Source/WebCore/css/CSSFontSelector.cpp

   1 /*
   2  * Copyright (C) 2007, 2008, 2011, 2013 Apple Inc. All rights reserved.
   3  *           (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include "config.h"
  28 #include "CSSFontSelector.h"
  29
  30 #include "CachedFont.h"
  31 #include "CSSFontFace.h"
  32 #include "CSSFontFaceRule.h"
  33 #include "CSSFontFaceSource.h"
  34 #include "CSSFontFaceSrcValue.h"
  35 #include "CSSPrimitiveValue.h"
  36 #include "CSSPropertyNames.h"
  37 #include "CSSSegmentedFontFace.h"
  38 #include "CSSUnicodeRangeValue.h"
  39 #include "CSSValueKeywords.h"
  40 #include "CSSValueList.h"
  41 #include "CachedResourceLoader.h"
  42 #include "Document.h"
  43 #include "FontCache.h"
  44 #include "Frame.h"
  45 #include "FrameLoader.h"
  46 #include "SVGFontFaceElement.h"
  47 #include "SVGNames.h"
  48 #include "Settings.h"
  49 #include "SimpleFontData.h"
  50 #include "StyleProperties.h"
  51 #include "StyleResolver.h"
  52 #include "StyleRule.h"
  53 #include "WebKitFontFamilyNames.h"
  54 #include <wtf/Ref.h>
  55 #include <wtf/text/AtomicString.h>
  56
  57 namespace WebCore {
  58
  59 static unsigned fontSelectorId;
  60
  61 CSSFontSelector::CSSFontSelector(Document* document)
  62     : m_document(document)
  63     , m_beginLoadingTimer(this, &CSSFontSelector::beginLoadTimerFired)
  64     , m_uniqueId(++fontSelectorId)
  65     , m_version(0)
  66
  67 {
  68     // FIXME: An old comment used to say there was no need to hold a reference to m_document
  69     // because "we are guaranteed to be destroyed before the document". But there does not
  70     // seem to be any such guarantee.
  71
  72     ASSERT(m_document);
  73     fontCache().addClient(this);
  74 }
  75
  76 CSSFontSelector::~CSSFontSelector()
  77 {
  78     clearDocument();
  79     fontCache().removeClient(this);
  80 }
  81
  82 bool CSSFontSelector::isEmpty() const
  83 {
  84     return m_fonts.isEmpty();
  85 }
  86
  87 void CSSFontSelector::addFontFaceRule(const StyleRuleFontFace* fontFaceRule)
  88 {
  89     // Obtain the font-family property and the src property.  Both must be defined.
  90     const StyleProperties& style = fontFaceRule->properties();
  91     RefPtr<CSSValue> fontFamily = style.getPropertyCSSValue(CSSPropertyFontFamily);
  92     RefPtr<CSSValue> src = style.getPropertyCSSValue(CSSPropertySrc);
  93     RefPtr<CSSValue> unicodeRange = style.getPropertyCSSValue(CSSPropertyUnicodeRange);
  94     if (!is<CSSValueList>(fontFamily.get()) || !is<CSSValueList>(src.get()) || (unicodeRange && !is<CSSValueList>(*unicodeRange)))
  95         return;
  96
  97     CSSValueList& familyList = downcast<CSSValueList>(*fontFamily);
  98     if (!familyList.length())
  99         return;
 100
 101     CSSValueList& srcList = downcast<CSSValueList>(*src);
 102     if (!srcList.length())
 103         return;
 104
 105     CSSValueList* rangeList = downcast<CSSValueList>(unicodeRange.get());
 106
 107     unsigned traitsMask = 0;
 108
 109     if (RefPtr<CSSValue> fontStyle = style.getPropertyCSSValue(CSSPropertyFontStyle)) {
 110         if (!is<CSSPrimitiveValue>(*fontStyle))
 111             return;
 112
 113         switch (downcast<CSSPrimitiveValue>(*fontStyle).getValueID()) {
 114         case CSSValueNormal:
 115             traitsMask |= FontStyleNormalMask;
 116             break;
 117         case CSSValueItalic:
 118         case CSSValueOblique:
 119             traitsMask |= FontStyleItalicMask;
 120             break;
 121         default:
 122             break;
 123         }
 124     } else
 125         traitsMask |= FontStyleNormalMask;
 126
 127     if (RefPtr<CSSValue> fontWeight = style.getPropertyCSSValue(CSSPropertyFontWeight)) {
 128         if (!is<CSSPrimitiveValue>(*fontWeight))
 129             return;
 130
 131         switch (downcast<CSSPrimitiveValue>(*fontWeight).getValueID()) {
 132         case CSSValueBold:
 133         case CSSValue700:
 134             traitsMask |= FontWeight700Mask;
 135             break;
 136         case CSSValueNormal:
 137         case CSSValue400:
 138             traitsMask |= FontWeight400Mask;
 139             break;
 140         case CSSValue900:
 141             traitsMask |= FontWeight900Mask;
 142             break;
 143         case CSSValue800:
 144             traitsMask |= FontWeight800Mask;
 145             break;
 146         case CSSValue600:
 147             traitsMask |= FontWeight600Mask;
 148             break;
 149         case CSSValue500:
 150             traitsMask |= FontWeight500Mask;
 151             break;
 152         case CSSValue300:
 153             traitsMask |= FontWeight300Mask;
 154             break;
 155         case CSSValue200:
 156             traitsMask |= FontWeight200Mask;
 157             break;
 158         case CSSValue100:
 159             traitsMask |= FontWeight100Mask;
 160             break;
 161         default:
 162             break;
 163         }
 164     } else
 165         traitsMask |= FontWeight400Mask;
 166
 167     if (RefPtr<CSSValue> fontVariant = style.getPropertyCSSValue(CSSPropertyFontVariant)) {
 168         // font-variant descriptor can be a value list.
 169         if (fontVariant->isPrimitiveValue()) {
 170             RefPtr<CSSValueList> list = CSSValueList::createCommaSeparated();
 171             list->append(fontVariant.releaseNonNull());
 172             fontVariant = list.releaseNonNull();
 173         } else if (!is<CSSValueList>(*fontVariant))
 174             return;
 175
 176         CSSValueList& variantList = downcast<CSSValueList>(*fontVariant);
 177         unsigned numVariants = variantList.length();
 178         if (!numVariants)
 179             return;
 180
 181         for (unsigned i = 0; i < numVariants; ++i) {
 182             switch (downcast<CSSPrimitiveValue>(variantList.itemWithoutBoundsCheck(i))->getValueID()) {
 183                 case CSSValueNormal:
 184                     traitsMask |= FontVariantNormalMask;
 185                     break;
 186                 case CSSValueSmallCaps:
 187                     traitsMask |= FontVariantSmallCapsMask;
 188                     break;
 189                 default:
 190                     break;
 191             }
 192         }
 193     } else
 194         traitsMask |= FontVariantMask;
 195
 196     // Each item in the src property's list is a single CSSFontFaceSource. Put them all into a CSSFontFace.
 197     RefPtr<CSSFontFace> fontFace;
 198
 199     int srcLength = srcList.length();
 200
 201     bool foundSVGFont = false;
 202
 203     for (int i = 0; i < srcLength; i++) {
 204         // An item in the list either specifies a string (local font name) or a URL (remote font to download).
 205         CSSFontFaceSrcValue& item = downcast<CSSFontFaceSrcValue>(*srcList.itemWithoutBoundsCheck(i));
 206         std::unique_ptr<CSSFontFaceSource> source;
 207
 208 #if ENABLE(SVG_FONTS)
 209         foundSVGFont = item.isSVGFontFaceSrc() || item.svgFontFaceElement();
 210 #endif
 211         if (!item.isLocal()) {
 212             Settings* settings = m_document ? m_document->frame() ? &m_document->frame()->settings() : 0 : 0;
 213             bool allowDownloading = foundSVGFont || (settings && settings->downloadableBinaryFontsEnabled());
 214             if (allowDownloading && item.isSupportedFormat() && m_document) {
 215                 CachedFont* cachedFont = item.cachedFont(m_document, foundSVGFont);
 216                 if (cachedFont) {
 217                     source = std::make_unique<CSSFontFaceSource>(item.resource(), cachedFont);
 218 #if ENABLE(SVG_FONTS)
 219                     if (foundSVGFont)
 220                         source->setHasExternalSVGFont();
 221 #endif
 222                 }
 223             }
 224         } else {
 225             source = std::make_unique<CSSFontFaceSource>(item.resource());
 226         }
 227
 228         if (!fontFace) {
 229             RefPtr<CSSFontFaceRule> rule;
 230 #if ENABLE(FONT_LOAD_EVENTS)
 231             // FIXME: https://bugs.webkit.org/show_bug.cgi?id=112116 - This CSSFontFaceRule has no parent.
 232             if (RuntimeEnabledFeatures::sharedFeatures().fontLoadEventsEnabled())
 233                 rule = static_pointer_cast<CSSFontFaceRule>(fontFaceRule->createCSSOMWrapper());
 234 #endif
 235             fontFace = CSSFontFace::create(static_cast<FontTraitsMask>(traitsMask), rule);
 236         }
 237
 238         if (source) {
 239 #if ENABLE(SVG_FONTS)
 240             source->setSVGFontFaceElement(item.svgFontFaceElement());
 241 #endif
 242             fontFace->addSource(WTF::move(source));
 243         }
 244     }
 245
 246     ASSERT(fontFace);
 247
 248     if (fontFace && !fontFace->isValid())
 249         return;
 250
 251     if (rangeList) {
 252         unsigned numRanges = rangeList->length();
 253         for (unsigned i = 0; i < numRanges; i++) {
 254             CSSUnicodeRangeValue& range = downcast<CSSUnicodeRangeValue>(*rangeList->itemWithoutBoundsCheck(i));
 255             fontFace->addRange(range.from(), range.to());
 256         }
 257     }
 258
 259     // Hash under every single family name.
 260     int familyLength = familyList.length();
 261     for (int i = 0; i < familyLength; i++) {
 262         CSSPrimitiveValue* item = downcast<CSSPrimitiveValue>(familyList.itemWithoutBoundsCheck(i));
 263         String familyName;
 264         if (item->isString()) {
 265             familyName = item->getStringValue();
 266         } else if (item->isValueID()) {
 267             // We need to use the raw text for all the generic family types, since @font-face is a way of actually
 268             // defining what font to use for those types.
 269             switch (item->getValueID()) {
 270                 case CSSValueSerif:
 271                     familyName = serifFamily;
 272                     break;
 273                 case CSSValueSansSerif:
 274                     familyName = sansSerifFamily;
 275                     break;
 276                 case CSSValueCursive:
 277                     familyName = cursiveFamily;
 278                     break;
 279                 case CSSValueFantasy:
 280                     familyName = fantasyFamily;
 281                     break;
 282                 case CSSValueMonospace:
 283                     familyName = monospaceFamily;
 284                     break;
 285                 case CSSValueWebkitPictograph:
 286                     familyName = pictographFamily;
 287                     break;
 288                 default:
 289                     break;
 290             }
 291         }
 292
 293         if (familyName.isEmpty())
 294             continue;
 295
 296         std::unique_ptr<Vector<RefPtr<CSSFontFace>>>& familyFontFaces = m_fontFaces.add(familyName, nullptr).iterator->value;
 297         if (!familyFontFaces) {
 298             familyFontFaces = std::make_unique<Vector<RefPtr<CSSFontFace>>>();
 299
 300             ASSERT(!m_locallyInstalledFontFaces.contains(familyName));
 301
 302             Vector<unsigned> locallyInstalledFontsTraitsMasks;
 303             fontCache().getTraitsInFamily(familyName, locallyInstalledFontsTraitsMasks);
 304             if (unsigned numLocallyInstalledFaces = locallyInstalledFontsTraitsMasks.size()) {
 305                 auto familyLocallyInstalledFaces = std::make_unique<Vector<RefPtr<CSSFontFace>>>();
 306
 307                 for (unsigned i = 0; i < numLocallyInstalledFaces; ++i) {
 308                     RefPtr<CSSFontFace> locallyInstalledFontFace = CSSFontFace::create(static_cast<FontTraitsMask>(locallyInstalledFontsTraitsMasks[i]), 0, true);
 309                     locallyInstalledFontFace->addSource(std::make_unique<CSSFontFaceSource>(familyName));
 310                     ASSERT(locallyInstalledFontFace->isValid());
 311                     familyLocallyInstalledFaces->append(locallyInstalledFontFace);
 312                 }
 313
 314                 m_locallyInstalledFontFaces.set(familyName, WTF::move(familyLocallyInstalledFaces));
 315             }
 316         }
 317
 318         familyFontFaces->append(fontFace);
 319
 320         ++m_version;
 321     }
 322 }
 323
 324 void CSSFontSelector::registerForInvalidationCallbacks(FontSelectorClient* client)
 325 {
 326     m_clients.add(client);
 327 }
 328
 329 void CSSFontSelector::unregisterForInvalidationCallbacks(FontSelectorClient* client)
 330 {
 331     m_clients.remove(client);
 332 }
 333
 334 void CSSFontSelector::dispatchInvalidationCallbacks()
 335 {
 336     ++m_version;
 337
 338     Vector<FontSelectorClient*> clients;
 339     copyToVector(m_clients, clients);
 340     for (size_t i = 0; i < clients.size(); ++i)
 341         clients[i]->fontsNeedUpdate(this);
 342
 343     // FIXME: Make Document a FontSelectorClient so that it can simply register for invalidation callbacks.
 344     if (!m_document)
 345         return;
 346     if (StyleResolver* styleResolver = m_document->styleResolverIfExists())
 347         styleResolver->invalidateMatchedPropertiesCache();
 348     if (m_document->inPageCache() || !m_document->renderView())
 349         return;
 350     m_document->scheduleForcedStyleRecalc();
 351 }
 352
 353 void CSSFontSelector::fontLoaded()
 354 {
 355     dispatchInvalidationCallbacks();
 356 }
 357
 358 void CSSFontSelector::fontCacheInvalidated()
 359 {
 360     dispatchInvalidationCallbacks();
 361 }
 362
 363 static PassRefPtr<SimpleFontData> fontDataForGenericFamily(Document* document, const FontDescription& fontDescription, const AtomicString& familyName)
 364 {
 365     if (!document || !document->frame())
 366         return 0;
 367
 368     const Settings& settings = document->frame()->settings();
 369
 370     AtomicString genericFamily;
 371     UScriptCode script = fontDescription.script();
 372
 373     if (familyName == serifFamily)
 374         genericFamily = settings.serifFontFamily(script);
 375     else if (familyName == sansSerifFamily)
 376         genericFamily = settings.sansSerifFontFamily(script);
 377     else if (familyName == cursiveFamily)
 378         genericFamily = settings.cursiveFontFamily(script);
 379     else if (familyName == fantasyFamily)
 380         genericFamily = settings.fantasyFontFamily(script);
 381     else if (familyName == monospaceFamily)
 382         genericFamily = settings.fixedFontFamily(script);
 383     else if (familyName == pictographFamily)
 384         genericFamily = settings.pictographFontFamily(script);
 385     else if (familyName == standardFamily)
 386         genericFamily = settings.standardFontFamily(script);
 387
 388     if (!genericFamily.isEmpty())
 389         return fontCache().getCachedFontData(fontDescription, genericFamily);
 390
 391     return nullptr;
 392 }
 393
 394 static FontTraitsMask desiredTraitsMaskForComparison;
 395
 396 static inline bool compareFontFaces(CSSFontFace* first, CSSFontFace* second)
 397 {
 398     FontTraitsMask firstTraitsMask = first->traitsMask();
 399     FontTraitsMask secondTraitsMask = second->traitsMask();
 400
 401     bool firstHasDesiredVariant = firstTraitsMask & desiredTraitsMaskForComparison & FontVariantMask;
 402     bool secondHasDesiredVariant = secondTraitsMask & desiredTraitsMaskForComparison & FontVariantMask;
 403
 404     if (firstHasDesiredVariant != secondHasDesiredVariant)
 405         return firstHasDesiredVariant;
 406
 407     // We need to check font-variant css property for CSS2.1 compatibility.
 408     if ((desiredTraitsMaskForComparison & FontVariantSmallCapsMask) && !first->isLocalFallback() && !second->isLocalFallback()) {
 409         // Prefer a font that has indicated that it can only support small-caps to a font that claims to support
 410         // all variants.  The specialized font is more likely to be true small-caps and not require synthesis.
 411         bool firstRequiresSmallCaps = (firstTraitsMask & FontVariantSmallCapsMask) && !(firstTraitsMask & FontVariantNormalMask);
 412         bool secondRequiresSmallCaps = (secondTraitsMask & FontVariantSmallCapsMask) && !(secondTraitsMask & FontVariantNormalMask);
 413         if (firstRequiresSmallCaps != secondRequiresSmallCaps)
 414             return firstRequiresSmallCaps;
 415     }
 416
 417     bool firstHasDesiredStyle = firstTraitsMask & desiredTraitsMaskForComparison & FontStyleMask;
 418     bool secondHasDesiredStyle = secondTraitsMask & desiredTraitsMaskForComparison & FontStyleMask;
 419
 420     if (firstHasDesiredStyle != secondHasDesiredStyle)
 421         return firstHasDesiredStyle;
 422
 423     if ((desiredTraitsMaskForComparison & FontStyleItalicMask) && !first->isLocalFallback() && !second->isLocalFallback()) {
 424         // Prefer a font that has indicated that it can only support italics to a font that claims to support
 425         // all styles.  The specialized font is more likely to be the one the author wants used.
 426         bool firstRequiresItalics = (firstTraitsMask & FontStyleItalicMask) && !(firstTraitsMask & FontStyleNormalMask);
 427         bool secondRequiresItalics = (secondTraitsMask & FontStyleItalicMask) && !(secondTraitsMask & FontStyleNormalMask);
 428         if (firstRequiresItalics != secondRequiresItalics)
 429             return firstRequiresItalics;
 430     }
 431
 432     if (secondTraitsMask & desiredTraitsMaskForComparison & FontWeightMask)
 433         return false;
 434     if (firstTraitsMask & desiredTraitsMaskForComparison & FontWeightMask)
 435         return true;
 436
 437     // http://www.w3.org/TR/2011/WD-css3-fonts-20111004/#font-matching-algorithm says :
 438     //   - If the desired weight is less than 400, weights below the desired weight are checked in descending order followed by weights above the desired weight in ascending order until a match is found.
 439     //   - If the desired weight is greater than 500, weights above the desired weight are checked in ascending order followed by weights below the desired weight in descending order until a match is found.
 440     //   - If the desired weight is 400, 500 is checked first and then the rule for desired weights less than 400 is used.
 441     //   - If the desired weight is 500, 400 is checked first and then the rule for desired weights less than 400 is used.
 442
 443     static const unsigned fallbackRuleSets = 9;
 444     static const unsigned rulesPerSet = 8;
 445     static const FontTraitsMask weightFallbackRuleSets[fallbackRuleSets][rulesPerSet] = {
 446         { FontWeight200Mask, FontWeight300Mask, FontWeight400Mask, FontWeight500Mask, FontWeight600Mask, FontWeight700Mask, FontWeight800Mask, FontWeight900Mask },
 447         { FontWeight100Mask, FontWeight300Mask, FontWeight400Mask, FontWeight500Mask, FontWeight600Mask, FontWeight700Mask, FontWeight800Mask, FontWeight900Mask },
 448         { FontWeight200Mask, FontWeight100Mask, FontWeight400Mask, FontWeight500Mask, FontWeight600Mask, FontWeight700Mask, FontWeight800Mask, FontWeight900Mask },
 449         { FontWeight500Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask, FontWeight600Mask, FontWeight700Mask, FontWeight800Mask, FontWeight900Mask },
 450         { FontWeight400Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask, FontWeight600Mask, FontWeight700Mask, FontWeight800Mask, FontWeight900Mask },
 451         { FontWeight700Mask, FontWeight800Mask, FontWeight900Mask, FontWeight500Mask, FontWeight400Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask },
 452         { FontWeight800Mask, FontWeight900Mask, FontWeight600Mask, FontWeight500Mask, FontWeight400Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask },
 453         { FontWeight900Mask, FontWeight700Mask, FontWeight600Mask, FontWeight500Mask, FontWeight400Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask },
 454         { FontWeight800Mask, FontWeight700Mask, FontWeight600Mask, FontWeight500Mask, FontWeight400Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask }
 455     };
 456
 457     unsigned ruleSetIndex = 0;
 458     unsigned w = FontWeight100Bit;
 459     while (!(desiredTraitsMaskForComparison & (1 << w))) {
 460         w++;
 461         ruleSetIndex++;
 462     }
 463
 464     ASSERT_WITH_SECURITY_IMPLICATION(ruleSetIndex < fallbackRuleSets);
 465     const FontTraitsMask* weightFallbackRule = weightFallbackRuleSets[ruleSetIndex];
 466     for (unsigned i = 0; i < rulesPerSet; ++i) {
 467         if (secondTraitsMask & weightFallbackRule[i])
 468             return false;
 469         if (firstTraitsMask & weightFallbackRule[i])
 470             return true;
 471     }
 472
 473     return false;
 474 }
 475
 476 PassRefPtr<FontData> CSSFontSelector::getFontData(const FontDescription& fontDescription, const AtomicString& familyName)
 477 {
 478     if (m_fontFaces.isEmpty()) {
 479         if (familyName.startsWith("-webkit-"))
 480             return fontDataForGenericFamily(m_document, fontDescription, familyName);
 481         if (fontDescription.genericFamily() == FontDescription::StandardFamily && !fontDescription.isSpecifiedFont())
 482             return fontDataForGenericFamily(m_document, fontDescription, standardFamily);
 483         return 0;
 484     }
 485
 486     CSSSegmentedFontFace* face = getFontFace(fontDescription, familyName);
 487     // If no face was found, then return 0 and let the OS come up with its best match for the name.
 488     if (!face) {
 489         // If we were handed a generic family, but there was no match, go ahead and return the correct font based off our
 490         // settings.
 491         if (fontDescription.genericFamily() == FontDescription::StandardFamily && !fontDescription.isSpecifiedFont())
 492             return fontDataForGenericFamily(m_document, fontDescription, standardFamily);
 493         return fontDataForGenericFamily(m_document, fontDescription, familyName);
 494     }
 495
 496     // We have a face. Ask it for a font data. If it cannot produce one, it will fail, and the OS will take over.
 497     return face->getFontData(fontDescription);
 498 }
 499
 500 CSSSegmentedFontFace* CSSFontSelector::getFontFace(const FontDescription& fontDescription, const AtomicString& family)
 501 {
 502     Vector<RefPtr<CSSFontFace>>* familyFontFaces = m_fontFaces.get(family);
 503     if (!familyFontFaces || familyFontFaces->isEmpty())
 504         return 0;
 505
 506     std::unique_ptr<HashMap<unsigned, RefPtr<CSSSegmentedFontFace>>>& segmentedFontFaceCache = m_fonts.add(family, nullptr).iterator->value;
 507     if (!segmentedFontFaceCache)
 508         segmentedFontFaceCache = std::make_unique<HashMap<unsigned, RefPtr<CSSSegmentedFontFace>>>();
 509
 510     FontTraitsMask traitsMask = fontDescription.traitsMask();
 511
 512     RefPtr<CSSSegmentedFontFace>& face = segmentedFontFaceCache->add(traitsMask, nullptr).iterator->value;
 513     if (!face) {
 514         face = CSSSegmentedFontFace::create(this);
 515
 516         // Collect all matching faces and sort them in order of preference.
 517         Vector<CSSFontFace*, 32> candidateFontFaces;
 518         for (int i = familyFontFaces->size() - 1; i >= 0; --i) {
 519             CSSFontFace* candidate = familyFontFaces->at(i).get();
 520             unsigned candidateTraitsMask = candidate->traitsMask();
 521             if ((traitsMask & FontStyleNormalMask) && !(candidateTraitsMask & FontStyleNormalMask))
 522                 continue;
 523             if ((traitsMask & FontVariantNormalMask) && !(candidateTraitsMask & FontVariantNormalMask))
 524                 continue;
 525 #if ENABLE(SVG_FONTS)
 526             // For SVG Fonts that specify that they only support the "normal" variant, we will assume they are incapable
 527             // of small-caps synthesis and just ignore the font face as a candidate.
 528             if (candidate->hasSVGFontFaceSource() && (traitsMask & FontVariantSmallCapsMask) && !(candidateTraitsMask & FontVariantSmallCapsMask))
 529                 continue;
 530 #endif
 531             candidateFontFaces.append(candidate);
 532         }
 533
 534         if (Vector<RefPtr<CSSFontFace>>* familyLocallyInstalledFontFaces = m_locallyInstalledFontFaces.get(family)) {
 535             unsigned numLocallyInstalledFontFaces = familyLocallyInstalledFontFaces->size();
 536             for (unsigned i = 0; i < numLocallyInstalledFontFaces; ++i) {
 537                 CSSFontFace* candidate = familyLocallyInstalledFontFaces->at(i).get();
 538                 unsigned candidateTraitsMask = candidate->traitsMask();
 539                 if ((traitsMask & FontStyleNormalMask) && !(candidateTraitsMask & FontStyleNormalMask))
 540                     continue;
 541                 if ((traitsMask & FontVariantNormalMask) && !(candidateTraitsMask & FontVariantNormalMask))
 542                     continue;
 543                 candidateFontFaces.append(candidate);
 544             }
 545         }
 546
 547         desiredTraitsMaskForComparison = traitsMask;
 548         std::stable_sort(candidateFontFaces.begin(), candidateFontFaces.end(), compareFontFaces);
 549         unsigned numCandidates = candidateFontFaces.size();
 550         for (unsigned i = 0; i < numCandidates; ++i)
 551             face->appendFontFace(candidateFontFaces[i]);
 552     }
 553     return face.get();
 554 }
 555
 556 void CSSFontSelector::clearDocument()
 557 {
 558     if (!m_document) {
 559         ASSERT(!m_beginLoadingTimer.isActive());
 560         ASSERT(m_fontsToBeginLoading.isEmpty());
 561         return;
 562     }
 563
 564     m_beginLoadingTimer.stop();
 565
 566     CachedResourceLoader* cachedResourceLoader = m_document->cachedResourceLoader();
 567     for (size_t i = 0; i < m_fontsToBeginLoading.size(); ++i) {
 568         // Balances incrementRequestCount() in beginLoadingFontSoon().
 569         cachedResourceLoader->decrementRequestCount(m_fontsToBeginLoading[i].get());
 570     }
 571
 572     m_fontsToBeginLoading.clear();
 573
 574     m_document = 0;
 575 }
 576
 577 void CSSFontSelector::beginLoadingFontSoon(CachedFont* font)
 578 {
 579     if (!m_document)
 580         return;
 581
 582     m_fontsToBeginLoading.append(font);
 583     // Increment the request count now, in order to prevent didFinishLoad from being dispatched
 584     // after this font has been requested but before it began loading. Balanced by
 585     // decrementRequestCount() in beginLoadTimerFired() and in clearDocument().
 586     m_document->cachedResourceLoader()->incrementRequestCount(font);
 587     m_beginLoadingTimer.startOneShot(0);
 588 }
 589
 590 void CSSFontSelector::beginLoadTimerFired(Timer&)
 591 {
 592     Vector<CachedResourceHandle<CachedFont>> fontsToBeginLoading;
 593     fontsToBeginLoading.swap(m_fontsToBeginLoading);
 594
 595     // CSSFontSelector could get deleted via beginLoadIfNeeded() or loadDone() unless protected.
 596     Ref<CSSFontSelector> protect(*this);
 597
 598     CachedResourceLoader* cachedResourceLoader = m_document->cachedResourceLoader();
 599     for (size_t i = 0; i < fontsToBeginLoading.size(); ++i) {
 600         fontsToBeginLoading[i]->beginLoadIfNeeded(cachedResourceLoader);
 601         // Balances incrementRequestCount() in beginLoadingFontSoon().
 602         cachedResourceLoader->decrementRequestCount(fontsToBeginLoading[i].get());
 603     }
 604     // Ensure that if the request count reaches zero, the frame loader will know about it.
 605     cachedResourceLoader->loadDone(0);
 606     // New font loads may be triggered by layout after the document load is complete but before we have dispatched
 607     // didFinishLoading for the frame. Make sure the delegate is always dispatched by checking explicitly.
 608     if (m_document && m_document->frame())
 609         m_document->frame()->loader().checkLoadComplete();
 610 }
 611
 612 bool CSSFontSelector::resolvesFamilyFor(const FontDescription& description) const
 613 {
 614     for (unsigned i = 0; i < description.familyCount(); ++i) {
 615         const AtomicString& familyName = description.familyAt(i);
 616         if (description.genericFamily() == FontDescription::StandardFamily && !description.isSpecifiedFont())
 617             return true;
 618         if (familyName.isEmpty())
 619             continue;
 620         if (m_fontFaces.contains(familyName))
 621             return true;
 622         DEPRECATED_DEFINE_STATIC_LOCAL(String, webkitPrefix, ("-webkit-"));
 623         if (familyName.startsWith(webkitPrefix))
 624             return true;
 625
 626     }
 627     return false;
 628 }
 629
 630 size_t CSSFontSelector::fallbackFontDataCount()
 631 {
 632     if (!m_document)
 633         return 0;
 634
 635     if (Settings* settings = m_document->settings())
 636         return settings->fontFallbackPrefersPictographs() ? 1 : 0;
 637
 638     return 0;
 639 }
 640
 641 PassRefPtr<FontData> CSSFontSelector::getFallbackFontData(const FontDescription& fontDescription, size_t index)
 642 {
 643     ASSERT_UNUSED(index, !index);
 644
 645     if (!m_document)
 646         return 0;
 647
 648     Settings* settings = m_document->settings();
 649     if (!settings || !settings->fontFallbackPrefersPictographs())
 650         return 0;
 651
 652     return fontCache().getCachedFontData(fontDescription, settings->pictographFontFamily());
 653 }
 654
 655 }