summaryrefslogtreecommitdiffstats
path: root/gfx/thebes/gfxFcPlatformFontList.h
blob: 54070d141051acb1a1a91ea001591383e6d7ebcb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef GFXFCPLATFORMFONTLIST_H_
#define GFXFCPLATFORMFONTLIST_H_

#include "gfxFT2FontBase.h"
#include "gfxPlatformFontList.h"
#include "mozilla/FontPropertyTypes.h"
#include "mozilla/mozalloc.h"
#include "mozilla/RefPtr.h"
#include "mozilla/UniquePtr.h"
#include "nsClassHashtable.h"
#include "nsTHashMap.h"

#include <fontconfig/fontconfig.h>
#include "ft2build.h"
#include FT_FREETYPE_H
#include FT_TRUETYPE_TABLES_H
#include FT_MULTIPLE_MASTERS_H

#if defined(MOZ_SANDBOX) && defined(XP_LINUX)
#  include "mozilla/SandboxBroker.h"
#endif

namespace mozilla {
namespace dom {
class SystemFontListEntry;
class SystemFontList;
class SystemFontOptions;
};  // namespace dom

template <>
class RefPtrTraits<FcPattern> {
 public:
  static void Release(FcPattern* ptr) { FcPatternDestroy(ptr); }
  static void AddRef(FcPattern* ptr) { FcPatternReference(ptr); }
};

template <>
class RefPtrTraits<FcConfig> {
 public:
  static void Release(FcConfig* ptr) { FcConfigDestroy(ptr); }
  static void AddRef(FcConfig* ptr) { FcConfigReference(ptr); }
};

template <>
class DefaultDelete<FcFontSet> {
 public:
  void operator()(FcFontSet* aPtr) { FcFontSetDestroy(aPtr); }
};

template <>
class DefaultDelete<FcObjectSet> {
 public:
  void operator()(FcObjectSet* aPtr) { FcObjectSetDestroy(aPtr); }
};

};  // namespace mozilla

// The names for the font entry and font classes should really
// the common 'Fc' abbreviation but the gfxPangoFontGroup code already
// defines versions of these, so use the verbose name for now.

class gfxFontconfigFontEntry final : public gfxFT2FontEntryBase {
  friend class gfxFcPlatformFontList;
  using FTUserFontData = mozilla::gfx::FTUserFontData;

 public:
  // used for system fonts with explicit patterns
  explicit gfxFontconfigFontEntry(const nsACString& aFaceName,
                                  FcPattern* aFontPattern,
                                  bool aIgnoreFcCharmap);

  // used for data fonts where the fontentry takes ownership
  // of the font data and the FT_Face
  explicit gfxFontconfigFontEntry(const nsACString& aFaceName,
                                  WeightRange aWeight, StretchRange aStretch,
                                  SlantStyleRange aStyle,
                                  RefPtr<mozilla::gfx::SharedFTFace>&& aFace);

  // used for @font-face local system fonts with explicit patterns
  explicit gfxFontconfigFontEntry(const nsACString& aFaceName,
                                  FcPattern* aFontPattern, WeightRange aWeight,
                                  StretchRange aStretch,
                                  SlantStyleRange aStyle);

  gfxFontEntry* Clone() const override;

  FcPattern* GetPattern() { return mFontPattern; }

  nsresult ReadCMAP(FontInfoData* aFontInfoData = nullptr) override;
  bool TestCharacterMap(uint32_t aCh) override;

  mozilla::gfx::SharedFTFace* GetFTFace();
  FTUserFontData* GetUserFontData();

  FT_MM_Var* GetMMVar() override;

  bool HasVariations() override;
  void GetVariationAxes(nsTArray<gfxFontVariationAxis>& aAxes) override;
  void GetVariationInstances(
      nsTArray<gfxFontVariationInstance>& aInstances) override;

  bool HasFontTable(uint32_t aTableTag) override;
  nsresult CopyFontTable(uint32_t aTableTag, nsTArray<uint8_t>&) override;
  hb_blob_t* GetFontTable(uint32_t aTableTag) override;

  double GetAspect(uint8_t aSizeAdjustBasis);

 protected:
  virtual ~gfxFontconfigFontEntry();

  gfxFont* CreateFontInstance(const gfxFontStyle* aFontStyle) override;

  void GetUserFontFeatures(FcPattern* aPattern);

  // pattern for a single face of a family
  RefPtr<FcPattern> mFontPattern;

  // FTFace - initialized when needed. Once mFTFaceInitialized is true,
  // the face can be accessed without locking.
  // Note that mFTFace owns a reference to the SharedFTFace, but is not
  // a RefPtr because we need it to be an atomic.
  mozilla::Atomic<mozilla::gfx::SharedFTFace*> mFTFace;
  mozilla::Atomic<bool> mFTFaceInitialized;

  // Whether TestCharacterMap should check the actual cmap rather than asking
  // fontconfig about character coverage.
  // We do this for app-bundled (rather than system) fonts, as they may
  // include color glyphs that fontconfig would overlook, and for fonts
  // loaded via @font-face.
  bool mIgnoreFcCharmap;

  // Whether the face supports variations. For system-installed fonts, we
  // query fontconfig for this (so they will only work if fontconfig is
  // recent enough to include support); for downloaded user-fonts we query
  // the FreeType face.
  enum class HasVariationsState : int8_t {
    Uninitialized = -1,
    No = 0,
    Yes = 1,
  };
  std::atomic<HasVariationsState> mHasVariations =
      HasVariationsState::Uninitialized;

  class UnscaledFontCache {
   public:
    already_AddRefed<mozilla::gfx::UnscaledFontFontconfig> Lookup(
        const std::string& aFile, uint32_t aIndex);

    void Add(
        const RefPtr<mozilla::gfx::UnscaledFontFontconfig>& aUnscaledFont) {
      mUnscaledFonts[kNumEntries - 1] = aUnscaledFont;
      MoveToFront(kNumEntries - 1);
    }

   private:
    void MoveToFront(size_t aIndex);

    static const size_t kNumEntries = 3;
    mozilla::ThreadSafeWeakPtr<mozilla::gfx::UnscaledFontFontconfig>
        mUnscaledFonts[kNumEntries];
  };

  UnscaledFontCache mUnscaledFontCache;

  // Because of FreeType bug 52955, we keep the FT_MM_Var struct when it is
  // first loaded, rather than releasing it and re-fetching it as needed.
  FT_MM_Var* mMMVar = nullptr;
  bool mMMVarInitialized = false;
};

class gfxFontconfigFontFamily final : public gfxFontFamily {
 public:
  gfxFontconfigFontFamily(const nsACString& aName, FontVisibility aVisibility)
      : gfxFontFamily(aName, aVisibility),
        mContainsAppFonts(false),
        mHasNonScalableFaces(false),
        mForceScalable(false) {}

  template <typename Func>
  void AddFacesToFontList(Func aAddPatternFunc);

  void FindStyleVariationsLocked(FontInfoData* aFontInfoData = nullptr)
      MOZ_REQUIRES(mLock) override;

  // Families are constructed initially with just references to patterns.
  // When necessary, these are enumerated within FindStyleVariations.
  void AddFontPattern(FcPattern* aFontPattern, bool aSingleName);

  void SetFamilyContainsAppFonts(bool aContainsAppFonts) {
    mContainsAppFonts = aContainsAppFonts;
  }

  void FindAllFontsForStyle(const gfxFontStyle& aFontStyle,
                            nsTArray<gfxFontEntry*>& aFontEntryList,
                            bool aIgnoreSizeTolerance) override;

  bool FilterForFontList(nsAtom* aLangGroup,
                         const nsACString& aGeneric) const final {
    return SupportsLangGroup(aLangGroup);
  }

 protected:
  virtual ~gfxFontconfigFontFamily();

  // helper for FilterForFontList
  bool SupportsLangGroup(nsAtom* aLangGroup) const;

  nsTArray<RefPtr<FcPattern>> mFontPatterns;

  // Number of faces that have a single name. Faces that have multiple names are
  // sorted last.
  uint32_t mUniqueNameFaceCount = 0;
  bool mContainsAppFonts : 1;
  bool mHasNonScalableFaces : 1;
  bool mForceScalable : 1;
};

class gfxFontconfigFont final : public gfxFT2FontBase {
 public:
  gfxFontconfigFont(
      const RefPtr<mozilla::gfx::UnscaledFontFontconfig>& aUnscaledFont,
      RefPtr<mozilla::gfx::SharedFTFace>&& aFTFace, FcPattern* aPattern,
      gfxFloat aAdjustedSize, gfxFontEntry* aFontEntry,
      const gfxFontStyle* aFontStyle, int aLoadFlags, bool aEmbolden);

  FontType GetType() const override { return FONT_TYPE_FONTCONFIG; }
  FcPattern* GetPattern() const { return mPattern; }

  already_AddRefed<mozilla::gfx::ScaledFont> GetScaledFont(
      const TextRunDrawParams& aRunParams) override;

  bool ShouldHintMetrics() const override;

 private:
  ~gfxFontconfigFont() override;

  RefPtr<FcPattern> mPattern;
};

class gfxFcPlatformFontList final : public gfxPlatformFontList {
  using FontPatternListEntry = mozilla::dom::SystemFontListEntry;

 public:
  gfxFcPlatformFontList();

  static gfxFcPlatformFontList* PlatformFontList() {
    return static_cast<gfxFcPlatformFontList*>(
        gfxPlatformFontList::PlatformFontList());
  }

  // initialize font lists
  nsresult InitFontListForPlatform() MOZ_REQUIRES(mLock) override;
  void InitSharedFontListForPlatform() MOZ_REQUIRES(mLock) override;

  void GetFontList(nsAtom* aLangGroup, const nsACString& aGenericFamily,
                   nsTArray<nsString>& aListOfFonts) override;

  void ReadSystemFontList(mozilla::dom::SystemFontList*);

  gfxFontEntry* CreateFontEntry(
      mozilla::fontlist::Face* aFace,
      const mozilla::fontlist::Family* aFamily) override;

  gfxFontEntry* LookupLocalFont(nsPresContext* aPresContext,
                                const nsACString& aFontName,
                                WeightRange aWeightForEntry,
                                StretchRange aStretchForEntry,
                                SlantStyleRange aStyleForEntry) override;

  gfxFontEntry* MakePlatformFont(const nsACString& aFontName,
                                 WeightRange aWeightForEntry,
                                 StretchRange aStretchForEntry,
                                 SlantStyleRange aStyleForEntry,
                                 const uint8_t* aFontData,
                                 uint32_t aLength) override;

  bool FindAndAddFamiliesLocked(
      nsPresContext* aPresContext, mozilla::StyleGenericFontFamily aGeneric,
      const nsACString& aFamily, nsTArray<FamilyAndGeneric>* aOutput,
      FindFamiliesFlags aFlags, gfxFontStyle* aStyle = nullptr,
      nsAtom* aLanguage = nullptr, gfxFloat aDevToCssSize = 1.0)
      MOZ_REQUIRES(mLock) override;

  bool GetStandardFamilyName(const nsCString& aFontName,
                             nsACString& aFamilyName) override;

  FcConfig* GetLastConfig() const { return mLastConfig; }

  // override to use fontconfig lookup for generics
  void AddGenericFonts(nsPresContext* aPresContext,
                       mozilla::StyleGenericFontFamily, nsAtom* aLanguage,
                       nsTArray<FamilyAndGeneric>& aFamilyList) override;

  void ClearLangGroupPrefFontsLocked() MOZ_REQUIRES(mLock) override;

  // clear out cached generic-lang ==> family-list mappings
  void ClearGenericMappings() {
    AutoLock lock(mLock);
    ClearGenericMappingsLocked();
  }
  void ClearGenericMappingsLocked() MOZ_REQUIRES(mLock) {
    mGenericMappings.Clear();
  }

  // map lang group ==> lang string
  // When aForFontEnumerationThread is true, this method will avoid using
  // LanguageService::LookupLanguage, because it is not safe for off-main-
  // thread use (except by stylo traversal, which does the necessary locking)
  void GetSampleLangForGroup(nsAtom* aLanguage, nsACString& aLangStr,
                             bool aForFontEnumerationThread = false);

 protected:
  virtual ~gfxFcPlatformFontList();

#if defined(MOZ_SANDBOX) && defined(XP_LINUX)
  typedef mozilla::SandboxBroker::Policy SandboxPolicy;
#else
  // Dummy type just so we can still have a SandboxPolicy* parameter.
  struct SandboxPolicy {};
#endif

  // Add all the font families found in a font set.
  // aAppFonts indicates whether this is the system or application fontset.
  void AddFontSetFamilies(FcFontSet* aFontSet, const SandboxPolicy* aPolicy,
                          bool aAppFonts) MOZ_REQUIRES(mLock);

  // Helper for above, to add a single font pattern.
  void AddPatternToFontList(FcPattern* aFont, FcChar8*& aLastFamilyName,
                            nsACString& aFamilyName,
                            RefPtr<gfxFontconfigFontFamily>& aFontFamily,
                            bool aAppFonts) MOZ_REQUIRES(mLock);

  // figure out which families fontconfig maps a generic to
  // (aGeneric assumed already lowercase)
  PrefFontList* FindGenericFamilies(nsPresContext* aPresContext,
                                    const nsCString& aGeneric,
                                    nsAtom* aLanguage) MOZ_REQUIRES(mLock);

  // are all pref font settings set to use fontconfig generics?
  bool PrefFontListsUseOnlyGenerics() MOZ_REQUIRES(mLock);

  static void CheckFontUpdates(nsITimer* aTimer, void* aThis);

  FontFamily GetDefaultFontForPlatform(nsPresContext* aPresContext,
                                       const gfxFontStyle* aStyle,
                                       nsAtom* aLanguage = nullptr)
      MOZ_REQUIRES(mLock) override;

  FontVisibility GetVisibilityForFamily(const nsACString& aName) const;

  gfxFontFamily* CreateFontFamily(const nsACString& aName,
                                  FontVisibility aVisibility) const override;

  // helper method for finding an appropriate lang string
  bool TryLangForGroup(const nsACString& aOSLang, nsAtom* aLangGroup,
                       nsACString& aLang, bool aForFontEnumerationThread);

#ifdef MOZ_BUNDLED_FONTS
  void ActivateBundledFonts();
  nsCString mBundledFontsPath;
  bool mBundledFontsInitialized;
#endif

  // to avoid enumerating all fonts, maintain a mapping of local font
  // names to family
  nsTHashMap<nsCString, RefPtr<FcPattern>> mLocalNames;

  // caching generic/lang ==> font family list
  nsClassHashtable<nsCStringHashKey, PrefFontList> mGenericMappings;

  // Caching family lookups as found by FindAndAddFamilies after resolving
  // substitutions. The gfxFontFamily objects cached here are owned by the
  // gfxFcPlatformFontList via its mFamilies table; note that if the main
  // font list is rebuilt (e.g. due to a fontconfig configuration change),
  // these pointers will be invalidated. InitFontList() flushes the cache
  // in this case.
  nsTHashMap<nsCStringHashKey, nsTArray<FamilyAndGeneric>> mFcSubstituteCache;

  nsCOMPtr<nsITimer> mCheckFontUpdatesTimer;
  RefPtr<FcConfig> mLastConfig;

  // The current system font options in effect.
#ifdef MOZ_WIDGET_GTK
  // NOTE(emilio): This is a *system cairo* cairo_font_options_t object. As
  // such, it can't be used outside of the few functions defined here.
  cairo_font_options_t* mSystemFontOptions = nullptr;
  int32_t mFreetypeLcdSetting = -1;  // -1 for not set

  void ClearSystemFontOptions();

  // Returns whether options actually changed.
  // TODO(emilio): We could call this when gsettings change or such, but
  // historically we haven't reacted to these settings changes, so keeping it
  // simple for now.
  bool UpdateSystemFontOptions();

  void UpdateSystemFontOptionsFromIpc(const mozilla::dom::SystemFontOptions&);
  void SystemFontOptionsToIpc(mozilla::dom::SystemFontOptions&);

 public:
  void SubstituteSystemFontOptions(FcPattern*);

 private:
#endif

  // Cache for most recently used language code in FindAndAddFamiliesLocked,
  // and the result of checking whether to use lang-specific lookups.
  RefPtr<nsAtom> mPrevLanguage;
  nsCString mSampleLang;
  bool mUseCustomLookups = false;

  // By default, font prefs under Linux are set to simply lookup
  // via fontconfig the appropriate font for serif/sans-serif/monospace.
  // Rather than check each time a font pref is used, check them all at startup
  // and set a boolean to flag the case that non-default user font prefs exist
  // Note: langGroup == x-math is handled separately
  bool mAlwaysUseFontconfigGenerics;

  static FT_Library sFTLibrary;
};

#endif /* GFXPLATFORMFONTLIST_H_ */