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gecko/gfx/thebes/gfxFontconfigUtils.cpp

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/* -*- 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/ArrayUtils.h"
#include "gfxFontconfigUtils.h"
#include "gfxFont.h"
#include "nsGkAtoms.h"
#include <locale.h>
#include <fontconfig/fontconfig.h>
#include "nsServiceManagerUtils.h"
#include "nsILanguageAtomService.h"
#include "nsTArray.h"
#include "mozilla/Preferences.h"
#include "nsIAtom.h"
#include "nsCRT.h"
#include "gfxFontConstants.h"
#include "mozilla/gfx/2D.h"
using namespace mozilla;
/* static */ gfxFontconfigUtils* gfxFontconfigUtils::sUtils = nullptr;
static nsILanguageAtomService* gLangService = nullptr;
/* static */ void
gfxFontconfigUtils::Shutdown() {
if (sUtils) {
delete sUtils;
sUtils = nullptr;
}
NS_IF_RELEASE(gLangService);
}
/* static */ uint8_t
gfxFontconfigUtils::FcSlantToThebesStyle(int aFcSlant)
{
switch (aFcSlant) {
case FC_SLANT_ITALIC:
return NS_FONT_STYLE_ITALIC;
case FC_SLANT_OBLIQUE:
return NS_FONT_STYLE_OBLIQUE;
default:
return NS_FONT_STYLE_NORMAL;
}
}
/* static */ uint8_t
gfxFontconfigUtils::GetThebesStyle(FcPattern *aPattern)
{
int slant;
if (FcPatternGetInteger(aPattern, FC_SLANT, 0, &slant) != FcResultMatch) {
return NS_FONT_STYLE_NORMAL;
}
return FcSlantToThebesStyle(slant);
}
/* static */ int
gfxFontconfigUtils::GetFcSlant(const gfxFontStyle& aFontStyle)
{
if (aFontStyle.style == NS_FONT_STYLE_ITALIC)
return FC_SLANT_ITALIC;
if (aFontStyle.style == NS_FONT_STYLE_OBLIQUE)
return FC_SLANT_OBLIQUE;
return FC_SLANT_ROMAN;
}
// OS/2 weight classes were introduced in fontconfig-2.1.93 (2003).
#ifndef FC_WEIGHT_THIN
#define FC_WEIGHT_THIN 0 // 2.1.93
#define FC_WEIGHT_EXTRALIGHT 40 // 2.1.93
#define FC_WEIGHT_REGULAR 80 // 2.1.93
#define FC_WEIGHT_EXTRABOLD 205 // 2.1.93
#endif
// book was introduced in fontconfig-2.2.90 (and so fontconfig-2.3.0 in 2005)
#ifndef FC_WEIGHT_BOOK
#define FC_WEIGHT_BOOK 75
#endif
// extra black was introduced in fontconfig-2.4.91 (2007)
#ifndef FC_WEIGHT_EXTRABLACK
#define FC_WEIGHT_EXTRABLACK 215
#endif
/* static */ uint16_t
gfxFontconfigUtils::GetThebesWeight(FcPattern *aPattern)
{
int weight;
if (FcPatternGetInteger(aPattern, FC_WEIGHT, 0, &weight) != FcResultMatch)
return NS_FONT_WEIGHT_NORMAL;
if (weight <= (FC_WEIGHT_THIN + FC_WEIGHT_EXTRALIGHT) / 2)
return 100;
if (weight <= (FC_WEIGHT_EXTRALIGHT + FC_WEIGHT_LIGHT) / 2)
return 200;
if (weight <= (FC_WEIGHT_LIGHT + FC_WEIGHT_BOOK) / 2)
return 300;
if (weight <= (FC_WEIGHT_REGULAR + FC_WEIGHT_MEDIUM) / 2)
// This includes FC_WEIGHT_BOOK
return 400;
if (weight <= (FC_WEIGHT_MEDIUM + FC_WEIGHT_DEMIBOLD) / 2)
return 500;
if (weight <= (FC_WEIGHT_DEMIBOLD + FC_WEIGHT_BOLD) / 2)
return 600;
if (weight <= (FC_WEIGHT_BOLD + FC_WEIGHT_EXTRABOLD) / 2)
return 700;
if (weight <= (FC_WEIGHT_EXTRABOLD + FC_WEIGHT_BLACK) / 2)
return 800;
if (weight <= FC_WEIGHT_BLACK)
return 900;
// including FC_WEIGHT_EXTRABLACK
return 901;
}
/* static */ int
gfxFontconfigUtils::FcWeightForBaseWeight(int8_t aBaseWeight)
{
NS_PRECONDITION(aBaseWeight >= 0 && aBaseWeight <= 10,
"base weight out of range");
switch (aBaseWeight) {
case 2:
return FC_WEIGHT_EXTRALIGHT;
case 3:
return FC_WEIGHT_LIGHT;
case 4:
return FC_WEIGHT_REGULAR;
case 5:
return FC_WEIGHT_MEDIUM;
case 6:
return FC_WEIGHT_DEMIBOLD;
case 7:
return FC_WEIGHT_BOLD;
case 8:
return FC_WEIGHT_EXTRABOLD;
case 9:
return FC_WEIGHT_BLACK;
}
// extremes
return aBaseWeight < 2 ? FC_WEIGHT_THIN : FC_WEIGHT_EXTRABLACK;
}
/* static */ int16_t
gfxFontconfigUtils::GetThebesStretch(FcPattern *aPattern)
{
int width;
if (FcPatternGetInteger(aPattern, FC_WIDTH, 0, &width) != FcResultMatch) {
return NS_FONT_STRETCH_NORMAL;
}
if (width <= (FC_WIDTH_ULTRACONDENSED + FC_WIDTH_EXTRACONDENSED) / 2) {
return NS_FONT_STRETCH_ULTRA_CONDENSED;
}
if (width <= (FC_WIDTH_EXTRACONDENSED + FC_WIDTH_CONDENSED) / 2) {
return NS_FONT_STRETCH_EXTRA_CONDENSED;
}
if (width <= (FC_WIDTH_CONDENSED + FC_WIDTH_SEMICONDENSED) / 2) {
return NS_FONT_STRETCH_CONDENSED;
}
if (width <= (FC_WIDTH_SEMICONDENSED + FC_WIDTH_NORMAL) / 2) {
return NS_FONT_STRETCH_SEMI_CONDENSED;
}
if (width <= (FC_WIDTH_NORMAL + FC_WIDTH_SEMIEXPANDED) / 2) {
return NS_FONT_STRETCH_NORMAL;
}
if (width <= (FC_WIDTH_SEMIEXPANDED + FC_WIDTH_EXPANDED) / 2) {
return NS_FONT_STRETCH_SEMI_EXPANDED;
}
if (width <= (FC_WIDTH_EXPANDED + FC_WIDTH_EXTRAEXPANDED) / 2) {
return NS_FONT_STRETCH_EXPANDED;
}
if (width <= (FC_WIDTH_EXTRAEXPANDED + FC_WIDTH_ULTRAEXPANDED) / 2) {
return NS_FONT_STRETCH_EXTRA_EXPANDED;
}
return NS_FONT_STRETCH_ULTRA_EXPANDED;
}
/* static */ int
gfxFontconfigUtils::FcWidthForThebesStretch(int16_t aStretch)
{
switch (aStretch) {
default: // this will catch "normal" (0) as well as out-of-range values
return FC_WIDTH_NORMAL;
case NS_FONT_STRETCH_ULTRA_CONDENSED:
return FC_WIDTH_ULTRACONDENSED;
case NS_FONT_STRETCH_EXTRA_CONDENSED:
return FC_WIDTH_EXTRACONDENSED;
case NS_FONT_STRETCH_CONDENSED:
return FC_WIDTH_CONDENSED;
case NS_FONT_STRETCH_SEMI_CONDENSED:
return FC_WIDTH_SEMICONDENSED;
case NS_FONT_STRETCH_SEMI_EXPANDED:
return FC_WIDTH_SEMIEXPANDED;
case NS_FONT_STRETCH_EXPANDED:
return FC_WIDTH_EXPANDED;
case NS_FONT_STRETCH_EXTRA_EXPANDED:
return FC_WIDTH_EXTRAEXPANDED;
case NS_FONT_STRETCH_ULTRA_EXPANDED:
return FC_WIDTH_ULTRAEXPANDED;
}
}
// This makes a guess at an FC_WEIGHT corresponding to a base weight and
// offset (without any knowledge of which weights are available).
/* static */ int
GuessFcWeight(const gfxFontStyle& aFontStyle)
{
/*
* weights come in two parts crammed into one
* integer -- the "base" weight is weight / 100,
* the rest of the value is the "offset" from that
* weight -- the number of steps to move to adjust
* the weight in the list of supported font weights,
* this value can be negative or positive.
*/
int8_t weight = aFontStyle.ComputeWeight();
// ComputeWeight trimmed the range of weights for us
NS_ASSERTION(weight >= 0 && weight <= 10,
"base weight out of range");
return gfxFontconfigUtils::FcWeightForBaseWeight(weight);
}
static void
AddString(FcPattern *aPattern, const char *object, const char *aString)
{
FcPatternAddString(aPattern, object,
gfxFontconfigUtils::ToFcChar8(aString));
}
static void
AddWeakString(FcPattern *aPattern, const char *object, const char *aString)
{
FcValue value;
value.type = FcTypeString;
value.u.s = gfxFontconfigUtils::ToFcChar8(aString);
FcPatternAddWeak(aPattern, object, value, FcTrue);
}
static void
AddLangGroup(FcPattern *aPattern, nsIAtom *aLangGroup)
{
// Translate from mozilla's internal mapping into fontconfig's
nsAutoCString lang;
gfxFontconfigUtils::GetSampleLangForGroup(aLangGroup, &lang);
if (!lang.IsEmpty()) {
AddString(aPattern, FC_LANG, lang.get());
}
}
nsReturnRef<FcPattern>
gfxFontconfigUtils::NewPattern(const nsTArray<nsString>& aFamilies,
const gfxFontStyle& aFontStyle,
const char *aLang)
{
static const char* sFontconfigGenerics[] =
{ "sans-serif", "serif", "monospace", "fantasy", "cursive" };
nsAutoRef<FcPattern> pattern(FcPatternCreate());
if (!pattern)
return nsReturnRef<FcPattern>();
FcPatternAddDouble(pattern, FC_PIXEL_SIZE, aFontStyle.size);
FcPatternAddInteger(pattern, FC_SLANT, GetFcSlant(aFontStyle));
FcPatternAddInteger(pattern, FC_WEIGHT, GuessFcWeight(aFontStyle));
FcPatternAddInteger(pattern, FC_WIDTH, FcWidthForThebesStretch(aFontStyle.stretch));
if (aLang) {
AddString(pattern, FC_LANG, aLang);
}
bool useWeakBinding = false;
for (uint32_t i = 0; i < aFamilies.Length(); ++i) {
NS_ConvertUTF16toUTF8 family(aFamilies[i]);
if (!useWeakBinding) {
AddString(pattern, FC_FAMILY, family.get());
// fontconfig generic families are typically implemented with weak
// aliases (so that the preferred font depends on language).
// However, this would give them lower priority than subsequent
// non-generic families in the list. To ensure that subsequent
// families do not have a higher priority, they are given weak
// bindings.
for (uint32_t g = 0;
g < ArrayLength(sFontconfigGenerics);
++g) {
if (0 == FcStrCmpIgnoreCase(ToFcChar8(sFontconfigGenerics[g]),
ToFcChar8(family.get()))) {
useWeakBinding = true;
break;
}
}
} else {
AddWeakString(pattern, FC_FAMILY, family.get());
}
}
return pattern.out();
}
gfxFontconfigUtils::gfxFontconfigUtils()
: mFontsByFamily(50)
, mFontsByFullname(50)
, mLangSupportTable(50)
, mLastConfig(nullptr)
{
UpdateFontListInternal();
}
nsresult
gfxFontconfigUtils::GetFontList(nsIAtom *aLangGroup,
const nsACString& aGenericFamily,
nsTArray<nsString>& aListOfFonts)
{
aListOfFonts.Clear();
nsTArray<nsCString> fonts;
nsresult rv = GetFontListInternal(fonts, aLangGroup);
if (NS_FAILED(rv))
return rv;
for (uint32_t i = 0; i < fonts.Length(); ++i) {
aListOfFonts.AppendElement(NS_ConvertUTF8toUTF16(fonts[i]));
}
aListOfFonts.Sort();
int32_t serif = 0, sansSerif = 0, monospace = 0;
// Fontconfig supports 3 generic fonts, "serif", "sans-serif", and
// "monospace", slightly different from CSS's 5.
if (aGenericFamily.IsEmpty())
serif = sansSerif = monospace = 1;
else if (aGenericFamily.LowerCaseEqualsLiteral("serif"))
serif = 1;
else if (aGenericFamily.LowerCaseEqualsLiteral("sans-serif"))
sansSerif = 1;
else if (aGenericFamily.LowerCaseEqualsLiteral("monospace"))
monospace = 1;
else if (aGenericFamily.LowerCaseEqualsLiteral("cursive") ||
aGenericFamily.LowerCaseEqualsLiteral("fantasy"))
serif = sansSerif = 1;
else
NS_NOTREACHED("unexpected CSS generic font family");
// The first in the list becomes the default in
// gFontsDialog.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"));
return NS_OK;
}
struct MozLangGroupData {
nsIAtom* const& mozLangGroup;
const char *defaultLang;
};
const MozLangGroupData MozLangGroups[] = {
{ nsGkAtoms::x_western, "en" },
{ nsGkAtoms::x_central_euro, "pl" },
{ nsGkAtoms::x_cyrillic, "ru" },
{ nsGkAtoms::x_baltic, "lv" },
{ nsGkAtoms::x_devanagari, "hi" },
{ nsGkAtoms::x_tamil, "ta" },
{ nsGkAtoms::x_armn, "hy" },
{ nsGkAtoms::x_beng, "bn" },
{ nsGkAtoms::x_cans, "iu" },
{ nsGkAtoms::x_ethi, "am" },
{ nsGkAtoms::x_geor, "ka" },
{ nsGkAtoms::x_gujr, "gu" },
{ nsGkAtoms::x_guru, "pa" },
{ nsGkAtoms::x_khmr, "km" },
{ nsGkAtoms::x_knda, "kn" },
{ nsGkAtoms::x_mlym, "ml" },
{ nsGkAtoms::x_orya, "or" },
{ nsGkAtoms::x_sinh, "si" },
{ nsGkAtoms::x_telu, "te" },
{ nsGkAtoms::x_tibt, "bo" },
{ nsGkAtoms::Unicode, 0 },
};
static bool
TryLangForGroup(const nsACString& aOSLang, nsIAtom *aLangGroup,
nsACString *aFcLang)
{
// Truncate at '.' or '@' from aOSLang, and convert '_' to '-'.
// aOSLang is in the form "language[_territory][.codeset][@modifier]".
// fontconfig takes languages in the form "language-territory".
// nsILanguageAtomService takes languages in the form language-subtag,
// where subtag may be a territory. fontconfig and nsILanguageAtomService
// handle case-conversion for us.
const char *pos, *end;
aOSLang.BeginReading(pos);
aOSLang.EndReading(end);
aFcLang->Truncate();
while (pos < end) {
switch (*pos) {
case '.':
case '@':
end = pos;
break;
case '_':
aFcLang->Append('-');
break;
default:
aFcLang->Append(*pos);
}
++pos;
}
nsIAtom *atom =
gLangService->LookupLanguage(*aFcLang);
return atom == aLangGroup;
}
/* static */ void
gfxFontconfigUtils::GetSampleLangForGroup(nsIAtom *aLangGroup,
nsACString *aFcLang)
{
NS_PRECONDITION(aFcLang != nullptr, "aFcLang must not be NULL");
const MozLangGroupData *langGroup = nullptr;
for (unsigned int i = 0; i < ArrayLength(MozLangGroups); ++i) {
if (aLangGroup == MozLangGroups[i].mozLangGroup) {
langGroup = &MozLangGroups[i];
break;
}
}
if (!langGroup) {
// Not a special mozilla language group.
// Use aLangGroup as a language code.
aLangGroup->ToUTF8String(*aFcLang);
return;
}
// Check the environment for the users preferred language that corresponds
// to this langGroup.
if (!gLangService) {
CallGetService(NS_LANGUAGEATOMSERVICE_CONTRACTID, &gLangService);
}
if (gLangService) {
const char *languages = getenv("LANGUAGE");
if (languages) {
const char separator = ':';
for (const char *pos = languages; true; ++pos) {
if (*pos == '\0' || *pos == separator) {
if (languages < pos &&
TryLangForGroup(Substring(languages, pos),
aLangGroup, aFcLang))
return;
if (*pos == '\0')
break;
languages = pos + 1;
}
}
}
const char *ctype = setlocale(LC_CTYPE, nullptr);
if (ctype &&
TryLangForGroup(nsDependentCString(ctype), aLangGroup, aFcLang))
return;
}
if (langGroup->defaultLang) {
aFcLang->Assign(langGroup->defaultLang);
} else {
aFcLang->Truncate();
}
}
nsresult
gfxFontconfigUtils::GetFontListInternal(nsTArray<nsCString>& aListOfFonts,
nsIAtom *aLangGroup)
{
FcPattern *pat = nullptr;
FcObjectSet *os = nullptr;
FcFontSet *fs = nullptr;
nsresult rv = NS_ERROR_FAILURE;
aListOfFonts.Clear();
pat = FcPatternCreate();
if (!pat)
goto end;
os = FcObjectSetBuild(FC_FAMILY, nullptr);
if (!os)
goto end;
// take the pattern and add the lang group to it
if (aLangGroup) {
AddLangGroup(pat, aLangGroup);
}
fs = FcFontList(nullptr, pat, os);
if (!fs)
goto end;
for (int i = 0; i < fs->nfont; i++) {
char *family;
if (FcPatternGetString(fs->fonts[i], FC_FAMILY, 0,
(FcChar8 **) &family) != FcResultMatch)
{
continue;
}
// Remove duplicates...
nsAutoCString strFamily(family);
if (aListOfFonts.Contains(strFamily))
continue;
aListOfFonts.AppendElement(strFamily);
}
rv = NS_OK;
end:
if (NS_FAILED(rv))
aListOfFonts.Clear();
if (pat)
FcPatternDestroy(pat);
if (os)
FcObjectSetDestroy(os);
if (fs)
FcFontSetDestroy(fs);
return rv;
}
nsresult
gfxFontconfigUtils::UpdateFontList()
{
return UpdateFontListInternal(true);
}
nsresult
gfxFontconfigUtils::UpdateFontListInternal(bool aForce)
{
if (!aForce) {
// This checks periodically according to fontconfig's configured
// <rescan> interval.
FcInitBringUptoDate();
} else if (!FcConfigUptoDate(nullptr)) { // check now with aForce
mLastConfig = nullptr;
FcInitReinitialize();
}
// FcInitReinitialize() (used by FcInitBringUptoDate) creates a new config
// before destroying the old config, so the only way that we'd miss an
// update is if fontconfig did more than one update and the memory for the
// most recent config happened to be at the same location as the original
// config.
FcConfig *currentConfig = FcConfigGetCurrent();
if (currentConfig == mLastConfig)
return NS_OK;
// This FcFontSet is owned by fontconfig
FcFontSet *fontSet = FcConfigGetFonts(currentConfig, FcSetSystem);
mFontsByFamily.Clear();
mFontsByFullname.Clear();
mLangSupportTable.Clear();
mAliasForMultiFonts.Clear();
// Record the existing font families
for (int f = 0; f < fontSet->nfont; ++f) {
FcPattern *font = fontSet->fonts[f];
FcChar8 *family;
for (int v = 0;
FcPatternGetString(font, FC_FAMILY, v, &family) == FcResultMatch;
++v) {
FontsByFcStrEntry *entry = mFontsByFamily.PutEntry(family);
if (entry) {
bool added = entry->AddFont(font);
if (!entry->mKey) {
// The reference to the font pattern keeps the pointer to
// string for the key valid. If adding the font failed
// then the entry must be removed.
if (added) {
entry->mKey = family;
} else {
mFontsByFamily.RawRemoveEntry(entry);
}
}
}
}
}
// XXX we don't support all alias names.
// Because if we don't check whether the given font name is alias name,
// fontconfig converts the non existing font to sans-serif.
// This is not good if the web page specifies font-family
// that has Windows font name in the first.
NS_ENSURE_TRUE(Preferences::GetRootBranch(), NS_ERROR_FAILURE);
nsAdoptingCString list = Preferences::GetCString("font.alias-list");
if (!list.IsEmpty()) {
const char kComma = ',';
const char *p, *p_end;
list.BeginReading(p);
list.EndReading(p_end);
while (p < p_end) {
while (nsCRT::IsAsciiSpace(*p)) {
if (++p == p_end)
break;
}
if (p == p_end)
break;
const char *start = p;
while (++p != p_end && *p != kComma)
/* nothing */ ;
nsAutoCString name(Substring(start, p));
name.CompressWhitespace(false, true);
mAliasForMultiFonts.AppendElement(name);
p++;
}
}
mLastConfig = currentConfig;
return NS_OK;
}
nsresult
gfxFontconfigUtils::GetStandardFamilyName(const nsAString& aFontName, nsAString& aFamilyName)
{
aFamilyName.Truncate();
// The fontconfig has generic family names in the font list.
if (aFontName.EqualsLiteral("serif") ||
aFontName.EqualsLiteral("sans-serif") ||
aFontName.EqualsLiteral("monospace")) {
aFamilyName.Assign(aFontName);
return NS_OK;
}
nsresult rv = UpdateFontListInternal();
if (NS_FAILED(rv))
return rv;
NS_ConvertUTF16toUTF8 fontname(aFontName);
// return empty string if no such family exists
if (!IsExistingFamily(fontname))
return NS_OK;
FcPattern *pat = nullptr;
FcObjectSet *os = nullptr;
FcFontSet *givenFS = nullptr;
nsTArray<nsCString> candidates;
FcFontSet *candidateFS = nullptr;
rv = NS_ERROR_FAILURE;
pat = FcPatternCreate();
if (!pat)
goto end;
FcPatternAddString(pat, FC_FAMILY, (FcChar8 *)fontname.get());
os = FcObjectSetBuild(FC_FAMILY, FC_FILE, FC_INDEX, nullptr);
if (!os)
goto end;
givenFS = FcFontList(nullptr, pat, os);
if (!givenFS)
goto end;
// The first value associated with a FC_FAMILY property is the family
// returned by GetFontList(), so use this value if appropriate.
// See if there is a font face with first family equal to the given family.
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 (fontname.Equals(first)) {
aFamilyName.Assign(aFontName);
rv = NS_OK;
goto end;
}
}
}
// See if any of the first family names represent the same set of font
// faces as the given family.
for (uint32_t j = 0; j < candidates.Length(); ++j) {
FcPatternDel(pat, FC_FAMILY);
FcPatternAddString(pat, FC_FAMILY, (FcChar8 *)candidates[j].get());
candidateFS = FcFontList(nullptr, pat, os);
if (!candidateFS)
goto end;
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);
rv = NS_OK;
goto end;
}
}
// No match found; return empty string.
rv = NS_OK;
end:
if (pat)
FcPatternDestroy(pat);
if (os)
FcObjectSetDestroy(os);
if (givenFS)
FcFontSetDestroy(givenFS);
if (candidateFS)
FcFontSetDestroy(candidateFS);
return rv;
}
nsresult
gfxFontconfigUtils::ResolveFontName(const nsAString& aFontName,
gfxPlatform::FontResolverCallback aCallback,
void *aClosure,
bool& aAborted)
{
aAborted = false;
nsresult rv = UpdateFontListInternal();
if (NS_FAILED(rv))
return rv;
NS_ConvertUTF16toUTF8 fontname(aFontName);
// Sometimes, the font has two or more names (e.g., "Sazanami Gothic" has
// Japanese localized name). We should not resolve to a single name
// because different names sometimes have different behavior. e.g., with
// the default settings of "Sazanami" on Fedora Core 5, the non-localized
// name uses anti-alias, but the localized name uses it. So, we should
// check just whether the font is existing, without resolving to regular
// name.
//
// The family names in mAliasForMultiFonts are names understood by
// fontconfig. The actual font to which they resolve depends on the
// entire match pattern. That info is not available here, but there
// will be a font so leave the resolving to the gfxFontGroup.
if (IsExistingFamily(fontname) ||
mAliasForMultiFonts.Contains(fontname, gfxIgnoreCaseCStringComparator()))
aAborted = !(*aCallback)(aFontName, aClosure);
return NS_OK;
}
bool
gfxFontconfigUtils::IsExistingFamily(const nsCString& aFamilyName)
{
return mFontsByFamily.GetEntry(ToFcChar8(aFamilyName)) != nullptr;
}
const nsTArray< nsCountedRef<FcPattern> >&
gfxFontconfigUtils::GetFontsForFamily(const FcChar8 *aFamilyName)
{
FontsByFcStrEntry *entry = mFontsByFamily.GetEntry(aFamilyName);
if (!entry)
return mEmptyPatternArray;
return entry->GetFonts();
}
// Fontconfig only provides a fullname property for fonts in formats with SFNT
// wrappers. For other font formats (including PCF and PS Type 1), a fullname
// must be generated from the family and style properties. Only the first
// family and style is checked, but that should be OK, as I don't expect
// non-SFNT fonts to have multiple families or styles.
bool
gfxFontconfigUtils::GetFullnameFromFamilyAndStyle(FcPattern *aFont,
nsACString *aFullname)
{
FcChar8 *family;
if (FcPatternGetString(aFont, FC_FAMILY, 0, &family) != FcResultMatch)
return false;
aFullname->Truncate();
aFullname->Append(ToCString(family));
FcChar8 *style;
if (FcPatternGetString(aFont, FC_STYLE, 0, &style) == FcResultMatch &&
strcmp(ToCString(style), "Regular") != 0) {
aFullname->Append(' ');
aFullname->Append(ToCString(style));
}
return true;
}
bool
gfxFontconfigUtils::FontsByFullnameEntry::KeyEquals(KeyTypePointer aKey) const
{
const FcChar8 *key = mKey;
// If mKey is nullptr, key comes from the style and family of the first
// font.
nsAutoCString fullname;
if (!key) {
NS_ASSERTION(mFonts.Length(), "No font in FontsByFullnameEntry!");
GetFullnameFromFamilyAndStyle(mFonts[0], &fullname);
key = ToFcChar8(fullname);
}
return FcStrCmpIgnoreCase(aKey, key) == 0;
}
void
gfxFontconfigUtils::AddFullnameEntries()
{
// This FcFontSet is owned by fontconfig
FcFontSet *fontSet = FcConfigGetFonts(nullptr, FcSetSystem);
// Record the existing font families
for (int f = 0; f < fontSet->nfont; ++f) {
FcPattern *font = fontSet->fonts[f];
int v = 0;
FcChar8 *fullname;
while (FcPatternGetString(font,
FC_FULLNAME, v, &fullname) == FcResultMatch) {
FontsByFullnameEntry *entry = mFontsByFullname.PutEntry(fullname);
if (entry) {
// entry always has space for one font, so the first AddFont
// will always succeed, and so the entry will always have a
// font from which to obtain the key.
bool added = entry->AddFont(font);
// The key may be nullptr either if this is the first font, or
// if the first font does not have a fullname property, and so
// the key is obtained from the font. Set the key in both
// cases. The check that AddFont succeeded is required for
// the second case.
if (!entry->mKey && added) {
entry->mKey = fullname;
}
}
++v;
}
// Fontconfig does not provide a fullname property for all fonts.
if (v == 0) {
nsAutoCString name;
if (!GetFullnameFromFamilyAndStyle(font, &name))
continue;
FontsByFullnameEntry *entry =
mFontsByFullname.PutEntry(ToFcChar8(name));
if (entry) {
entry->AddFont(font);
// Either entry->mKey has been set for a previous font or it
// remains nullptr to indicate that the key is obtained from
// the first font.
}
}
}
}
const nsTArray< nsCountedRef<FcPattern> >&
gfxFontconfigUtils::GetFontsForFullname(const FcChar8 *aFullname)
{
if (mFontsByFullname.Count() == 0) {
AddFullnameEntries();
}
FontsByFullnameEntry *entry = mFontsByFullname.GetEntry(aFullname);
if (!entry)
return mEmptyPatternArray;
return entry->GetFonts();
}
static FcLangResult
CompareLangString(const FcChar8 *aLangA, const FcChar8 *aLangB) {
FcLangResult result = FcLangDifferentLang;
for (uint32_t i = 0; ; ++i) {
FcChar8 a = FcToLower(aLangA[i]);
FcChar8 b = FcToLower(aLangB[i]);
if (a != b) {
if ((a == '\0' && b == '-') || (a == '-' && b == '\0'))
return FcLangDifferentCountry;
return result;
}
if (a == '\0')
return FcLangEqual;
if (a == '-') {
result = FcLangDifferentCountry;
}
}
}
/* static */
FcLangResult
gfxFontconfigUtils::GetLangSupport(FcPattern *aFont, const FcChar8 *aLang)
{
// When fontconfig builds a pattern for a system font, it will set a
// single LangSet property value for the font. That value may be removed
// and additional string values may be added through FcConfigSubsitute
// with FcMatchScan. Values that are neither LangSet nor string are
// considered errors in fontconfig sort and match functions.
//
// If no string nor LangSet value is found, then either the font is a
// system font and the LangSet has been removed through FcConfigSubsitute,
// or the font is a web font and its language support is unknown.
// Returning FcLangDifferentLang for these fonts ensures that this font
// will not be assumed to satisfy the language, and so language will be
// prioritized in sorting fallback fonts.
FcValue value;
FcLangResult best = FcLangDifferentLang;
for (int v = 0;
FcPatternGet(aFont, FC_LANG, v, &value) == FcResultMatch;
++v) {
FcLangResult support;
switch (value.type) {
case FcTypeLangSet:
support = FcLangSetHasLang(value.u.l, aLang);
break;
case FcTypeString:
support = CompareLangString(value.u.s, aLang);
break;
default:
// error. continue to see if there is a useful value.
continue;
}
if (support < best) { // lower is better
if (support == FcLangEqual)
return support;
best = support;
}
}
return best;
}
gfxFontconfigUtils::LangSupportEntry *
gfxFontconfigUtils::GetLangSupportEntry(const FcChar8 *aLang, bool aWithFonts)
{
// Currently any unrecognized languages from documents will be converted
// to x-unicode by nsILanguageAtomService, so there is a limit on the
// langugages that will be added here. Reconsider when/if document
// languages are passed to this routine.
LangSupportEntry *entry = mLangSupportTable.PutEntry(aLang);
if (!entry)
return nullptr;
FcLangResult best = FcLangDifferentLang;
if (!entry->IsKeyInitialized()) {
entry->InitKey(aLang);
} else {
// mSupport is already initialized.
if (!aWithFonts)
return entry;
best = entry->mSupport;
// If there is support for this language, an empty font list indicates
// that the list hasn't been initialized yet.
if (best == FcLangDifferentLang || entry->mFonts.Length() > 0)
return entry;
}
// This FcFontSet is owned by fontconfig
FcFontSet *fontSet = FcConfigGetFonts(nullptr, FcSetSystem);
nsAutoTArray<FcPattern*,100> fonts;
for (int f = 0; f < fontSet->nfont; ++f) {
FcPattern *font = fontSet->fonts[f];
FcLangResult support = GetLangSupport(font, aLang);
if (support < best) { // lower is better
best = support;
if (aWithFonts) {
fonts.Clear();
} else if (best == FcLangEqual) {
break;
}
}
// The font list in the LangSupportEntry is expected to be used only
// when no default fonts support the language. There would be a large
// number of fonts in entries for languages using Latin script but
// these do not need to be created because default fonts already
// support these languages.
if (aWithFonts && support != FcLangDifferentLang && support == best) {
fonts.AppendElement(font);
}
}
entry->mSupport = best;
if (aWithFonts) {
if (fonts.Length() != 0) {
entry->mFonts.AppendElements(fonts.Elements(), fonts.Length());
} else if (best != FcLangDifferentLang) {
// Previously there was a font that supported this language at the
// level of entry->mSupport, but it has now disappeared. At least
// entry->mSupport needs to be recalculated, but this is an
// indication that the set of installed fonts has changed, so
// update all caches.
mLastConfig = nullptr; // invalidates caches
UpdateFontListInternal(true);
return GetLangSupportEntry(aLang, aWithFonts);
}
}
return entry;
}
FcLangResult
gfxFontconfigUtils::GetBestLangSupport(const FcChar8 *aLang)
{
UpdateFontListInternal();
LangSupportEntry *entry = GetLangSupportEntry(aLang, false);
if (!entry)
return FcLangEqual;
return entry->mSupport;
}
const nsTArray< nsCountedRef<FcPattern> >&
gfxFontconfigUtils::GetFontsForLang(const FcChar8 *aLang)
{
LangSupportEntry *entry = GetLangSupportEntry(aLang, true);
if (!entry)
return mEmptyPatternArray;
return entry->mFonts;
}
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