CSSFontSelector.cpp [plain text]
#include "config.h"
#include "CSSFontSelector.h"
#include "CachedFont.h"
#include "CSSFontFace.h"
#include "CSSFontFaceRule.h"
#include "CSSFontFaceSource.h"
#include "CSSFontFaceSrcValue.h"
#include "CSSFontFamily.h"
#include "CSSPrimitiveValue.h"
#include "CSSPropertyNames.h"
#include "CSSSegmentedFontFace.h"
#include "CSSUnicodeRangeValue.h"
#include "CSSValueKeywords.h"
#include "CSSValueList.h"
#include "CachedResourceLoader.h"
#include "Document.h"
#include "Font.h"
#include "FontCache.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "SVGFontFaceElement.h"
#include "SVGNames.h"
#include "Settings.h"
#include "StyleProperties.h"
#include "StyleResolver.h"
#include "StyleRule.h"
#include "WebKitFontFamilyNames.h"
#include <wtf/Ref.h>
#include <wtf/text/AtomicString.h>
namespace WebCore {
static unsigned fontSelectorId;
CSSFontSelector::CSSFontSelector(Document& document)
: m_document(&document)
, m_beginLoadingTimer(*this, &CSSFontSelector::beginLoadTimerFired)
, m_uniqueId(++fontSelectorId)
, m_version(0)
{
ASSERT(m_document);
FontCache::singleton().addClient(this);
}
CSSFontSelector::~CSSFontSelector()
{
clearDocument();
FontCache::singleton().removeClient(this);
}
bool CSSFontSelector::isEmpty() const
{
return m_fonts.isEmpty();
}
void CSSFontSelector::addFontFaceRule(const StyleRuleFontFace* fontFaceRule, bool isInitiatingElementInUserAgentShadowTree)
{
const StyleProperties& style = fontFaceRule->properties();
RefPtr<CSSValue> fontFamily = style.getPropertyCSSValue(CSSPropertyFontFamily);
RefPtr<CSSValue> src = style.getPropertyCSSValue(CSSPropertySrc);
RefPtr<CSSValue> unicodeRange = style.getPropertyCSSValue(CSSPropertyUnicodeRange);
if (!is<CSSValueList>(fontFamily.get()) || !is<CSSValueList>(src.get()) || (unicodeRange && !is<CSSValueList>(*unicodeRange)))
return;
CSSValueList& familyList = downcast<CSSValueList>(*fontFamily);
if (!familyList.length())
return;
CSSValueList& srcList = downcast<CSSValueList>(*src);
if (!srcList.length())
return;
CSSValueList* rangeList = downcast<CSSValueList>(unicodeRange.get());
unsigned traitsMask = 0;
if (RefPtr<CSSValue> fontStyle = style.getPropertyCSSValue(CSSPropertyFontStyle)) {
if (!is<CSSPrimitiveValue>(*fontStyle))
return;
switch (downcast<CSSPrimitiveValue>(*fontStyle).getValueID()) {
case CSSValueNormal:
traitsMask |= FontStyleNormalMask;
break;
case CSSValueItalic:
case CSSValueOblique:
traitsMask |= FontStyleItalicMask;
break;
default:
break;
}
} else
traitsMask |= FontStyleNormalMask;
if (RefPtr<CSSValue> fontWeight = style.getPropertyCSSValue(CSSPropertyFontWeight)) {
if (!is<CSSPrimitiveValue>(*fontWeight))
return;
switch (downcast<CSSPrimitiveValue>(*fontWeight).getValueID()) {
case CSSValueBold:
case CSSValue700:
traitsMask |= FontWeight700Mask;
break;
case CSSValueNormal:
case CSSValue400:
traitsMask |= FontWeight400Mask;
break;
case CSSValue900:
traitsMask |= FontWeight900Mask;
break;
case CSSValue800:
traitsMask |= FontWeight800Mask;
break;
case CSSValue600:
traitsMask |= FontWeight600Mask;
break;
case CSSValue500:
traitsMask |= FontWeight500Mask;
break;
case CSSValue300:
traitsMask |= FontWeight300Mask;
break;
case CSSValue200:
traitsMask |= FontWeight200Mask;
break;
case CSSValue100:
traitsMask |= FontWeight100Mask;
break;
default:
break;
}
} else
traitsMask |= FontWeight400Mask;
if (RefPtr<CSSValue> fontVariant = style.getPropertyCSSValue(CSSPropertyFontVariant)) {
if (fontVariant->isPrimitiveValue()) {
RefPtr<CSSValueList> list = CSSValueList::createCommaSeparated();
list->append(fontVariant.releaseNonNull());
fontVariant = list.releaseNonNull();
} else if (!is<CSSValueList>(*fontVariant))
return;
CSSValueList& variantList = downcast<CSSValueList>(*fontVariant);
unsigned numVariants = variantList.length();
if (!numVariants)
return;
for (unsigned i = 0; i < numVariants; ++i) {
switch (downcast<CSSPrimitiveValue>(variantList.itemWithoutBoundsCheck(i))->getValueID()) {
case CSSValueNormal:
traitsMask |= FontVariantNormalMask;
break;
case CSSValueSmallCaps:
traitsMask |= FontVariantSmallCapsMask;
break;
default:
break;
}
}
} else
traitsMask |= FontVariantMask;
RefPtr<CSSFontFace> fontFace;
int srcLength = srcList.length();
bool foundSVGFont = false;
for (int i = 0; i < srcLength; i++) {
CSSFontFaceSrcValue& item = downcast<CSSFontFaceSrcValue>(*srcList.itemWithoutBoundsCheck(i));
std::unique_ptr<CSSFontFaceSource> source;
#if ENABLE(SVG_FONTS)
foundSVGFont = item.isSVGFontFaceSrc() || item.svgFontFaceElement();
#endif
if (!item.isLocal()) {
Settings* settings = m_document ? m_document->frame() ? &m_document->frame()->settings() : 0 : 0;
bool allowDownloading = foundSVGFont || (settings && settings->downloadableBinaryFontsEnabled());
if (allowDownloading && item.isSupportedFormat() && m_document) {
CachedFont* cachedFont = item.cachedFont(m_document, foundSVGFont, isInitiatingElementInUserAgentShadowTree);
if (cachedFont) {
source = std::make_unique<CSSFontFaceSource>(item.resource(), cachedFont);
#if ENABLE(SVG_FONTS)
if (foundSVGFont)
source->setHasExternalSVGFont();
#endif
}
}
} else {
source = std::make_unique<CSSFontFaceSource>(item.resource());
}
if (!fontFace) {
RefPtr<CSSFontFaceRule> rule;
#if ENABLE(FONT_LOAD_EVENTS)
if (RuntimeEnabledFeatures::sharedFeatures().fontLoadEventsEnabled())
rule = static_pointer_cast<CSSFontFaceRule>(fontFaceRule->createCSSOMWrapper());
#endif
fontFace = CSSFontFace::create(static_cast<FontTraitsMask>(traitsMask), rule);
}
if (source) {
#if ENABLE(SVG_FONTS)
source->setSVGFontFaceElement(item.svgFontFaceElement());
#endif
fontFace->addSource(WTF::move(source));
}
}
ASSERT(fontFace);
if (fontFace && !fontFace->isValid())
return;
if (rangeList) {
unsigned numRanges = rangeList->length();
for (unsigned i = 0; i < numRanges; i++) {
CSSUnicodeRangeValue& range = downcast<CSSUnicodeRangeValue>(*rangeList->itemWithoutBoundsCheck(i));
fontFace->addRange(range.from(), range.to());
}
}
for (auto& item : familyList) {
auto& value = downcast<CSSPrimitiveValue>(item.get());
String familyName;
if (value.isFontFamily()) {
familyName = value.fontFamily().familyName;
} else if (value.isValueID()) {
switch (value.getValueID()) {
case CSSValueSerif:
familyName = serifFamily;
break;
case CSSValueSansSerif:
familyName = sansSerifFamily;
break;
case CSSValueCursive:
familyName = cursiveFamily;
break;
case CSSValueFantasy:
familyName = fantasyFamily;
break;
case CSSValueMonospace:
familyName = monospaceFamily;
break;
case CSSValueWebkitPictograph:
familyName = pictographFamily;
break;
default:
break;
}
}
if (familyName.isEmpty())
continue;
std::unique_ptr<Vector<RefPtr<CSSFontFace>>>& familyFontFaces = m_fontFaces.add(familyName, nullptr).iterator->value;
if (!familyFontFaces) {
familyFontFaces = std::make_unique<Vector<RefPtr<CSSFontFace>>>();
ASSERT(!m_locallyInstalledFontFaces.contains(familyName));
Vector<unsigned> locallyInstalledFontsTraitsMasks;
FontCache::singleton().getTraitsInFamily(familyName, locallyInstalledFontsTraitsMasks);
if (unsigned numLocallyInstalledFaces = locallyInstalledFontsTraitsMasks.size()) {
auto familyLocallyInstalledFaces = std::make_unique<Vector<RefPtr<CSSFontFace>>>();
for (unsigned i = 0; i < numLocallyInstalledFaces; ++i) {
RefPtr<CSSFontFace> locallyInstalledFontFace = CSSFontFace::create(static_cast<FontTraitsMask>(locallyInstalledFontsTraitsMasks[i]), 0, true);
locallyInstalledFontFace->addSource(std::make_unique<CSSFontFaceSource>(familyName));
ASSERT(locallyInstalledFontFace->isValid());
familyLocallyInstalledFaces->append(locallyInstalledFontFace);
}
m_locallyInstalledFontFaces.set(familyName, WTF::move(familyLocallyInstalledFaces));
}
}
familyFontFaces->append(fontFace);
++m_version;
}
}
void CSSFontSelector::registerForInvalidationCallbacks(FontSelectorClient& client)
{
m_clients.add(&client);
}
void CSSFontSelector::unregisterForInvalidationCallbacks(FontSelectorClient& client)
{
m_clients.remove(&client);
}
void CSSFontSelector::dispatchInvalidationCallbacks()
{
++m_version;
Vector<FontSelectorClient*> clients;
copyToVector(m_clients, clients);
for (size_t i = 0; i < clients.size(); ++i)
clients[i]->fontsNeedUpdate(*this);
}
void CSSFontSelector::fontLoaded()
{
dispatchInvalidationCallbacks();
}
void CSSFontSelector::fontCacheInvalidated()
{
dispatchInvalidationCallbacks();
}
static const AtomicString& resolveGenericFamily(Document* document, const FontDescription& fontDescription, const AtomicString& familyName)
{
if (!document || !document->frame())
return familyName;
const Settings& settings = document->frame()->settings();
UScriptCode script = fontDescription.script();
if (familyName == serifFamily)
return settings.serifFontFamily(script);
if (familyName == sansSerifFamily)
return settings.sansSerifFontFamily(script);
if (familyName == cursiveFamily)
return settings.cursiveFontFamily(script);
if (familyName == fantasyFamily)
return settings.fantasyFontFamily(script);
if (familyName == monospaceFamily)
return settings.fixedFontFamily(script);
if (familyName == pictographFamily)
return settings.pictographFontFamily(script);
if (familyName == standardFamily)
return settings.standardFontFamily(script);
return familyName;
}
static FontTraitsMask desiredTraitsMaskForComparison;
static inline bool compareFontFaces(CSSFontFace* first, CSSFontFace* second)
{
FontTraitsMask firstTraitsMask = first->traitsMask();
FontTraitsMask secondTraitsMask = second->traitsMask();
bool firstHasDesiredVariant = firstTraitsMask & desiredTraitsMaskForComparison & FontVariantMask;
bool secondHasDesiredVariant = secondTraitsMask & desiredTraitsMaskForComparison & FontVariantMask;
if (firstHasDesiredVariant != secondHasDesiredVariant)
return firstHasDesiredVariant;
if ((desiredTraitsMaskForComparison & FontVariantSmallCapsMask) && !first->isLocalFallback() && !second->isLocalFallback()) {
bool firstRequiresSmallCaps = (firstTraitsMask & FontVariantSmallCapsMask) && !(firstTraitsMask & FontVariantNormalMask);
bool secondRequiresSmallCaps = (secondTraitsMask & FontVariantSmallCapsMask) && !(secondTraitsMask & FontVariantNormalMask);
if (firstRequiresSmallCaps != secondRequiresSmallCaps)
return firstRequiresSmallCaps;
}
bool firstHasDesiredStyle = firstTraitsMask & desiredTraitsMaskForComparison & FontStyleMask;
bool secondHasDesiredStyle = secondTraitsMask & desiredTraitsMaskForComparison & FontStyleMask;
if (firstHasDesiredStyle != secondHasDesiredStyle)
return firstHasDesiredStyle;
if ((desiredTraitsMaskForComparison & FontStyleItalicMask) && !first->isLocalFallback() && !second->isLocalFallback()) {
bool firstRequiresItalics = (firstTraitsMask & FontStyleItalicMask) && !(firstTraitsMask & FontStyleNormalMask);
bool secondRequiresItalics = (secondTraitsMask & FontStyleItalicMask) && !(secondTraitsMask & FontStyleNormalMask);
if (firstRequiresItalics != secondRequiresItalics)
return firstRequiresItalics;
}
if (secondTraitsMask & desiredTraitsMaskForComparison & FontWeightMask)
return false;
if (firstTraitsMask & desiredTraitsMaskForComparison & FontWeightMask)
return true;
static const unsigned fallbackRuleSets = 9;
static const unsigned rulesPerSet = 8;
static const FontTraitsMask weightFallbackRuleSets[fallbackRuleSets][rulesPerSet] = {
{ FontWeight200Mask, FontWeight300Mask, FontWeight400Mask, FontWeight500Mask, FontWeight600Mask, FontWeight700Mask, FontWeight800Mask, FontWeight900Mask },
{ FontWeight100Mask, FontWeight300Mask, FontWeight400Mask, FontWeight500Mask, FontWeight600Mask, FontWeight700Mask, FontWeight800Mask, FontWeight900Mask },
{ FontWeight200Mask, FontWeight100Mask, FontWeight400Mask, FontWeight500Mask, FontWeight600Mask, FontWeight700Mask, FontWeight800Mask, FontWeight900Mask },
{ FontWeight500Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask, FontWeight600Mask, FontWeight700Mask, FontWeight800Mask, FontWeight900Mask },
{ FontWeight400Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask, FontWeight600Mask, FontWeight700Mask, FontWeight800Mask, FontWeight900Mask },
{ FontWeight700Mask, FontWeight800Mask, FontWeight900Mask, FontWeight500Mask, FontWeight400Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask },
{ FontWeight800Mask, FontWeight900Mask, FontWeight600Mask, FontWeight500Mask, FontWeight400Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask },
{ FontWeight900Mask, FontWeight700Mask, FontWeight600Mask, FontWeight500Mask, FontWeight400Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask },
{ FontWeight800Mask, FontWeight700Mask, FontWeight600Mask, FontWeight500Mask, FontWeight400Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask }
};
unsigned ruleSetIndex = 0;
unsigned w = FontWeight100Bit;
while (!(desiredTraitsMaskForComparison & (1 << w))) {
w++;
ruleSetIndex++;
}
ASSERT_WITH_SECURITY_IMPLICATION(ruleSetIndex < fallbackRuleSets);
const FontTraitsMask* weightFallbackRule = weightFallbackRuleSets[ruleSetIndex];
for (unsigned i = 0; i < rulesPerSet; ++i) {
if (secondTraitsMask & weightFallbackRule[i])
return false;
if (firstTraitsMask & weightFallbackRule[i])
return true;
}
return false;
}
FontRanges CSSFontSelector::fontRangesForFamily(const FontDescription& fontDescription, const AtomicString& familyName)
{
bool resolveGenericFamilyFirst = familyName == standardFamily;
AtomicString familyForLookup = resolveGenericFamilyFirst ? resolveGenericFamily(m_document, fontDescription, familyName) : familyName;
CSSSegmentedFontFace* face = getFontFace(fontDescription, familyForLookup);
if (!face) {
if (!resolveGenericFamilyFirst)
familyForLookup = resolveGenericFamily(m_document, fontDescription, familyName);
return FontRanges(FontCache::singleton().fontForFamily(fontDescription, familyForLookup));
}
return face->fontRanges(fontDescription);
}
CSSSegmentedFontFace* CSSFontSelector::getFontFace(const FontDescription& fontDescription, const AtomicString& family)
{
Vector<RefPtr<CSSFontFace>>* familyFontFaces = m_fontFaces.get(family);
if (!familyFontFaces || familyFontFaces->isEmpty())
return 0;
std::unique_ptr<HashMap<unsigned, RefPtr<CSSSegmentedFontFace>>>& segmentedFontFaceCache = m_fonts.add(family, nullptr).iterator->value;
if (!segmentedFontFaceCache)
segmentedFontFaceCache = std::make_unique<HashMap<unsigned, RefPtr<CSSSegmentedFontFace>>>();
FontTraitsMask traitsMask = fontDescription.traitsMask();
RefPtr<CSSSegmentedFontFace>& face = segmentedFontFaceCache->add(traitsMask, nullptr).iterator->value;
if (!face) {
face = CSSSegmentedFontFace::create(this);
Vector<CSSFontFace*, 32> candidateFontFaces;
for (int i = familyFontFaces->size() - 1; i >= 0; --i) {
CSSFontFace* candidate = familyFontFaces->at(i).get();
unsigned candidateTraitsMask = candidate->traitsMask();
if ((traitsMask & FontStyleNormalMask) && !(candidateTraitsMask & FontStyleNormalMask))
continue;
if ((traitsMask & FontVariantNormalMask) && !(candidateTraitsMask & FontVariantNormalMask))
continue;
#if ENABLE(SVG_FONTS)
if (candidate->hasSVGFontFaceSource() && (traitsMask & FontVariantSmallCapsMask) && !(candidateTraitsMask & FontVariantSmallCapsMask))
continue;
#endif
candidateFontFaces.append(candidate);
}
if (Vector<RefPtr<CSSFontFace>>* familyLocallyInstalledFontFaces = m_locallyInstalledFontFaces.get(family)) {
unsigned numLocallyInstalledFontFaces = familyLocallyInstalledFontFaces->size();
for (unsigned i = 0; i < numLocallyInstalledFontFaces; ++i) {
CSSFontFace* candidate = familyLocallyInstalledFontFaces->at(i).get();
unsigned candidateTraitsMask = candidate->traitsMask();
if ((traitsMask & FontStyleNormalMask) && !(candidateTraitsMask & FontStyleNormalMask))
continue;
if ((traitsMask & FontVariantNormalMask) && !(candidateTraitsMask & FontVariantNormalMask))
continue;
candidateFontFaces.append(candidate);
}
}
desiredTraitsMaskForComparison = traitsMask;
std::stable_sort(candidateFontFaces.begin(), candidateFontFaces.end(), compareFontFaces);
unsigned numCandidates = candidateFontFaces.size();
for (unsigned i = 0; i < numCandidates; ++i)
face->appendFontFace(candidateFontFaces[i]);
}
return face.get();
}
void CSSFontSelector::clearDocument()
{
if (!m_document) {
ASSERT(!m_beginLoadingTimer.isActive());
ASSERT(m_fontsToBeginLoading.isEmpty());
return;
}
m_beginLoadingTimer.stop();
CachedResourceLoader& cachedResourceLoader = m_document->cachedResourceLoader();
for (auto& fontHandle : m_fontsToBeginLoading) {
cachedResourceLoader.decrementRequestCount(fontHandle.get());
}
m_fontsToBeginLoading.clear();
m_document = nullptr;
}
void CSSFontSelector::beginLoadingFontSoon(CachedFont* font)
{
if (!m_document)
return;
m_fontsToBeginLoading.append(font);
m_document->cachedResourceLoader().incrementRequestCount(font);
m_beginLoadingTimer.startOneShot(0);
}
void CSSFontSelector::beginLoadTimerFired()
{
Vector<CachedResourceHandle<CachedFont>> fontsToBeginLoading;
fontsToBeginLoading.swap(m_fontsToBeginLoading);
Ref<CSSFontSelector> protect(*this);
CachedResourceLoader& cachedResourceLoader = m_document->cachedResourceLoader();
for (auto& fontHandle : fontsToBeginLoading) {
fontHandle->beginLoadIfNeeded(cachedResourceLoader);
cachedResourceLoader.decrementRequestCount(fontHandle.get());
}
cachedResourceLoader.loadDone(nullptr);
if (m_document && m_document->frame())
m_document->frame()->loader().checkLoadComplete();
}
bool CSSFontSelector::resolvesFamilyFor(const FontDescription& description) const
{
for (unsigned i = 0; i < description.familyCount(); ++i) {
const AtomicString& familyName = description.familyAt(i);
if (familyName.isEmpty())
continue;
if (m_fontFaces.contains(familyName))
return true;
DEPRECATED_DEFINE_STATIC_LOCAL(String, webkitPrefix, ("-webkit-"));
if (familyName.startsWith(webkitPrefix))
return true;
}
return false;
}
size_t CSSFontSelector::fallbackFontCount()
{
if (!m_document)
return 0;
if (Settings* settings = m_document->settings())
return settings->fontFallbackPrefersPictographs() ? 1 : 0;
return 0;
}
PassRefPtr<Font> CSSFontSelector::fallbackFontAt(const FontDescription& fontDescription, size_t index)
{
ASSERT_UNUSED(index, !index);
if (!m_document)
return nullptr;
Settings* settings = m_document->settings();
if (!settings || !settings->fontFallbackPrefersPictographs())
return nullptr;
return FontCache::singleton().fontForFamily(fontDescription, settings->pictographFontFamily());
}
}