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/*
* Copyright (C) 2016-2017 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 "CSSFontFace.h"
#include <variant>
#include <wtf/HashMap.h>
#include <wtf/Observer.h>
#include <wtf/Vector.h>
#include <wtf/WeakHashSet.h>
#include <wtf/text/StringHash.h>
namespace WebCore {
class CSSPrimitiveValue;
class CSSSegmentedFontFace;
class FontFaceSet;
template<typename> class ExceptionOr;
class CSSFontFaceSet final : public RefCounted<CSSFontFaceSet>, public CSSFontFace::Client {
public:
static Ref<CSSFontFaceSet> create(CSSFontSelector* owningFontSelector = nullptr)
{
return adoptRef(*new CSSFontFaceSet(owningFontSelector));
}
~CSSFontFaceSet();
using FontModifiedObserver = Observer<void()>;
void addFontModifiedObserver(const FontModifiedObserver&);
struct FontEventClient : public CanMakeWeakPtr<FontEventClient> {
virtual ~FontEventClient() = default;
virtual void faceFinished(CSSFontFace&, CSSFontFace::Status) = 0;
virtual void startedLoading() = 0;
virtual void completedLoading() = 0;
};
void addFontEventClient(const FontEventClient&);
// Calling updateStyleIfNeeded() might delete |this|.
void updateStyleIfNeeded();
bool hasFace(const CSSFontFace&) const;
size_t faceCount() const { return m_faces.size(); }
void add(CSSFontFace&);
void remove(const CSSFontFace&);
void purge();
void emptyCaches();
void clear();
CSSFontFace& operator[](size_t i);
CSSFontFace* lookUpByCSSConnection(StyleRuleFontFace&);
ExceptionOr<bool> check(const String& font, const String& text);
CSSSegmentedFontFace* fontFace(FontSelectionRequest, const AtomString& family);
enum class Status { Loading, Loaded };
Status status() const { return m_status; }
bool hasActiveFontFaces() { return status() == Status::Loading; }
size_t facesPartitionIndex() const { return m_facesPartitionIndex; }
ExceptionOr<Vector<std::reference_wrapper<CSSFontFace>>> matchingFacesExcludingPreinstalledFonts(const String& font, const String& text);
// CSSFontFace::Client needs to be able to be held in a RefPtr.
void ref() final { RefCounted::ref(); }
void deref() final { RefCounted::deref(); }
// FIXME: Should this be implemented?
void updateStyleIfNeeded(CSSFontFace&) final { }
private:
CSSFontFaceSet(CSSFontSelector*);
void removeFromFacesLookupTable(const CSSFontFace&, const CSSValueList& familiesToSearchFor);
void addToFacesLookupTable(CSSFontFace&);
void incrementActiveCount();
void decrementActiveCount();
void fontStateChanged(CSSFontFace&, CSSFontFace::Status oldState, CSSFontFace::Status newState) final;
void fontPropertyChanged(CSSFontFace&, CSSValueList* oldFamilies = nullptr) final;
void ensureLocalFontFacesForFamilyRegistered(const AtomString&);
static String familyNameFromPrimitive(const CSSPrimitiveValue&);
using FontSelectionKey = std::optional<FontSelectionRequest>;
struct FontSelectionKeyHash {
static unsigned hash(const FontSelectionKey& key) { return computeHash(key); }
static bool equal(const FontSelectionKey& a, const FontSelectionKey& b) { return a == b; }
static const bool safeToCompareToEmptyOrDeleted = true;
};
struct FontSelectionKeyHashTraits : SimpleClassHashTraits<FontSelectionKey> {
static const bool emptyValueIsZero = false;
static FontSelectionKey emptyValue() { return FontSelectionRequest { }; }
static void constructDeletedValue(FontSelectionKey& slot) { slot = std::nullopt; }
static bool isDeletedValue(const FontSelectionKey& value) { return !value; }
};
using FontSelectionHashMap = HashMap<FontSelectionKey, RefPtr<CSSSegmentedFontFace>, FontSelectionKeyHash, FontSelectionKeyHashTraits>;
// m_faces should hold all the same fonts as the ones inside inside m_facesLookupTable.
Vector<Ref<CSSFontFace>> m_faces; // We should investigate moving m_faces to FontFaceSet and making it reference FontFaces. This may clean up the font loading design.
HashMap<String, Vector<Ref<CSSFontFace>>, ASCIICaseInsensitiveHash> m_facesLookupTable;
HashMap<String, Vector<Ref<CSSFontFace>>, ASCIICaseInsensitiveHash> m_locallyInstalledFacesLookupTable;
HashMap<String, FontSelectionHashMap, ASCIICaseInsensitiveHash> m_cache;
HashMap<StyleRuleFontFace*, CSSFontFace*> m_constituentCSSConnections;
size_t m_facesPartitionIndex { 0 }; // All entries in m_faces before this index are CSS-connected.
Status m_status { Status::Loaded };
WeakHashSet<FontModifiedObserver> m_fontModifiedObservers;
WeakHashSet<FontEventClient> m_fontEventClients;
WeakPtr<CSSFontSelector> m_owningFontSelector;
unsigned m_activeCount { 0 };
};
}
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