Add m-esr52 at 52.6.0

1 files changed, 1866 insertions, 0 deletions

diff --git a/gfx/thebes/gfxFcPlatformFontList.cpp b/gfx/thebes/gfxFcPlatformFontList.cpp
new file mode 100644
index 000000000..601e7a90c
--- /dev/null
+++ b/gfx/thebes/gfxFcPlatformFontList.cpp
@@ -0,0 +1,1866 @@
+/* -*- 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/. */
+
+#include "mozilla/Logging.h"
+
+#include "gfxFcPlatformFontList.h"
+#include "gfxFont.h"
+#include "gfxFontConstants.h"
+#include "gfxFontFamilyList.h"
+#include "gfxFT2Utils.h"
+#include "gfxPlatform.h"
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/Sprintf.h"
+#include "mozilla/TimeStamp.h"
+#include "nsGkAtoms.h"
+#include "nsILanguageAtomService.h"
+#include "nsUnicodeProperties.h"
+#include "nsUnicodeRange.h"
+#include "nsDirectoryServiceUtils.h"
+#include "nsDirectoryServiceDefs.h"
+#include "nsAppDirectoryServiceDefs.h"
+#include "nsCharSeparatedTokenizer.h"
+
+#include "mozilla/gfx/HelpersCairo.h"
+
+#include <fontconfig/fcfreetype.h>
+
+#ifdef MOZ_WIDGET_GTK
+#include <gdk/gdk.h>
+#include "gfxPlatformGtk.h"
+#endif
+
+#ifdef MOZ_X11
+#include "mozilla/X11Util.h"
+#endif
+
+using namespace mozilla;
+using namespace mozilla::unicode;
+
+#ifndef FC_POSTSCRIPT_NAME
+#define FC_POSTSCRIPT_NAME  "postscriptname"      /* String */
+#endif
+
+#define PRINTING_FC_PROPERTY "gfx.printing"
+
+#define LOG_FONTLIST(args) MOZ_LOG(gfxPlatform::GetLog(eGfxLog_fontlist), \
+                               LogLevel::Debug, args)
+#define LOG_FONTLIST_ENABLED() MOZ_LOG_TEST( \
+                                   gfxPlatform::GetLog(eGfxLog_fontlist), \
+                                   LogLevel::Debug)
+#define LOG_CMAPDATA_ENABLED() MOZ_LOG_TEST( \
+                                   gfxPlatform::GetLog(eGfxLog_cmapdata), \
+                                   LogLevel::Debug)
+
+static const FcChar8*
+ToFcChar8Ptr(const char* aStr)
+{
+    return reinterpret_cast<const FcChar8*>(aStr);
+}
+
+static const char*
+ToCharPtr(const FcChar8 *aStr)
+{
+    return reinterpret_cast<const char*>(aStr);
+}
+
+FT_Library gfxFcPlatformFontList::sCairoFTLibrary = nullptr;
+
+static cairo_user_data_key_t sFcFontlistUserFontDataKey;
+
+// canonical name ==> first en name or first name if no en name
+// This is the required logic for fullname lookups as per CSS3 Fonts spec.
+static uint32_t
+FindCanonicalNameIndex(FcPattern* aFont, const char* aLangField)
+{
+    uint32_t n = 0, en = 0;
+    FcChar8* lang;
+    while (FcPatternGetString(aFont, aLangField, n, &lang) == FcResultMatch) {
+        // look for 'en' or variants, en-US, en-JP etc.
+        uint32_t len = strlen(ToCharPtr(lang));
+        bool enPrefix = (strncmp(ToCharPtr(lang), "en", 2) == 0);
+        if (enPrefix && (len == 2 || (len > 2 && aLangField[2] == '-'))) {
+            en = n;
+            break;
+        }
+        n++;
+    }
+    return en;
+}
+
+static void
+GetFaceNames(FcPattern* aFont, const nsAString& aFamilyName,
+             nsAString& aPostscriptName, nsAString& aFullname)
+{
+    // get the Postscript name
+    FcChar8* psname;
+    if (FcPatternGetString(aFont, FC_POSTSCRIPT_NAME, 0, &psname) == FcResultMatch) {
+        AppendUTF8toUTF16(ToCharPtr(psname), aPostscriptName);
+    }
+
+    // get the canonical fullname (i.e. en name or first name)
+    uint32_t en = FindCanonicalNameIndex(aFont, FC_FULLNAMELANG);
+    FcChar8* fullname;
+    if (FcPatternGetString(aFont, FC_FULLNAME, en, &fullname) == FcResultMatch) {
+        AppendUTF8toUTF16(ToCharPtr(fullname), aFullname);
+    }
+
+    // if have fullname, done
+    if (!aFullname.IsEmpty()) {
+        return;
+    }
+
+    // otherwise, set the fullname to family + style name [en] and use that
+    aFullname.Append(aFamilyName);
+
+    // figure out the en style name
+    en = FindCanonicalNameIndex(aFont, FC_STYLELANG);
+    nsAutoString style;
+    FcChar8* stylename = nullptr;
+    FcPatternGetString(aFont, FC_STYLE, en, &stylename);
+    if (stylename) {
+        AppendUTF8toUTF16(ToCharPtr(stylename), style);
+    }
+
+    if (!style.IsEmpty() && !style.EqualsLiteral("Regular")) {
+        aFullname.Append(' ');
+        aFullname.Append(style);
+    }
+}
+
+static uint16_t
+MapFcWeight(int aFcWeight)
+{
+    if (aFcWeight <= (FC_WEIGHT_THIN + FC_WEIGHT_EXTRALIGHT) / 2) {
+        return 100;
+    } else if (aFcWeight <= (FC_WEIGHT_EXTRALIGHT + FC_WEIGHT_LIGHT) / 2) {
+        return 200;
+    } else if (aFcWeight <= (FC_WEIGHT_LIGHT + FC_WEIGHT_BOOK) / 2) {
+        return 300;
+    } else if (aFcWeight <= (FC_WEIGHT_REGULAR + FC_WEIGHT_MEDIUM) / 2) {
+        // This includes FC_WEIGHT_BOOK
+        return 400;
+    } else if (aFcWeight <= (FC_WEIGHT_MEDIUM + FC_WEIGHT_DEMIBOLD) / 2) {
+        return 500;
+    } else if (aFcWeight <= (FC_WEIGHT_DEMIBOLD + FC_WEIGHT_BOLD) / 2) {
+        return 600;
+    } else if (aFcWeight <= (FC_WEIGHT_BOLD + FC_WEIGHT_EXTRABOLD) / 2) {
+        return 700;
+    } else if (aFcWeight <= (FC_WEIGHT_EXTRABOLD + FC_WEIGHT_BLACK) / 2) {
+        return 800;
+    } else if (aFcWeight <= FC_WEIGHT_BLACK) {
+        return 900;
+    }
+
+    // including FC_WEIGHT_EXTRABLACK
+    return 901;
+}
+
+static int16_t
+MapFcWidth(int aFcWidth)
+{
+    if (aFcWidth <= (FC_WIDTH_ULTRACONDENSED + FC_WIDTH_EXTRACONDENSED) / 2) {
+        return NS_FONT_STRETCH_ULTRA_CONDENSED;
+    }
+    if (aFcWidth <= (FC_WIDTH_EXTRACONDENSED + FC_WIDTH_CONDENSED) / 2) {
+        return NS_FONT_STRETCH_EXTRA_CONDENSED;
+    }
+    if (aFcWidth <= (FC_WIDTH_CONDENSED + FC_WIDTH_SEMICONDENSED) / 2) {
+        return NS_FONT_STRETCH_CONDENSED;
+    }
+    if (aFcWidth <= (FC_WIDTH_SEMICONDENSED + FC_WIDTH_NORMAL) / 2) {
+        return NS_FONT_STRETCH_SEMI_CONDENSED;
+    }
+    if (aFcWidth <= (FC_WIDTH_NORMAL + FC_WIDTH_SEMIEXPANDED) / 2) {
+        return NS_FONT_STRETCH_NORMAL;
+    }
+    if (aFcWidth <= (FC_WIDTH_SEMIEXPANDED + FC_WIDTH_EXPANDED) / 2) {
+        return NS_FONT_STRETCH_SEMI_EXPANDED;
+    }
+    if (aFcWidth <= (FC_WIDTH_EXPANDED + FC_WIDTH_EXTRAEXPANDED) / 2) {
+        return NS_FONT_STRETCH_EXPANDED;
+    }
+    if (aFcWidth <= (FC_WIDTH_EXTRAEXPANDED + FC_WIDTH_ULTRAEXPANDED) / 2) {
+        return NS_FONT_STRETCH_EXTRA_EXPANDED;
+    }
+    return NS_FONT_STRETCH_ULTRA_EXPANDED;
+}
+
+gfxFontconfigFontEntry::gfxFontconfigFontEntry(const nsAString& aFaceName,
+                                               FcPattern* aFontPattern,
+                                               bool aIgnoreFcCharmap)
+        : gfxFontEntry(aFaceName), mFontPattern(aFontPattern),
+          mFTFace(nullptr), mFTFaceInitialized(false),
+          mIgnoreFcCharmap(aIgnoreFcCharmap),
+          mAspect(0.0), mFontData(nullptr)
+{
+    // italic
+    int slant;
+    if (FcPatternGetInteger(aFontPattern, FC_SLANT, 0, &slant) != FcResultMatch) {
+        slant = FC_SLANT_ROMAN;
+    }
+    if (slant == FC_SLANT_OBLIQUE) {
+        mStyle = NS_FONT_STYLE_OBLIQUE;
+    } else if (slant > 0) {
+        mStyle = NS_FONT_STYLE_ITALIC;
+    }
+
+    // weight
+    int weight;
+    if (FcPatternGetInteger(aFontPattern, FC_WEIGHT, 0, &weight) != FcResultMatch) {
+        weight = FC_WEIGHT_REGULAR;
+    }
+    mWeight = MapFcWeight(weight);
+
+    // width
+    int width;
+    if (FcPatternGetInteger(aFontPattern, FC_WIDTH, 0, &width) != FcResultMatch) {
+        width = FC_WIDTH_NORMAL;
+    }
+    mStretch = MapFcWidth(width);
+}
+
+gfxFontconfigFontEntry::gfxFontconfigFontEntry(const nsAString& aFaceName,
+                                               uint16_t aWeight,
+                                               int16_t aStretch,
+                                               uint8_t aStyle,
+                                               const uint8_t *aData,
+                                               FT_Face aFace)
+    : gfxFontEntry(aFaceName),
+      mFTFace(aFace), mFTFaceInitialized(true),
+      mIgnoreFcCharmap(true),
+      mAspect(0.0), mFontData(aData)
+{
+    mWeight = aWeight;
+    mStyle = aStyle;
+    mStretch = aStretch;
+    mIsDataUserFont = true;
+
+    // Use fontconfig to fill out the pattern from the FTFace.
+    // The "file" argument cannot be nullptr (in fontconfig-2.6.0 at
+    // least). The dummy file passed here is removed below.
+    //
+    // When fontconfig scans the system fonts, FcConfigGetBlanks(nullptr)
+    // is passed as the "blanks" argument, which provides that unexpectedly
+    // blank glyphs are elided.  Here, however, we pass nullptr for
+    // "blanks", effectively assuming that, if the font has a blank glyph,
+    // then the author intends any associated character to be rendered
+    // blank.
+    mFontPattern = FcFreeTypeQueryFace(mFTFace, ToFcChar8Ptr(""), 0, nullptr);
+    // given that we have a FT_Face, not really sure this is possible...
+    if (!mFontPattern) {
+        mFontPattern = FcPatternCreate();
+    }
+    FcPatternDel(mFontPattern, FC_FILE);
+    FcPatternDel(mFontPattern, FC_INDEX);
+
+    // Make a new pattern and store the face in it so that cairo uses
+    // that when creating a cairo font face.
+    FcPatternAddFTFace(mFontPattern, FC_FT_FACE, mFTFace);
+
+    mUserFontData = new FTUserFontData(mFTFace, mFontData);
+}
+
+gfxFontconfigFontEntry::gfxFontconfigFontEntry(const nsAString& aFaceName,
+                                               FcPattern* aFontPattern,
+                                               uint16_t aWeight,
+                                               int16_t aStretch,
+                                               uint8_t aStyle)
+        : gfxFontEntry(aFaceName), mFontPattern(aFontPattern),
+          mFTFace(nullptr), mFTFaceInitialized(false),
+          mAspect(0.0), mFontData(nullptr)
+{
+    mWeight = aWeight;
+    mStyle = aStyle;
+    mStretch = aStretch;
+    mIsLocalUserFont = true;
+
+    // The proper setting of mIgnoreFcCharmap is tricky for fonts loaded
+    // via src:local()...
+    // If the local font happens to come from the application fontset,
+    // we want to set it to true so that color/svg fonts will work even
+    // if the default glyphs are blank; but if the local font is a non-
+    // sfnt face (e.g. legacy type 1) then we need to set it to false
+    // because our cmap-reading code will fail and we depend on FT+Fc to
+    // determine the coverage.
+    // We set the flag here, but may flip it the first time TestCharacterMap
+    // is called, at which point we'll look to see whether a 'cmap' is
+    // actually present in the font.
+    mIgnoreFcCharmap = true;
+}
+
+gfxFontconfigFontEntry::~gfxFontconfigFontEntry()
+{
+}
+
+static bool
+PatternHasLang(const FcPattern *aPattern, const FcChar8 *aLang)
+{
+    FcLangSet *langset;
+
+    if (FcPatternGetLangSet(aPattern, FC_LANG, 0, &langset) != FcResultMatch) {
+        return false;
+    }
+
+    if (FcLangSetHasLang(langset, aLang) != FcLangDifferentLang) {
+        return true;
+    }
+    return false;
+}
+
+bool
+gfxFontconfigFontEntry::SupportsLangGroup(nsIAtom *aLangGroup) const
+{
+    if (!aLangGroup || aLangGroup == nsGkAtoms::Unicode) {
+        return true;
+    }
+
+    nsAutoCString fcLang;
+    gfxFcPlatformFontList* pfl = gfxFcPlatformFontList::PlatformFontList();
+    pfl->GetSampleLangForGroup(aLangGroup, fcLang);
+    if (fcLang.IsEmpty()) {
+        return true;
+    }
+
+    // is lang included in the underlying pattern?
+    return PatternHasLang(mFontPattern, ToFcChar8Ptr(fcLang.get()));
+}
+
+nsresult
+gfxFontconfigFontEntry::ReadCMAP(FontInfoData *aFontInfoData)
+{
+    // attempt this once, if errors occur leave a blank cmap
+    if (mCharacterMap) {
+        return NS_OK;
+    }
+
+    RefPtr<gfxCharacterMap> charmap;
+    nsresult rv;
+    bool symbolFont = false; // currently ignored
+
+    if (aFontInfoData && (charmap = GetCMAPFromFontInfo(aFontInfoData,
+                                                        mUVSOffset,
+                                                        symbolFont))) {
+        rv = NS_OK;
+    } else {
+        uint32_t kCMAP = TRUETYPE_TAG('c','m','a','p');
+        charmap = new gfxCharacterMap();
+        AutoTable cmapTable(this, kCMAP);
+
+        if (cmapTable) {
+            bool unicodeFont = false; // currently ignored
+            uint32_t cmapLen;
+            const uint8_t* cmapData =
+                reinterpret_cast<const uint8_t*>(hb_blob_get_data(cmapTable,
+                                                                  &cmapLen));
+            rv = gfxFontUtils::ReadCMAP(cmapData, cmapLen,
+                                        *charmap, mUVSOffset,
+                                        unicodeFont, symbolFont);
+        } else {
+            rv = NS_ERROR_NOT_AVAILABLE;
+        }
+    }
+
+    mHasCmapTable = NS_SUCCEEDED(rv);
+    if (mHasCmapTable) {
+        gfxPlatformFontList *pfl = gfxPlatformFontList::PlatformFontList();
+        mCharacterMap = pfl->FindCharMap(charmap);
+    } else {
+        // if error occurred, initialize to null cmap
+        mCharacterMap = new gfxCharacterMap();
+    }
+
+    LOG_FONTLIST(("(fontlist-cmap) name: %s, size: %d hash: %8.8x%s\n",
+                  NS_ConvertUTF16toUTF8(mName).get(),
+                  charmap->SizeOfIncludingThis(moz_malloc_size_of),
+                  charmap->mHash, mCharacterMap == charmap ? " new" : ""));
+    if (LOG_CMAPDATA_ENABLED()) {
+        char prefix[256];
+        SprintfLiteral(prefix, "(cmapdata) name: %.220s",
+                       NS_ConvertUTF16toUTF8(mName).get());
+        charmap->Dump(prefix, eGfxLog_cmapdata);
+    }
+
+    return rv;
+}
+
+static bool
+HasChar(FcPattern *aFont, FcChar32 aCh)
+{
+    FcCharSet *charset = nullptr;
+    FcPatternGetCharSet(aFont, FC_CHARSET, 0, &charset);
+    return charset && FcCharSetHasChar(charset, aCh);
+}
+
+bool
+gfxFontconfigFontEntry::TestCharacterMap(uint32_t aCh)
+{
+    // For user fonts, or for fonts bundled with the app (which might include
+    // color/svg glyphs where the default glyphs may be blank, and thus confuse
+    // fontconfig/freetype's char map checking), we instead check the cmap
+    // directly for character coverage.
+    if (mIgnoreFcCharmap) {
+        // If it does not actually have a cmap, switch our strategy to use
+        // fontconfig's charmap after all (except for data fonts, which must
+        // always have a cmap to have passed OTS validation).
+        if (!mIsDataUserFont && !HasFontTable(TRUETYPE_TAG('c','m','a','p'))) {
+            mIgnoreFcCharmap = false;
+            // ...and continue with HasChar() below.
+        } else {
+            return gfxFontEntry::TestCharacterMap(aCh);
+        }
+    }
+    // otherwise (for system fonts), use the charmap in the pattern
+    return HasChar(mFontPattern, aCh);
+}
+
+hb_blob_t*
+gfxFontconfigFontEntry::GetFontTable(uint32_t aTableTag)
+{
+    // for data fonts, read directly from the font data
+    if (mFontData) {
+        return gfxFontUtils::GetTableFromFontData(mFontData, aTableTag);
+    }
+
+    return gfxFontEntry::GetFontTable(aTableTag);
+}
+
+void
+gfxFontconfigFontEntry::MaybeReleaseFTFace()
+{
+    // don't release if either HB or Gr face still exists
+    if (mHBFace || mGrFace) {
+        return;
+    }
+    // only close out FT_Face for system fonts, not for data fonts
+    if (!mIsDataUserFont) {
+        if (mFTFace) {
+            FT_Done_Face(mFTFace);
+            mFTFace = nullptr;
+        }
+        mFTFaceInitialized = false;
+    }
+}
+
+void
+gfxFontconfigFontEntry::ForgetHBFace()
+{
+    gfxFontEntry::ForgetHBFace();
+    MaybeReleaseFTFace();
+}
+
+void
+gfxFontconfigFontEntry::ReleaseGrFace(gr_face* aFace)
+{
+    gfxFontEntry::ReleaseGrFace(aFace);
+    MaybeReleaseFTFace();
+}
+
+double
+gfxFontconfigFontEntry::GetAspect()
+{
+    if (mAspect == 0.0) {
+        // default to aspect = 0.5
+        mAspect = 0.5;
+
+        // create a font to calculate x-height / em-height
+        gfxFontStyle s;
+        s.size = 100.0; // pick large size to avoid possible hinting artifacts
+        RefPtr<gfxFont> font = FindOrMakeFont(&s, false);
+        if (font) {
+            const gfxFont::Metrics& metrics =
+                font->GetMetrics(gfxFont::eHorizontal);
+
+            // The factor of 0.1 ensures that xHeight is sane so fonts don't
+            // become huge.  Strictly ">" ensures that xHeight and emHeight are
+            // not both zero.
+            if (metrics.xHeight > 0.1 * metrics.emHeight) {
+                mAspect = metrics.xHeight / metrics.emHeight;
+            }
+        }
+    }
+    return mAspect;
+}
+
+static void
+PrepareFontOptions(FcPattern* aPattern,
+                   cairo_font_options_t* aFontOptions)
+{
+    NS_ASSERTION(aFontOptions, "null font options passed to PrepareFontOptions");
+
+    // xxx - taken from the gfxFontconfigFonts code, needs to be reviewed
+
+    FcBool printing;
+    if (FcPatternGetBool(aPattern, PRINTING_FC_PROPERTY, 0, &printing) !=
+            FcResultMatch) {
+        printing = FcFalse;
+    }
+
+    // Font options are set explicitly here to improve cairo's caching
+    // behavior and to record the relevant parts of the pattern for
+    // SetupCairoFont (so that the pattern can be released).
+    //
+    // Most font_options have already been set as defaults on the FcPattern
+    // with cairo_ft_font_options_substitute(), then user and system
+    // fontconfig configurations were applied.  The resulting font_options
+    // have been recorded on the face during
+    // cairo_ft_font_face_create_for_pattern().
+    //
+    // None of the settings here cause this scaled_font to behave any
+    // differently from how it would behave if it were created from the same
+    // face with default font_options.
+    //
+    // We set options explicitly so that the same scaled_font will be found in
+    // the cairo_scaled_font_map when cairo loads glyphs from a context with
+    // the same font_face, font_matrix, ctm, and surface font_options.
+    //
+    // Unfortunately, _cairo_scaled_font_keys_equal doesn't know about the
+    // font_options on the cairo_ft_font_face, and doesn't consider default
+    // option values to not match any explicit values.
+    //
+    // Even after cairo_set_scaled_font is used to set font_options for the
+    // cairo context, when cairo looks for a scaled_font for the context, it
+    // will look for a font with some option values from the target surface if
+    // any values are left default on the context font_options.  If this
+    // scaled_font is created with default font_options, cairo will not find
+    // it.
+    //
+    // The one option not recorded in the pattern is hint_metrics, which will
+    // affect glyph metrics.  The default behaves as CAIRO_HINT_METRICS_ON.
+    // We should be considering the font_options of the surface on which this
+    // font will be used, but currently we don't have different gfxFonts for
+    // different surface font_options, so we'll create a font suitable for the
+    // Screen. Image and xlib surfaces default to CAIRO_HINT_METRICS_ON.
+    if (printing) {
+        cairo_font_options_set_hint_metrics(aFontOptions, CAIRO_HINT_METRICS_OFF);
+    } else {
+        cairo_font_options_set_hint_metrics(aFontOptions, CAIRO_HINT_METRICS_ON);
+    }
+
+    // The remaining options have been recorded on the pattern and the face.
+    // _cairo_ft_options_merge has some logic to decide which options from the
+    // scaled_font or from the cairo_ft_font_face take priority in the way the
+    // font behaves.
+    //
+    // In the majority of cases, _cairo_ft_options_merge uses the options from
+    // the cairo_ft_font_face, so sometimes it is not so important which
+    // values are set here so long as they are not defaults, but we'll set
+    // them to the exact values that we expect from the font, to be consistent
+    // and to protect against changes in cairo.
+    //
+    // In some cases, _cairo_ft_options_merge uses some options from the
+    // scaled_font's font_options rather than options on the
+    // cairo_ft_font_face (from fontconfig).
+    // https://bugs.freedesktop.org/show_bug.cgi?id=11838
+    //
+    // Surface font options were set on the pattern in
+    // cairo_ft_font_options_substitute.  If fontconfig has changed the
+    // hint_style then that is what the user (or distribution) wants, so we
+    // use the setting from the FcPattern.
+    //
+    // Fallback values here mirror treatment of defaults in cairo-ft-font.c.
+    FcBool hinting = FcFalse;
+    if (FcPatternGetBool(aPattern, FC_HINTING, 0, &hinting) != FcResultMatch) {
+        hinting = FcTrue;
+    }
+
+    cairo_hint_style_t hint_style;
+    if (printing || !hinting) {
+        hint_style = CAIRO_HINT_STYLE_NONE;
+    } else {
+        int fc_hintstyle;
+        if (FcPatternGetInteger(aPattern, FC_HINT_STYLE,
+                                0, &fc_hintstyle) != FcResultMatch) {
+            fc_hintstyle = FC_HINT_FULL;
+        }
+        switch (fc_hintstyle) {
+            case FC_HINT_NONE:
+                hint_style = CAIRO_HINT_STYLE_NONE;
+                break;
+            case FC_HINT_SLIGHT:
+                hint_style = CAIRO_HINT_STYLE_SLIGHT;
+                break;
+            case FC_HINT_MEDIUM:
+            default: // This fallback mirrors _get_pattern_ft_options in cairo.
+                hint_style = CAIRO_HINT_STYLE_MEDIUM;
+                break;
+            case FC_HINT_FULL:
+                hint_style = CAIRO_HINT_STYLE_FULL;
+                break;
+        }
+    }
+    cairo_font_options_set_hint_style(aFontOptions, hint_style);
+
+    int rgba;
+    if (FcPatternGetInteger(aPattern,
+                            FC_RGBA, 0, &rgba) != FcResultMatch) {
+        rgba = FC_RGBA_UNKNOWN;
+    }
+    cairo_subpixel_order_t subpixel_order = CAIRO_SUBPIXEL_ORDER_DEFAULT;
+    switch (rgba) {
+        case FC_RGBA_UNKNOWN:
+        case FC_RGBA_NONE:
+        default:
+            // There is no CAIRO_SUBPIXEL_ORDER_NONE.  Subpixel antialiasing
+            // is disabled through cairo_antialias_t.
+            rgba = FC_RGBA_NONE;
+            // subpixel_order won't be used by the font as we won't use
+            // CAIRO_ANTIALIAS_SUBPIXEL, but don't leave it at default for
+            // caching reasons described above.  Fall through:
+            MOZ_FALLTHROUGH;
+        case FC_RGBA_RGB:
+            subpixel_order = CAIRO_SUBPIXEL_ORDER_RGB;
+            break;
+        case FC_RGBA_BGR:
+            subpixel_order = CAIRO_SUBPIXEL_ORDER_BGR;
+            break;
+        case FC_RGBA_VRGB:
+            subpixel_order = CAIRO_SUBPIXEL_ORDER_VRGB;
+            break;
+        case FC_RGBA_VBGR:
+            subpixel_order = CAIRO_SUBPIXEL_ORDER_VBGR;
+            break;
+    }
+    cairo_font_options_set_subpixel_order(aFontOptions, subpixel_order);
+
+    FcBool fc_antialias;
+    if (FcPatternGetBool(aPattern,
+                         FC_ANTIALIAS, 0, &fc_antialias) != FcResultMatch) {
+        fc_antialias = FcTrue;
+    }
+    cairo_antialias_t antialias;
+    if (!fc_antialias) {
+        antialias = CAIRO_ANTIALIAS_NONE;
+    } else if (rgba == FC_RGBA_NONE) {
+        antialias = CAIRO_ANTIALIAS_GRAY;
+    } else {
+        antialias = CAIRO_ANTIALIAS_SUBPIXEL;
+    }
+    cairo_font_options_set_antialias(aFontOptions, antialias);
+}
+
+cairo_scaled_font_t*
+gfxFontconfigFontEntry::CreateScaledFont(FcPattern* aRenderPattern,
+                                         gfxFloat aAdjustedSize,
+                                         const gfxFontStyle *aStyle,
+                                         bool aNeedsBold)
+{
+    if (aNeedsBold) {
+        FcPatternAddBool(aRenderPattern, FC_EMBOLDEN, FcTrue);
+    }
+
+    // synthetic oblique by skewing via the font matrix
+    bool needsOblique = IsUpright() &&
+                        aStyle->style != NS_FONT_STYLE_NORMAL &&
+                        aStyle->allowSyntheticStyle;
+
+    if (needsOblique) {
+        // disable embedded bitmaps (mimics behavior in 90-synthetic.conf)
+        FcPatternDel(aRenderPattern, FC_EMBEDDED_BITMAP);
+        FcPatternAddBool(aRenderPattern, FC_EMBEDDED_BITMAP, FcFalse);
+    }
+
+    cairo_font_face_t *face =
+        cairo_ft_font_face_create_for_pattern(aRenderPattern);
+
+    if (mFontData) {
+        // for data fonts, add the face/data pointer to the cairo font face
+        // so that it gets deleted whenever cairo decides
+        NS_ASSERTION(mFTFace, "FT_Face is null when setting user data");
+        NS_ASSERTION(mUserFontData, "user font data is null when setting user data");
+        cairo_font_face_set_user_data(face,
+                                      &sFcFontlistUserFontDataKey,
+                                      new FTUserFontDataRef(mUserFontData),
+                                      FTUserFontDataRef::Destroy);
+    }
+
+    cairo_scaled_font_t *scaledFont = nullptr;
+
+    cairo_matrix_t sizeMatrix;
+    cairo_matrix_t identityMatrix;
+
+    cairo_matrix_init_scale(&sizeMatrix, aAdjustedSize, aAdjustedSize);
+    cairo_matrix_init_identity(&identityMatrix);
+
+    if (needsOblique) {
+        const double kSkewFactor = OBLIQUE_SKEW_FACTOR;
+
+        cairo_matrix_t style;
+        cairo_matrix_init(&style,
+                          1,                //xx
+                          0,                //yx
+                          -1 * kSkewFactor,  //xy
+                          1,                //yy
+                          0,                //x0
+                          0);               //y0
+        cairo_matrix_multiply(&sizeMatrix, &sizeMatrix, &style);
+    }
+
+    cairo_font_options_t *fontOptions = cairo_font_options_create();
+    PrepareFontOptions(aRenderPattern, fontOptions);
+
+    scaledFont = cairo_scaled_font_create(face, &sizeMatrix,
+                                          &identityMatrix, fontOptions);
+    cairo_font_options_destroy(fontOptions);
+
+    NS_ASSERTION(cairo_scaled_font_status(scaledFont) == CAIRO_STATUS_SUCCESS,
+                 "Failed to make scaled font");
+
+    cairo_font_face_destroy(face);
+
+    return scaledFont;
+}
+
+#ifdef MOZ_WIDGET_GTK
+// defintion included below
+static void ApplyGdkScreenFontOptions(FcPattern *aPattern);
+#endif
+
+#ifdef MOZ_X11
+static bool
+GetXftInt(Display* aDisplay, const char* aName, int* aResult)
+{
+    if (!aDisplay) {
+        return false;
+    }
+    char* value = XGetDefault(aDisplay, "Xft", aName);
+    if (!value) {
+        return false;
+    }
+    if (FcNameConstant(const_cast<FcChar8*>(ToFcChar8Ptr(value)), aResult)) {
+        return true;
+    }
+    char* end;
+    *aResult = strtol(value, &end, 0);
+    if (end != value) {
+        return true;
+    }
+    return false;
+}
+#endif
+
+static void
+PreparePattern(FcPattern* aPattern, bool aIsPrinterFont)
+{
+    FcConfigSubstitute(nullptr, aPattern, FcMatchPattern);
+
+    // This gets cairo_font_options_t for the Screen.  We should have
+    // different font options for printing (no hinting) but we are not told
+    // what we are measuring for.
+    //
+    // If cairo adds support for lcd_filter, gdk will not provide the default
+    // setting for that option.  We could get the default setting by creating
+    // an xlib surface once, recording its font_options, and then merging the
+    // gdk options.
+    //
+    // Using an xlib surface would also be an option to get Screen font
+    // options for non-GTK X11 toolkits, but less efficient than using GDK to
+    // pick up dynamic changes.
+    if(aIsPrinterFont) {
+       cairo_font_options_t *options = cairo_font_options_create();
+       cairo_font_options_set_hint_style (options, CAIRO_HINT_STYLE_NONE);
+       cairo_font_options_set_antialias (options, CAIRO_ANTIALIAS_GRAY);
+       cairo_ft_font_options_substitute(options, aPattern);
+       cairo_font_options_destroy(options);
+       FcPatternAddBool(aPattern, PRINTING_FC_PROPERTY, FcTrue);
+    } else {
+#ifdef MOZ_WIDGET_GTK
+       ApplyGdkScreenFontOptions(aPattern);
+#endif
+
+#ifdef MOZ_X11
+        FcValue value;
+        int lcdfilter;
+        if (FcPatternGet(aPattern, FC_LCD_FILTER, 0, &value)
+                == FcResultNoMatch &&
+            GetXftInt(DefaultXDisplay(), "lcdfilter", &lcdfilter)) {
+            FcPatternAddInteger(aPattern, FC_LCD_FILTER, lcdfilter);
+        }
+#endif
+    }
+
+    FcDefaultSubstitute(aPattern);
+}
+
+static inline gfxFloat
+SizeForStyle(gfxFontconfigFontEntry* aEntry, const gfxFontStyle& aStyle)
+{
+    return aStyle.sizeAdjust >= 0.0 ?
+                aStyle.GetAdjustedSize(aEntry->GetAspect()) :
+                aStyle.size;
+}
+
+static double
+ChooseFontSize(gfxFontconfigFontEntry* aEntry,
+               const gfxFontStyle& aStyle)
+{
+    double requestedSize = SizeForStyle(aEntry, aStyle);
+    double bestDist = -1.0;
+    double bestSize = requestedSize;
+    double size;
+    int v = 0;
+    while (FcPatternGetDouble(aEntry->GetPattern(),
+                              FC_PIXEL_SIZE, v, &size) == FcResultMatch) {
+        ++v;
+        double dist = fabs(size - requestedSize);
+        if (bestDist < 0.0 || dist < bestDist) {
+            bestDist = dist;
+            bestSize = size;
+        }
+    }
+    return bestSize;
+}
+
+gfxFont*
+gfxFontconfigFontEntry::CreateFontInstance(const gfxFontStyle *aFontStyle,
+                                           bool aNeedsBold)
+{
+    nsAutoRef<FcPattern> pattern(FcPatternCreate());
+    if (!pattern) {
+        NS_WARNING("Failed to create Fontconfig pattern for font instance");
+        return nullptr;
+    }
+
+    double size = ChooseFontSize(this, *aFontStyle);
+    FcPatternAddDouble(pattern, FC_PIXEL_SIZE, size);
+
+    PreparePattern(pattern, aFontStyle->printerFont);
+    nsAutoRef<FcPattern> renderPattern
+        (FcFontRenderPrepare(nullptr, pattern, mFontPattern));
+    if (!renderPattern) {
+        NS_WARNING("Failed to prepare Fontconfig pattern for font instance");
+        return nullptr;
+    }
+
+    cairo_scaled_font_t* scaledFont =
+        CreateScaledFont(renderPattern, size, aFontStyle, aNeedsBold);
+    gfxFont* newFont =
+        new gfxFontconfigFont(scaledFont, renderPattern, size,
+                              this, aFontStyle, aNeedsBold);
+    cairo_scaled_font_destroy(scaledFont);
+
+    return newFont;
+}
+
+nsresult
+gfxFontconfigFontEntry::CopyFontTable(uint32_t aTableTag,
+                                      nsTArray<uint8_t>& aBuffer)
+{
+    NS_ASSERTION(!mIsDataUserFont,
+                 "data fonts should be reading tables directly from memory");
+
+    if (!mFTFaceInitialized) {
+        mFTFaceInitialized = true;
+        FcChar8 *filename;
+        if (FcPatternGetString(mFontPattern, FC_FILE, 0, &filename) != FcResultMatch) {
+            return NS_ERROR_FAILURE;
+        }
+        int index;
+        if (FcPatternGetInteger(mFontPattern, FC_INDEX, 0, &index) != FcResultMatch) {
+            index = 0; // default to 0 if not found in pattern
+        }
+        if (FT_New_Face(gfxFcPlatformFontList::GetFTLibrary(),
+                        (const char*)filename, index, &mFTFace) != 0) {
+            return NS_ERROR_FAILURE;
+        }
+    }
+
+    if (!mFTFace) {
+        return NS_ERROR_NOT_AVAILABLE;
+    }
+
+    FT_ULong length = 0;
+    if (FT_Load_Sfnt_Table(mFTFace, aTableTag, 0, nullptr, &length) != 0) {
+        return NS_ERROR_NOT_AVAILABLE;
+    }
+    if (!aBuffer.SetLength(length, fallible)) {
+        return NS_ERROR_OUT_OF_MEMORY;
+    }
+    if (FT_Load_Sfnt_Table(mFTFace, aTableTag, 0, aBuffer.Elements(), &length) != 0) {
+        aBuffer.Clear();
+        return NS_ERROR_FAILURE;
+    }
+
+    return NS_OK;
+}
+
+void
+gfxFontconfigFontFamily::FindStyleVariations(FontInfoData *aFontInfoData)
+{
+    if (mHasStyles) {
+        return;
+    }
+
+    // add font entries for each of the faces
+    uint32_t numFonts = mFontPatterns.Length();
+    NS_ASSERTION(numFonts, "font family containing no faces!!");
+    uint32_t numRegularFaces = 0;
+    for (uint32_t i = 0; i < numFonts; i++) {
+        FcPattern* face = mFontPatterns[i];
+
+        // figure out the psname/fullname and choose which to use as the facename
+        nsAutoString psname, fullname;
+        GetFaceNames(face, mName, psname, fullname);
+        const nsAutoString& faceName = !psname.IsEmpty() ? psname : fullname;
+
+        gfxFontconfigFontEntry *fontEntry =
+            new gfxFontconfigFontEntry(faceName, face, mContainsAppFonts);
+        AddFontEntry(fontEntry);
+
+        if (fontEntry->IsUpright() &&
+            fontEntry->Weight() == NS_FONT_WEIGHT_NORMAL &&
+            fontEntry->Stretch() == NS_FONT_STRETCH_NORMAL) {
+            numRegularFaces++;
+        }
+
+        if (LOG_FONTLIST_ENABLED()) {
+            LOG_FONTLIST(("(fontlist) added (%s) to family (%s)"
+                 " with style: %s weight: %d stretch: %d"
+                 " psname: %s fullname: %s",
+                 NS_ConvertUTF16toUTF8(fontEntry->Name()).get(),
+                 NS_ConvertUTF16toUTF8(Name()).get(),
+                 (fontEntry->IsItalic()) ?
+                  "italic" : (fontEntry->IsOblique() ? "oblique" : "normal"),
+                 fontEntry->Weight(), fontEntry->Stretch(),
+                 NS_ConvertUTF16toUTF8(psname).get(),
+                 NS_ConvertUTF16toUTF8(fullname).get()));
+        }
+    }
+
+    // somewhat arbitrary, but define a family with two or more regular
+    // faces as a family for which intra-family fallback should be used
+    if (numRegularFaces > 1) {
+        mCheckForFallbackFaces = true;
+    }
+    mFaceNamesInitialized = true;
+    mFontPatterns.Clear();
+    SetHasStyles(true);
+}
+
+void
+gfxFontconfigFontFamily::AddFontPattern(FcPattern* aFontPattern)
+{
+    NS_ASSERTION(!mHasStyles,
+                 "font patterns must not be added to already enumerated families");
+
+    FcBool scalable;
+    if (FcPatternGetBool(aFontPattern, FC_SCALABLE, 0, &scalable) != FcResultMatch ||
+        !scalable) {
+        mHasNonScalableFaces = true;
+    }
+
+    nsCountedRef<FcPattern> pattern(aFontPattern);
+    mFontPatterns.AppendElement(pattern);
+}
+
+static const double kRejectDistance = 10000.0;
+
+// Calculate a distance score representing the size disparity between the
+// requested style's size and the font entry's size.
+static double
+SizeDistance(gfxFontconfigFontEntry* aEntry, const gfxFontStyle& aStyle)
+{
+    double requestedSize = SizeForStyle(aEntry, aStyle);
+    double bestDist = -1.0;
+    double size;
+    int v = 0;
+    while (FcPatternGetDouble(aEntry->GetPattern(),
+                              FC_PIXEL_SIZE, v, &size) == FcResultMatch) {
+        ++v;
+        double dist = fabs(size - requestedSize);
+        if (bestDist < 0.0 || dist < bestDist) {
+            bestDist = dist;
+        }
+    }
+    if (bestDist < 0.0) {
+        // No size means scalable
+        return -1.0;
+    } else if (5.0 * bestDist < requestedSize) {
+        // fontconfig prefers a matching family or lang to pixelsize of bitmap
+        // fonts. CSS suggests a tolerance of 20% on pixelsize.
+        return bestDist;
+    } else {
+        // Reject any non-scalable fonts that are not within tolerance.
+        return kRejectDistance;
+    }
+}
+
+void
+gfxFontconfigFontFamily::FindAllFontsForStyle(const gfxFontStyle& aFontStyle,
+                                              nsTArray<gfxFontEntry*>& aFontEntryList,
+                                              bool& aNeedsSyntheticBold)
+{
+    gfxFontFamily::FindAllFontsForStyle(aFontStyle,
+                                        aFontEntryList,
+                                        aNeedsSyntheticBold);
+
+    if (!mHasNonScalableFaces) {
+        return;
+    }
+
+    // Iterate over the the available fonts while compacting any groups
+    // of unscalable fonts with matching styles into a single entry
+    // corresponding to the closest available size. If the closest
+    // available size is rejected for being outside tolernace, then the
+    // entire group will be skipped.
+    size_t skipped = 0;
+    gfxFontconfigFontEntry* bestEntry = nullptr;
+    double bestDist = -1.0;
+    for (size_t i = 0; i < aFontEntryList.Length(); i++) {
+        gfxFontconfigFontEntry* entry =
+            static_cast<gfxFontconfigFontEntry*>(aFontEntryList[i]);
+        double dist = SizeDistance(entry, aFontStyle);
+        // If the entry is scalable or has a style that does not match
+        // the group of unscalable fonts, then start a new group.
+        if (dist < 0.0 ||
+            !bestEntry ||
+            bestEntry->Stretch() != entry->Stretch() ||
+            bestEntry->Weight() != entry->Weight() ||
+            bestEntry->mStyle != entry->mStyle) {
+            // If the best entry in this group is still outside the tolerance,
+            // then skip the entire group.
+            if (bestDist >= kRejectDistance) {
+                skipped++;
+            }
+            // Remove any compacted entries from the previous group.
+            if (skipped) {
+                i -= skipped;
+                aFontEntryList.RemoveElementsAt(i, skipped);
+                skipped = 0;
+            }
+            // Mark the start of the new group.
+            bestEntry = entry;
+            bestDist = dist;
+        } else {
+            // If this entry more closely matches the requested size than the
+            // current best in the group, then take this entry instead.
+            if (dist < bestDist) {
+                aFontEntryList[i-1-skipped] = entry;
+                bestEntry = entry;
+                bestDist = dist;
+            }
+            skipped++;
+        }
+    }
+    // If the best entry in this group is still outside the tolerance,
+    // then skip the entire group.
+    if (bestDist >= kRejectDistance) {
+        skipped++;
+    }
+    // Remove any compacted entries from the current group.
+    if (skipped) {
+        aFontEntryList.TruncateLength(aFontEntryList.Length() - skipped);
+    }
+}
+
+gfxFontconfigFont::gfxFontconfigFont(cairo_scaled_font_t *aScaledFont,
+                                     FcPattern *aPattern,
+                                     gfxFloat aAdjustedSize,
+                                     gfxFontEntry *aFontEntry,
+                                     const gfxFontStyle *aFontStyle,
+                                     bool aNeedsBold) :
+    gfxFontconfigFontBase(aScaledFont, aPattern, aFontEntry, aFontStyle)
+{
+    mAdjustedSize = aAdjustedSize;
+}
+
+gfxFontconfigFont::~gfxFontconfigFont()
+{
+}
+
+gfxFcPlatformFontList::gfxFcPlatformFontList()
+    : mLocalNames(64)
+    , mGenericMappings(32)
+    , mFcSubstituteCache(64)
+    , mLastConfig(nullptr)
+    , mAlwaysUseFontconfigGenerics(true)
+{
+    // if the rescan interval is set, start the timer
+    int rescanInterval = FcConfigGetRescanInterval(nullptr);
+    if (rescanInterval) {
+        mLastConfig = FcConfigGetCurrent();
+        mCheckFontUpdatesTimer = do_CreateInstance("@mozilla.org/timer;1");
+        if (mCheckFontUpdatesTimer) {
+            mCheckFontUpdatesTimer->
+                InitWithFuncCallback(CheckFontUpdates, this,
+                                     (rescanInterval + 1) * 1000,
+                                     nsITimer::TYPE_REPEATING_SLACK);
+        } else {
+            NS_WARNING("Failure to create font updates timer");
+        }
+    }
+
+#ifdef MOZ_BUNDLED_FONTS
+    mBundledFontsInitialized = false;
+#endif
+}
+
+gfxFcPlatformFontList::~gfxFcPlatformFontList()
+{
+    if (mCheckFontUpdatesTimer) {
+        mCheckFontUpdatesTimer->Cancel();
+        mCheckFontUpdatesTimer = nullptr;
+    }
+}
+
+void
+gfxFcPlatformFontList::AddFontSetFamilies(FcFontSet* aFontSet, bool aAppFonts)
+{
+    // This iterates over the fonts in a font set and adds in gfxFontFamily
+    // objects for each family. The patterns for individual fonts are not
+    // copied here. When a family is actually used, the fonts in the family
+    // are enumerated and the patterns copied. Note that we're explicitly
+    // excluding non-scalable fonts such as X11 bitmap fonts, which
+    // Chrome Skia/Webkit code does also.
+
+    if (!aFontSet) {
+        NS_WARNING("AddFontSetFamilies called with a null font set.");
+        return;
+    }
+
+    FcChar8* lastFamilyName = (FcChar8*)"";
+    RefPtr<gfxFontconfigFontFamily> fontFamily;
+    nsAutoString familyName;
+    for (int f = 0; f < aFontSet->nfont; f++) {
+        FcPattern* font = aFontSet->fonts[f];
+
+        // get canonical name
+        uint32_t cIndex = FindCanonicalNameIndex(font, FC_FAMILYLANG);
+        FcChar8* canonical = nullptr;
+        FcPatternGetString(font, FC_FAMILY, cIndex, &canonical);
+        if (!canonical) {
+            continue;
+        }
+
+        // same as the last one? no need to add a new family, skip
+        if (FcStrCmp(canonical, lastFamilyName) != 0) {
+            lastFamilyName = canonical;
+
+            // add new family if one doesn't already exist
+            familyName.Truncate();
+            AppendUTF8toUTF16(ToCharPtr(canonical), familyName);
+            nsAutoString keyName(familyName);
+            ToLowerCase(keyName);
+
+            fontFamily = static_cast<gfxFontconfigFontFamily*>
+                             (mFontFamilies.GetWeak(keyName));
+            if (!fontFamily) {
+                fontFamily = new gfxFontconfigFontFamily(familyName);
+                mFontFamilies.Put(keyName, fontFamily);
+            }
+            // Record if the family contains fonts from the app font set
+            // (in which case we won't rely on fontconfig's charmap, due to
+            // bug 1276594).
+            if (aAppFonts) {
+                fontFamily->SetFamilyContainsAppFonts(true);
+            }
+
+            // Add pointers to other localized family names. Most fonts
+            // only have a single name, so the first call to GetString
+            // will usually not match
+            FcChar8* otherName;
+            int n = (cIndex == 0 ? 1 : 0);
+            while (FcPatternGetString(font, FC_FAMILY, n, &otherName) == FcResultMatch) {
+                NS_ConvertUTF8toUTF16 otherFamilyName(ToCharPtr(otherName));
+                AddOtherFamilyName(fontFamily, otherFamilyName);
+                n++;
+                if (n == int(cIndex)) {
+                    n++; // skip over canonical name
+                }
+            }
+        }
+
+        NS_ASSERTION(fontFamily, "font must belong to a font family");
+        fontFamily->AddFontPattern(font);
+
+        // map the psname, fullname ==> font family for local font lookups
+        nsAutoString psname, fullname;
+        GetFaceNames(font, familyName, psname, fullname);
+        if (!psname.IsEmpty()) {
+            ToLowerCase(psname);
+            mLocalNames.Put(psname, font);
+        }
+        if (!fullname.IsEmpty()) {
+            ToLowerCase(fullname);
+            mLocalNames.Put(fullname, font);
+        }
+    }
+}
+
+nsresult
+gfxFcPlatformFontList::InitFontListForPlatform()
+{
+    mLastConfig = FcConfigGetCurrent();
+
+    mLocalNames.Clear();
+    mFcSubstituteCache.Clear();
+
+    // iterate over available fonts
+    FcFontSet* systemFonts = FcConfigGetFonts(nullptr, FcSetSystem);
+    AddFontSetFamilies(systemFonts, /* aAppFonts = */ false);
+    mAlwaysUseFontconfigGenerics = PrefFontListsUseOnlyGenerics();
+
+#ifdef MOZ_BUNDLED_FONTS
+    ActivateBundledFonts();
+    FcFontSet* appFonts = FcConfigGetFonts(nullptr, FcSetApplication);
+    AddFontSetFamilies(appFonts, /* aAppFonts = */ true);
+#endif
+
+    mOtherFamilyNamesInitialized = true;
+
+    return NS_OK;
+}
+
+// For displaying the fontlist in UI, use explicit call to FcFontList. Using
+// FcFontList results in the list containing the localized names as dictated
+// by system defaults.
+static void
+GetSystemFontList(nsTArray<nsString>& aListOfFonts, nsIAtom *aLangGroup)
+{
+    aListOfFonts.Clear();
+
+    nsAutoRef<FcPattern> pat(FcPatternCreate());
+    if (!pat) {
+        return;
+    }
+
+    nsAutoRef<FcObjectSet> os(FcObjectSetBuild(FC_FAMILY, nullptr));
+    if (!os) {
+        return;
+    }
+
+    // add the lang to the pattern
+    nsAutoCString fcLang;
+    gfxFcPlatformFontList* pfl = gfxFcPlatformFontList::PlatformFontList();
+    pfl->GetSampleLangForGroup(aLangGroup, fcLang);
+    if (!fcLang.IsEmpty()) {
+        FcPatternAddString(pat, FC_LANG, ToFcChar8Ptr(fcLang.get()));
+    }
+
+    nsAutoRef<FcFontSet> fs(FcFontList(nullptr, pat, os));
+    if (!fs) {
+        return;
+    }
+
+    for (int i = 0; i < fs->nfont; i++) {
+        char *family;
+
+        if (FcPatternGetString(fs->fonts[i], FC_FAMILY, 0,
+                               (FcChar8 **) &family) != FcResultMatch)
+        {
+            continue;
+        }
+
+        // Remove duplicates...
+        nsAutoString strFamily;
+        AppendUTF8toUTF16(family, strFamily);
+        if (aListOfFonts.Contains(strFamily)) {
+            continue;
+        }
+
+        aListOfFonts.AppendElement(strFamily);
+    }
+
+    aListOfFonts.Sort();
+}
+
+void
+gfxFcPlatformFontList::GetFontList(nsIAtom *aLangGroup,
+                                   const nsACString& aGenericFamily,
+                                   nsTArray<nsString>& aListOfFonts)
+{
+    // Get the list of font family names using fontconfig
+    GetSystemFontList(aListOfFonts, aLangGroup);
+
+    // Under Linux, the generics "serif", "sans-serif" and "monospace"
+    // are included in the pref fontlist. These map to whatever fontconfig
+    // decides they should be for a given language, rather than one of the
+    // fonts listed in the prefs font lists (e.g. font.name.*, font.name-list.*)
+    bool serif = false, sansSerif = false, monospace = false;
+    if (aGenericFamily.IsEmpty())
+        serif = sansSerif = monospace = true;
+    else if (aGenericFamily.LowerCaseEqualsLiteral("serif"))
+        serif = true;
+    else if (aGenericFamily.LowerCaseEqualsLiteral("sans-serif"))
+        sansSerif = true;
+    else if (aGenericFamily.LowerCaseEqualsLiteral("monospace"))
+        monospace = true;
+    else if (aGenericFamily.LowerCaseEqualsLiteral("cursive") ||
+             aGenericFamily.LowerCaseEqualsLiteral("fantasy"))
+        serif = sansSerif = true;
+    else
+        NS_NOTREACHED("unexpected CSS generic font family");
+
+    // The first in the list becomes the default in
+    // FontBuilder.readFontSelection() if the preference-selected font is not
+    // available, so put system configured defaults first.
+    if (monospace)
+        aListOfFonts.InsertElementAt(0, NS_LITERAL_STRING("monospace"));
+    if (sansSerif)
+        aListOfFonts.InsertElementAt(0, NS_LITERAL_STRING("sans-serif"));
+    if (serif)
+        aListOfFonts.InsertElementAt(0, NS_LITERAL_STRING("serif"));
+}
+
+gfxFontFamily*
+gfxFcPlatformFontList::GetDefaultFontForPlatform(const gfxFontStyle* aStyle)
+{
+    // Get the default font by using a fake name to retrieve the first
+    // scalable font that fontconfig suggests for the given language.
+    PrefFontList* prefFonts =
+        FindGenericFamilies(NS_LITERAL_STRING("-moz-default"), aStyle->language);
+    NS_ASSERTION(prefFonts, "null list of generic fonts");
+    if (prefFonts && !prefFonts->IsEmpty()) {
+        return (*prefFonts)[0];
+    }
+    return nullptr;
+}
+
+gfxFontEntry*
+gfxFcPlatformFontList::LookupLocalFont(const nsAString& aFontName,
+                                       uint16_t aWeight,
+                                       int16_t aStretch,
+                                       uint8_t aStyle)
+{
+    nsAutoString keyName(aFontName);
+    ToLowerCase(keyName);
+
+    // if name is not in the global list, done
+    FcPattern* fontPattern = mLocalNames.Get(keyName);
+    if (!fontPattern) {
+        return nullptr;
+    }
+
+    return new gfxFontconfigFontEntry(aFontName, fontPattern,
+                                      aWeight, aStretch, aStyle);
+}
+
+gfxFontEntry*
+gfxFcPlatformFontList::MakePlatformFont(const nsAString& aFontName,
+                                        uint16_t aWeight,
+                                        int16_t aStretch,
+                                        uint8_t aStyle,
+                                        const uint8_t* aFontData,
+                                        uint32_t aLength)
+{
+    FT_Face face;
+    FT_Error error =
+        FT_New_Memory_Face(gfxFcPlatformFontList::GetFTLibrary(),
+                           aFontData, aLength, 0, &face);
+    if (error != FT_Err_Ok) {
+        NS_Free((void*)aFontData);
+        return nullptr;
+    }
+    if (FT_Err_Ok != FT_Select_Charmap(face, FT_ENCODING_UNICODE)) {
+        FT_Done_Face(face);
+        NS_Free((void*)aFontData);
+        return nullptr;
+    }
+
+    return new gfxFontconfigFontEntry(aFontName, aWeight, aStretch,
+                                      aStyle, aFontData, face);
+}
+
+bool
+gfxFcPlatformFontList::FindAndAddFamilies(const nsAString& aFamily,
+                                          nsTArray<gfxFontFamily*>* aOutput,
+                                          gfxFontStyle* aStyle,
+                                          gfxFloat aDevToCssSize)
+{
+    nsAutoString familyName(aFamily);
+    ToLowerCase(familyName);
+    nsIAtom* language = (aStyle ? aStyle->language.get() : nullptr);
+
+    // deprecated generic names are explicitly converted to standard generics
+    bool isDeprecatedGeneric = false;
+    if (familyName.EqualsLiteral("sans") ||
+        familyName.EqualsLiteral("sans serif")) {
+        familyName.AssignLiteral("sans-serif");
+        isDeprecatedGeneric = true;
+    } else if (familyName.EqualsLiteral("mono")) {
+        familyName.AssignLiteral("monospace");
+        isDeprecatedGeneric = true;
+    }
+
+    // fontconfig generics? use fontconfig to determine the family for lang
+    if (isDeprecatedGeneric ||
+        mozilla::FontFamilyName::Convert(familyName).IsGeneric()) {
+        PrefFontList* prefFonts = FindGenericFamilies(familyName, language);
+        if (prefFonts && !prefFonts->IsEmpty()) {
+            aOutput->AppendElements(*prefFonts);
+            return true;
+        }
+        return false;
+    }
+
+    // fontconfig allows conditional substitutions in such a way that it's
+    // difficult to distinguish an explicit substitution from other suggested
+    // choices. To sniff out explicit substitutions, compare the substitutions
+    // for "font, -moz-sentinel" to "-moz-sentinel" to sniff out the
+    // substitutions
+    //
+    // Example:
+    //
+    //   serif ==> DejaVu Serif, ...
+    //   Helvetica, serif ==> Helvetica, TeX Gyre Heros, Nimbus Sans L, DejaVu Serif
+    //
+    // In this case fontconfig is including Tex Gyre Heros and
+    // Nimbus Sans L as alternatives for Helvetica.
+
+    // Because the FcConfigSubstitute call is quite expensive, we cache the
+    // actual font families found via this process. So check the cache first:
+    NS_ConvertUTF16toUTF8 familyToFind(familyName);
+    AutoTArray<gfxFontFamily*,10> cachedFamilies;
+    if (mFcSubstituteCache.Get(familyToFind, &cachedFamilies)) {
+        if (cachedFamilies.IsEmpty()) {
+            return false;
+        }
+        aOutput->AppendElements(cachedFamilies);
+        return true;
+    }
+
+    // It wasn't in the cache, so we need to ask fontconfig...
+    const FcChar8* kSentinelName = ToFcChar8Ptr("-moz-sentinel");
+    FcChar8* sentinelFirstFamily = nullptr;
+    nsAutoRef<FcPattern> sentinelSubst(FcPatternCreate());
+    FcPatternAddString(sentinelSubst, FC_FAMILY, kSentinelName);
+    FcConfigSubstitute(nullptr, sentinelSubst, FcMatchPattern);
+    FcPatternGetString(sentinelSubst, FC_FAMILY, 0, &sentinelFirstFamily);
+
+    // substitutions for font, -moz-sentinel pattern
+    nsAutoRef<FcPattern> fontWithSentinel(FcPatternCreate());
+    FcPatternAddString(fontWithSentinel, FC_FAMILY,
+                       ToFcChar8Ptr(familyToFind.get()));
+    FcPatternAddString(fontWithSentinel, FC_FAMILY, kSentinelName);
+    FcConfigSubstitute(nullptr, fontWithSentinel, FcMatchPattern);
+
+    // Add all font family matches until reaching the sentinel.
+    FcChar8* substName = nullptr;
+    for (int i = 0;
+         FcPatternGetString(fontWithSentinel, FC_FAMILY,
+                            i, &substName) == FcResultMatch;
+         i++)
+    {
+        NS_ConvertUTF8toUTF16 subst(ToCharPtr(substName));
+        if (sentinelFirstFamily &&
+            FcStrCmp(substName, sentinelFirstFamily) == 0) {
+            break;
+        }
+        gfxPlatformFontList::FindAndAddFamilies(subst, &cachedFamilies);
+    }
+
+    // Cache the resulting list, so we don't have to do this again.
+    mFcSubstituteCache.Put(familyToFind, cachedFamilies);
+
+    if (cachedFamilies.IsEmpty()) {
+        return false;
+    }
+    aOutput->AppendElements(cachedFamilies);
+    return true;
+}
+
+bool
+gfxFcPlatformFontList::GetStandardFamilyName(const nsAString& aFontName,
+                                             nsAString& aFamilyName)
+{
+    aFamilyName.Truncate();
+
+    // The fontconfig list of fonts includes generic family names in the
+    // font list. For these, just use the generic name.
+    if (aFontName.EqualsLiteral("serif") ||
+        aFontName.EqualsLiteral("sans-serif") ||
+        aFontName.EqualsLiteral("monospace")) {
+        aFamilyName.Assign(aFontName);
+        return true;
+    }
+
+    nsAutoRef<FcPattern> pat(FcPatternCreate());
+    if (!pat) {
+        return true;
+    }
+
+    nsAutoRef<FcObjectSet> os(FcObjectSetBuild(FC_FAMILY, nullptr));
+    if (!os) {
+        return true;
+    }
+
+    // add the family name to the pattern
+    NS_ConvertUTF16toUTF8 familyName(aFontName);
+    FcPatternAddString(pat, FC_FAMILY, ToFcChar8Ptr(familyName.get()));
+
+    nsAutoRef<FcFontSet> givenFS(FcFontList(nullptr, pat, os));
+    if (!givenFS) {
+        return true;
+    }
+
+    // See if there is a font face with first family equal to the given family
+    // (needs to be in sync with names coming from GetFontList())
+    nsTArray<nsCString> candidates;
+    for (int i = 0; i < givenFS->nfont; i++) {
+        char* firstFamily;
+
+        if (FcPatternGetString(givenFS->fonts[i], FC_FAMILY, 0,
+                               (FcChar8 **) &firstFamily) != FcResultMatch)
+        {
+            continue;
+        }
+
+        nsDependentCString first(firstFamily);
+        if (!candidates.Contains(first)) {
+            candidates.AppendElement(first);
+
+            if (familyName.Equals(first)) {
+                aFamilyName.Assign(aFontName);
+                return true;
+            }
+        }
+    }
+
+    // Because fontconfig conflates different family name types, need to
+    // double check that the candidate name is not simply a different
+    // name type. For example, if a font with nameID=16 "Minion Pro" and
+    // nameID=21 "Minion Pro Caption" exists, calling FcFontList with
+    // family="Minion Pro" will return a set of patterns some of which
+    // will have a first family of "Minion Pro Caption". Ignore these
+    // patterns and use the first candidate that maps to a font set with
+    // the same number of faces and an identical set of patterns.
+    for (uint32_t j = 0; j < candidates.Length(); ++j) {
+        FcPatternDel(pat, FC_FAMILY);
+        FcPatternAddString(pat, FC_FAMILY, (FcChar8 *)candidates[j].get());
+
+        nsAutoRef<FcFontSet> candidateFS(FcFontList(nullptr, pat, os));
+        if (!candidateFS) {
+            return true;
+        }
+
+        if (candidateFS->nfont != givenFS->nfont) {
+            continue;
+        }
+
+        bool equal = true;
+        for (int i = 0; i < givenFS->nfont; ++i) {
+            if (!FcPatternEqual(candidateFS->fonts[i], givenFS->fonts[i])) {
+                equal = false;
+                break;
+            }
+        }
+        if (equal) {
+            AppendUTF8toUTF16(candidates[j], aFamilyName);
+            return true;
+        }
+    }
+
+    // didn't find localized name, leave family name blank
+    return true;
+}
+
+static const char kFontNamePrefix[] = "font.name.";
+
+void
+gfxFcPlatformFontList::AddGenericFonts(mozilla::FontFamilyType aGenericType,
+                                       nsIAtom* aLanguage,
+                                       nsTArray<gfxFontFamily*>& aFamilyList)
+{
+    bool usePrefFontList = false;
+
+    // treat -moz-fixed as monospace
+    if (aGenericType == eFamily_moz_fixed) {
+        aGenericType = eFamily_monospace;
+    }
+
+    const char* generic = GetGenericName(aGenericType);
+    NS_ASSERTION(generic, "weird generic font type");
+    if (!generic) {
+        return;
+    }
+
+    // By default, most font prefs on Linux map to "use fontconfig"
+    // keywords. So only need to explicitly lookup font pref if
+    // non-default settings exist
+    NS_ConvertASCIItoUTF16 genericToLookup(generic);
+    if ((!mAlwaysUseFontconfigGenerics && aLanguage) ||
+        aLanguage == nsGkAtoms::x_math) {
+        nsIAtom* langGroup = GetLangGroup(aLanguage);
+        nsAutoCString langGroupStr;
+        if (langGroup) {
+            langGroup->ToUTF8String(langGroupStr);
+        }
+        nsAutoCString prefFontName(kFontNamePrefix);
+        prefFontName.Append(generic);
+        prefFontName.Append('.');
+        prefFontName.Append(langGroupStr);
+        nsAdoptingString fontlistValue = Preferences::GetString(prefFontName.get());
+        if (fontlistValue) {
+            if (!fontlistValue.EqualsLiteral("serif") &&
+                !fontlistValue.EqualsLiteral("sans-serif") &&
+                !fontlistValue.EqualsLiteral("monospace")) {
+                usePrefFontList = true;
+            } else {
+                // serif, sans-serif or monospace was specified
+                genericToLookup.Assign(fontlistValue);
+            }
+        }
+    }
+
+    // when pref fonts exist, use standard pref font lookup
+    if (usePrefFontList) {
+        return gfxPlatformFontList::AddGenericFonts(aGenericType,
+                                                    aLanguage,
+                                                    aFamilyList);
+    }
+
+    PrefFontList* prefFonts = FindGenericFamilies(genericToLookup, aLanguage);
+    NS_ASSERTION(prefFonts, "null generic font list");
+    aFamilyList.AppendElements(*prefFonts);
+}
+
+void
+gfxFcPlatformFontList::ClearLangGroupPrefFonts()
+{
+    ClearGenericMappings();
+    gfxPlatformFontList::ClearLangGroupPrefFonts();
+    mAlwaysUseFontconfigGenerics = PrefFontListsUseOnlyGenerics();
+}
+
+/* static */ FT_Library
+gfxFcPlatformFontList::GetFTLibrary()
+{
+    if (!sCairoFTLibrary) {
+        // Use cairo's FT_Library so that cairo takes care of shutdown of the
+        // FT_Library after it has destroyed its font_faces, and FT_Done_Face
+        // has been called on each FT_Face, at least until this bug is fixed:
+        // https://bugs.freedesktop.org/show_bug.cgi?id=18857
+        //
+        // Cairo keeps it's own FT_Library object for creating FT_Face
+        // instances, so use that. There's no simple API for accessing this
+        // so use the hacky method below of making a font and extracting
+        // the library pointer from that.
+
+        bool needsBold;
+        gfxFontStyle style;
+        gfxPlatformFontList* pfl = gfxPlatformFontList::PlatformFontList();
+        gfxFontFamily* family = pfl->GetDefaultFont(&style);
+        NS_ASSERTION(family, "couldn't find a default font family");
+        gfxFontEntry* fe = family->FindFontForStyle(style, needsBold);
+        if (!fe) {
+            return nullptr;
+        }
+        RefPtr<gfxFont> font = fe->FindOrMakeFont(&style, false);
+        if (!font) {
+            return nullptr;
+        }
+
+        gfxFT2FontBase* ft2Font = reinterpret_cast<gfxFT2FontBase*>(font.get());
+        gfxFT2LockedFace face(ft2Font);
+        if (!face.get()) {
+            return nullptr;
+        }
+
+        sCairoFTLibrary = face.get()->glyph->library;
+    }
+
+    return sCairoFTLibrary;
+}
+
+gfxPlatformFontList::PrefFontList*
+gfxFcPlatformFontList::FindGenericFamilies(const nsAString& aGeneric,
+                                           nsIAtom* aLanguage)
+{
+    // set up name
+    NS_ConvertUTF16toUTF8 generic(aGeneric);
+
+    nsAutoCString fcLang;
+    GetSampleLangForGroup(aLanguage, fcLang);
+    ToLowerCase(fcLang);
+
+    nsAutoCString genericLang(generic);
+    if (fcLang.Length() > 0) {
+        genericLang.Append('-');
+    }
+    genericLang.Append(fcLang);
+
+    // try to get the family from the cache
+    PrefFontList* prefFonts = mGenericMappings.Get(genericLang);
+    if (prefFonts) {
+        return prefFonts;
+    }
+
+    // if not found, ask fontconfig to pick the appropriate font
+    nsAutoRef<FcPattern> genericPattern(FcPatternCreate());
+    FcPatternAddString(genericPattern, FC_FAMILY,
+                       ToFcChar8Ptr(generic.get()));
+
+    // -- prefer scalable fonts
+    FcPatternAddBool(genericPattern, FC_SCALABLE, FcTrue);
+
+    // -- add the lang to the pattern
+    if (!fcLang.IsEmpty()) {
+        FcPatternAddString(genericPattern, FC_LANG,
+                           ToFcChar8Ptr(fcLang.get()));
+    }
+
+    // -- perform substitutions
+    FcConfigSubstitute(nullptr, genericPattern, FcMatchPattern);
+    FcDefaultSubstitute(genericPattern);
+
+    // -- sort to get the closest matches
+    FcResult result;
+    nsAutoRef<FcFontSet> faces(FcFontSort(nullptr, genericPattern, FcFalse,
+                                          nullptr, &result));
+
+    if (!faces) {
+      return nullptr;
+    }
+
+    // -- select the fonts to be used for the generic
+    prefFonts = new PrefFontList; // can be empty but in practice won't happen
+    uint32_t limit = gfxPlatformGtk::GetPlatform()->MaxGenericSubstitions();
+    bool foundFontWithLang = false;
+    for (int i = 0; i < faces->nfont; i++) {
+        FcPattern* font = faces->fonts[i];
+        FcChar8* mappedGeneric = nullptr;
+
+        FcPatternGetString(font, FC_FAMILY, 0, &mappedGeneric);
+        if (mappedGeneric) {
+            NS_ConvertUTF8toUTF16 mappedGenericName(ToCharPtr(mappedGeneric));
+            AutoTArray<gfxFontFamily*,1> genericFamilies;
+            if (gfxPlatformFontList::FindAndAddFamilies(mappedGenericName,
+                                                        &genericFamilies)) {
+                MOZ_ASSERT(genericFamilies.Length() == 1,
+                           "expected a single family");
+                if (!prefFonts->Contains(genericFamilies[0])) {
+                    prefFonts->AppendElement(genericFamilies[0]);
+                    bool foundLang =
+                        !fcLang.IsEmpty() &&
+                        PatternHasLang(font, ToFcChar8Ptr(fcLang.get()));
+                    foundFontWithLang = foundFontWithLang || foundLang;
+                    // check to see if the list is full
+                    if (prefFonts->Length() >= limit) {
+                        break;
+                    }
+                }
+            }
+        }
+    }
+
+    // if no font in the list matches the lang, trim all but the first one
+    if (!prefFonts->IsEmpty() && !foundFontWithLang) {
+        prefFonts->TruncateLength(1);
+    }
+
+    mGenericMappings.Put(genericLang, prefFonts);
+    return prefFonts;
+}
+
+bool
+gfxFcPlatformFontList::PrefFontListsUseOnlyGenerics()
+{
+    bool prefFontsUseOnlyGenerics = true;
+    uint32_t count;
+    char** names;
+    nsresult rv = Preferences::GetRootBranch()->
+        GetChildList(kFontNamePrefix, &count, &names);
+    if (NS_SUCCEEDED(rv) && count) {
+        for (size_t i = 0; i < count; i++) {
+            // Check whether all font.name prefs map to generic keywords
+            // and that the pref name and keyword match.
+            //   Ex: font.name.serif.ar ==> "serif" (ok)
+            //   Ex: font.name.serif.ar ==> "monospace" (return false)
+            //   Ex: font.name.serif.ar ==> "DejaVu Serif" (return false)
+
+            nsDependentCString prefName(names[i] +
+                                        ArrayLength(kFontNamePrefix) - 1);
+            nsCCharSeparatedTokenizer tokenizer(prefName, '.');
+            const nsDependentCSubstring& generic = tokenizer.nextToken();
+            const nsDependentCSubstring& langGroup = tokenizer.nextToken();
+            nsAdoptingCString fontPrefValue = Preferences::GetCString(names[i]);
+
+            if (!langGroup.EqualsLiteral("x-math") &&
+                !generic.Equals(fontPrefValue)) {
+                prefFontsUseOnlyGenerics = false;
+                break;
+            }
+        }
+        NS_FREE_XPCOM_ALLOCATED_POINTER_ARRAY(count, names);
+    }
+    return prefFontsUseOnlyGenerics;
+}
+
+/* static */ void
+gfxFcPlatformFontList::CheckFontUpdates(nsITimer *aTimer, void *aThis)
+{
+    // check for font updates
+    FcInitBringUptoDate();
+
+    // update fontlist if current config changed
+    gfxFcPlatformFontList *pfl = static_cast<gfxFcPlatformFontList*>(aThis);
+    FcConfig* current = FcConfigGetCurrent();
+    if (current != pfl->GetLastConfig()) {
+        pfl->UpdateFontList();
+        pfl->ForceGlobalReflow();
+    }
+}
+
+#ifdef MOZ_BUNDLED_FONTS
+void
+gfxFcPlatformFontList::ActivateBundledFonts()
+{
+    if (!mBundledFontsInitialized) {
+        mBundledFontsInitialized = true;
+        nsCOMPtr<nsIFile> localDir;
+        nsresult rv = NS_GetSpecialDirectory(NS_GRE_DIR, getter_AddRefs(localDir));
+        if (NS_FAILED(rv)) {
+            return;
+        }
+        if (NS_FAILED(localDir->Append(NS_LITERAL_STRING("fonts")))) {
+            return;
+        }
+        bool isDir;
+        if (NS_FAILED(localDir->IsDirectory(&isDir)) || !isDir) {
+            return;
+        }
+        if (NS_FAILED(localDir->GetNativePath(mBundledFontsPath))) {
+            return;
+        }
+    }
+    if (!mBundledFontsPath.IsEmpty()) {
+        FcConfigAppFontAddDir(nullptr, ToFcChar8Ptr(mBundledFontsPath.get()));
+    }
+}
+#endif
+
+#ifdef MOZ_WIDGET_GTK
+/***************************************************************************
+ *
+ * This function must be last in the file because it uses the system cairo
+ * library.  Above this point the cairo library used is the tree cairo if
+ * MOZ_TREE_CAIRO.
+ */
+
+#if MOZ_TREE_CAIRO
+// Tree cairo symbols have different names.  Disable their activation through
+// preprocessor macros.
+#undef cairo_ft_font_options_substitute
+
+// The system cairo functions are not declared because the include paths cause
+// the gdk headers to pick up the tree cairo.h.
+extern "C" {
+NS_VISIBILITY_DEFAULT void
+cairo_ft_font_options_substitute (const cairo_font_options_t *options,
+                                  FcPattern                  *pattern);
+}
+#endif
+
+static void
+ApplyGdkScreenFontOptions(FcPattern *aPattern)
+{
+    const cairo_font_options_t *options =
+        gdk_screen_get_font_options(gdk_screen_get_default());
+
+    cairo_ft_font_options_substitute(options, aPattern);
+}
+
+#endif // MOZ_WIDGET_GTK