qwindowsdirectwritefontdatabase.cpp

Go to the documentation of this file.

// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qwindowsdirectwritefontdatabase_p.h"
#include "qwindowsfontenginedirectwrite_p.h"
#include "qwindowsfontdatabase_p.h"
 
#include <QtCore/qendian.h>
#include <QtCore/qfile.h>
#include <QtCore/qstringbuilder.h>
#include <QtCore/qvarlengtharray.h>
 
#include <dwrite_3.h>
#include <d2d1.h>
 
QT_BEGIN_NAMESPACE
 
// Defined in gui/text/qfontdatabase.cpp
Q_GUI_EXPORT QFontDatabase::WritingSystem qt_writing_system_for_script(int script);
 
template<typename T>
struct DirectWriteScope {
    DirectWriteScope(T *res = nullptr) : m_res(res) {}
    ~DirectWriteScope() {
        if (m_res != nullptr)
            m_res->Release();
    }
 
    T **operator&()
    {
        return &m_res;
    }
 
    T *operator->()
    {
        return m_res;
    }
 
    T *operator*() {
        return m_res;
    }
 
private:
    T *m_res;
};
 
QWindowsDirectWriteFontDatabase::QWindowsDirectWriteFontDatabase()
{
    qCDebug(lcQpaFonts) << "Creating DirectWrite database";
}
 
QWindowsDirectWriteFontDatabase::~QWindowsDirectWriteFontDatabase()
{
    for (auto it = m_populatedFonts.begin(); it != m_populatedFonts.end(); ++it)
        it.value()->Release();
}
 
QString QWindowsDirectWriteFontDatabase::localeString(IDWriteLocalizedStrings *names,
                                                      wchar_t localeName[])
{
    uint index;
    BOOL exists;
    if (SUCCEEDED(names->FindLocaleName(localeName, &index, &exists)) && exists) {
        uint length;
        if (SUCCEEDED(names->GetStringLength(index, &length)) && length > 0) {
            QVarLengthArray<wchar_t> buffer(int(length) + 1);
            if (SUCCEEDED(names->GetString(index, buffer.data(), length + 1)))
                return QString::fromWCharArray(buffer.data());
        }
    }
 
    return QString();
}
 
static QFont::Stretch fromDirectWriteStretch(DWRITE_FONT_STRETCH stretch)
{
    switch (stretch) {
    case DWRITE_FONT_STRETCH_ULTRA_CONDENSED: return QFont::UltraCondensed;
    case DWRITE_FONT_STRETCH_EXTRA_CONDENSED: return QFont::ExtraCondensed;
    case DWRITE_FONT_STRETCH_CONDENSED: return QFont::Condensed;
    case DWRITE_FONT_STRETCH_SEMI_CONDENSED: return QFont::SemiCondensed;
    case DWRITE_FONT_STRETCH_NORMAL: return QFont::Unstretched;
    case DWRITE_FONT_STRETCH_SEMI_EXPANDED: return QFont::SemiExpanded;
    case DWRITE_FONT_STRETCH_EXPANDED: return QFont::Expanded;
    case DWRITE_FONT_STRETCH_EXTRA_EXPANDED: return QFont::ExtraExpanded;
    case DWRITE_FONT_STRETCH_ULTRA_EXPANDED: return QFont::UltraExpanded;
    default: return QFont::AnyStretch;
    }
}
 
static QFont::Weight fromDirectWriteWeight(DWRITE_FONT_WEIGHT weight)
{
    return static_cast<QFont::Weight>(weight);
}
 
static QFont::Style fromDirectWriteStyle(DWRITE_FONT_STYLE style)
{
    switch (style) {
    case DWRITE_FONT_STYLE_NORMAL: return QFont::StyleNormal;
    case DWRITE_FONT_STYLE_OBLIQUE: return QFont::StyleOblique;
    case DWRITE_FONT_STYLE_ITALIC: return QFont::StyleItalic;
    default: return QFont::StyleNormal;
    }
}
 
void QWindowsDirectWriteFontDatabase::populateFamily(const QString &familyName)
{
    auto it = m_populatedFonts.find(familyName);
    if (it == m_populatedFonts.end() && m_populatedBitmapFonts.contains(familyName)) {
        qCDebug(lcQpaFonts) << "Populating bitmap font" << familyName;
        QWindowsFontDatabase::populateFamily(familyName);
        return;
    }
 
    IDWriteFontFamily *fontFamily = it != m_populatedFonts.end() ? it.value() : nullptr;
    if (fontFamily == nullptr) {
        qCWarning(lcQpaFonts) << "Cannot find" << familyName << "in list of fonts";
        return;
    }
 
    qCDebug(lcQpaFonts) << "Populate family:" << familyName;
 
    wchar_t defaultLocale[LOCALE_NAME_MAX_LENGTH];
    bool hasDefaultLocale = GetUserDefaultLocaleName(defaultLocale, LOCALE_NAME_MAX_LENGTH) != 0;
    wchar_t englishLocale[] = L"en-us";
 
    static const int SMOOTH_SCALABLE = 0xffff;
    const QString foundryName; // No such concept.
    const bool scalable = true;
    const bool antialias = false;
    const int size = SMOOTH_SCALABLE;
 
    DirectWriteScope<IDWriteFontList> matchingFonts;
    if (SUCCEEDED(fontFamily->GetMatchingFonts(DWRITE_FONT_WEIGHT_REGULAR,
                                               DWRITE_FONT_STRETCH_NORMAL,
                                               DWRITE_FONT_STYLE_NORMAL,
                                               &matchingFonts))) {
        for (uint j = 0; j < matchingFonts->GetFontCount(); ++j) {
            IDWriteFont *font;
            if (SUCCEEDED(matchingFonts->GetFont(j, &font))) {
                DirectWriteScope<IDWriteFont1> font1;
                if (!SUCCEEDED(font->QueryInterface(__uuidof(IDWriteFont1),
                                                   reinterpret_cast<void **>(&font1)))) {
                    qCWarning(lcQpaFonts) << "COM object does not support IDWriteFont1";
                    continue;
                }
 
                QString defaultLocaleFamilyName;
                QString englishLocaleFamilyName;
 
                DirectWriteScope<IDWriteFontFamily> fontFamily2;
                if (SUCCEEDED(font1->GetFontFamily(&fontFamily2))) {
                    DirectWriteScope<IDWriteLocalizedStrings> names;
                    if (SUCCEEDED(fontFamily2->GetFamilyNames(&names))) {
                        defaultLocaleFamilyName = hasDefaultLocale ? localeString(*names, defaultLocale) : QString();
                        englishLocaleFamilyName = localeString(*names, englishLocale);
                    }
                }
 
                if (defaultLocaleFamilyName.isEmpty() && englishLocaleFamilyName.isEmpty())
                    englishLocaleFamilyName = familyName;
 
                {
                    DirectWriteScope<IDWriteLocalizedStrings> names;
                    if (SUCCEEDED(font1->GetFaceNames(&names))) {
                        QString defaultLocaleStyleName = hasDefaultLocale ? localeString(*names, defaultLocale) : QString();
                        QString englishLocaleStyleName = localeString(*names, englishLocale);
 
                        QFont::Stretch stretch = fromDirectWriteStretch(font1->GetStretch());
                        QFont::Style style = fromDirectWriteStyle(font1->GetStyle());
                        QFont::Weight weight = fromDirectWriteWeight(font1->GetWeight());
                        bool fixed = font1->IsMonospacedFont();
 
                        qCDebug(lcQpaFonts) << "Family" << familyName << "has english variant" << englishLocaleStyleName << ", in default locale:" << defaultLocaleStyleName << stretch << style << weight << fixed;
 
                        DirectWriteScope<IDWriteFontFace> face;
                        if (SUCCEEDED(font->CreateFontFace(&face))) {
                            QSupportedWritingSystems writingSystems = supportedWritingSystems(*face);
 
                            if (!englishLocaleStyleName.isEmpty() || defaultLocaleStyleName.isEmpty()) {
                                qCDebug(lcQpaFonts) << "Font" << englishLocaleFamilyName << englishLocaleStyleName << "supports writing systems:" << writingSystems;
 
                                QPlatformFontDatabase::registerFont(englishLocaleFamilyName,
                                                                    englishLocaleStyleName,
                                                                    QString(),
                                                                    weight,
                                                                    style,
                                                                    stretch,
                                                                    antialias,
                                                                    scalable,
                                                                    size,
                                                                    fixed,
                                                                    writingSystems,
                                                                    new FontHandle(*face, englishLocaleFamilyName));
                            }
 
                            if (!defaultLocaleFamilyName.isEmpty() && defaultLocaleFamilyName != englishLocaleFamilyName) {
                                QPlatformFontDatabase::registerFont(defaultLocaleFamilyName,
                                                                    defaultLocaleStyleName,
                                                                    QString(),
                                                                    weight,
                                                                    style,
                                                                    stretch,
                                                                    antialias,
                                                                    scalable,
                                                                    size,
                                                                    fixed,
                                                                    writingSystems,
                                                                    new FontHandle(*face, defaultLocaleFamilyName));
                            }
                        }
                    }
                }
            }
        }
    }
}
 
QSupportedWritingSystems QWindowsDirectWriteFontDatabase::supportedWritingSystems(IDWriteFontFace *face) const
{
    QSupportedWritingSystems writingSystems;
    writingSystems.setSupported(QFontDatabase::Any);
 
    DirectWriteScope<IDWriteFontFace1> face1;
    if (SUCCEEDED(face->QueryInterface(__uuidof(IDWriteFontFace1),
                                       reinterpret_cast<void **>(&face1)))) {
        const void *tableData = nullptr;
        UINT32 tableSize;
        void *tableContext = nullptr;
        BOOL exists;
        HRESULT hr = face->TryGetFontTable(qFromBigEndian(QFont::Tag("OS/2").value()),
                                           &tableData,
                                           &tableSize,
                                           &tableContext,
                                           &exists);
        if (SUCCEEDED(hr) && exists) {
            writingSystems = QPlatformFontDatabase::writingSystemsFromOS2Table(reinterpret_cast<const char *>(tableData), tableSize);
        } else { // Fall back to checking first character of each Unicode range in font (may include too many writing systems)
            quint32 rangeCount;
            hr = face1->GetUnicodeRanges(0, nullptr, &rangeCount);
 
            if (rangeCount > 0) {
                QVarLengthArray<DWRITE_UNICODE_RANGE, QChar::ScriptCount> ranges(rangeCount);
 
                hr = face1->GetUnicodeRanges(rangeCount, ranges.data(), &rangeCount);
                if (SUCCEEDED(hr)) {
                    for (uint i = 0; i < rangeCount; ++i) {
                        QChar::Script script = QChar::script(ranges.at(i).first);
 
                        QFontDatabase::WritingSystem writingSystem = qt_writing_system_for_script(script);
 
                        if (writingSystem > QFontDatabase::Any && writingSystem < QFontDatabase::WritingSystemsCount)
                            writingSystems.setSupported(writingSystem);
                    }
                } else {
                    const QString errorString = qt_error_string(int(hr));
                    qCWarning(lcQpaFonts) << "Failed to get unicode ranges for font:" << errorString;
                }
            }
        }
    }
 
    return writingSystems;
}
 
bool QWindowsDirectWriteFontDatabase::populateFamilyAliases(const QString &missingFamily)
{
    // If the font has not been populated, it is possible this is a legacy font family supported
    // by GDI. We make an attempt at loading it via GDI and then add this face directly to the
    // database.
    if (!missingFamily.isEmpty()
        && missingFamily.size() < LF_FACESIZE
        && !m_populatedFonts.contains(missingFamily)
        && !m_populatedBitmapFonts.contains(missingFamily)) {
        qCDebug(lcQpaFonts) << "Loading unpopulated" << missingFamily << ". Trying GDI.";
 
        LOGFONT lf;
        memset(&lf, 0, sizeof(LOGFONT));
        memcpy(lf.lfFaceName, missingFamily.utf16(), missingFamily.size() * sizeof(wchar_t));
 
        HFONT hfont = CreateFontIndirect(&lf);
        if (hfont) {
            HDC dummy = GetDC(0);
            HGDIOBJ oldFont = SelectObject(dummy, hfont);
 
            DirectWriteScope<IDWriteFontFace> directWriteFontFace;
            if (SUCCEEDED(data()->directWriteGdiInterop->CreateFontFaceFromHdc(dummy, &directWriteFontFace))) {
                DirectWriteScope<IDWriteFontCollection> fontCollection;
                if (SUCCEEDED(data()->directWriteFactory->GetSystemFontCollection(&fontCollection))) {
                    DirectWriteScope<IDWriteFont> font;
                    if (SUCCEEDED(fontCollection->GetFontFromFontFace(*directWriteFontFace, &font))) {
 
                        DirectWriteScope<IDWriteFont1> font1;
                        if (SUCCEEDED(font->QueryInterface(__uuidof(IDWriteFont1),
                                                           reinterpret_cast<void **>(&font1)))) {
                            DirectWriteScope<IDWriteLocalizedStrings> names;
                            if (SUCCEEDED(font1->GetFaceNames(&names))) {
                                wchar_t englishLocale[] = L"en-us";
                                QString englishLocaleStyleName = localeString(*names, englishLocale);
 
                                QFont::Stretch stretch = fromDirectWriteStretch(font1->GetStretch());
                                QFont::Style style = fromDirectWriteStyle(font1->GetStyle());
                                QFont::Weight weight = fromDirectWriteWeight(font1->GetWeight());
                                bool fixed = font1->IsMonospacedFont();
 
                                QSupportedWritingSystems writingSystems = supportedWritingSystems(*directWriteFontFace);
 
                                qCDebug(lcQpaFonts) << "Registering legacy font family" << missingFamily;
                                QPlatformFontDatabase::registerFont(missingFamily,
                                                                    englishLocaleStyleName,
                                                                    QString(),
                                                                    weight,
                                                                    style,
                                                                    stretch,
                                                                    false,
                                                                    true,
                                                                    0xffff,
                                                                    fixed,
                                                                    writingSystems,
                                                                    new FontHandle(*directWriteFontFace, missingFamily));
 
                                SelectObject(dummy, oldFont);
                                DeleteObject(hfont);
 
                                return true;
                            }
                        }
                    }
                }
            }
 
            SelectObject(dummy, oldFont);
            DeleteObject(hfont);
        }
    }
 
    // Skip over implementation in QWindowsFontDatabase
    return QWindowsFontDatabaseBase::populateFamilyAliases(missingFamily);
}
 
QFontEngine *QWindowsDirectWriteFontDatabase::fontEngine(const QByteArray &fontData,
                                                         qreal pixelSize,
                                                         QFont::HintingPreference hintingPreference)
{
    // Skip over implementation in QWindowsFontDatabase
    return QWindowsFontDatabaseBase::fontEngine(fontData, pixelSize, hintingPreference);
}
 
QFontEngine *QWindowsDirectWriteFontDatabase::fontEngine(const QFontDef &fontDef, void *handle)
{
    const FontHandle *fontHandle = static_cast<const FontHandle *>(handle);
    IDWriteFontFace *face = fontHandle->fontFace;
    if (face == nullptr) {
        qCDebug(lcQpaFonts) << "Falling back to GDI";
        return QWindowsFontDatabase::fontEngine(fontDef, handle);
    }
 
    DWRITE_FONT_SIMULATIONS simulations = DWRITE_FONT_SIMULATIONS_NONE;
    if (fontDef.weight >= QFont::DemiBold || fontDef.style != QFont::StyleNormal) {
        DirectWriteScope<IDWriteFontFace3> face3;
        if (SUCCEEDED(face->QueryInterface(__uuidof(IDWriteFontFace3),
                                           reinterpret_cast<void **>(&face3)))) {
            if (fontDef.weight >= QFont::DemiBold && face3->GetWeight() < DWRITE_FONT_WEIGHT_DEMI_BOLD)
                simulations |= DWRITE_FONT_SIMULATIONS_BOLD;
 
            if (fontDef.style != QFont::StyleNormal && face3->GetStyle() == DWRITE_FONT_STYLE_NORMAL)
                simulations |= DWRITE_FONT_SIMULATIONS_OBLIQUE;
        }
    }
 
    DirectWriteScope<IDWriteFontFace5> newFace;
    if (!fontDef.variableAxisValues.isEmpty() || simulations != DWRITE_FONT_SIMULATIONS_NONE) {
        DirectWriteScope<IDWriteFontFace5> face5;
        if (SUCCEEDED(face->QueryInterface(__uuidof(IDWriteFontFace5),
                                           reinterpret_cast<void **>(&face5)))) {
            DirectWriteScope<IDWriteFontResource> font;
            if (SUCCEEDED(face5->GetFontResource(&font))) {
                UINT32 fontAxisCount = font->GetFontAxisCount();
                QVarLengthArray<DWRITE_FONT_AXIS_VALUE, 8> fontAxisValues(fontAxisCount);
 
                if (!fontDef.variableAxisValues.isEmpty()) {
                    if (SUCCEEDED(face5->GetFontAxisValues(fontAxisValues.data(), fontAxisCount))) {
                        for (UINT32 i = 0; i < fontAxisCount; ++i) {
                            if (auto maybeTag = QFont::Tag::fromValue(qToBigEndian<UINT32>(fontAxisValues[i].axisTag))) {
                                if (fontDef.variableAxisValues.contains(*maybeTag))
                                    fontAxisValues[i].value = fontDef.variableAxisValues.value(*maybeTag);
                            }
                        }
                    }
                }
 
                if (SUCCEEDED(font->CreateFontFace(simulations,
                                                   !fontDef.variableAxisValues.isEmpty() ? fontAxisValues.data() : nullptr,
                                                   !fontDef.variableAxisValues.isEmpty() ? fontAxisCount : 0,
                                                   &newFace))) {
                    face = *newFace;
                } else {
                    qCWarning(lcQpaFonts) << "DirectWrite: Can't create font face for variable axis values";
                }
            }
        }
    }
 
    QWindowsFontEngineDirectWrite *fontEngine = new QWindowsFontEngineDirectWrite(face, fontDef.pixelSize, data());
    fontEngine->initFontInfo(fontDef, defaultVerticalDPI());
 
    return fontEngine;
}
 
QStringList QWindowsDirectWriteFontDatabase::fallbacksForFamily(const QString &family, QFont::Style style, QFont::StyleHint styleHint, QChar::Script script) const
{
    QStringList result;
    result.append(familyForStyleHint(styleHint));
    result.append(extraTryFontsForFamily(family));
    result.append(QPlatformFontDatabase::fallbacksForFamily(family, style, styleHint, script));
 
    qCDebug(lcQpaFonts) << __FUNCTION__ << family << style << styleHint
        << script << result;
    return result;
}
 
QStringList QWindowsDirectWriteFontDatabase::addApplicationFont(const QByteArray &fontData, const QString &fileName, QFontDatabasePrivate::ApplicationFont *applicationFont)
{
    qCDebug(lcQpaFonts) << "Adding application font" << fileName;
 
    QByteArray loadedData = fontData;
    if (loadedData.isEmpty()) {
        QFile file(fileName);
        if (!file.open(QIODevice::ReadOnly)) {
            qCWarning(lcQpaFonts) << "Cannot open" << fileName << "for reading.";
            return QStringList();
        }
        loadedData = file.readAll();
    }
 
    QList<IDWriteFontFace *> faces = createDirectWriteFaces(loadedData);
    if (faces.isEmpty()) {
        qCWarning(lcQpaFonts) << "Failed to create DirectWrite face from font data. Font may be unsupported.";
        return QStringList();
    }
 
    QSet<QString> ret;
    for (int i = 0; i < faces.size(); ++i) {
        IDWriteFontFace *face = faces.at(i);
        wchar_t defaultLocale[LOCALE_NAME_MAX_LENGTH];
        bool hasDefaultLocale = GetUserDefaultLocaleName(defaultLocale, LOCALE_NAME_MAX_LENGTH) != 0;
        wchar_t englishLocale[] = L"en-us";
 
        static const int SMOOTH_SCALABLE = 0xffff;
        const bool scalable = true;
        const bool antialias = false;
        const int size = SMOOTH_SCALABLE;
 
        QSupportedWritingSystems writingSystems = supportedWritingSystems(face);
        DirectWriteScope<IDWriteFontFace3> face3;
        if (SUCCEEDED(face->QueryInterface(__uuidof(IDWriteFontFace3),
                                           reinterpret_cast<void **>(&face3)))) {
            QString defaultLocaleFamilyName;
            QString englishLocaleFamilyName;
 
            IDWriteLocalizedStrings *names = nullptr;
            if (SUCCEEDED(face3->GetFamilyNames(&names))) {
                defaultLocaleFamilyName = hasDefaultLocale ? localeString(names, defaultLocale) : QString();
                englishLocaleFamilyName = localeString(names, englishLocale);
 
                names->Release();
            }
 
            QString defaultLocaleStyleName;
            QString englishLocaleStyleName;
            if (SUCCEEDED(face3->GetFaceNames(&names))) {
                defaultLocaleStyleName = hasDefaultLocale ? localeString(names, defaultLocale) : QString();
                englishLocaleStyleName = localeString(names, englishLocale);
 
                names->Release();
            }
 
            BOOL ok;
            QString defaultLocaleGdiCompatibleFamilyName;
            QString englishLocaleGdiCompatibleFamilyName;
            if (SUCCEEDED(face3->GetInformationalStrings(DWRITE_INFORMATIONAL_STRING_WIN32_FAMILY_NAMES, &names, &ok)) && ok) {
                defaultLocaleGdiCompatibleFamilyName = hasDefaultLocale ? localeString(names, defaultLocale) : QString();
                englishLocaleGdiCompatibleFamilyName = localeString(names, englishLocale);
 
                names->Release();
            }
 
            QString defaultLocaleGdiCompatibleStyleName;
            QString englishLocaleGdiCompatibleStyleName;
            if (SUCCEEDED(face3->GetInformationalStrings(DWRITE_INFORMATIONAL_STRING_WIN32_SUBFAMILY_NAMES, &names, &ok)) && ok) {
                defaultLocaleGdiCompatibleStyleName = hasDefaultLocale ? localeString(names, defaultLocale) : QString();
                englishLocaleGdiCompatibleStyleName = localeString(names, englishLocale);
 
                names->Release();
            }
 
            QString defaultLocaleTypographicFamilyName;
            QString englishLocaleTypographicFamilyName;
            if (SUCCEEDED(face3->GetInformationalStrings(DWRITE_INFORMATIONAL_STRING_TYPOGRAPHIC_FAMILY_NAMES, &names, &ok)) && ok) {
                defaultLocaleTypographicFamilyName = hasDefaultLocale ? localeString(names, defaultLocale) : QString();
                englishLocaleTypographicFamilyName = localeString(names, englishLocale);
 
                names->Release();
            }
 
            QString defaultLocaleTypographicStyleName;
            QString englishLocaleTypographicStyleName;
            if (SUCCEEDED(face3->GetInformationalStrings(DWRITE_INFORMATIONAL_STRING_TYPOGRAPHIC_SUBFAMILY_NAMES, &names, &ok)) && ok) {
                defaultLocaleTypographicStyleName = hasDefaultLocale ? localeString(names, defaultLocale) : QString();
                englishLocaleTypographicStyleName = localeString(names, englishLocale);
 
                names->Release();
            }
 
            QFont::Stretch stretch = fromDirectWriteStretch(face3->GetStretch());
            QFont::Style style = fromDirectWriteStyle(face3->GetStyle());
            QFont::Weight weight = fromDirectWriteWeight(face3->GetWeight());
            bool fixed = face3->IsMonospacedFont();
 
            qCDebug(lcQpaFonts) << "\tFont names:" << englishLocaleFamilyName << ", " << defaultLocaleFamilyName
                                << ", style names:" << englishLocaleStyleName << ", " << defaultLocaleStyleName
                                << ", stretch:" << stretch
                                << ", style:" << style
                                << ", weight:" << weight
                                << ", fixed:" << fixed;
 
            if (!englishLocaleFamilyName.isEmpty()) {
                if (applicationFont != nullptr) {
                    QFontDatabasePrivate::ApplicationFont::Properties properties;
                    properties.style = style;
                    properties.weight = weight;
                    properties.familyName = englishLocaleFamilyName;
                    properties.styleName = englishLocaleStyleName;
                    applicationFont->properties.append(properties);
                }
 
                ret.insert(englishLocaleFamilyName);
                QPlatformFontDatabase::registerFont(englishLocaleFamilyName,
                                                    englishLocaleStyleName,
                                                    QString(),
                                                    weight,
                                                    style,
                                                    stretch,
                                                    antialias,
                                                    scalable,
                                                    size,
                                                    fixed,
                                                    writingSystems,
                                                    new FontHandle(face, englishLocaleFamilyName));
            }
 
            if (!defaultLocaleFamilyName.isEmpty() && !ret.contains(defaultLocaleFamilyName)) {
                if (applicationFont != nullptr) {
                    QFontDatabasePrivate::ApplicationFont::Properties properties;
                    properties.style = style;
                    properties.weight = weight;
                    properties.familyName = englishLocaleFamilyName;
                    properties.styleName = englishLocaleStyleName;
                    applicationFont->properties.append(properties);
                }
 
                ret.insert(defaultLocaleFamilyName);
                QPlatformFontDatabase::registerFont(defaultLocaleFamilyName,
                                                    defaultLocaleStyleName,
                                                    QString(),
                                                    weight,
                                                    style,
                                                    stretch,
                                                    antialias,
                                                    scalable,
                                                    size,
                                                    fixed,
                                                    writingSystems,
                                                    new FontHandle(face, defaultLocaleFamilyName));
            }
 
            if (!englishLocaleGdiCompatibleFamilyName.isEmpty() &&
                !ret.contains(englishLocaleGdiCompatibleFamilyName)) {
                if (applicationFont != nullptr) {
                    QFontDatabasePrivate::ApplicationFont::Properties properties;
                    properties.style = style;
                    properties.weight = weight;
                    properties.familyName = englishLocaleGdiCompatibleFamilyName;
                    applicationFont->properties.append(properties);
                }
 
                ret.insert(englishLocaleGdiCompatibleFamilyName);
                QPlatformFontDatabase::registerFont(englishLocaleGdiCompatibleFamilyName,
                                                    englishLocaleGdiCompatibleStyleName,
                                                    QString(),
                                                    weight,
                                                    style,
                                                    stretch,
                                                    antialias,
                                                    scalable,
                                                    size,
                                                    fixed,
                                                    writingSystems,
                                                    new FontHandle(face, englishLocaleGdiCompatibleFamilyName));
            }
 
            if (!defaultLocaleGdiCompatibleFamilyName.isEmpty()
                && !ret.contains(defaultLocaleGdiCompatibleFamilyName)) {
                if (applicationFont != nullptr) {
                    QFontDatabasePrivate::ApplicationFont::Properties properties;
                    properties.style = style;
                    properties.weight = weight;
                    properties.familyName = defaultLocaleGdiCompatibleFamilyName;
                    applicationFont->properties.append(properties);
                }
 
                ret.insert(defaultLocaleGdiCompatibleFamilyName);
                QPlatformFontDatabase::registerFont(defaultLocaleGdiCompatibleFamilyName,
                                                    defaultLocaleGdiCompatibleStyleName,
                                                    QString(),
                                                    weight,
                                                    style,
                                                    stretch,
                                                    antialias,
                                                    scalable,
                                                    size,
                                                    fixed,
                                                    writingSystems,
                                                    new FontHandle(face, defaultLocaleGdiCompatibleFamilyName));
            }
 
            if (!englishLocaleTypographicFamilyName.isEmpty()
                && !ret.contains(englishLocaleTypographicFamilyName)) {
                if (applicationFont != nullptr) {
                    QFontDatabasePrivate::ApplicationFont::Properties properties;
                    properties.style = style;
                    properties.weight = weight;
                    properties.familyName = englishLocaleTypographicFamilyName;
                    applicationFont->properties.append(properties);
                }
 
                ret.insert(englishLocaleTypographicFamilyName);
                QPlatformFontDatabase::registerFont(englishLocaleTypographicFamilyName,
                                                    englishLocaleTypographicStyleName,
                                                    QString(),
                                                    weight,
                                                    style,
                                                    stretch,
                                                    antialias,
                                                    scalable,
                                                    size,
                                                    fixed,
                                                    writingSystems,
                                                    new FontHandle(face, englishLocaleTypographicFamilyName));
            }
 
            if (!defaultLocaleTypographicFamilyName.isEmpty()
                && !ret.contains(defaultLocaleTypographicFamilyName)) {
                if (applicationFont != nullptr) {
                    QFontDatabasePrivate::ApplicationFont::Properties properties;
                    properties.style = style;
                    properties.weight = weight;
                    properties.familyName = defaultLocaleTypographicFamilyName;
                    applicationFont->properties.append(properties);
                }
 
                ret.insert(defaultLocaleTypographicFamilyName);
                QPlatformFontDatabase::registerFont(defaultLocaleTypographicFamilyName,
                                                    defaultLocaleTypographicStyleName,
                                                    QString(),
                                                    weight,
                                                    style,
                                                    stretch,
                                                    antialias,
                                                    scalable,
                                                    size,
                                                    fixed,
                                                    writingSystems,
                                                    new FontHandle(face, defaultLocaleTypographicFamilyName));
            }
 
        } else {
            qCWarning(lcQpaFonts) << "Unable to query IDWriteFontFace3 interface from font face.";
        }
 
        face->Release();
    }
 
    return ret.values();
}
 
bool QWindowsDirectWriteFontDatabase::isPrivateFontFamily(const QString &family) const
{
    Q_UNUSED(family);
    return false;
}
 
static int QT_WIN_CALLBACK populateBitmapFonts(const LOGFONT *logFont,
                                               const TEXTMETRIC *textmetric,
                                               DWORD type,
                                               LPARAM lparam)
{
    Q_UNUSED(textmetric);
 
    // the "@family" fonts are just the same as "family". Ignore them.
    const ENUMLOGFONTEX *f = reinterpret_cast<const ENUMLOGFONTEX *>(logFont);
    const wchar_t *faceNameW = f->elfLogFont.lfFaceName;
    if (faceNameW[0] && faceNameW[0] != L'@' && wcsncmp(faceNameW, L"WST_", 4)) {
        const QString faceName = QString::fromWCharArray(faceNameW);
        if (type & RASTER_FONTTYPE || type == 0) {
            QWindowsDirectWriteFontDatabase *db = reinterpret_cast<QWindowsDirectWriteFontDatabase *>(lparam);
            if (!db->hasPopulatedFont(faceName)) {
                db->registerFontFamily(faceName);
                db->registerBitmapFont(faceName);
            }
        }
    }
    return 1; // continue
}
 
void QWindowsDirectWriteFontDatabase::populateFontDatabase()
{
    wchar_t defaultLocale[LOCALE_NAME_MAX_LENGTH];
    bool hasDefaultLocale = GetUserDefaultLocaleName(defaultLocale, LOCALE_NAME_MAX_LENGTH) != 0;
    wchar_t englishLocale[] = L"en-us";
 
    const QString defaultFontName = defaultFont().families().constFirst();
    const QString systemDefaultFontName = systemDefaultFont().families().constFirst();
 
    DirectWriteScope<IDWriteFontCollection2> fontCollection;
    DirectWriteScope<IDWriteFactory6> factory6;
    if (FAILED(data()->directWriteFactory->QueryInterface(__uuidof(IDWriteFactory6),
                                                          reinterpret_cast<void **>(&factory6)))) {
        qCWarning(lcQpaFonts) << "Can't initialize IDWriteFactory6. Use GDI font engine instead.";
        return;
    }
 
    if (SUCCEEDED(factory6->GetSystemFontCollection(false,
                                                    DWRITE_FONT_FAMILY_MODEL_TYPOGRAPHIC,
                                                    &fontCollection))) {
        for (uint i = 0; i < fontCollection->GetFontFamilyCount(); ++i) {
            DirectWriteScope<IDWriteFontFamily2> fontFamily;
            if (SUCCEEDED(fontCollection->GetFontFamily(i, &fontFamily))) {
                QString defaultLocaleName;
                QString englishLocaleName;
 
                DirectWriteScope<IDWriteLocalizedStrings> names;
                if (SUCCEEDED(fontFamily->GetFamilyNames(&names))) {
                    if (hasDefaultLocale)
                        defaultLocaleName = localeString(*names, defaultLocale);
 
                    englishLocaleName = localeString(*names, englishLocale);
                }
 
                qCDebug(lcQpaFonts) << "Registering font, english name = " << englishLocaleName << ", name in current locale = " << defaultLocaleName;
                if (!defaultLocaleName.isEmpty()) {
                    registerFontFamily(defaultLocaleName);
                    m_populatedFonts.insert(defaultLocaleName, *fontFamily);
                    fontFamily->AddRef();
 
                    if (defaultLocaleName == defaultFontName && defaultFontName != systemDefaultFontName) {
                        qDebug(lcQpaFonts) << "Adding default font" << systemDefaultFontName << "as alternative to" << defaultLocaleName;
 
                        m_populatedFonts.insert(systemDefaultFontName, *fontFamily);
                        fontFamily->AddRef();
                    }
                }
 
                if (!englishLocaleName.isEmpty() && englishLocaleName != defaultLocaleName) {
                    registerFontFamily(englishLocaleName);
                    m_populatedFonts.insert(englishLocaleName, *fontFamily);
                    fontFamily->AddRef();
 
                    if (englishLocaleName == defaultFontName && defaultFontName != systemDefaultFontName) {
                        qDebug(lcQpaFonts) << "Adding default font" << systemDefaultFontName << "as alternative to" << englishLocaleName;
 
                        m_populatedFonts.insert(systemDefaultFontName, *fontFamily);
                        fontFamily->AddRef();
                    }
                }
            }
        }
    }
 
    // Since bitmap fonts are not supported by DirectWrite, we need to populate these as well
    {
        HDC dummy = GetDC(0);
        LOGFONT lf;
        lf.lfCharSet = DEFAULT_CHARSET;
        lf.lfFaceName[0] = 0;
        lf.lfPitchAndFamily = 0;
        EnumFontFamiliesEx(dummy, &lf, populateBitmapFonts, reinterpret_cast<intptr_t>(this), 0);
        ReleaseDC(0, dummy);
    }
}
 
QFont QWindowsDirectWriteFontDatabase::defaultFont() const
{
    return QFont(QStringLiteral("Segoe UI"));
}
 
bool QWindowsDirectWriteFontDatabase::supportsVariableApplicationFonts() const
{
    QSharedPointer<QWindowsFontEngineData> fontEngineData = data();
    DirectWriteScope<IDWriteFactory5> factory5;
    if (SUCCEEDED(fontEngineData->directWriteFactory->QueryInterface(__uuidof(IDWriteFactory5),
                                                                     reinterpret_cast<void **>(&factory5)))) {
        return true;
    }
 
    return false;
}
 
QT_END_NAMESPACE