547 lines
19 KiB
C++
547 lines
19 KiB
C++
/*
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* Copyright (C) 2016 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "CSSFontFaceSet.h"
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#include "CSSFontFaceSource.h"
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#include "CSSFontFamily.h"
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#include "CSSFontSelector.h"
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#include "CSSFontStyleValue.h"
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#include "CSSParser.h"
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#include "CSSPrimitiveValue.h"
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#include "CSSPropertyParserHelpers.h"
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#include "CSSPropertyParserWorkerSafe.h"
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#include "CSSSegmentedFontFace.h"
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#include "CSSValueList.h"
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#include "CSSValuePool.h"
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#include "FontCache.h"
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#include "StyleBuilderConverter.h"
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#include "StyleProperties.h"
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namespace WebCore {
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CSSFontFaceSet::CSSFontFaceSet(CSSFontSelector* owningFontSelector)
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: m_owningFontSelector(makeWeakPtr(owningFontSelector))
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{
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}
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CSSFontFaceSet::~CSSFontFaceSet()
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{
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for (auto& face : m_faces)
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face->removeClient(*this);
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for (auto& pair : m_locallyInstalledFacesLookupTable) {
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for (auto& face : pair.value)
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face->removeClient(*this);
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}
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}
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void CSSFontFaceSet::addFontModifiedObserver(const FontModifiedObserver& fontModifiedObserver)
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{
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auto result = m_fontModifiedObservers.add(fontModifiedObserver);
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ASSERT_UNUSED(result, result.isNewEntry);
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}
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void CSSFontFaceSet::addFontEventClient(const FontEventClient& fontEventClient)
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{
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auto result = m_fontEventClients.add(fontEventClient);
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ASSERT_UNUSED(result, result.isNewEntry);
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}
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void CSSFontFaceSet::incrementActiveCount()
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{
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++m_activeCount;
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if (m_activeCount == 1) {
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m_status = Status::Loading;
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m_fontEventClients.forEach([] (auto& client) {
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client.startedLoading();
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});
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}
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}
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void CSSFontFaceSet::decrementActiveCount()
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{
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--m_activeCount;
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if (!m_activeCount) {
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m_status = Status::Loaded;
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m_fontEventClients.forEach([] (auto& client) {
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client.completedLoading();
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});
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}
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}
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bool CSSFontFaceSet::hasFace(const CSSFontFace& face) const
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{
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for (auto& myFace : m_faces) {
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if (myFace.ptr() == &face)
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return true;
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}
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return false;
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}
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void CSSFontFaceSet::ensureLocalFontFacesForFamilyRegistered(const String& familyName)
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{
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ASSERT(m_owningFontSelector);
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if (m_locallyInstalledFacesLookupTable.contains(familyName))
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return;
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AllowUserInstalledFonts allowUserInstalledFonts = AllowUserInstalledFonts::Yes;
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if (m_owningFontSelector->scriptExecutionContext())
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allowUserInstalledFonts = m_owningFontSelector->scriptExecutionContext()->settingsValues().shouldAllowUserInstalledFonts ? AllowUserInstalledFonts::Yes : AllowUserInstalledFonts::No;
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Vector<FontSelectionCapabilities> capabilities = m_owningFontSelector->scriptExecutionContext()->fontCache().getFontSelectionCapabilitiesInFamily(familyName, allowUserInstalledFonts);
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if (capabilities.isEmpty())
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return;
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Vector<Ref<CSSFontFace>> faces;
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for (auto item : capabilities) {
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auto face = CSSFontFace::create(*m_owningFontSelector, nullptr, nullptr, true);
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Ref<CSSValueList> familyList = CSSValueList::createCommaSeparated();
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familyList->append(m_owningFontSelector->scriptExecutionContext()->cssValuePool().createFontFamilyValue(familyName));
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face->setFamilies(familyList.get());
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face->setFontSelectionCapabilities(item);
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face->adoptSource(makeUnique<CSSFontFaceSource>(face.get(), familyName));
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ASSERT(!face->computeFailureState());
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faces.append(WTFMove(face));
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}
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m_locallyInstalledFacesLookupTable.add(familyName, WTFMove(faces));
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}
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String CSSFontFaceSet::familyNameFromPrimitive(const CSSPrimitiveValue& value)
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{
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if (value.isFontFamily())
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return value.fontFamily().familyName;
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if (!value.isValueID())
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return { };
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// We need to use the raw text for all the generic family types, since @font-face is a way of actually
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// defining what font to use for those types.
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switch (value.valueID()) {
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case CSSValueSerif:
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return serifFamily.get();
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case CSSValueSansSerif:
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return sansSerifFamily.get();
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case CSSValueCursive:
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return cursiveFamily.get();
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case CSSValueFantasy:
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return fantasyFamily.get();
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case CSSValueMonospace:
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return monospaceFamily.get();
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case CSSValueWebkitPictograph:
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return pictographFamily.get();
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case CSSValueSystemUi:
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return systemUiFamily.get();
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default:
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return { };
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}
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}
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void CSSFontFaceSet::addToFacesLookupTable(CSSFontFace& face)
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{
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if (!face.families())
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return;
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auto families = face.families().value();
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for (auto& item : *families) {
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String familyName = CSSFontFaceSet::familyNameFromPrimitive(downcast<CSSPrimitiveValue>(item.get()));
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if (familyName.isEmpty())
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continue;
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auto addResult = m_facesLookupTable.add(familyName, Vector<Ref<CSSFontFace>>());
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auto& familyFontFaces = addResult.iterator->value;
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if (addResult.isNewEntry) {
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// m_locallyInstalledFontFaces grows without bound, eventually encorporating every font installed on the system.
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// This is by design.
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if (m_owningFontSelector)
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ensureLocalFontFacesForFamilyRegistered(familyName);
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familyFontFaces = { };
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}
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familyFontFaces.append(face);
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}
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}
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void CSSFontFaceSet::add(CSSFontFace& face)
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{
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ASSERT(!hasFace(face));
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m_fontModifiedObservers.forEach([] (auto& observer) {
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observer();
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});
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face.addClient(*this);
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m_cache.clear();
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if (face.cssConnection())
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m_faces.insert(m_facesPartitionIndex++, face);
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else
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m_faces.append(face);
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addToFacesLookupTable(face);
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if (face.status() == CSSFontFace::Status::Loading || face.status() == CSSFontFace::Status::TimedOut)
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incrementActiveCount();
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if (face.cssConnection()) {
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ASSERT(!m_constituentCSSConnections.contains(face.cssConnection()));
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m_constituentCSSConnections.add(face.cssConnection(), &face);
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}
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}
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void CSSFontFaceSet::removeFromFacesLookupTable(const CSSFontFace& face, const CSSValueList& familiesToSearchFor)
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{
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for (auto& item : familiesToSearchFor) {
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String familyName = CSSFontFaceSet::familyNameFromPrimitive(downcast<CSSPrimitiveValue>(item.get()));
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if (familyName.isEmpty())
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continue;
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auto iterator = m_facesLookupTable.find(familyName);
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ASSERT(iterator != m_facesLookupTable.end());
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bool found = false;
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for (size_t i = 0; i < iterator->value.size(); ++i) {
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if (iterator->value[i].ptr() == &face) {
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found = true;
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iterator->value.remove(i);
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break;
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}
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}
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ASSERT_UNUSED(found, found);
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if (!iterator->value.size())
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m_facesLookupTable.remove(iterator);
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}
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}
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void CSSFontFaceSet::remove(const CSSFontFace& face)
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{
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auto protect = makeRef(face);
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m_cache.clear();
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m_fontModifiedObservers.forEach([] (auto& observer) {
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observer();
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});
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if (face.families())
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removeFromFacesLookupTable(face, *face.families().value());
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if (face.cssConnection()) {
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ASSERT(m_constituentCSSConnections.get(face.cssConnection()) == &face);
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m_constituentCSSConnections.remove(face.cssConnection());
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}
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for (size_t i = 0; i < m_faces.size(); ++i) {
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if (m_faces[i].ptr() == &face) {
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if (i < m_facesPartitionIndex)
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--m_facesPartitionIndex;
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m_faces[i]->removeClient(*this);
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m_faces.remove(i);
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if (face.status() == CSSFontFace::Status::Loading || face.status() == CSSFontFace::Status::TimedOut)
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decrementActiveCount();
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return;
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}
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}
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ASSERT_NOT_REACHED();
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}
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CSSFontFace* CSSFontFaceSet::lookUpByCSSConnection(StyleRuleFontFace& target)
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{
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return m_constituentCSSConnections.get(&target);
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}
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void CSSFontFaceSet::purge()
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{
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Vector<Ref<CSSFontFace>> toRemove;
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for (auto& face : m_faces) {
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if (face->purgeable())
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toRemove.append(face.copyRef());
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}
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for (auto& item : toRemove)
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remove(item.get());
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}
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void CSSFontFaceSet::emptyCaches()
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{
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m_cache.clear();
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}
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void CSSFontFaceSet::clear()
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{
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for (auto& face : m_faces)
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face->removeClient(*this);
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m_faces.clear();
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m_facesLookupTable.clear();
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m_locallyInstalledFacesLookupTable.clear();
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m_cache.clear();
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m_constituentCSSConnections.clear();
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m_facesPartitionIndex = 0;
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m_status = Status::Loaded;
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}
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CSSFontFace& CSSFontFaceSet::operator[](size_t i)
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{
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ASSERT(i < faceCount());
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return m_faces[i];
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}
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static FontSelectionRequest computeFontSelectionRequest(CSSPropertyParserHelpers::FontRaw& font)
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{
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auto weightSelectionValue = font.weight
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? WTF::switchOn(*font.weight, [&] (CSSValueID keyword) {
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switch (keyword) {
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case CSSValueNormal:
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return normalWeightValue();
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case CSSValueBold:
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case CSSValueBolder:
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return boldWeightValue();
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case CSSValueLighter:
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return lightWeightValue();
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default:
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ASSERT_NOT_REACHED();
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return normalWeightValue();
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}
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}, [&] (double weight) {
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return FontSelectionValue::clampFloat(weight);
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}) : normalWeightValue();
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// Because this is a FontRaw, we know we should be able to dereference stretchSelectionValue as
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// consumeFontStretchKeywordValueRaw only returns results valid to pass to fontStretchValue.
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auto stretchSelectionValue = fontStretchValue(font.stretch.value_or(CSSValueNormal));
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ASSERT(stretchSelectionValue);
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auto styleKeyword = font.style ? font.style->style : CSSValueNormal;
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auto styleSelectionValue = [&] () -> std::optional<FontSelectionValue> {
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if (styleKeyword == CSSValueNormal)
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return std::nullopt;
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if (styleKeyword == CSSValueItalic)
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return italicValue();
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ASSERT(font.style && styleKeyword == CSSValueOblique);
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float degrees = 0;
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if (font.style->angle)
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degrees = static_cast<float>(CSSPrimitiveValue::computeDegrees(font.style->angle->type, font.style->angle->value));
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return FontSelectionValue(degrees);
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}();
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return { weightSelectionValue, *stretchSelectionValue, styleSelectionValue };
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}
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using CodePointsMap = HashSet<UChar32, DefaultHash<UChar32>, WTF::UnsignedWithZeroKeyHashTraits<UChar32>>;
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static CodePointsMap codePointsFromString(StringView stringView)
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{
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CodePointsMap result;
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auto graphemeClusters = stringView.graphemeClusters();
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for (auto cluster : graphemeClusters) {
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ASSERT(cluster.length() > 0);
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UChar32 character = 0;
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if (cluster.is8Bit())
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character = cluster[0];
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else
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U16_GET(cluster.characters16(), 0, 0, cluster.length(), character);
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result.add(character);
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}
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return result;
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}
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ExceptionOr<Vector<std::reference_wrapper<CSSFontFace>>> CSSFontFaceSet::matchingFacesExcludingPreinstalledFonts(const String& fontShorthand, const String& string)
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{
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auto font = CSSPropertyParserWorkerSafe::parseFont(fontShorthand, HTMLStandardMode);
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if (!font)
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return Exception { SyntaxError };
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HashSet<AtomString> uniqueFamilies;
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Vector<AtomString> familyOrder;
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for (auto& familyRaw : font->family) {
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AtomString familyAtom;
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WTF::switchOn(familyRaw, [&] (CSSValueID familyKeyword) {
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if (familyKeyword != CSSValueWebkitBody)
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familyAtom = familyNamesData->at(CSSPropertyParserHelpers::genericFontFamilyIndex(familyKeyword));
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else {
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ASSERT(m_owningFontSelector && m_owningFontSelector->scriptExecutionContext());
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familyAtom = m_owningFontSelector->scriptExecutionContext()->settingsValues().fontGenericFamilies.standardFontFamily();
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}
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}, [&] (const String& familyString) {
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familyAtom = familyString;
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});
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if (!familyAtom.isEmpty() && uniqueFamilies.add(familyAtom).isNewEntry)
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familyOrder.append(familyAtom);
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}
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HashSet<CSSFontFace*> resultConstituents;
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auto request = computeFontSelectionRequest(*font);
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for (auto codePoint : codePointsFromString(string)) {
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bool found = false;
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for (auto& family : familyOrder) {
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auto* faces = fontFace(request, family);
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if (!faces)
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continue;
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for (auto& constituentFace : faces->constituentFaces()) {
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if (constituentFace->isLocalFallback())
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continue;
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if (constituentFace->rangesMatchCodePoint(codePoint)) {
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resultConstituents.add(constituentFace.ptr());
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found = true;
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break;
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}
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}
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if (found)
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break;
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}
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}
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Vector<std::reference_wrapper<CSSFontFace>> result;
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result.reserveInitialCapacity(resultConstituents.size());
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for (auto* constituent : resultConstituents)
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result.uncheckedAppend(*constituent);
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return result;
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}
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ExceptionOr<bool> CSSFontFaceSet::check(const String& font, const String& text)
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{
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auto matchingFaces = this->matchingFacesExcludingPreinstalledFonts(font, text);
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if (matchingFaces.hasException())
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return matchingFaces.releaseException();
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for (auto& face : matchingFaces.releaseReturnValue()) {
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if (face.get().status() == CSSFontFace::Status::Pending)
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return false;
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}
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return true;
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}
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CSSSegmentedFontFace* CSSFontFaceSet::fontFace(FontSelectionRequest request, const AtomString& family)
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{
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auto iterator = m_facesLookupTable.find(family);
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if (iterator == m_facesLookupTable.end())
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return nullptr;
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auto& familyFontFaces = iterator->value;
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auto& segmentedFontFaceCache = m_cache.add(family, FontSelectionHashMap()).iterator->value;
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auto& face = segmentedFontFaceCache.add(request, nullptr).iterator->value;
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if (face)
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return face.get();
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face = CSSSegmentedFontFace::create();
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Vector<std::reference_wrapper<CSSFontFace>, 32> candidateFontFaces;
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for (int i = familyFontFaces.size() - 1; i >= 0; --i) {
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CSSFontFace& candidate = familyFontFaces[i];
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if (auto capabilities = candidate.fontSelectionCapabilities()) {
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if (!isItalic(request.slope) && isItalic(capabilities->slope.minimum))
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continue;
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candidateFontFaces.append(candidate);
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}
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}
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auto localIterator = m_locallyInstalledFacesLookupTable.find(family);
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if (localIterator != m_locallyInstalledFacesLookupTable.end()) {
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for (auto& candidate : localIterator->value) {
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if (auto capabilities = candidate->fontSelectionCapabilities()) {
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if (!isItalic(request.slope) && isItalic(capabilities->slope.minimum))
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continue;
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candidateFontFaces.append(candidate);
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}
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}
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}
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if (!candidateFontFaces.isEmpty()) {
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Vector<FontSelectionCapabilities> capabilities;
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capabilities.reserveInitialCapacity(candidateFontFaces.size());
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for (auto& face : candidateFontFaces) {
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auto fontSelectionCapabilities = face.get().fontSelectionCapabilities();
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capabilities.uncheckedAppend(*fontSelectionCapabilities);
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}
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FontSelectionAlgorithm fontSelectionAlgorithm(request, capabilities);
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std::stable_sort(candidateFontFaces.begin(), candidateFontFaces.end(), [&fontSelectionAlgorithm](const CSSFontFace& first, const CSSFontFace& second) {
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auto firstCapabilities = first.fontSelectionCapabilities();
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auto secondCapabilities = second.fontSelectionCapabilities();
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auto stretchDistanceFirst = fontSelectionAlgorithm.stretchDistance(*firstCapabilities).distance;
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auto stretchDistanceSecond = fontSelectionAlgorithm.stretchDistance(*secondCapabilities).distance;
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if (stretchDistanceFirst < stretchDistanceSecond)
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return true;
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if (stretchDistanceFirst > stretchDistanceSecond)
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return false;
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auto styleDistanceFirst = fontSelectionAlgorithm.styleDistance(*firstCapabilities).distance;
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auto styleDistanceSecond = fontSelectionAlgorithm.styleDistance(*secondCapabilities).distance;
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if (styleDistanceFirst < styleDistanceSecond)
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return true;
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if (styleDistanceFirst > styleDistanceSecond)
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return false;
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auto weightDistanceFirst = fontSelectionAlgorithm.weightDistance(*firstCapabilities).distance;
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auto weightDistanceSecond = fontSelectionAlgorithm.weightDistance(*secondCapabilities).distance;
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if (weightDistanceFirst < weightDistanceSecond)
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return true;
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return false;
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});
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CSSFontFace* previousCandidate = nullptr;
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for (auto& candidate : candidateFontFaces) {
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if (&candidate.get() == previousCandidate)
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continue;
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previousCandidate = &candidate.get();
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face->appendFontFace(candidate.get());
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}
|
|
}
|
|
|
|
return face.get();
|
|
}
|
|
|
|
void CSSFontFaceSet::fontStateChanged(CSSFontFace& face, CSSFontFace::Status oldState, CSSFontFace::Status newState)
|
|
{
|
|
ASSERT(hasFace(face));
|
|
if (oldState == CSSFontFace::Status::Pending) {
|
|
ASSERT(newState == CSSFontFace::Status::Loading);
|
|
incrementActiveCount();
|
|
}
|
|
if (newState == CSSFontFace::Status::Success || newState == CSSFontFace::Status::Failure) {
|
|
ASSERT(oldState == CSSFontFace::Status::Loading || oldState == CSSFontFace::Status::TimedOut);
|
|
m_fontEventClients.forEach([&] (auto& client) {
|
|
client.faceFinished(face, newState);
|
|
});
|
|
decrementActiveCount();
|
|
}
|
|
}
|
|
|
|
void CSSFontFaceSet::fontPropertyChanged(CSSFontFace& face, CSSValueList* oldFamilies)
|
|
{
|
|
m_cache.clear();
|
|
|
|
if (oldFamilies) {
|
|
removeFromFacesLookupTable(face, *oldFamilies);
|
|
addToFacesLookupTable(face);
|
|
}
|
|
|
|
m_fontModifiedObservers.forEach([] (auto& observer) {
|
|
observer();
|
|
});
|
|
}
|
|
|
|
}
|