet(JS::Realm& realm, Vector<JS::Handle<FontFace>>)
+    : Bindings::PlatformObject(realm)
+{
+}
+
+void FontFaceSet::initialize(JS::Realm& realm)
+{
+    Base::initialize(realm);
+
+    WEB_SET_PROTOTYPE_FOR_INTERFACE(FontFaceSet);
+}
+
+// https://drafts.csswg.org/css-font-loading/#dom-fontfaceset-add
+JS::NonnullGCPtr<FontFaceSet> FontFaceSet::add(JS::Handle<FontFace>)
+{
+    // FIXME: Do the steps
+    return *this;
+}
+
+// https://drafts.csswg.org/css-font-loading/#dom-fontfaceset-load
+JS::ThrowCompletionOr<JS::NonnullGCPtr<JS::Promise>> FontFaceSet::load(String const&, String const&)
+{
+    // FIXME: Do the steps
+    auto promise = WebIDL::create_rejected_promise(realm(), WebIDL::NotSupportedError::create(realm(), "FontFaceSet::load is not yet implemented"_fly_string));
+    return verify_cast<JS::Promise>(*promise->promise());
+}
+
+}