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/*
* Copyright (C) 2016-2025 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "ActiveDOMObject.h"
#include "CSSFontFaceSet.h"
#include "EventTarget.h"
#include "EventTargetInterfaces.h"
#include "IDLTypes.h"
#include <wtf/UniqueRef.h>
namespace WebCore {
template<typename IDLType> class DOMPromiseDeferred;
template<typename IDLType> class DOMPromiseProxyWithResolveCallback;
class DOMException;
class FontFaceSet final : public RefCounted<FontFaceSet>, private FontEventClient, public EventTarget, public ActiveDOMObject {
WTF_MAKE_TZONE_ALLOCATED(FontFaceSet);
public:
static Ref<FontFaceSet> create(ScriptExecutionContext&, const Vector<Ref<FontFace>>& initialFaces);
static Ref<FontFaceSet> create(ScriptExecutionContext&, CSSFontFaceSet& backing);
virtual ~FontFaceSet();
// ContextDestructionObserver.
void ref() const final { RefCounted::ref(); }
void deref() const final { RefCounted::deref(); }
USING_CAN_MAKE_WEAKPTR(EventTarget);
bool has(FontFace&) const;
size_t size();
ExceptionOr<FontFaceSet&> add(FontFace&);
bool remove(FontFace&);
void clear();
using LoadPromise = DOMPromiseDeferred<IDLSequence<IDLInterface<FontFace>>>;
void load(ScriptExecutionContext&, const String& font, const String& text, LoadPromise&&);
ExceptionOr<bool> check(ScriptExecutionContext&, const String& font, const String& text);
enum class LoadStatus : bool { Loading, Loaded };
LoadStatus status() const { return m_status; }
using ReadyPromise = DOMPromiseProxyWithResolveCallback<IDLInterface<FontFaceSet>>;
ReadyPromise& ready() { return m_readyPromise.get(); }
void documentDidFinishLoading();
CSSFontFaceSet& backing() { return m_backing; }
class Iterator {
public:
explicit Iterator(FontFaceSet&);
RefPtr<FontFace> next();
private:
Ref<FontFaceSet> m_target;
size_t m_index { 0 }; // FIXME: There needs to be a mechanism to handle when fonts are added or removed from the middle of the FontFaceSet.
};
Iterator createIterator(ScriptExecutionContext*) { return Iterator(*this); }
private:
struct PendingPromise : RefCounted<PendingPromise> {
static Ref<PendingPromise> create(LoadPromise&& promise)
{
return adoptRef(*new PendingPromise(WTF::move(promise)));
}
~PendingPromise();
private:
explicit PendingPromise(LoadPromise&&);
public:
Vector<Ref<FontFace>> faces;
UniqueRef<LoadPromise> promise;
bool hasReachedTerminalState { false };
};
explicit FontFaceSet(ScriptExecutionContext&);
FontFaceSet(ScriptExecutionContext&, CSSFontFaceSet&);
void setInitialState();
bool isPendingOnEnvironment() const;
void stopPendingOnEnvironment();
void switchStateToLoading();
void switchStateToLoaded();
// FontEventClient
void faceDidStartLoading(CSSFontFace&) final;
void faceDidFinishLoading(CSSFontFace&, CSSFontFace::Status) final;
void didAddFace(CSSFontFace&) final;
void didDeletedFace(CSSFontFace&) final;
void startedLoading() final;
void completedLoading() final;
// EventTarget
enum EventTargetInterfaceType eventTargetInterface() const final { return EventTargetInterfaceType::FontFaceSet; }
ScriptExecutionContext* scriptExecutionContext() const final;
using ActiveDOMObject::protectedScriptExecutionContext;
void refEventTarget() final { ref(); }
void derefEventTarget() final { deref(); }
// Callback for ReadyPromise.
FontFaceSet& readyPromiseResolve();
const Ref<CSSFontFaceSet> m_backing;
HashMap<RefPtr<FontFace>, Vector<Ref<PendingPromise>>> m_pendingPromises;
UniqueRef<ReadyPromise> m_readyPromise;
// https://drafts.csswg.org/css-font-loading/#dom-fontfaceset-loadingfonts-slot
HashSet<Ref<FontFace>> m_failedFonts;
HashSet<Ref<FontFace>> m_loadingFonts;
HashSet<Ref<FontFace>> m_loadedFonts;
LoadStatus m_status { LoadStatus::Loaded };
bool m_isStuckOnEnvironment { true };
bool m_isDocumentLoaded { false };
};
} // namespace WebCore
SPECIALIZE_TYPE_TRAITS_EVENTTARGET(FontFaceSet)
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