DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Implementation

Mercurial (960f50c2e0a9)

VCS Links

FTUserFontData

UnscaledFontCache

gfxFcPlatformFontList

gfxFontconfigFont

gfxFontconfigFontEntry

gfxFontconfigFontFamily

nsAutoRefTraits

nsAutoRefTraits

Macros

Line Code
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
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * 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 "gfxFont.h"
#include "gfxFontEntry.h"
#include "gfxFT2FontBase.h"
#include "gfxPlatformFontList.h"
#include "mozilla/mozalloc.h"
#include "nsAutoRef.h"
#include "nsClassHashtable.h"

#include <fontconfig/fontconfig.h>
#include "ft2build.h"
#include FT_FREETYPE_H
#include FT_TRUETYPE_TABLES_H
#include <cairo.h>
#include <cairo-ft.h>

#ifdef MOZ_CONTENT_SANDBOX
#include "mozilla/SandboxBroker.h"
#endif

namespace mozilla {
    namespace dom {
        class SystemFontListEntry;
    };
};

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

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

// Helper classes used for clearning out user font data when cairo font
// face is destroyed. Since multiple faces may use the same data, be
// careful to assure that the data is only cleared out when all uses
// expire. The font entry object contains a refptr to FTUserFontData and
// each cairo font created from that font entry contains a
// FTUserFontDataRef with a refptr to that same FTUserFontData object.

class FTUserFontData {
public:
    NS_INLINE_DECL_THREADSAFE_REFCOUNTING(FTUserFontData)

    explicit FTUserFontData(FT_Face aFace, const uint8_t* aData)
        : mFace(aFace), mFontData(aData)
    {
    }

    const uint8_t *FontData() const { return mFontData; }

private:
    ~FTUserFontData()
    {
        mozilla::gfx::Factory::ReleaseFTFace(mFace);
        if (mFontData) {
            free((void*)mFontData);
        }
    }

    FT_Face        mFace;
    const uint8_t *mFontData;
};

// 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 : public gfxFontEntry {
public:
    // used for system fonts with explicit patterns
    explicit gfxFontconfigFontEntry(const nsAString& 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 nsAString& aFaceName,
                                    uint16_t aWeight,
                                    int16_t aStretch,
                                    uint8_t aStyle,
                                    const uint8_t *aData,
                                    FT_Face aFace);

    // used for @font-face local system fonts with explicit patterns
    explicit gfxFontconfigFontEntry(const nsAString& aFaceName,
                                    FcPattern* aFontPattern,
                                    uint16_t aWeight,
                                    int16_t aStretch,
                                    uint8_t aStyle);

    gfxFontEntry* Clone() const override;

    FcPattern* GetPattern() { return mFontPattern; }

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

    hb_blob_t* GetFontTable(uint32_t aTableTag) override;

    void ForgetHBFace() override;
    void ReleaseGrFace(gr_face* aFace) override;

    double GetAspect();

protected:
    virtual ~gfxFontconfigFontEntry();

    gfxFont *CreateFontInstance(const gfxFontStyle *aFontStyle,
                                bool aNeedsBold) override;

    // helper method for creating cairo font from pattern
    cairo_scaled_font_t*
    CreateScaledFont(FcPattern* aRenderPattern,
                     gfxFloat aAdjustedSize,
                     const gfxFontStyle *aStyle,
                     bool aNeedsBold);

    // override to pull data from FTFace
    virtual nsresult
    CopyFontTable(uint32_t aTableTag,
                  nsTArray<uint8_t>& aBuffer) override;

    // if HB or GR faces are gone, close down the FT_Face
    void MaybeReleaseFTFace();

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

    // user font data, when needed
    RefPtr<FTUserFontData> mUserFontData;

    // FTFace - initialized when needed
    FT_Face   mFTFace;
    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;

    double    mAspect;

    // data font
    const uint8_t* mFontData;

    class UnscaledFontCache
    {
    public:
        already_AddRefed<mozilla::gfx::UnscaledFontFontconfig>
        Lookup(const char* 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;
};

class gfxFontconfigFontFamily : public gfxFontFamily {
public:
    explicit gfxFontconfigFontFamily(const nsAString& aName) :
        gfxFontFamily(aName),
        mContainsAppFonts(false),
        mHasNonScalableFaces(false),
        mForceScalable(false)
    { }

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

    void FindStyleVariations(FontInfoData *aFontInfoData = nullptr) override;

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

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

    void
    FindAllFontsForStyle(const gfxFontStyle& aFontStyle,
                         nsTArray<gfxFontEntry*>& aFontEntryList,
                         bool& aNeedsSyntheticBold,
                         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<nsCountedRef<FcPattern> > mFontPatterns;

    bool      mContainsAppFonts;
    bool      mHasNonScalableFaces;
    bool      mForceScalable;
};

class gfxFontconfigFont : public gfxFT2FontBase {
public:
    gfxFontconfigFont(const RefPtr<mozilla::gfx::UnscaledFontFontconfig> &aUnscaledFont,
                      cairo_scaled_font_t *aScaledFont,
                      FcPattern *aPattern,
                      gfxFloat aAdjustedSize,
                      gfxFontEntry *aFontEntry,
                      const gfxFontStyle *aFontStyle,
                      bool aNeedsBold);

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

    virtual already_AddRefed<mozilla::gfx::ScaledFont>
    GetScaledFont(DrawTarget *aTarget) override;

private:
    virtual ~gfxFontconfigFont();

    nsCountedRef<FcPattern> mPattern;
};

class gfxFcPlatformFontList : public gfxPlatformFontList {
public:
    gfxFcPlatformFontList();

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

    // initialize font lists
    virtual nsresult InitFontListForPlatform() override;

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

    void ReadSystemFontList(
        InfallibleTArray<mozilla::dom::SystemFontListEntry>* retValue);

    gfxFontEntry*
    LookupLocalFont(const nsAString& aFontName, uint16_t aWeight,
                    int16_t aStretch, uint8_t aStyle) override;

    gfxFontEntry*
    MakePlatformFont(const nsAString& aFontName, uint16_t aWeight,
                     int16_t aStretch,
                     uint8_t aStyle,
                     const uint8_t* aFontData,
                     uint32_t aLength) override;

    bool FindAndAddFamilies(const nsAString& aFamily,
                            nsTArray<gfxFontFamily*>* aOutput,
                            FindFamiliesFlags aFlags,
                            gfxFontStyle* aStyle = nullptr,
                            gfxFloat aDevToCssSize = 1.0) override;

    bool GetStandardFamilyName(const nsAString& aFontName,
                               nsAString& aFamilyName) override;

    FcConfig* GetLastConfig() const { return mLastConfig; }

    // override to use fontconfig lookup for generics
    void AddGenericFonts(mozilla::FontFamilyType aGenericType,
                         nsAtom* aLanguage,
                         nsTArray<gfxFontFamily*>& aFamilyList) override;

    void ClearLangGroupPrefFonts() override;

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

    static FT_Library GetFTLibrary();

protected:
    virtual ~gfxFcPlatformFontList();

#ifdef MOZ_CONTENT_SANDBOX
    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);

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

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

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

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

    virtual gfxFontFamily*
    GetDefaultFontForPlatform(const gfxFontStyle* aStyle) override;

    gfxFontFamily* CreateFontFamily(const nsAString& aName) const override;

#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
    nsBaseHashtable<nsStringHashKey,
                    nsCountedRef<FcPattern>,
                    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.
    nsDataHashtable<nsCStringHashKey,
                    nsTArray<gfxFontFamily*>> mFcSubstituteCache;

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

    // 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 sCairoFTLibrary;
};

#endif /* GFXPLATFORMFONTLIST_H_ */