1 files changed, 539 insertions, 95 deletions

diff --git a/Source/WebCore/css/CSSFontFace.cpp b/Source/WebCore/css/CSSFontFace.cpp
index f8eab28e0..9bae31cdd 100644
--- a/Source/WebCore/css/CSSFontFace.cpp
+++ b/Source/WebCore/css/CSSFontFace.cpp
@@ -10,10 +10,10 @@
  *    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 COMPUTER, INC. ``AS IS'' AND ANY
+ * 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 COMPUTER, INC. OR
+ * 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
@@ -27,155 +27,599 @@
 #include "CSSFontFace.h"
 
 #include "CSSFontFaceSource.h"
+#include "CSSFontFaceSrcValue.h"
+#include "CSSFontFamily.h"
+#include "CSSFontFeatureValue.h"
 #include "CSSFontSelector.h"
+#include "CSSPrimitiveValueMappings.h"
 #include "CSSSegmentedFontFace.h"
+#include "CSSUnicodeRangeValue.h"
+#include "CSSValue.h"
+#include "CSSValueList.h"
 #include "Document.h"
+#include "Font.h"
 #include "FontDescription.h"
-#include "FontLoader.h"
+#include "FontFace.h"
+#include "FontVariantBuilder.h"
 #include "RuntimeEnabledFeatures.h"
-#include "SimpleFontData.h"
+#include "Settings.h"
+#include "StyleProperties.h"
+#include "StyleRule.h"
 
 namespace WebCore {
 
-bool CSSFontFace::isLoaded() const
+template<typename T> void iterateClients(HashSet<CSSFontFace::Client*>& clients, T callback)
 {
-    size_t size = m_sources.size();
-    for (size_t i = 0; i < size; i++) {
-        if (!m_sources[i]->isLoaded())
-            return false;
+    Vector<Ref<CSSFontFace::Client>> clientsCopy;
+    clientsCopy.reserveInitialCapacity(clients.size());
+    for (auto* client : clients)
+        clientsCopy.uncheckedAppend(*client);
+
+    for (auto* client : clients)
+        callback(*client);
+}
+
+void CSSFontFace::appendSources(CSSFontFace& fontFace, CSSValueList& srcList, Document* document, bool isInitiatingElementInUserAgentShadowTree)
+{
+    for (auto& src : srcList) {
+        // An item in the list either specifies a string (local font name) or a URL (remote font to download).
+        CSSFontFaceSrcValue& item = downcast<CSSFontFaceSrcValue>(src.get());
+        std::unique_ptr<CSSFontFaceSource> source;
+        SVGFontFaceElement* fontFaceElement = nullptr;
+        bool foundSVGFont = false;
+
+#if ENABLE(SVG_FONTS)
+        foundSVGFont = item.isSVGFontFaceSrc() || item.svgFontFaceElement();
+        fontFaceElement = item.svgFontFaceElement();
+#endif
+        if (!item.isLocal()) {
+            const Settings* settings = document ? &document->settings() : nullptr;
+            bool allowDownloading = foundSVGFont || (settings && settings->downloadableBinaryFontsEnabled());
+            if (allowDownloading && item.isSupportedFormat() && document) {
+                if (CachedFont* cachedFont = item.cachedFont(document, foundSVGFont, isInitiatingElementInUserAgentShadowTree))
+                    source = std::make_unique<CSSFontFaceSource>(fontFace, item.resource(), cachedFont);
+            }
+        } else
+            source = std::make_unique<CSSFontFaceSource>(fontFace, item.resource(), nullptr, fontFaceElement);
+
+        if (source)
+            fontFace.adoptSource(WTFMove(source));
     }
+    fontFace.sourcesPopulated();
+}
+
+CSSFontFace::CSSFontFace(CSSFontSelector* fontSelector, StyleRuleFontFace* cssConnection, FontFace* wrapper, bool isLocalFallback)
+    : m_timeoutTimer(*this, &CSSFontFace::timeoutFired)
+    , m_fontSelector(fontSelector)
+    , m_cssConnection(cssConnection)
+    , m_wrapper(wrapper ? wrapper->createWeakPtr() : WeakPtr<FontFace>())
+    , m_isLocalFallback(isLocalFallback)
+    , m_mayBePurged(!wrapper)
+{
+}
+
+CSSFontFace::~CSSFontFace()
+{
+}
+
+bool CSSFontFace::setFamilies(CSSValue& family)
+{
+    if (!is<CSSValueList>(family))
+        return false;
+
+    CSSValueList& familyList = downcast<CSSValueList>(family);
+    if (!familyList.length())
+        return false;
+
+    RefPtr<CSSValueList> oldFamilies = m_families;
+    m_families = &familyList;
+
+    if (m_cssConnection)
+        m_cssConnection->mutableProperties().setProperty(CSSPropertyFontFamily, &family);
+
+    iterateClients(m_clients, [&](Client& client) {
+        client.fontPropertyChanged(*this, oldFamilies.get());
+    });
+
     return true;
 }
 
-bool CSSFontFace::isValid() const
+std::optional<FontTraitsMask> CSSFontFace::calculateStyleMask(CSSValue& style)
 {
-    size_t size = m_sources.size();
-    for (size_t i = 0; i < size; i++) {
-        if (m_sources[i]->isValid())
-            return true;
+    if (!is<CSSPrimitiveValue>(style))
+        return std::nullopt;
+
+    switch (downcast<CSSPrimitiveValue>(style).valueID()) {
+    case CSSValueNormal:
+        return FontStyleNormalMask;
+    case CSSValueItalic:
+    case CSSValueOblique:
+        return FontStyleItalicMask;
+    default:
+        return FontStyleNormalMask;
+    }
+
+    return FontStyleNormalMask;
+}
+
+bool CSSFontFace::setStyle(CSSValue& style)
+{
+    if (auto mask = calculateStyleMask(style)) {
+        m_traitsMask = static_cast<FontTraitsMask>((static_cast<unsigned>(m_traitsMask) & (~FontStyleMask)) | mask.value());
+
+        if (m_cssConnection)
+            m_cssConnection->mutableProperties().setProperty(CSSPropertyFontStyle, &style);
+
+        iterateClients(m_clients, [&](Client& client) {
+            client.fontPropertyChanged(*this);
+        });
+
+        return true;
+    }
+    return false;
+}
+
+std::optional<FontTraitsMask> CSSFontFace::calculateWeightMask(CSSValue& weight)
+{
+    if (!is<CSSPrimitiveValue>(weight))
+        return std::nullopt;
+
+    switch (downcast<CSSPrimitiveValue>(weight).valueID()) {
+    case CSSValueBold:
+    case CSSValueBolder:
+    case CSSValue700:
+        return FontWeight700Mask;
+    case CSSValueNormal:
+    case CSSValue400:
+        return FontWeight400Mask;
+    case CSSValue900:
+        return FontWeight900Mask;
+    case CSSValue800:
+        return FontWeight800Mask;
+    case CSSValue600:
+        return FontWeight600Mask;
+    case CSSValue500:
+        return FontWeight500Mask;
+    case CSSValue300:
+        return FontWeight300Mask;
+    case CSSValueLighter:
+    case CSSValue200:
+        return FontWeight200Mask;
+    case CSSValue100:
+        return FontWeight100Mask;
+    default:
+        return FontWeight400Mask;
+    }
+
+    return FontWeight400Mask;
+}
+
+bool CSSFontFace::setWeight(CSSValue& weight)
+{
+    if (auto mask = calculateWeightMask(weight)) {
+        m_traitsMask = static_cast<FontTraitsMask>((static_cast<unsigned>(m_traitsMask) & (~FontWeightMask)) | mask.value());
+
+        if (m_cssConnection)
+            m_cssConnection->mutableProperties().setProperty(CSSPropertyFontWeight, &weight);
+
+        iterateClients(m_clients, [&](Client& client) {
+            client.fontPropertyChanged(*this);
+        });
+
+        return true;
     }
+
     return false;
 }
 
-void CSSFontFace::addedToSegmentedFontFace(CSSSegmentedFontFace* segmentedFontFace)
+bool CSSFontFace::setUnicodeRange(CSSValue& unicodeRange)
 {
-    m_segmentedFontFaces.add(segmentedFontFace);
+    if (!is<CSSValueList>(unicodeRange))
+        return false;
+
+    m_ranges.clear();
+    auto& list = downcast<CSSValueList>(unicodeRange);
+    for (auto& rangeValue : list) {
+        auto& range = downcast<CSSUnicodeRangeValue>(rangeValue.get());
+        m_ranges.append({ range.from(), range.to() });
+    }
+
+    if (m_cssConnection)
+        m_cssConnection->mutableProperties().setProperty(CSSPropertyUnicodeRange, &unicodeRange);
+
+    iterateClients(m_clients, [&](Client& client) {
+        client.fontPropertyChanged(*this);
+    });
+
+    return true;
 }
 
-void CSSFontFace::removedFromSegmentedFontFace(CSSSegmentedFontFace* segmentedFontFace)
+bool CSSFontFace::setVariantLigatures(CSSValue& variantLigatures)
 {
-    m_segmentedFontFaces.remove(segmentedFontFace);
+    auto ligatures = extractFontVariantLigatures(variantLigatures);
+
+    m_variantSettings.commonLigatures = ligatures.commonLigatures;
+    m_variantSettings.discretionaryLigatures = ligatures.discretionaryLigatures;
+    m_variantSettings.historicalLigatures = ligatures.historicalLigatures;
+    m_variantSettings.contextualAlternates = ligatures.contextualAlternates;
+
+    if (m_cssConnection)
+        m_cssConnection->mutableProperties().setProperty(CSSPropertyFontVariantLigatures, &variantLigatures);
+
+    iterateClients(m_clients, [&](Client& client) {
+        client.fontPropertyChanged(*this);
+    });
+
+    return true;
 }
 
-void CSSFontFace::addSource(std::unique_ptr<CSSFontFaceSource> source)
+bool CSSFontFace::setVariantPosition(CSSValue& variantPosition)
 {
-    source->setFontFace(this);
-    m_sources.append(std::move(source));
+    if (!is<CSSPrimitiveValue>(variantPosition))
+        return false;
+
+    m_variantSettings.position = downcast<CSSPrimitiveValue>(variantPosition);
+
+    if (m_cssConnection)
+        m_cssConnection->mutableProperties().setProperty(CSSPropertyFontVariantPosition, &variantPosition);
+
+    iterateClients(m_clients, [&](Client& client) {
+        client.fontPropertyChanged(*this);
+    });
+
+    return true;
 }
 
-void CSSFontFace::fontLoaded(CSSFontFaceSource* source)
+bool CSSFontFace::setVariantCaps(CSSValue& variantCaps)
 {
-    if (source != m_activeSource)
-        return;
+    if (!is<CSSPrimitiveValue>(variantCaps))
+        return false;
 
-    // FIXME: Can we assert that m_segmentedFontFaces is not empty? That may
-    // require stopping in-progress font loading when the last
-    // CSSSegmentedFontFace is removed.
-    if (m_segmentedFontFaces.isEmpty())
-        return;
+    m_variantSettings.caps = downcast<CSSPrimitiveValue>(variantCaps);
 
-    // Use one of the CSSSegmentedFontFaces' font selector. They all have
-    // the same font selector, so it's wasteful to store it in the CSSFontFace.
-    CSSFontSelector* fontSelector = (*m_segmentedFontFaces.begin())->fontSelector();
-    fontSelector->fontLoaded();
-
-#if ENABLE(FONT_LOAD_EVENTS)
-    if (RuntimeEnabledFeatures::sharedFeatures().fontLoadEventsEnabled() && m_loadState == Loading) {
-        if (source->ensureFontData())
-            notifyFontLoader(Loaded);
-        else if (!isValid())
-            notifyFontLoader(Error);
-    }
-#endif
+    if (m_cssConnection)
+        m_cssConnection->mutableProperties().setProperty(CSSPropertyFontVariantCaps, &variantCaps);
 
-    HashSet<CSSSegmentedFontFace*>::iterator end = m_segmentedFontFaces.end();
-    for (HashSet<CSSSegmentedFontFace*>::iterator it = m_segmentedFontFaces.begin(); it != end; ++it)
-        (*it)->fontLoaded(this);
+    iterateClients(m_clients, [&](Client& client) {
+        client.fontPropertyChanged(*this);
+    });
 
-#if ENABLE(FONT_LOAD_EVENTS)
-    if (RuntimeEnabledFeatures::sharedFeatures().fontLoadEventsEnabled())
-        notifyLoadingDone();
-#endif
+    return true;
 }
 
-PassRefPtr<SimpleFontData> CSSFontFace::getFontData(const FontDescription& fontDescription, bool syntheticBold, bool syntheticItalic)
+bool CSSFontFace::setVariantNumeric(CSSValue& variantNumeric)
 {
-    m_activeSource = 0;
-    if (!isValid())
-        return 0;
+    auto numeric = extractFontVariantNumeric(variantNumeric);
 
-    ASSERT(!m_segmentedFontFaces.isEmpty());
-    CSSFontSelector* fontSelector = (*m_segmentedFontFaces.begin())->fontSelector();
+    m_variantSettings.numericFigure = numeric.figure;
+    m_variantSettings.numericSpacing = numeric.spacing;
+    m_variantSettings.numericFraction = numeric.fraction;
+    m_variantSettings.numericOrdinal = numeric.ordinal;
+    m_variantSettings.numericSlashedZero = numeric.slashedZero;
 
-#if ENABLE(FONT_LOAD_EVENTS)
-    if (RuntimeEnabledFeatures::sharedFeatures().fontLoadEventsEnabled() && m_loadState == NotLoaded)
-        notifyFontLoader(Loading);
-#endif
+    if (m_cssConnection)
+        m_cssConnection->mutableProperties().setProperty(CSSPropertyFontVariantNumeric, &variantNumeric);
 
-    size_t size = m_sources.size();
-    for (size_t i = 0; i < size; ++i) {
-        if (RefPtr<SimpleFontData> result = m_sources[i]->getFontData(fontDescription, syntheticBold, syntheticItalic, fontSelector)) {
-            m_activeSource = m_sources[i].get();
-#if ENABLE(FONT_LOAD_EVENTS)
-            if (RuntimeEnabledFeatures::sharedFeatures().fontLoadEventsEnabled() && m_loadState == Loading && m_sources[i]->isLoaded()) {
-                notifyFontLoader(Loaded);
-                notifyLoadingDone();
-            }
-#endif
-            return result.release();
+    iterateClients(m_clients, [&](Client& client) {
+        client.fontPropertyChanged(*this);
+    });
+
+    return true;
+}
+
+bool CSSFontFace::setVariantAlternates(CSSValue& variantAlternates)
+{
+    if (!is<CSSPrimitiveValue>(variantAlternates))
+        return false;
+
+    m_variantSettings.alternates = downcast<CSSPrimitiveValue>(variantAlternates);
+
+    if (m_cssConnection)
+        m_cssConnection->mutableProperties().setProperty(CSSPropertyFontVariantAlternates, &variantAlternates);
+
+    iterateClients(m_clients, [&](Client& client) {
+        client.fontPropertyChanged(*this);
+    });
+
+    return true;
+}
+
+bool CSSFontFace::setVariantEastAsian(CSSValue& variantEastAsian)
+{
+    auto eastAsian = extractFontVariantEastAsian(variantEastAsian);
+
+    m_variantSettings.eastAsianVariant = eastAsian.variant;
+    m_variantSettings.eastAsianWidth = eastAsian.width;
+    m_variantSettings.eastAsianRuby = eastAsian.ruby;
+
+    if (m_cssConnection)
+        m_cssConnection->mutableProperties().setProperty(CSSPropertyFontVariantEastAsian, &variantEastAsian);
+
+    iterateClients(m_clients, [&](Client& client) {
+        client.fontPropertyChanged(*this);
+    });
+
+    return true;
+}
+
+void CSSFontFace::setFeatureSettings(CSSValue& featureSettings)
+{
+    // Can only call this with a primitive value of normal, or a value list containing font feature values.
+    ASSERT(is<CSSPrimitiveValue>(featureSettings) || is<CSSValueList>(featureSettings));
+
+    FontFeatureSettings settings;
+
+    if (is<CSSValueList>(featureSettings)) {
+        auto& list = downcast<CSSValueList>(featureSettings);
+        for (auto& rangeValue : list) {
+            auto& feature = downcast<CSSFontFeatureValue>(rangeValue.get());
+            settings.insert({ feature.tag(), feature.value() });
         }
     }
 
-#if ENABLE(FONT_LOAD_EVENTS)
-    if (RuntimeEnabledFeatures::sharedFeatures().fontLoadEventsEnabled() && m_loadState == Loading) {
-        notifyFontLoader(Error);
-        notifyLoadingDone();
+    if (m_featureSettings == settings)
+        return;
+
+    m_featureSettings = WTFMove(settings);
+
+    if (m_cssConnection)
+        m_cssConnection->mutableProperties().setProperty(CSSPropertyFontFeatureSettings, &featureSettings);
+
+    iterateClients(m_clients, [&](Client& client) {
+        client.fontPropertyChanged(*this);
+    });
+}
+
+bool CSSFontFace::rangesMatchCodePoint(UChar32 character) const
+{
+    if (m_ranges.isEmpty())
+        return true;
+
+    for (auto& range : m_ranges) {
+        if (range.from <= character && character <= range.to)
+            return true;
     }
-#endif
-    return 0;
+    return false;
 }
 
-#if ENABLE(FONT_LOAD_EVENTS)
-void CSSFontFace::notifyFontLoader(LoadState newState)
+void CSSFontFace::fontLoadEventOccurred()
 {
-    m_loadState = newState;
+    Ref<CSSFontFace> protectedThis(*this);
 
-    Document* document = (*m_segmentedFontFaces.begin())->fontSelector()->document();
-    if (!document)
-        return;
+    // If the font is already in the cache, CSSFontFaceSource may report it's loaded before it is added here as a source.
+    // Let's not pump the state machine until we've got all our sources. font() and load() are smart enough to act correctly
+    // when a source is failed or succeeded before we have asked it to load.
+    if (m_sourcesPopulated)
+        pump();
+
+    ASSERT(m_fontSelector);
+    m_fontSelector->fontLoaded();
+
+    iterateClients(m_clients, [&](Client& client) {
+        client.fontLoaded(*this);
+    });
+}
+
+void CSSFontFace::timeoutFired()
+{
+    setStatus(Status::TimedOut);
+
+    fontLoadEventOccurred();
+}
+
+bool CSSFontFace::allSourcesFailed() const
+{
+    for (auto& source : m_sources) {
+        if (source->status() != CSSFontFaceSource::Status::Failure)
+            return false;
+    }
+    return true;
+}
+
+void CSSFontFace::addClient(Client& client)
+{
+    m_clients.add(&client);
+}
 
-    switch (newState) {
-    case Loading:
-        document->fontloader()->beginFontLoading(m_rule.get());
+void CSSFontFace::removeClient(Client& client)
+{
+    ASSERT(m_clients.contains(&client));
+    m_clients.remove(&client);
+}
+
+void CSSFontFace::initializeWrapper()
+{
+    switch (m_status) {
+    case Status::Pending:
         break;
-    case Loaded:
-        document->fontloader()->fontLoaded(m_rule.get());
+    case Status::Loading:
+        m_wrapper->fontStateChanged(*this, Status::Pending, Status::Loading);
         break;
-    case Error:
-        document->fontloader()->loadError(m_rule.get(), m_activeSource);
+    case Status::TimedOut:
+        m_wrapper->fontStateChanged(*this, Status::Pending, Status::Loading);
+        m_wrapper->fontStateChanged(*this, Status::Loading, Status::TimedOut);
         break;
-    default:
+    case Status::Success:
+        m_wrapper->fontStateChanged(*this, Status::Pending, Status::Loading);
+        m_wrapper->fontStateChanged(*this, Status::Pending, Status::Success);
+        break;
+    case Status::Failure:
+        m_wrapper->fontStateChanged(*this, Status::Pending, Status::Loading);
+        m_wrapper->fontStateChanged(*this, Status::Pending, Status::Failure);
         break;
     }
+    m_mayBePurged = false;
 }
 
-void CSSFontFace::notifyLoadingDone()
+Ref<FontFace> CSSFontFace::wrapper()
 {
-    Document* document = (*m_segmentedFontFaces.begin())->fontSelector()->document();
-    if (document)
-        document->fontloader()->loadingDone();
+    if (m_wrapper)
+        return *m_wrapper.get();
+
+    auto wrapper = FontFace::create(*this);
+    m_wrapper = wrapper->createWeakPtr();
+    initializeWrapper();
+    return wrapper;
+}
+
+void CSSFontFace::setWrapper(FontFace& newWrapper)
+{
+    m_wrapper = newWrapper.createWeakPtr();
+    initializeWrapper();
+}
+
+void CSSFontFace::adoptSource(std::unique_ptr<CSSFontFaceSource>&& source)
+{
+    m_sources.append(WTFMove(source));
+
+    // We should never add sources in the middle of loading.
+    ASSERT(!m_sourcesPopulated);
+}
+
+void CSSFontFace::setStatus(Status newStatus)
+{
+    switch (newStatus) {
+    case Status::Pending:
+        ASSERT_NOT_REACHED();
+        break;
+    case Status::Loading:
+        ASSERT(m_status == Status::Pending);
+        break;
+    case Status::TimedOut:
+        ASSERT(m_status == Status::Loading);
+        break;
+    case Status::Success:
+        ASSERT(m_status == Status::Loading || m_status == Status::TimedOut);
+        break;
+    case Status::Failure:
+        ASSERT(m_status == Status::Loading || m_status == Status::TimedOut);
+        break;
+    }
+
+    if (newStatus == Status::Loading)
+        m_timeoutTimer.startOneShot(webFontsShouldAlwaysFallBack() ? 0 : 3);
+    else if (newStatus == Status::Success || newStatus == Status::Failure)
+        m_timeoutTimer.stop();
+
+    iterateClients(m_clients, [&](Client& client) {
+        client.fontStateChanged(*this, m_status, newStatus);
+    });
+
+    m_status = newStatus;
+}
+
+void CSSFontFace::fontLoaded(CSSFontFaceSource&)
+{
+    ASSERT(!webFontsShouldAlwaysFallBack());
+
+    fontLoadEventOccurred();
+}
+
+bool CSSFontFace::webFontsShouldAlwaysFallBack() const
+{
+    return m_fontSelector && m_fontSelector->document() && m_fontSelector->document()->settings().webFontsAlwaysFallBack();
+}
+
+size_t CSSFontFace::pump()
+{
+    size_t i;
+    for (i = 0; i < m_sources.size(); ++i) {
+        auto& source = m_sources[i];
+
+        if (source->status() == CSSFontFaceSource::Status::Pending) {
+            ASSERT(m_status == Status::Pending || m_status == Status::Loading || m_status == Status::TimedOut);
+            ASSERT(m_fontSelector);
+            if (m_status == Status::Pending)
+                setStatus(Status::Loading);
+            source->load(*m_fontSelector);
+        }
+
+        switch (source->status()) {
+        case CSSFontFaceSource::Status::Pending:
+            ASSERT_NOT_REACHED();
+            break;
+        case CSSFontFaceSource::Status::Loading:
+            ASSERT(m_status == Status::Pending || m_status == Status::Loading || m_status == Status::TimedOut);
+            if (m_status == Status::Pending)
+                setStatus(Status::Loading);
+            return i;
+        case CSSFontFaceSource::Status::Success:
+            ASSERT(m_status == Status::Pending || m_status == Status::Loading || m_status == Status::TimedOut || m_status == Status::Success);
+            if (m_status == Status::Pending)
+                setStatus(Status::Loading);
+            if (m_status == Status::Loading || m_status == Status::TimedOut)
+                setStatus(Status::Success);
+            return i;
+        case CSSFontFaceSource::Status::Failure:
+            if (m_status == Status::Pending)
+                setStatus(Status::Loading);
+            break;
+        }
+    }
+    if (m_sources.isEmpty() && m_status == Status::Pending)
+        setStatus(Status::Loading);
+    if (m_status == Status::Loading || m_status == Status::TimedOut)
+        setStatus(Status::Failure);
+    return m_sources.size();
+}
+
+void CSSFontFace::load()
+{
+    pump();
+}
+
+RefPtr<Font> CSSFontFace::font(const FontDescription& fontDescription, bool syntheticBold, bool syntheticItalic)
+{
+    if (allSourcesFailed())
+        return nullptr;
+
+    // Our status is derived from the first non-failed source. However, this source may
+    // return null from font(), which means we need to continue looping through the remainder
+    // of the sources to try to find a font to use. These subsequent tries should not affect
+    // our own state, though.
+    size_t startIndex = pump();
+    bool fontIsLoading = false;
+    for (size_t i = startIndex; i < m_sources.size(); ++i) {
+        auto& source = m_sources[i];
+        if (source->status() == CSSFontFaceSource::Status::Pending) {
+            ASSERT(m_fontSelector);
+            if (fontIsLoading)
+                continue;
+            source->load(*m_fontSelector);
+        }
+
+        switch (source->status()) {
+        case CSSFontFaceSource::Status::Pending:
+            ASSERT_NOT_REACHED();
+            break;
+        case CSSFontFaceSource::Status::Loading:
+            ASSERT(!fontIsLoading);
+            fontIsLoading = true;
+            if (status() == Status::TimedOut)
+                continue;
+            return Font::create(FontCache::singleton().lastResortFallbackFontForEveryCharacter(fontDescription)->platformData(), true, true);
+        case CSSFontFaceSource::Status::Success:
+            if (RefPtr<Font> result = source->font(fontDescription, syntheticBold, syntheticItalic, m_featureSettings, m_variantSettings))
+                return result;
+            break;
+        case CSSFontFaceSource::Status::Failure:
+            break;
+        }
+    }
+
+    return nullptr;
+}
+
+bool CSSFontFace::purgeable() const
+{
+    return cssConnection() && m_mayBePurged;
+}
+
+void CSSFontFace::updateStyleIfNeeded()
+{
+    if (m_fontSelector && m_fontSelector->document())
+        m_fontSelector->document()->updateStyleIfNeeded();
 }
-#endif
 
 #if ENABLE(SVG_FONTS)
 bool CSSFontFace::hasSVGFontFaceSource() const