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CSSFontFaceSet.cpp
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CSSFontFaceSet.cpp
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/*
* Copyright (C) 2016 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.
*/
#include "config.h"
#include "CSSFontFaceSet.h"
#include "CSSFontFaceSource.h"
#include "CSSFontFamily.h"
#include "CSSFontSelector.h"
#include "CSSFontStyleValue.h"
#include "CSSParser.h"
#include "CSSPrimitiveValue.h"
#include "CSSPropertyParserHelpers.h"
#include "CSSPropertyParserWorkerSafe.h"
#include "CSSSegmentedFontFace.h"
#include "CSSValueList.h"
#include "CSSValuePool.h"
#include "FontCache.h"
#include "StyleBuilderConverter.h"
#include "StyleProperties.h"
namespace WebCore {
CSSFontFaceSet::CSSFontFaceSet(CSSFontSelector* owningFontSelector)
: m_owningFontSelector(makeWeakPtr(owningFontSelector))
{
}
CSSFontFaceSet::~CSSFontFaceSet()
{
for (auto& face : m_faces)
face->removeClient(*this);
for (auto& pair : m_locallyInstalledFacesLookupTable) {
for (auto& face : pair.value)
face->removeClient(*this);
}
}
void CSSFontFaceSet::addFontModifiedObserver(const FontModifiedObserver& fontModifiedObserver)
{
auto result = m_fontModifiedObservers.add(fontModifiedObserver);
ASSERT_UNUSED(result, result.isNewEntry);
}
void CSSFontFaceSet::addFontEventClient(const FontEventClient& fontEventClient)
{
auto result = m_fontEventClients.add(fontEventClient);
ASSERT_UNUSED(result, result.isNewEntry);
}
void CSSFontFaceSet::incrementActiveCount()
{
++m_activeCount;
if (m_activeCount == 1) {
m_status = Status::Loading;
m_fontEventClients.forEach([] (auto& client) {
client.startedLoading();
});
}
}
void CSSFontFaceSet::decrementActiveCount()
{
--m_activeCount;
if (!m_activeCount) {
m_status = Status::Loaded;
m_fontEventClients.forEach([] (auto& client) {
client.completedLoading();
});
}
}
bool CSSFontFaceSet::hasFace(const CSSFontFace& face) const
{
for (auto& myFace : m_faces) {
if (myFace.ptr() == &face)
return true;
}
return false;
}
void CSSFontFaceSet::ensureLocalFontFacesForFamilyRegistered(const String& familyName)
{
ASSERT(m_owningFontSelector);
if (m_locallyInstalledFacesLookupTable.contains(familyName))
return;
if (!m_owningFontSelector->scriptExecutionContext())
return;
AllowUserInstalledFonts allowUserInstalledFonts = m_owningFontSelector->scriptExecutionContext()->settingsValues().shouldAllowUserInstalledFonts ? AllowUserInstalledFonts::Yes : AllowUserInstalledFonts::No;
Vector<FontSelectionCapabilities> capabilities = m_owningFontSelector->scriptExecutionContext()->fontCache().getFontSelectionCapabilitiesInFamily(familyName, allowUserInstalledFonts);
if (capabilities.isEmpty())
return;
Vector<Ref<CSSFontFace>> faces;
for (auto item : capabilities) {
auto face = CSSFontFace::create(*m_owningFontSelector, nullptr, nullptr, true);
Ref<CSSValueList> familyList = CSSValueList::createCommaSeparated();
familyList->append(m_owningFontSelector->scriptExecutionContext()->cssValuePool().createFontFamilyValue(familyName));
face->setFamilies(familyList.get());
face->setFontSelectionCapabilities(item);
face->adoptSource(makeUnique<CSSFontFaceSource>(face.get(), familyName));
ASSERT(!face->computeFailureState());
faces.append(WTFMove(face));
}
m_locallyInstalledFacesLookupTable.add(familyName, WTFMove(faces));
}
String CSSFontFaceSet::familyNameFromPrimitive(const CSSPrimitiveValue& value)
{
if (value.isFontFamily())
return value.fontFamily().familyName;
if (!value.isValueID())
return { };
// We need to use the raw text for all the generic family types, since @font-face is a way of actually
// defining what font to use for those types.
switch (value.valueID()) {
case CSSValueSerif:
return serifFamily.get();
case CSSValueSansSerif:
return sansSerifFamily.get();
case CSSValueCursive:
return cursiveFamily.get();
case CSSValueFantasy:
return fantasyFamily.get();
case CSSValueMonospace:
return monospaceFamily.get();
case CSSValueWebkitPictograph:
return pictographFamily.get();
case CSSValueSystemUi:
return systemUiFamily.get();
default:
return { };
}
}
void CSSFontFaceSet::addToFacesLookupTable(CSSFontFace& face)
{
if (!face.families())
return;
auto families = face.families().value();
for (auto& item : *families) {
String familyName = CSSFontFaceSet::familyNameFromPrimitive(downcast<CSSPrimitiveValue>(item.get()));
if (familyName.isEmpty())
continue;
auto addResult = m_facesLookupTable.add(familyName, Vector<Ref<CSSFontFace>>());
auto& familyFontFaces = addResult.iterator->value;
if (addResult.isNewEntry) {
// m_locallyInstalledFontFaces grows without bound, eventually encorporating every font installed on the system.
// This is by design.
if (m_owningFontSelector)
ensureLocalFontFacesForFamilyRegistered(familyName);
familyFontFaces = { };
}
familyFontFaces.append(face);
}
}
void CSSFontFaceSet::add(CSSFontFace& face)
{
ASSERT(!hasFace(face));
m_fontModifiedObservers.forEach([] (auto& observer) {
observer();
});
face.addClient(*this);
m_cache.clear();
if (face.cssConnection())
m_faces.insert(m_facesPartitionIndex++, face);
else
m_faces.append(face);
addToFacesLookupTable(face);
if (face.status() == CSSFontFace::Status::Loading || face.status() == CSSFontFace::Status::TimedOut)
incrementActiveCount();
if (face.cssConnection()) {
ASSERT(!m_constituentCSSConnections.contains(face.cssConnection()));
m_constituentCSSConnections.add(face.cssConnection(), &face);
}
}
void CSSFontFaceSet::removeFromFacesLookupTable(const CSSFontFace& face, const CSSValueList& familiesToSearchFor)
{
for (auto& item : familiesToSearchFor) {
String familyName = CSSFontFaceSet::familyNameFromPrimitive(downcast<CSSPrimitiveValue>(item.get()));
if (familyName.isEmpty())
continue;
auto iterator = m_facesLookupTable.find(familyName);
ASSERT(iterator != m_facesLookupTable.end());
bool found = false;
for (size_t i = 0; i < iterator->value.size(); ++i) {
if (iterator->value[i].ptr() == &face) {
found = true;
iterator->value.remove(i);
break;
}
}
ASSERT_UNUSED(found, found);
if (!iterator->value.size())
m_facesLookupTable.remove(iterator);
}
}
void CSSFontFaceSet::remove(const CSSFontFace& face)
{
auto protect = makeRef(face);
m_cache.clear();
m_fontModifiedObservers.forEach([] (auto& observer) {
observer();
});
if (face.families())
removeFromFacesLookupTable(face, *face.families().value());
if (face.cssConnection()) {
ASSERT(m_constituentCSSConnections.get(face.cssConnection()) == &face);
m_constituentCSSConnections.remove(face.cssConnection());
}
for (size_t i = 0; i < m_faces.size(); ++i) {
if (m_faces[i].ptr() == &face) {
if (i < m_facesPartitionIndex)
--m_facesPartitionIndex;
m_faces[i]->removeClient(*this);
m_faces.remove(i);
if (face.status() == CSSFontFace::Status::Loading || face.status() == CSSFontFace::Status::TimedOut)
decrementActiveCount();
return;
}
}
ASSERT_NOT_REACHED();
}
CSSFontFace* CSSFontFaceSet::lookUpByCSSConnection(StyleRuleFontFace& target)
{
return m_constituentCSSConnections.get(&target);
}
void CSSFontFaceSet::purge()
{
Vector<Ref<CSSFontFace>> toRemove;
for (auto& face : m_faces) {
if (face->purgeable())
toRemove.append(face.copyRef());
}
for (auto& item : toRemove)
remove(item.get());
}
void CSSFontFaceSet::emptyCaches()
{
m_cache.clear();
}
void CSSFontFaceSet::clear()
{
for (auto& face : m_faces)
face->removeClient(*this);
m_faces.clear();
m_facesLookupTable.clear();
m_locallyInstalledFacesLookupTable.clear();
m_cache.clear();
m_constituentCSSConnections.clear();
m_facesPartitionIndex = 0;
m_status = Status::Loaded;
}
CSSFontFace& CSSFontFaceSet::operator[](size_t i)
{
ASSERT(i < faceCount());
return m_faces[i];
}
static FontSelectionRequest computeFontSelectionRequest(CSSPropertyParserHelpers::FontRaw& font)
{
auto weightSelectionValue = font.weight
? WTF::switchOn(*font.weight, [&] (CSSValueID keyword) {
switch (keyword) {
case CSSValueNormal:
return normalWeightValue();
case CSSValueBold:
case CSSValueBolder:
return boldWeightValue();
case CSSValueLighter:
return lightWeightValue();
default:
ASSERT_NOT_REACHED();
return normalWeightValue();
}
}, [&] (double weight) {
return FontSelectionValue::clampFloat(weight);
}) : normalWeightValue();
// Because this is a FontRaw, we know we should be able to dereference stretchSelectionValue as
// consumeFontStretchKeywordValueRaw only returns results valid to pass to fontStretchValue.
auto stretchSelectionValue = fontStretchValue(font.stretch.value_or(CSSValueNormal));
ASSERT(stretchSelectionValue);
auto styleKeyword = font.style ? font.style->style : CSSValueNormal;
auto styleSelectionValue = [&] () -> std::optional<FontSelectionValue> {
if (styleKeyword == CSSValueNormal)
return std::nullopt;
if (styleKeyword == CSSValueItalic)
return italicValue();
ASSERT(font.style && styleKeyword == CSSValueOblique);
float degrees = 0;
if (font.style->angle)
degrees = static_cast<float>(CSSPrimitiveValue::computeDegrees(font.style->angle->type, font.style->angle->value));
return FontSelectionValue(degrees);
}();
return { weightSelectionValue, *stretchSelectionValue, styleSelectionValue };
}
using CodePointsMap = HashSet<UChar32, DefaultHash<UChar32>, WTF::UnsignedWithZeroKeyHashTraits<UChar32>>;
static CodePointsMap codePointsFromString(StringView stringView)
{
CodePointsMap result;
auto graphemeClusters = stringView.graphemeClusters();
for (auto cluster : graphemeClusters) {
ASSERT(cluster.length() > 0);
UChar32 character = 0;
if (cluster.is8Bit())
character = cluster[0];
else
U16_GET(cluster.characters16(), 0, 0, cluster.length(), character);
result.add(character);
}
return result;
}
ExceptionOr<Vector<std::reference_wrapper<CSSFontFace>>> CSSFontFaceSet::matchingFacesExcludingPreinstalledFonts(const String& fontShorthand, const String& string)
{
auto font = CSSPropertyParserWorkerSafe::parseFont(fontShorthand, HTMLStandardMode);
if (!font)
return Exception { SyntaxError };
HashSet<AtomString> uniqueFamilies;
Vector<AtomString> familyOrder;
for (auto& familyRaw : font->family) {
AtomString familyAtom;
WTF::switchOn(familyRaw, [&] (CSSValueID familyKeyword) {
if (familyKeyword != CSSValueWebkitBody)
familyAtom = familyNamesData->at(CSSPropertyParserHelpers::genericFontFamilyIndex(familyKeyword));
else {
ASSERT(m_owningFontSelector && m_owningFontSelector->scriptExecutionContext());
familyAtom = m_owningFontSelector->scriptExecutionContext()->settingsValues().fontGenericFamilies.standardFontFamily();
}
}, [&] (const String& familyString) {
familyAtom = familyString;
});
if (!familyAtom.isEmpty() && uniqueFamilies.add(familyAtom).isNewEntry)
familyOrder.append(familyAtom);
}
HashSet<CSSFontFace*> resultConstituents;
auto request = computeFontSelectionRequest(*font);
for (auto codePoint : codePointsFromString(string)) {
bool found = false;
for (auto& family : familyOrder) {
auto* faces = fontFace(request, family);
if (!faces)
continue;
for (auto& constituentFace : faces->constituentFaces()) {
if (constituentFace->isLocalFallback())
continue;
if (constituentFace->rangesMatchCodePoint(codePoint)) {
resultConstituents.add(constituentFace.ptr());
found = true;
break;
}
}
if (found)
break;
}
}
Vector<std::reference_wrapper<CSSFontFace>> result;
result.reserveInitialCapacity(resultConstituents.size());
for (auto* constituent : resultConstituents)
result.uncheckedAppend(*constituent);
return result;
}
ExceptionOr<bool> CSSFontFaceSet::check(const String& font, const String& text)
{
auto matchingFaces = this->matchingFacesExcludingPreinstalledFonts(font, text);
if (matchingFaces.hasException())
return matchingFaces.releaseException();
for (auto& face : matchingFaces.releaseReturnValue()) {
if (face.get().status() == CSSFontFace::Status::Pending)
return false;
}
return true;
}
CSSSegmentedFontFace* CSSFontFaceSet::fontFace(FontSelectionRequest request, const AtomString& family)
{
auto iterator = m_facesLookupTable.find(family);
if (iterator == m_facesLookupTable.end())
return nullptr;
auto& familyFontFaces = iterator->value;
auto& segmentedFontFaceCache = m_cache.add(family, FontSelectionHashMap()).iterator->value;
auto& face = segmentedFontFaceCache.add(request, nullptr).iterator->value;
if (face)
return face.get();
face = CSSSegmentedFontFace::create();
Vector<std::reference_wrapper<CSSFontFace>, 32> candidateFontFaces;
for (int i = familyFontFaces.size() - 1; i >= 0; --i) {
CSSFontFace& candidate = familyFontFaces[i];
if (auto capabilities = candidate.fontSelectionCapabilities()) {
if (!isItalic(request.slope) && isItalic(capabilities->slope.minimum))
continue;
candidateFontFaces.append(candidate);
}
}
auto localIterator = m_locallyInstalledFacesLookupTable.find(family);
if (localIterator != m_locallyInstalledFacesLookupTable.end()) {
for (auto& candidate : localIterator->value) {
if (auto capabilities = candidate->fontSelectionCapabilities()) {
if (!isItalic(request.slope) && isItalic(capabilities->slope.minimum))
continue;
candidateFontFaces.append(candidate);
}
}
}
if (!candidateFontFaces.isEmpty()) {
Vector<FontSelectionCapabilities> capabilities;
capabilities.reserveInitialCapacity(candidateFontFaces.size());
for (auto& face : candidateFontFaces) {
auto fontSelectionCapabilities = face.get().fontSelectionCapabilities();
capabilities.uncheckedAppend(*fontSelectionCapabilities);
}
FontSelectionAlgorithm fontSelectionAlgorithm(request, capabilities);
std::stable_sort(candidateFontFaces.begin(), candidateFontFaces.end(), [&fontSelectionAlgorithm](const CSSFontFace& first, const CSSFontFace& second) {
auto firstCapabilities = first.fontSelectionCapabilities();
auto secondCapabilities = second.fontSelectionCapabilities();
auto stretchDistanceFirst = fontSelectionAlgorithm.stretchDistance(*firstCapabilities).distance;
auto stretchDistanceSecond = fontSelectionAlgorithm.stretchDistance(*secondCapabilities).distance;
if (stretchDistanceFirst < stretchDistanceSecond)
return true;
if (stretchDistanceFirst > stretchDistanceSecond)
return false;
auto styleDistanceFirst = fontSelectionAlgorithm.styleDistance(*firstCapabilities).distance;
auto styleDistanceSecond = fontSelectionAlgorithm.styleDistance(*secondCapabilities).distance;
if (styleDistanceFirst < styleDistanceSecond)
return true;
if (styleDistanceFirst > styleDistanceSecond)
return false;
auto weightDistanceFirst = fontSelectionAlgorithm.weightDistance(*firstCapabilities).distance;
auto weightDistanceSecond = fontSelectionAlgorithm.weightDistance(*secondCapabilities).distance;
if (weightDistanceFirst < weightDistanceSecond)
return true;
return false;
});
CSSFontFace* previousCandidate = nullptr;
for (auto& candidate : candidateFontFaces) {
if (&candidate.get() == previousCandidate)
continue;
previousCandidate = &candidate.get();
face->appendFontFace(candidate.get());
}
}
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();
});
}
}