gfx/thebes/gfxPlatformFontList.h

   1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef GFXPLATFORMFONTLIST_H_
   7 #define GFXPLATFORMFONTLIST_H_
   8
   9 #include "nsClassHashtable.h"
  10 #include "nsTHashMap.h"
  11 #include "nsTHashSet.h"
  12 #include "nsRefPtrHashtable.h"
  13 #include "nsTHashtable.h"
  14
  15 #include "gfxFontUtils.h"
  16 #include "gfxFontInfoLoader.h"
  17 #include "gfxFont.h"
  18 #include "gfxFontConstants.h"
  19 #include "gfxPlatform.h"
  20 #include "SharedFontList.h"
  21
  22 #include "nsIMemoryReporter.h"
  23 #include "mozilla/Attributes.h"
  24 #include "mozilla/EnumeratedArray.h"
  25 #include "mozilla/FontPropertyTypes.h"
  26 #include "mozilla/MemoryReporting.h"
  27 #include "mozilla/RangedArray.h"
  28 #include "mozilla/RecursiveMutex.h"
  29 #include "nsLanguageAtomService.h"
  30
  31 #include "base/shared_memory.h"
  32
  33 namespace mozilla {
  34 namespace fontlist {
  35 struct AliasData;
  36 }
  37 }  // namespace mozilla
  38
  39 class CharMapHashKey : public PLDHashEntryHdr {
  40  public:
  41   typedef gfxCharacterMap* KeyType;
  42   typedef const gfxCharacterMap* KeyTypePointer;
  43
  44   explicit CharMapHashKey(const gfxCharacterMap* aCharMap)
  45       : mCharMap(const_cast<gfxCharacterMap*>(aCharMap)) {
  46     MOZ_COUNT_CTOR(CharMapHashKey);
  47   }
  48   CharMapHashKey(const CharMapHashKey& toCopy) : mCharMap(toCopy.mCharMap) {
  49     MOZ_COUNT_CTOR(CharMapHashKey);
  50   }
  51   MOZ_COUNTED_DTOR(CharMapHashKey)
  52
  53   gfxCharacterMap* GetKey() const { return mCharMap; }
  54
  55   bool KeyEquals(const gfxCharacterMap* aCharMap) const {
  56     NS_ASSERTION(!aCharMap->mBuildOnTheFly && !mCharMap->mBuildOnTheFly,
  57                  "custom cmap used in shared cmap hashtable");
  58     // cmaps built on the fly never match
  59     if (aCharMap->mHash != mCharMap->mHash) {
  60       return false;
  61     }
  62     return mCharMap->Equals(aCharMap);
  63   }
  64
  65   static const gfxCharacterMap* KeyToPointer(gfxCharacterMap* aCharMap) {
  66     return aCharMap;
  67   }
  68   static PLDHashNumber HashKey(const gfxCharacterMap* aCharMap) {
  69     return aCharMap->mHash;
  70   }
  71
  72   enum { ALLOW_MEMMOVE = true };
  73
  74  protected:
  75   // charMaps are not owned by the shared cmap cache, but it will be notified
  76   // by gfxCharacterMap::Release() when an entry is about to be deleted
  77   gfxCharacterMap* MOZ_NON_OWNING_REF mCharMap;
  78 };
  79
  80 /**
  81  * A helper class used to create a SharedBitSet instance in a FontList's shared
  82  * memory, while ensuring that we avoid bloating memory by avoiding creating
  83  * duplicate instances.
  84  */
  85 class ShmemCharMapHashEntry final : public PLDHashEntryHdr {
  86  public:
  87   typedef const gfxSparseBitSet* KeyType;
  88   typedef const gfxSparseBitSet* KeyTypePointer;
  89
  90   /**
  91    * Creation from a gfxSparseBitSet creates not only the ShmemCharMapHashEntry
  92    * itself, but also a SharedBitSet in shared memory.
  93    * Only the parent process creates and manages these entries.
  94    */
  95   explicit ShmemCharMapHashEntry(const gfxSparseBitSet* aCharMap);
  96
  97   ShmemCharMapHashEntry(ShmemCharMapHashEntry&&) = default;
  98   ShmemCharMapHashEntry& operator=(ShmemCharMapHashEntry&&) = default;
  99
 100   /**
 101    * Return a shared-memory Pointer that refers to the wrapped SharedBitSet.
 102    * This can be passed to content processes to give them access to the same
 103    * SharedBitSet as the parent stored.
 104    */
 105   mozilla::fontlist::Pointer GetCharMap() const { return mCharMap; }
 106
 107   bool KeyEquals(KeyType aCharMap) const {
 108     // mHash is a 32-bit Adler checksum of the bitset; if it doesn't match we
 109     // can immediately reject it as non-matching, but if it is equal we still
 110     // need to do a full equality check below.
 111     if (mHash != aCharMap->GetChecksum()) {
 112       return false;
 113     }
 114
 115     return static_cast<const SharedBitSet*>(mCharMap.ToPtr(mList))
 116         ->Equals(aCharMap);
 117   }
 118
 119   static KeyTypePointer KeyToPointer(KeyType aCharMap) { return aCharMap; }
 120   static PLDHashNumber HashKey(KeyType aCharMap) {
 121     return aCharMap->GetChecksum();
 122   }
 123
 124   enum { ALLOW_MEMMOVE = true };
 125
 126  private:
 127   // charMaps are stored in the shared memory that FontList objects point to,
 128   // and are never deleted until the FontList (all referencing font lists,
 129   // actually) have gone away.
 130   mozilla::fontlist::FontList* mList;
 131   mozilla::fontlist::Pointer mCharMap;
 132   uint32_t mHash;
 133 };
 134
 135 // gfxPlatformFontList is an abstract class for the global font list on the
 136 // system; concrete subclasses for each platform implement the actual interface
 137 // to the system fonts. This class exists because we cannot rely on the platform
 138 // font-finding APIs to behave in sensible/similar ways, particularly with rich,
 139 // complex OpenType families, so we do our own font family/style management here
 140 // instead.
 141
 142 // Much of this is based on the old gfxQuartzFontCache, but adapted for use on
 143 // all platforms.
 144
 145 struct FontListSizes {
 146   uint32_t mFontListSize;  // size of the font list and dependent objects
 147                            // (font family and face names, etc), but NOT
 148                            // including the font table cache and the cmaps
 149   uint32_t
 150       mFontTableCacheSize;  // memory used for the gfxFontEntry table caches
 151   uint32_t mCharMapsSize;   // memory used for cmap coverage info
 152   uint32_t mLoaderSize;     // memory used for (platform-specific) loader
 153   uint32_t mSharedSize;     // shared-memory use (reported by parent only)
 154 };
 155
 156 class gfxUserFontSet;
 157
 158 class gfxPlatformFontList : public gfxFontInfoLoader {
 159   friend class InitOtherFamilyNamesRunnable;
 160
 161  public:
 162   typedef mozilla::StretchRange StretchRange;
 163   typedef mozilla::SlantStyleRange SlantStyleRange;
 164   typedef mozilla::WeightRange WeightRange;
 165   typedef mozilla::intl::Script Script;
 166
 167   using AutoLock = mozilla::RecursiveMutexAutoLock;
 168   using AutoUnlock = mozilla::RecursiveMutexAutoUnlock;
 169
 170   // Class used to hold cached copies of the font-name prefs, so that they can
 171   // be accessed from non-main-thread callers who are not allowed to touch the
 172   // Preferences service.
 173   class FontPrefs final {
 174    public:
 175     using HashMap = nsTHashMap<nsCStringHashKey, nsCString>;
 176
 177     FontPrefs();
 178     ~FontPrefs() = default;
 179
 180     FontPrefs(const FontPrefs& aOther) = delete;
 181     FontPrefs& operator=(const FontPrefs& aOther) = delete;
 182
 183     // Lookup the font.name.<foo> or font.name-list.<foo> pref for a given
 184     // generic+langgroup pair.
 185     bool LookupName(const nsACString& aPref, nsACString& aValue) const;
 186     bool LookupNameList(const nsACString& aPref, nsACString& aValue) const;
 187
 188     // Does the font.name-list.emoji pref have a user-set value?
 189     bool EmojiHasUserValue() const { return mEmojiHasUserValue; }
 190
 191     // Expose iterators over all the defined prefs of each type.
 192     HashMap::ConstIterator NameIter() const { return mFontName.ConstIter(); }
 193     HashMap::ConstIterator NameListIter() const {
 194       return mFontNameList.ConstIter();
 195     }
 196
 197    private:
 198     static constexpr char kNamePrefix[] = "font.name.";
 199     static constexpr char kNameListPrefix[] = "font.name-list.";
 200
 201     void Init();
 202
 203     HashMap mFontName;
 204     HashMap mFontNameList;
 205     bool mEmojiHasUserValue = false;
 206   };
 207
 208   // For font family lists loaded from user preferences (prefs such as
 209   // font.name-list.<generic>.<langGroup>) that map CSS generics to
 210   // platform-specific font families.
 211   typedef nsTArray<FontFamily> PrefFontList;
 212
 213   static gfxPlatformFontList* PlatformFontList() {
 214     // If there is a font-list initialization thread, we need to let it run
 215     // to completion before the font list can be used for anything else.
 216     if (sInitFontListThread) {
 217       // If we're currently on the initialization thread, just continue;
 218       // otherwise wait for it to finish.
 219       if (IsInitFontListThread()) {
 220         return sPlatformFontList;
 221       }
 222       PR_JoinThread(sInitFontListThread);
 223       sInitFontListThread = nullptr;
 224       // If font-list initialization failed, the thread will have cleared
 225       // the static sPlatformFontList pointer; we cannot proceed without any
 226       // usable fonts.
 227       if (!sPlatformFontList) {
 228         MOZ_CRASH("Could not initialize gfxPlatformFontList");
 229       }
 230     }
 231     if (!sPlatformFontList->IsInitialized()) {
 232       if (!sPlatformFontList->InitFontList()) {
 233         MOZ_CRASH("Could not initialize gfxPlatformFontList");
 234       }
 235     }
 236     return sPlatformFontList;
 237   }
 238
 239   static bool Initialize(gfxPlatformFontList* aList);
 240
 241   static void Shutdown() {
 242     delete sPlatformFontList;
 243     sPlatformFontList = nullptr;
 244   }
 245
 246   bool IsInitialized() const { return mFontlistInitCount; }
 247
 248   virtual ~gfxPlatformFontList();
 249
 250   // Initialize font lists; return true on success, false if something fails.
 251   bool InitFontList();
 252
 253   void FontListChanged();
 254
 255   /**
 256    * Gathers (from a platform's underlying font system) the information needed
 257    * to initialize a fontlist::Family with its Face members.
 258    */
 259   virtual void GetFacesInitDataForFamily(
 260       const mozilla::fontlist::Family* aFamily,
 261       nsTArray<mozilla::fontlist::Face::InitData>& aFaces,
 262       bool aLoadCmaps) const {}
 263
 264   virtual void GetFontList(nsAtom* aLangGroup, const nsACString& aGenericFamily,
 265                            nsTArray<nsString>& aListOfFonts);
 266
 267   // Pass false to notify content that the shared font list has been modified
 268   // but not completely invalidated.
 269   void UpdateFontList(bool aFullRebuild = true);
 270
 271   void ClearLangGroupPrefFonts() {
 272     AutoLock lock(mLock);
 273     ClearLangGroupPrefFontsLocked();
 274   }
 275   virtual void ClearLangGroupPrefFontsLocked() MOZ_REQUIRES(mLock);
 276
 277   void GetFontFamilyList(nsTArray<RefPtr<gfxFontFamily>>& aFamilyArray);
 278
 279   already_AddRefed<gfxFont> SystemFindFontForChar(
 280       nsPresContext* aPresContext, uint32_t aCh, uint32_t aNextCh,
 281       Script aRunScript, eFontPresentation aPresentation,
 282       const gfxFontStyle* aStyle, FontVisibility* aVisibility);
 283
 284   // Flags to control optional behaviors in FindAndAddFamilies. The sense
 285   // of the bit flags have been chosen such that the default parameter of
 286   // FindFamiliesFlags(0) in FindFamily will give the most commonly-desired
 287   // behavior, and only a few callsites need to explicitly pass other values.
 288   enum class FindFamiliesFlags {
 289     // If set, "other" (e.g. localized) family names should be loaded
 290     // immediately; if clear, InitOtherFamilyNames is allowed to defer
 291     // loading to avoid blocking.
 292     eForceOtherFamilyNamesLoading = 1 << 0,
 293
 294     // If set, FindAndAddFamilies should not check for legacy "styled
 295     // family" names to add to the font list. This is used to avoid
 296     // a recursive search when using FindFamily to find a potential base
 297     // family name for a styled variant.
 298     eNoSearchForLegacyFamilyNames = 1 << 1,
 299
 300     // If set, FindAndAddFamilies will not add a missing entry to
 301     // mOtherNamesMissed
 302     eNoAddToNamesMissedWhenSearching = 1 << 2,
 303
 304     // If set, the family name was quoted and so must not be treated as a CSS
 305     // generic.
 306     eQuotedFamilyName = 1 << 3,
 307
 308     // If set, "hidden" font families (like ".SF NS Text" on macOS) are
 309     // searched in addition to standard user-visible families.
 310     eSearchHiddenFamilies = 1 << 4,
 311   };
 312
 313   // Find family(ies) matching aFamily and append to the aOutput array
 314   // (there may be multiple results in the case of fontconfig aliases, etc).
 315   // Return true if any match was found and appended, false if none.
 316   bool FindAndAddFamilies(
 317       nsPresContext* aPresContext, mozilla::StyleGenericFontFamily aGeneric,
 318       const nsACString& aFamily, nsTArray<FamilyAndGeneric>* aOutput,
 319       FindFamiliesFlags aFlags, gfxFontStyle* aStyle = nullptr,
 320       nsAtom* aLanguage = nullptr, gfxFloat aDevToCssSize = 1.0) {
 321     AutoLock lock(mLock);
 322     return FindAndAddFamiliesLocked(aPresContext, aGeneric, aFamily, aOutput,
 323                                     aFlags, aStyle, aLanguage, aDevToCssSize);
 324   }
 325   virtual bool FindAndAddFamiliesLocked(
 326       nsPresContext* aPresContext, mozilla::StyleGenericFontFamily aGeneric,
 327       const nsACString& aFamily, nsTArray<FamilyAndGeneric>* aOutput,
 328       FindFamiliesFlags aFlags, gfxFontStyle* aStyle = nullptr,
 329       nsAtom* aLanguage = nullptr, gfxFloat aDevToCssSize = 1.0)
 330       MOZ_REQUIRES(mLock);
 331
 332   gfxFontEntry* FindFontForFamily(nsPresContext* aPresContext,
 333                                   const nsACString& aFamily,
 334                                   const gfxFontStyle* aStyle);
 335
 336   mozilla::fontlist::FontList* SharedFontList() const {
 337     return mSharedFontList.get();
 338   }
 339
 340   // Create a handle for a single shmem block (identified by index) ready to
 341   // be shared to the given processId.
 342   void ShareFontListShmBlockToProcess(uint32_t aGeneration, uint32_t aIndex,
 343                                       base::ProcessId aPid,
 344                                       base::SharedMemoryHandle* aOut);
 345
 346   // Populate the array aBlocks with the complete list of shmem handles ready
 347   // to be shared to the given processId.
 348   void ShareFontListToProcess(nsTArray<base::SharedMemoryHandle>* aBlocks,
 349                               base::ProcessId aPid);
 350
 351   void ShmBlockAdded(uint32_t aGeneration, uint32_t aIndex,
 352                      base::SharedMemoryHandle aHandle);
 353
 354   base::SharedMemoryHandle ShareShmBlockToProcess(uint32_t aIndex,
 355                                                   base::ProcessId aPid);
 356
 357   void SetCharacterMap(uint32_t aGeneration,
 358                        const mozilla::fontlist::Pointer& aFacePtr,
 359                        const gfxSparseBitSet& aMap);
 360
 361   void SetupFamilyCharMap(uint32_t aGeneration,
 362                           const mozilla::fontlist::Pointer& aFamilyPtr);
 363
 364   // Start the async cmap loading process, if not already under way, from the
 365   // given family index. (For use in any process that needs font lookups.)
 366   void StartCmapLoadingFromFamily(uint32_t aStartIndex);
 367
 368   // [Parent] Handle request from content process to start cmap loading.
 369   void StartCmapLoading(uint32_t aGeneration, uint32_t aStartIndex);
 370
 371   void CancelLoadCmapsTask() {
 372     if (mLoadCmapsRunnable) {
 373       mLoadCmapsRunnable->Cancel();
 374       mLoadCmapsRunnable = nullptr;
 375     }
 376   }
 377
 378   // Populate aFamily with face records, and if aLoadCmaps is true, also load
 379   // their character maps (rather than leaving this to be done lazily).
 380   // Note that even when aFamily->IsInitialized() is true, it can make sense
 381   // to call InitializeFamily again if passing aLoadCmaps=true, in order to
 382   // ensure cmaps are loaded.
 383   [[nodiscard]] bool InitializeFamily(mozilla::fontlist::Family* aFamily,
 384                                       bool aLoadCmaps = false);
 385   void InitializeFamily(uint32_t aGeneration, uint32_t aFamilyIndex,
 386                         bool aLoadCmaps);
 387
 388   // name lookup table methods
 389
 390   void AddOtherFamilyNames(gfxFontFamily* aFamilyEntry,
 391                            const nsTArray<nsCString>& aOtherFamilyNames);
 392
 393   void AddFullname(gfxFontEntry* aFontEntry, const nsCString& aFullname) {
 394     AutoLock lock(mLock);
 395     AddFullnameLocked(aFontEntry, aFullname);
 396   }
 397   void AddFullnameLocked(gfxFontEntry* aFontEntry, const nsCString& aFullname)
 398       MOZ_REQUIRES(mLock);
 399
 400   void AddPostscriptName(gfxFontEntry* aFontEntry,
 401                          const nsCString& aPostscriptName) {
 402     AutoLock lock(mLock);
 403     AddPostscriptNameLocked(aFontEntry, aPostscriptName);
 404   }
 405   void AddPostscriptNameLocked(gfxFontEntry* aFontEntry,
 406                                const nsCString& aPostscriptName)
 407       MOZ_REQUIRES(mLock);
 408
 409   bool NeedFullnamePostscriptNames() { return mExtraNames != nullptr; }
 410
 411   /**
 412    * Read PSName and FullName of the given face, for src:local lookup,
 413    * returning true if actually implemented and succeeded.
 414    */
 415   virtual bool ReadFaceNames(mozilla::fontlist::Family* aFamily,
 416                              mozilla::fontlist::Face* aFace, nsCString& aPSName,
 417                              nsCString& aFullName) {
 418     return false;
 419   }
 420
 421   // initialize localized family names
 422   bool InitOtherFamilyNames(bool aDeferOtherFamilyNamesLoading);
 423   bool InitOtherFamilyNames(uint32_t aGeneration, bool aDefer);
 424
 425   // pure virtual functions, to be provided by concrete subclasses
 426
 427   // get the system default font family
 428   FontFamily GetDefaultFont(nsPresContext* aPresContext,
 429                             const gfxFontStyle* aStyle);
 430   FontFamily GetDefaultFontLocked(nsPresContext* aPresContext,
 431                                   const gfxFontStyle* aStyle)
 432       MOZ_REQUIRES(mLock);
 433
 434   // get the "ultimate" default font, for use if the font list is otherwise
 435   // unusable (e.g. in the middle of being updated)
 436   gfxFontEntry* GetDefaultFontEntry() {
 437     AutoLock lock(mLock);
 438     return mDefaultFontEntry.get();
 439   }
 440
 441   /**
 442    * Look up a font by name on the host platform.
 443    *
 444    * Note that the style attributes (weight, stretch, style) are NOT used in
 445    * selecting the platform font, which is looked up by name only; these are
 446    * values to be recorded in the new font entry.
 447    */
 448   virtual gfxFontEntry* LookupLocalFont(nsPresContext* aPresContext,
 449                                         const nsACString& aFontName,
 450                                         WeightRange aWeightForEntry,
 451                                         StretchRange aStretchForEntry,
 452                                         SlantStyleRange aStyleForEntry) = 0;
 453
 454   /**
 455    * Create a new platform font from downloaded data (@font-face).
 456    *
 457    * Note that the style attributes (weight, stretch, style) are NOT related
 458    * (necessarily) to any values within the font resource itself; these are
 459    * values to be recorded in the new font entry and used for face selection,
 460    * in place of whatever inherent style attributes the resource may have.
 461    *
 462    * This method takes ownership of the data block passed in as aFontData,
 463    * and must ensure it is free()'d when no longer required.
 464    */
 465   virtual gfxFontEntry* MakePlatformFont(const nsACString& aFontName,
 466                                          WeightRange aWeightForEntry,
 467                                          StretchRange aStretchForEntry,
 468                                          SlantStyleRange aStyleForEntry,
 469                                          const uint8_t* aFontData,
 470                                          uint32_t aLength) = 0;
 471
 472   // get the standard family name on the platform for a given font name
 473   // (platforms may override, eg Mac)
 474   virtual bool GetStandardFamilyName(const nsCString& aFontName,
 475                                      nsACString& aFamilyName);
 476
 477   // Get the localized family name for a given font family.
 478   bool GetLocalizedFamilyName(const FontFamily& aFamily,
 479                               nsACString& aFamilyName);
 480
 481   // get the default font name which is available on the system from
 482   // font.name-list.*.  if there are no available fonts in the pref,
 483   // returns an empty FamilyAndGeneric record.
 484   FamilyAndGeneric GetDefaultFontFamily(const nsACString& aLangGroup,
 485                                         const nsACString& aGenericFamily);
 486
 487   virtual void AddSizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf,
 488                                       FontListSizes* aSizes) const;
 489   virtual void AddSizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf,
 490                                       FontListSizes* aSizes) const;
 491
 492   mozilla::fontlist::Pointer GetShmemCharMap(const gfxSparseBitSet* aCmap) {
 493     AutoLock lock(mLock);
 494     return GetShmemCharMapLocked(aCmap);
 495   }
 496   mozilla::fontlist::Pointer GetShmemCharMapLocked(const gfxSparseBitSet* aCmap)
 497       MOZ_REQUIRES(mLock);
 498
 499   // Search for existing cmap that matches the input; return the input if no
 500   // match is found.
 501   already_AddRefed<gfxCharacterMap> FindCharMap(gfxCharacterMap* aCmap);
 502
 503   // Remove the cmap from the shared cmap set.
 504   void RemoveCmap(const gfxCharacterMap* aCharMap);
 505
 506   // Keep track of userfont sets to notify when global fontlist changes occur.
 507   void AddUserFontSet(gfxUserFontSet* aUserFontSet) {
 508     AutoLock lock(mLock);
 509     mUserFontSetList.Insert(aUserFontSet);
 510   }
 511
 512   void RemoveUserFontSet(gfxUserFontSet* aUserFontSet) {
 513     AutoLock lock(mLock);
 514     mUserFontSetList.Remove(aUserFontSet);
 515   }
 516
 517   static const gfxFontEntry::ScriptRange sComplexScriptRanges[];
 518
 519   void GetFontlistInitInfo(uint32_t& aNumInits, uint32_t& aLoaderState) {
 520     aNumInits = mFontlistInitCount;
 521     aLoaderState = (uint32_t)mState;
 522   }
 523
 524   virtual void AddGenericFonts(nsPresContext* aPresContext,
 525                                mozilla::StyleGenericFontFamily aGenericType,
 526                                nsAtom* aLanguage,
 527                                nsTArray<FamilyAndGeneric>& aFamilyList);
 528
 529   /**
 530    * Given a Face from the shared font list, return a gfxFontEntry usable
 531    * by the current process. This returns a cached entry if available,
 532    * otherwise it calls the (platform-specific) CreateFontEntry method to
 533    * make one, and adds it to the cache.
 534    */
 535   gfxFontEntry* GetOrCreateFontEntry(mozilla::fontlist::Face* aFace,
 536                                      const mozilla::fontlist::Family* aFamily) {
 537     AutoLock lock(mLock);
 538     return GetOrCreateFontEntryLocked(aFace, aFamily);
 539   }
 540   gfxFontEntry* GetOrCreateFontEntryLocked(
 541       mozilla::fontlist::Face* aFace, const mozilla::fontlist::Family* aFamily)
 542       MOZ_REQUIRES(mLock);
 543
 544   const FontPrefs* GetFontPrefs() const MOZ_REQUIRES(mLock) {
 545     return mFontPrefs.get();
 546   }
 547
 548   bool EmojiPrefHasUserValue() const {
 549     AutoLock lock(mLock);
 550     return mFontPrefs->EmojiHasUserValue();
 551   }
 552
 553   PrefFontList* GetPrefFontsLangGroup(
 554       nsPresContext* aPresContext, mozilla::StyleGenericFontFamily aGenericType,
 555       eFontPrefLang aPrefLang) {
 556     AutoLock lock(mLock);
 557     return GetPrefFontsLangGroupLocked(aPresContext, aGenericType, aPrefLang);
 558   }
 559   PrefFontList* GetPrefFontsLangGroupLocked(
 560       nsPresContext* aPresContext, mozilla::StyleGenericFontFamily aGenericType,
 561       eFontPrefLang aPrefLang) MOZ_REQUIRES(mLock);
 562
 563   // in some situations, need to make decisions about ambiguous characters, may
 564   // need to look at multiple pref langs
 565   void GetLangPrefs(eFontPrefLang aPrefLangs[], uint32_t& aLen,
 566                     eFontPrefLang aCharLang, eFontPrefLang aPageLang);
 567
 568   // convert a lang group to enum constant (i.e. "zh-TW" ==>
 569   // eFontPrefLang_ChineseTW)
 570   static eFontPrefLang GetFontPrefLangFor(const char* aLang);
 571
 572   // convert a lang group atom to enum constant
 573   static eFontPrefLang GetFontPrefLangFor(nsAtom* aLang);
 574
 575   // convert an enum constant to a lang group atom
 576   static nsAtom* GetLangGroupForPrefLang(eFontPrefLang aLang);
 577
 578   // convert a enum constant to lang group string (i.e. eFontPrefLang_ChineseTW
 579   // ==> "zh-TW")
 580   static const char* GetPrefLangName(eFontPrefLang aLang);
 581
 582   // map a char code to a font language for Preferences
 583   static eFontPrefLang GetFontPrefLangFor(uint32_t aCh);
 584
 585   // returns true if a pref lang is CJK
 586   static bool IsLangCJK(eFontPrefLang aLang);
 587
 588   // helper method to add a pref lang to an array, if not already in array
 589   static void AppendPrefLang(eFontPrefLang aPrefLangs[], uint32_t& aLen,
 590                              eFontPrefLang aAddLang);
 591
 592   // default serif/sans-serif choice based on font.default.xxx prefs
 593   mozilla::StyleGenericFontFamily GetDefaultGeneric(eFontPrefLang aLang);
 594
 595   // Returns true if the font family whitelist is not empty. In this case we
 596   // ignore the "CSS visibility level"; only the given fonts are present in
 597   // the browser's font list.
 598   bool IsFontFamilyWhitelistActive() const {
 599     return mFontFamilyWhitelistActive;
 600   };
 601
 602   static void FontWhitelistPrefChanged(const char* aPref, void* aClosure);
 603
 604   bool AddWithLegacyFamilyName(const nsACString& aLegacyName,
 605                                gfxFontEntry* aFontEntry,
 606                                FontVisibility aVisibility);
 607
 608   static const char* GetGenericName(
 609       mozilla::StyleGenericFontFamily aGenericType);
 610
 611   bool SkipFontFallbackForChar(FontVisibility aVisibility, uint32_t aCh) const {
 612     AutoLock lock(mLock);
 613     return mCodepointsWithNoFonts[aVisibility].test(aCh);
 614   }
 615
 616   // Return whether the given font-family record should be visible to CSS,
 617   // in a context with the given FontVisibility setting.
 618   bool IsVisibleToCSS(const gfxFontFamily& aFamily,
 619                       FontVisibility aVisibility) const;
 620   bool IsVisibleToCSS(const mozilla::fontlist::Family& aFamily,
 621                       FontVisibility aVisibility) const;
 622
 623   // (Re-)initialize the set of codepoints that we know cannot be rendered.
 624   void InitializeCodepointsWithNoFonts() MOZ_REQUIRES(mLock);
 625
 626   // If using the shared font list, returns a generation count that is
 627   // incremented if/when the platform list is reinitialized (e.g. because
 628   // fonts are installed/removed while the browser is running), such that
 629   // existing references to shared font family or face objects and character
 630   // maps will no longer be valid.
 631   // (The legacy (non-shared) list just returns 0 here.)
 632   uint32_t GetGeneration() const;
 633
 634   // Sometimes we need to know if we're on the InitFontList startup thread.
 635   static bool IsInitFontListThread() {
 636     return PR_GetCurrentThread() == sInitFontListThread;
 637   }
 638
 639   bool IsKnownIconFontFamily(const nsAtom* aFamilyName) const;
 640   void LoadIconFontOverrideList();
 641
 642   void Lock() MOZ_CAPABILITY_ACQUIRE(mLock) { mLock.Lock(); }
 643   void Unlock() MOZ_CAPABILITY_RELEASE(mLock) { mLock.Unlock(); }
 644
 645   // This is only public because some external callers want to be able to
 646   // assert about the locked status.
 647   mutable mozilla::RecursiveMutex mLock;
 648
 649  protected:
 650   friend class mozilla::fontlist::FontList;
 651   friend class InitOtherFamilyNamesForStylo;
 652
 653   template <size_t N>
 654   static bool FamilyInList(const nsACString& aName, const char* (&aList)[N]) {
 655     return FamilyInList(aName, aList, N);
 656   }
 657   static bool FamilyInList(const nsACString& aName, const char* aList[],
 658                            size_t aCount);
 659
 660   // Check list is correctly sorted (in debug build only; no-op on release).
 661   template <size_t N>
 662   static void CheckFamilyList(const char* (&aList)[N]) {
 663     CheckFamilyList(aList, N);
 664   }
 665   static void CheckFamilyList(const char* aList[], size_t aCount);
 666
 667   class InitOtherFamilyNamesRunnable : public mozilla::CancelableRunnable {
 668    public:
 669     InitOtherFamilyNamesRunnable()
 670         : CancelableRunnable(
 671               "gfxPlatformFontList::InitOtherFamilyNamesRunnable"),
 672           mIsCanceled(false) {}
 673
 674     NS_IMETHOD Run() override {
 675       if (mIsCanceled) {
 676         return NS_OK;
 677       }
 678
 679       gfxPlatformFontList* fontList = gfxPlatformFontList::PlatformFontList();
 680       if (!fontList) {
 681         return NS_OK;
 682       }
 683
 684       fontList->InitOtherFamilyNamesInternal(true);
 685
 686       return NS_OK;
 687     }
 688
 689     nsresult Cancel() override {
 690       mIsCanceled = true;
 691
 692       return NS_OK;
 693     }
 694
 695    private:
 696     bool mIsCanceled;
 697   };
 698
 699   class MemoryReporter final : public nsIMemoryReporter {
 700     ~MemoryReporter() = default;
 701
 702    public:
 703     NS_DECL_ISUPPORTS
 704     NS_DECL_NSIMEMORYREPORTER
 705   };
 706
 707   class PrefName final : public nsAutoCString {
 708     void Init(const nsACString& aGeneric, const nsACString& aLangGroup) {
 709       Assign(aGeneric);
 710       if (!aLangGroup.IsEmpty()) {
 711         Append('.');
 712         Append(aLangGroup);
 713       }
 714     }
 715
 716    public:
 717     PrefName(const nsACString& aGeneric, const nsACString& aLangGroup) {
 718       Init(aGeneric, aLangGroup);
 719     }
 720
 721     PrefName(const char* aGeneric, const char* aLangGroup) {
 722       Init(nsDependentCString(aGeneric), nsDependentCString(aLangGroup));
 723     }
 724
 725     PrefName(const char* aGeneric, nsAtom* aLangGroup) {
 726       if (aLangGroup) {
 727         Init(nsDependentCString(aGeneric), nsAtomCString(aLangGroup));
 728       } else {
 729         Init(nsDependentCString(aGeneric), nsAutoCString());
 730       }
 731     }
 732   };
 733
 734   explicit gfxPlatformFontList(bool aNeedFullnamePostscriptNames = true);
 735
 736   static gfxPlatformFontList* sPlatformFontList;
 737
 738   /**
 739    * Convenience method to return the first matching family (if any) as found
 740    * by FindAndAddFamilies(). The family will be initialized (synchronously)
 741    * if this has not already been done, so the returned pointer, if non-null,
 742    * is ready for use.
 743    */
 744   mozilla::fontlist::Family* FindSharedFamily(
 745       nsPresContext* aPresContext, const nsACString& aFamily,
 746       FindFamiliesFlags aFlags = FindFamiliesFlags(0),
 747       gfxFontStyle* aStyle = nullptr, nsAtom* aLanguage = nullptr,
 748       gfxFloat aDevToCssSize = 1.0) MOZ_REQUIRES(mLock);
 749
 750   gfxFontFamily* FindUnsharedFamily(
 751       nsPresContext* aPresContext, const nsACString& aFamily,
 752       FindFamiliesFlags aFlags = FindFamiliesFlags(0),
 753       gfxFontStyle* aStyle = nullptr, nsAtom* aLanguage = nullptr,
 754       gfxFloat aDevToCssSize = 1.0) MOZ_REQUIRES(mLock) {
 755     if (SharedFontList()) {
 756       return nullptr;
 757     }
 758     AutoTArray<FamilyAndGeneric, 1> families;
 759     if (FindAndAddFamiliesLocked(
 760             aPresContext, mozilla::StyleGenericFontFamily::None, aFamily,
 761             &families, aFlags, aStyle, aLanguage, aDevToCssSize)) {
 762       return families[0].mFamily.mUnshared;
 763     }
 764     return nullptr;
 765   }
 766
 767   FontFamily FindFamily(nsPresContext* aPresContext, const nsACString& aFamily,
 768                         FindFamiliesFlags aFlags = FindFamiliesFlags(0),
 769                         gfxFontStyle* aStyle = nullptr,
 770                         nsAtom* aLanguage = nullptr,
 771                         gfxFloat aDevToCssSize = 1.0) MOZ_REQUIRES(mLock) {
 772     if (SharedFontList()) {
 773       return FontFamily(FindSharedFamily(aPresContext, aFamily, aFlags, aStyle,
 774                                          aLanguage, aDevToCssSize));
 775     }
 776     return FontFamily(FindUnsharedFamily(aPresContext, aFamily, aFlags, aStyle,
 777                                          aLanguage, aDevToCssSize));
 778   }
 779
 780   // Lookup family name in global family list without substitutions or
 781   // localized family name lookup. Used for common font fallback families.
 782   gfxFontFamily* FindFamilyByCanonicalName(const nsACString& aFamily)
 783       MOZ_REQUIRES(mLock) {
 784     nsAutoCString key;
 785     gfxFontFamily* familyEntry;
 786     GenerateFontListKey(aFamily, key);
 787     if ((familyEntry = mFontFamilies.GetWeak(key))) {
 788       return CheckFamily(familyEntry);
 789     }
 790     return nullptr;
 791   }
 792
 793   // returns default font for a given character, null otherwise
 794   already_AddRefed<gfxFont> CommonFontFallback(nsPresContext* aPresContext,
 795                                                uint32_t aCh, uint32_t aNextCh,
 796                                                Script aRunScript,
 797                                                eFontPresentation aPresentation,
 798                                                const gfxFontStyle* aMatchStyle,
 799                                                FontFamily& aMatchedFamily)
 800       MOZ_REQUIRES(mLock);
 801
 802   // Search fonts system-wide for a given character, null if not found.
 803   already_AddRefed<gfxFont> GlobalFontFallback(
 804       nsPresContext* aPresContext, uint32_t aCh, uint32_t aNextCh,
 805       Script aRunScript, eFontPresentation aPresentation,
 806       const gfxFontStyle* aMatchStyle, uint32_t& aCmapCount,
 807       FontFamily& aMatchedFamily) MOZ_REQUIRES(mLock);
 808
 809   // Platform-specific implementation of global font fallback, if any;
 810   // this may return nullptr in which case the default cmap-based fallback
 811   // will be performed.
 812   virtual gfxFontEntry* PlatformGlobalFontFallback(
 813       nsPresContext* aPresContext, const uint32_t aCh, Script aRunScript,
 814       const gfxFontStyle* aMatchStyle, FontFamily& aMatchedFamily) {
 815     return nullptr;
 816   }
 817
 818   // whether system-based font fallback is used or not
 819   // if system fallback is used, no need to load all cmaps
 820   virtual bool UsesSystemFallback() { return false; }
 821
 822   void AppendCJKPrefLangs(eFontPrefLang aPrefLangs[], uint32_t& aLen,
 823                           eFontPrefLang aCharLang, eFontPrefLang aPageLang)
 824       MOZ_REQUIRES(mLock);
 825
 826   // verifies that a family contains a non-zero font count
 827   gfxFontFamily* CheckFamily(gfxFontFamily* aFamily) MOZ_REQUIRES(mLock);
 828
 829   // initialize localized family names
 830   void InitOtherFamilyNamesInternal(bool aDeferOtherFamilyNamesLoading);
 831   void CancelInitOtherFamilyNamesTask();
 832
 833   void AddToMissedNames(const nsCString& aKey) MOZ_REQUIRES(mLock);
 834
 835   // search through font families, looking for a given name, initializing
 836   // facename lists along the way. first checks all families with names
 837   // close to face name, then searchs all families if not found.
 838   gfxFontEntry* SearchFamiliesForFaceName(const nsACString& aFaceName)
 839       MOZ_REQUIRES(mLock);
 840
 841   // helper method for finding fullname/postscript names in facename lists
 842   gfxFontEntry* FindFaceName(const nsACString& aFaceName) MOZ_REQUIRES(mLock);
 843
 844   // look up a font by name, for cases where platform font list
 845   // maintains explicit mappings of fullname/psname ==> font
 846   virtual gfxFontEntry* LookupInFaceNameLists(const nsACString& aFaceName)
 847       MOZ_REQUIRES(mLock);
 848
 849   gfxFontEntry* LookupInSharedFaceNameList(nsPresContext* aPresContext,
 850                                            const nsACString& aFaceName,
 851                                            WeightRange aWeightForEntry,
 852                                            StretchRange aStretchForEntry,
 853                                            SlantStyleRange aStyleForEntry)
 854       MOZ_REQUIRES(mLock);
 855
 856   // load the bad underline blocklist from pref.
 857   void LoadBadUnderlineList();
 858
 859   void GenerateFontListKey(const nsACString& aKeyName, nsACString& aResult);
 860
 861   virtual void GetFontFamilyNames(nsTArray<nsCString>& aFontFamilyNames)
 862       MOZ_REQUIRES(mLock);
 863
 864   // helper function to map lang to lang group
 865   nsAtom* GetLangGroup(nsAtom* aLanguage);
 866
 867   // gfxFontInfoLoader overrides, used to load in font cmaps
 868   void InitLoader() MOZ_REQUIRES(mLock) override;
 869   bool LoadFontInfo() override;
 870   void CleanupLoader() override;
 871
 872   void ForceGlobalReflowLocked(
 873       gfxPlatform::NeedsReframe aNeedsReframe,
 874       gfxPlatform::BroadcastToChildren aBroadcastToChildren =
 875           gfxPlatform::BroadcastToChildren::Yes) MOZ_REQUIRES(mLock);
 876
 877   // read the loader initialization prefs, and start it
 878   void GetPrefsAndStartLoader();
 879
 880   // If aForgetLocalFaces is true, all gfxFontEntries for src:local fonts must
 881   // be discarded (not potentially reused to satisfy the rebuilt rules),
 882   // because they may no longer be valid.
 883   void RebuildLocalFonts(bool aForgetLocalFaces = false) MOZ_REQUIRES(mLock);
 884
 885   void ResolveGenericFontNames(nsPresContext* aPresContext,
 886                                mozilla::StyleGenericFontFamily aGenericType,
 887                                eFontPrefLang aPrefLang,
 888                                PrefFontList* aGenericFamilies)
 889       MOZ_REQUIRES(mLock);
 890
 891   void ResolveEmojiFontNames(nsPresContext* aPresContext,
 892                              PrefFontList* aGenericFamilies)
 893       MOZ_REQUIRES(mLock);
 894
 895   void GetFontFamiliesFromGenericFamilies(
 896       nsPresContext* aPresContext, mozilla::StyleGenericFontFamily aGenericType,
 897       nsTArray<nsCString>& aGenericNameFamilies, nsAtom* aLangGroup,
 898       PrefFontList* aFontFamilies) MOZ_REQUIRES(mLock);
 899
 900   virtual nsresult InitFontListForPlatform() MOZ_REQUIRES(mLock) = 0;
 901   virtual void InitSharedFontListForPlatform() MOZ_REQUIRES(mLock) {}
 902
 903   virtual gfxFontEntry* CreateFontEntry(
 904       mozilla::fontlist::Face* aFace,
 905       const mozilla::fontlist::Family* aFamily) {
 906     return nullptr;
 907   }
 908
 909   /**
 910    * Methods to apply the font.system.whitelist anti-fingerprinting pref,
 911    * by filtering the list of installed fonts so that only whitelisted families
 912    * are exposed.
 913    * There are separate implementations of this for the per-process font list
 914    * and for the shared-memory font list.
 915    */
 916   void ApplyWhitelist() MOZ_REQUIRES(mLock);
 917   void ApplyWhitelist(nsTArray<mozilla::fontlist::Family::InitData>& aFamilies);
 918
 919   // Create a new gfxFontFamily of the appropriate subclass for the platform,
 920   // used when AddWithLegacyFamilyName needs to create a new family.
 921   virtual gfxFontFamily* CreateFontFamily(const nsACString& aName,
 922                                           FontVisibility aVisibility) const = 0;
 923
 924   /**
 925    * For the post-startup font info loader task.
 926    * Perform platform-specific work to read alternate names (if any) for a
 927    * font family, recording them in mAliasTable. Once alternate names have been
 928    * loaded for all families, the accumulated records are stored in the shared
 929    * font list's mAliases list.
 930    * Some platforms (currently Linux/fontconfig) may load alternate names as
 931    * part of initially populating the font list with family records, in which
 932    * case this method is unused.
 933    */
 934   virtual void ReadFaceNamesForFamily(mozilla::fontlist::Family* aFamily,
 935                                       bool aNeedFullnamePostscriptNames)
 936       MOZ_REQUIRES(mLock) {}
 937
 938   typedef nsRefPtrHashtable<nsCStringHashKey, gfxFontFamily> FontFamilyTable;
 939   typedef nsRefPtrHashtable<nsCStringHashKey, gfxFontEntry> FontEntryTable;
 940
 941   // used by memory reporter to accumulate sizes of family names in the table
 942   static size_t SizeOfFontFamilyTableExcludingThis(
 943       const FontFamilyTable& aTable, mozilla::MallocSizeOf aMallocSizeOf);
 944   static size_t SizeOfFontEntryTableExcludingThis(
 945       const FontEntryTable& aTable, mozilla::MallocSizeOf aMallocSizeOf);
 946
 947   // Platform-specific helper for GetDefaultFont(...).
 948   virtual FontFamily GetDefaultFontForPlatform(nsPresContext* aPresContext,
 949                                                const gfxFontStyle* aStyle,
 950                                                nsAtom* aLanguage = nullptr)
 951       MOZ_REQUIRES(mLock) = 0;
 952
 953   // canonical family name ==> family entry (unique, one name per family entry)
 954   FontFamilyTable mFontFamilies MOZ_GUARDED_BY(mLock);
 955
 956   // other family name ==> family entry (not unique, can have multiple names per
 957   // family entry, only names *other* than the canonical names are stored here)
 958   FontFamilyTable mOtherFamilyNames MOZ_GUARDED_BY(mLock);
 959
 960   // flag set after InitOtherFamilyNames is called upon first name lookup miss
 961   mozilla::Atomic<bool> mOtherFamilyNamesInitialized;
 962
 963   // The pending InitOtherFamilyNames() task.
 964   RefPtr<mozilla::CancelableRunnable> mPendingOtherFamilyNameTask;
 965
 966   // flag set after fullname and Postcript name lists are populated
 967   mozilla::Atomic<bool> mFaceNameListsInitialized;
 968
 969   struct ExtraNames {
 970     ExtraNames() = default;
 971
 972     // fullname ==> font entry (unique, one name per font entry)
 973     FontEntryTable mFullnames{64};
 974     // Postscript name ==> font entry (unique, one name per font entry)
 975     FontEntryTable mPostscriptNames{64};
 976   };
 977   // The lock is needed to guard access to the actual name tables, but does not
 978   // need to be held to just test whether mExtraNames is non-null as it is set
 979   // during initialization before other threads have a chance to see it.
 980   mozilla::UniquePtr<ExtraNames> mExtraNames MOZ_PT_GUARDED_BY(mLock);
 981
 982   // face names missed when face name loading takes a long time
 983   mozilla::UniquePtr<nsTHashSet<nsCString>> mFaceNamesMissed
 984       MOZ_GUARDED_BY(mLock);
 985
 986   // localized family names missed when face name loading takes a long time
 987   mozilla::UniquePtr<nsTHashSet<nsCString>> mOtherNamesMissed
 988       MOZ_GUARDED_BY(mLock);
 989
 990   typedef mozilla::RangedArray<mozilla::UniquePtr<PrefFontList>,
 991                                size_t(mozilla::StyleGenericFontFamily::None),
 992                                size_t(
 993                                    mozilla::StyleGenericFontFamily::MozEmoji)>
 994       PrefFontsForLangGroup;
 995   mozilla::RangedArray<PrefFontsForLangGroup, eFontPrefLang_First,
 996                        eFontPrefLang_Count>
 997       mLangGroupPrefFonts MOZ_GUARDED_BY(mLock);
 998   mozilla::UniquePtr<PrefFontList> mEmojiPrefFont MOZ_GUARDED_BY(mLock);
 999
1000   // When system-wide font lookup fails for a character, cache it to skip future
1001   // searches. This is an array of bitsets, one for each FontVisibility level.
1002   mozilla::EnumeratedArray<FontVisibility, FontVisibility::Count,
1003                            gfxSparseBitSet>
1004       mCodepointsWithNoFonts MOZ_GUARDED_BY(mLock);
1005
1006   // the family to use for U+FFFD fallback, to avoid expensive search every time
1007   // on pages with lots of problems
1008   mozilla::EnumeratedArray<FontVisibility, FontVisibility::Count, FontFamily>
1009       mReplacementCharFallbackFamily MOZ_GUARDED_BY(mLock);
1010
1011   // Sorted array of lowercased family names; use ContainsSorted to test
1012   nsTArray<nsCString> mBadUnderlineFamilyNames;
1013
1014   // character map data shared across families
1015   // contains weak ptrs to cmaps shared by font entry objects
1016   nsTHashtable<CharMapHashKey> mSharedCmaps MOZ_GUARDED_BY(mLock);
1017
1018   nsTHashtable<ShmemCharMapHashEntry> mShmemCharMaps MOZ_GUARDED_BY(mLock);
1019
1020   // data used as part of the font cmap loading process
1021   nsTArray<RefPtr<gfxFontFamily>> mFontFamiliesToLoad;
1022   uint32_t mStartIndex = 0;
1023   uint32_t mNumFamilies = 0;
1024
1025   // xxx - info for diagnosing no default font aborts
1026   // see bugs 636957, 1070983, 1189129
1027   uint32_t mFontlistInitCount = 0;  // num times InitFontList called
1028
1029   nsTHashSet<gfxUserFontSet*> mUserFontSetList MOZ_GUARDED_BY(mLock);
1030
1031   nsLanguageAtomService* mLangService = nullptr;
1032
1033   nsTArray<uint32_t> mCJKPrefLangs MOZ_GUARDED_BY(mLock);
1034   nsTArray<mozilla::StyleGenericFontFamily> mDefaultGenericsLangGroup
1035       MOZ_GUARDED_BY(mLock);
1036
1037   nsTArray<nsCString> mEnabledFontsList;
1038   nsTHashSet<nsCString> mIconFontsSet;
1039
1040   mozilla::UniquePtr<mozilla::fontlist::FontList> mSharedFontList;
1041
1042   nsClassHashtable<nsCStringHashKey, mozilla::fontlist::AliasData> mAliasTable;
1043   nsTHashMap<nsCStringHashKey, mozilla::fontlist::LocalFaceRec::InitData>
1044       mLocalNameTable;
1045
1046   nsRefPtrHashtable<nsPtrHashKey<mozilla::fontlist::Face>, gfxFontEntry>
1047       mFontEntries MOZ_GUARDED_BY(mLock);
1048
1049   mozilla::UniquePtr<FontPrefs> mFontPrefs;
1050
1051   RefPtr<gfxFontEntry> mDefaultFontEntry MOZ_GUARDED_BY(mLock);
1052
1053   RefPtr<mozilla::CancelableRunnable> mLoadCmapsRunnable;
1054   uint32_t mStartedLoadingCmapsFrom = 0xffffffffu;
1055
1056   bool mFontFamilyWhitelistActive = false;
1057
1058   static PRThread* sInitFontListThread;
1059 };
1060
1061 MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(gfxPlatformFontList::FindFamiliesFlags)
1062
1063 #endif /* GFXPLATFORMFONTLIST_H_ */