C++ QFontDatabase::isSmoothlyScalable方法代码示例

void tst_QFont::italicOblique()
{
    QFontDatabase fdb;

    QStringList families = fdb.families();
    if (families.isEmpty())
        return;

    QStringList::ConstIterator f_it, f_end = families.end();
    for (f_it = families.begin(); f_it != f_end; ++f_it) {

	QString family = *f_it;
	QStringList styles = fdb.styles(family);
	QVERIFY(!styles.isEmpty());
	QStringList::ConstIterator s_it, s_end = styles.end();
	for (s_it = styles.begin(); s_it != s_end; ++s_it) {
	    QString style = *s_it;

	    if (fdb.isSmoothlyScalable(family, style)) {
		if (style.contains("Oblique")) {
		    style.replace("Oblique", "Italic");
		} else if (style.contains("Italic")) {
		    style.replace("Italic", "Oblique");
		} else {
		    continue;
		}
		QFont f = fdb.font(family, style, 12);
		QVERIFY(f.italic());
	    }
	}
    }
}

QStringList _k_fontList(const QFontComboBox::FontFilters &fontFilters = QFontComboBox::AllFonts)
{
    QFontDatabase dbase;

    QStringList families;
    if (fontFilters == QFontComboBox::AllFonts) {
        families = dbase.families();
    } else {
        const QFontComboBox::FontFilters scalableMask = (QFontComboBox::ScalableFonts | QFontComboBox::NonScalableFonts);
        const QFontComboBox::FontFilters spacingMask = (QFontComboBox::ProportionalFonts | QFontComboBox::MonospacedFonts);

        foreach (const QString &family, dbase.families()) {
            if ((fontFilters & scalableMask) && (fontFilters & scalableMask) != scalableMask) {
                if (bool(fontFilters & QFontComboBox::ScalableFonts) != dbase.isSmoothlyScalable(family))
                    continue;
            }
            if ((fontFilters & spacingMask) && (fontFilters & spacingMask) != spacingMask) {
                if (bool(fontFilters & QFontComboBox::MonospacedFonts) != dbase.isFixedPitch(family))
                    continue;
            }

            families << family;
        }
    }

    families.sort();
    return families;
}

void QFontComboBoxPrivate::_q_updateModel()
{
    Q_Q(QFontComboBox);
    const int scalableMask = (QFontComboBox::ScalableFonts | QFontComboBox::NonScalableFonts);
    const int spacingMask = (QFontComboBox::ProportionalFonts | QFontComboBox::MonospacedFonts);

    QStringListModel *m = qobject_cast<QStringListModel *>(q->model());
    if (!m)
        return;
    QFontFamilyDelegate *delegate = qobject_cast<QFontFamilyDelegate *>(q->view()->itemDelegate());
    QFontDatabase::WritingSystem system = delegate ? delegate->writingSystem : QFontDatabase::Any;

    QFontDatabase fdb;
    QStringList list = fdb.families(system);
    QStringList result;

    int offset = 0;
    QFontInfo fi(currentFont);

    for (int i = 0; i < list.size(); ++i) {
        if (fdb.isPrivateFamily(list.at(i)))
            continue;

        if ((filters & scalableMask) && (filters & scalableMask) != scalableMask) {
            if (bool(filters & QFontComboBox::ScalableFonts) != fdb.isSmoothlyScalable(list.at(i)))
                continue;
        }
        if ((filters & spacingMask) && (filters & spacingMask) != spacingMask) {
            if (bool(filters & QFontComboBox::MonospacedFonts) != fdb.isFixedPitch(list.at(i)))
                continue;
        }
        result += list.at(i);
        if (list.at(i) == fi.family() || list.at(i).startsWith(fi.family() + QLatin1String(" [")))
            offset = result.count() - 1;
    }
    list = result;

    //we need to block the signals so that the model doesn't emit reset
    //this prevents the current index from changing
    //it will be updated just after this
    ///TODO: we should finda way to avoid blocking signals and have a real update of the model
    {
        const QSignalBlocker blocker(m);
        m->setStringList(list);
    }

    if (list.isEmpty()) {
        if (currentFont != QFont()) {
            currentFont = QFont();
            emit q->currentFontChanged(currentFont);
        }
    } else {
        q->setCurrentIndex(offset);
    }
}

void Font::update( QPaintDeviceMetrics* devMetrics ) const
{
    f.setFamily( fontDef.family.isEmpty() ? KHTMLFactory::defaultHTMLSettings()->stdFontName() : fontDef.family );
    f.setItalic( fontDef.italic );
    f.setWeight( fontDef.weight );

    QFontDatabase db;

    int size = fontDef.size;
    int lDpiY = kMax(devMetrics->logicalDpiY(), 96);

    // ok, now some magic to get a nice unscaled font
    // all other font properties should be set before this one!!!!
    if( !db.isSmoothlyScalable(f.family(), db.styleString(f)) )
    {
        QValueList<int> pointSizes = db.smoothSizes(f.family(), db.styleString(f));
        // lets see if we find a nice looking font, which is not too far away
        // from the requested one.
        // kdDebug(6080) << "khtml::setFontSize family = " << f.family() << " size requested=" << size << endl;

        QValueList<int>::Iterator it;
        float diff = 1; // ### 100% deviation
        float bestSize = 0;
        for( it = pointSizes.begin(); it != pointSizes.end(); ++it )
        {
            float newDiff = ((*it)*(lDpiY/72.) - float(size))/float(size);
            //kdDebug( 6080 ) << "smooth font size: " << *it << " diff=" << newDiff << endl;
            if(newDiff < 0) newDiff = -newDiff;
            if(newDiff < diff)
            {
                diff = newDiff;
                bestSize = *it;
            }
        }
        //kdDebug( 6080 ) << "best smooth font size: " << bestSize << " diff=" << diff << endl;
        if ( bestSize != 0 && diff < 0.2 ) // 20% deviation, otherwise we use a scaled font...
            size = (int)((bestSize*lDpiY) / 72);
    }

    // make sure we don't bust up X11
    size = KMAX(0, KMIN(255, size));

//       qDebug("setting font to %s, italic=%d, weight=%d, size=%d", fontDef.family.latin1(), fontDef.italic,
//    	   fontDef.weight, size );


    f.setPixelSize( size );

    fm = QFontMetrics( f );
    fontDef.hasNbsp = fm.inFont( 0xa0 );
}

void tst_QFontMetrics::metrics()
{
    QFont font;
    QFontDatabase fdb;

    // Query the QFontDatabase for a specific font, store the
    // result in family, style and size.
    QStringList families = fdb.families();
    if (families.isEmpty())
        return;

    QStringList::ConstIterator f_it, f_end = families.end();
    for (f_it = families.begin(); f_it != f_end; ++f_it) {
        const QString &family = *f_it;

        QStringList styles = fdb.styles(family);
        QStringList::ConstIterator s_it, s_end = styles.end();
        for (s_it = styles.begin(); s_it != s_end; ++s_it) {
            const QString &style = *s_it;

            if (fdb.isSmoothlyScalable(family, style)) {
                // smoothly scalable font... don't need to load every pointsize
                font = fdb.font(family, style, 12);

                QFontMetrics fontmetrics(font);
                QCOMPARE(fontmetrics.ascent() + fontmetrics.descent(),
                        fontmetrics.height());

                QCOMPARE(fontmetrics.height() + fontmetrics.leading(),
                        fontmetrics.lineSpacing());
            } else {
                QList<int> sizes = fdb.pointSizes(family, style);
                QVERIFY(!sizes.isEmpty());
                QList<int>::ConstIterator z_it, z_end = sizes.end();
                for (z_it = sizes.begin(); z_it != z_end; ++z_it) {
                    const int size = *z_it;

                    // Initialize the font, and check if it is an exact match
                    font = fdb.font(family, style, size);

                    QFontMetrics fontmetrics(font);
                    QCOMPARE(fontmetrics.ascent() + fontmetrics.descent(),
                            fontmetrics.height());
                    QCOMPARE(fontmetrics.height() + fontmetrics.leading(),
                            fontmetrics.lineSpacing());
                }
            }
        }
    }
}

void QFontComboBoxPrivate::_q_updateModel()
{
    Q_Q(QFontComboBox);
    const int scalableMask = (QFontComboBox::ScalableFonts | QFontComboBox::NonScalableFonts);
    const int spacingMask = (QFontComboBox::ProportionalFonts | QFontComboBox::MonospacedFonts);

    QStringListModel *m = qobject_cast<QStringListModel *>(q->model());
    if (!m)
        return;
    QFontFamilyDelegate *delegate = qobject_cast<QFontFamilyDelegate *>(q->view()->itemDelegate());
    QFontDatabase::WritingSystem system = delegate ? delegate->writingSystem : QFontDatabase::Any;

    QFontDatabase fdb;
    QStringList list = fdb.families(system);
    QStringList result;

    int offset = 0;
    QFontInfo fi(currentFont);

    for (int i = 0; i < list.size(); ++i) {
        if ((filters & scalableMask) && (filters & scalableMask) != scalableMask) {
            if (bool(filters & QFontComboBox::ScalableFonts) != fdb.isSmoothlyScalable(list.at(i)))
                continue;
        }
        if ((filters & spacingMask) && (filters & spacingMask) != spacingMask) {
            if (bool(filters & QFontComboBox::MonospacedFonts) != fdb.isFixedPitch(list.at(i)))
                continue;
        }
        result += list.at(i);
        if (list.at(i) == fi.family() || list.at(i).startsWith(fi.family() + QLatin1String(" [")))
            offset = result.count() - 1;
    }
    list = result;

    m->setStringList(list);
    if (list.isEmpty()) {
        if (currentFont != QFont()) {
            currentFont = QFont();
            emit q->currentFontChanged(currentFont);
        }
    } else {
        q->setCurrentIndex(offset);
    }
}

void tst_QFont::exactMatch()
{
    QFont font;

    // Check if a non-existing font hasn't an exact match
    font = QFont( "BogusFont", 33 );
    QVERIFY( !font.exactMatch() );

#ifdef Q_OS_WIN
    QSKIP("Exact matching on windows misses a lot because of the sample chars");
#endif


    if (QGuiApplication::platformName() == QLatin1String("xcb")) {
        QVERIFY(QFont("sans").exactMatch());
        QVERIFY(QFont("sans-serif").exactMatch());
        QVERIFY(QFont("serif").exactMatch());
        QVERIFY(QFont("monospace").exactMatch());
    }

    QSKIP("This test is bogus on Unix with support for font aliases in fontconfig");

    QFontDatabase fdb;

    QList<QFontDatabase::WritingSystem> systems = fdb.writingSystems();
    for (int system = 0; system < systems.count(); ++system) {
        QStringList families = fdb.families(systems[system]);
        if (families.isEmpty())
            return;

        QStringList::ConstIterator f_it, f_end = families.end();
        for (f_it = families.begin(); f_it != f_end; ++f_it) {
            const QString &family = *f_it;
            if (family.contains('['))
                continue;

            QStringList styles = fdb.styles(family);
            QVERIFY(!styles.isEmpty());
            QStringList::ConstIterator s_it, s_end = styles.end();
            for (s_it = styles.begin(); s_it != s_end; ++s_it) {
                const QString &style = *s_it;

                if (fdb.isSmoothlyScalable(family, style)) {
                    // smoothly scalable font... don't need to load every pointsize
                    font = fdb.font(family, style, 12);
                    QFontInfo fontinfo(font);

                    if (! fontinfo.exactMatch()) {
                        // Unfortunately, this can fail, since
                        // QFontDatabase does not fill in all font
                        // properties.  Check to make sure that the
                        // test didn't fail for obvious reasons

                        if (fontinfo.family().isEmpty()
                                && fontinfo.pointSize() == 0) {
                            // this is a box rendering engine... this can happen from
                            // time to time, especially on X11 with iso10646-1 or
                            // unknown font encodings
                            continue;
                        }

#ifdef Q_OS_WIN
                        if (font.family().startsWith("MS ") || fontinfo.family().startsWith("MS ")) {
                            /* qDebug("Family matching skipped for MS-Alias font: %s, fontinfo: %s",
                               font.family().latin1(), fontinfo.family().latin1());
                               */
                        } else
#endif
                        {
                            if (!(font.family() == fontinfo.family()
                                        || fontinfo.family().contains(font.family())
                                        || fontinfo.family().isEmpty())) {
                                qDebug("Test about to fail for font: %s, fontinfo: %s",
                                        font.family().toLatin1().constData(),
                                        fontinfo.family().toLatin1().constData());
                            }
                            QVERIFY(font.family() == fontinfo.family()
                                    || fontinfo.family().contains(font.family())
                                    || fontinfo.family().isEmpty());
                        }
                        if (font.pointSize() != -1) {
                            QVERIFY(font.pointSize() == fontinfo.pointSize());
                        } else {
                            QVERIFY(font.pixelSize() == fontinfo.pixelSize());
                        }
                        QVERIFY(font.italic() == fontinfo.italic());
                        if (font.weight() != fontinfo.weight()) {
                            qDebug("font is %s", font.toString().toLatin1().constData());
                        }
                        QVERIFY(font.weight() == fontinfo.weight());
                    } else {
                        font.setFixedPitch(!fontinfo.fixedPitch());
                        QFontInfo fontinfo1(font);
                        QVERIFY( !fontinfo1.exactMatch() );

                        font.setFixedPitch(fontinfo.fixedPitch());
                        QFontInfo fontinfo2(font);
                        QVERIFY( fontinfo2.exactMatch() );
                    }
                }
//.........这里部分代码省略.........

void QFontDialogPrivate::updateFamilies()
{
    Q_Q(QFontDialog);

    enum match_t { MATCH_NONE = 0, MATCH_LAST_RESORT = 1, MATCH_APP = 2, MATCH_FAMILY = 3 };

    const QFontDialog::FontDialogOptions scalableMask = (QFontDialog::ScalableFonts | QFontDialog::NonScalableFonts);
    const QFontDialog::FontDialogOptions spacingMask = (QFontDialog::ProportionalFonts | QFontDialog::MonospacedFonts);
    const QFontDialog::FontDialogOptions options = q->options();

    QFontDatabase fdb;

    QStringList familyNames;
    foreach (const QString &family, fdb.families(writingSystem)) {
        if (fdb.isPrivateFamily(family))
            continue;

        if ((options & scalableMask) && (options & scalableMask) != scalableMask) {
            if (bool(options & QFontDialog::ScalableFonts) != fdb.isSmoothlyScalable(family))
                continue;
        }
        if ((options & spacingMask) && (options & spacingMask) != spacingMask) {
            if (bool(options & QFontDialog::MonospacedFonts) != fdb.isFixedPitch(family))
                continue;
        }
        familyNames << family;
    }

    familyList->model()->setStringList(familyNames);

    QString foundryName1, familyName1, foundryName2, familyName2;
    int bestFamilyMatch = -1;
    match_t bestFamilyType = MATCH_NONE;

    QFont f;

    // ##### do the right thing for a list of family names in the font.
    QFontDatabase::parseFontName(family, foundryName1, familyName1);

    QStringList::const_iterator it = familyNames.constBegin();
    int i = 0;
    for(; it != familyNames.constEnd(); ++it, ++i) {
        QFontDatabase::parseFontName(*it, foundryName2, familyName2);

        //try to match...
        if (familyName1 == familyName2) {
            bestFamilyType = MATCH_FAMILY;
            if (foundryName1 == foundryName2) {
                bestFamilyMatch = i;
                break;
            }
            if (bestFamilyMatch < MATCH_FAMILY)
                bestFamilyMatch = i;
        }

        //and try some fall backs
        match_t type = MATCH_NONE;
        if (bestFamilyType <= MATCH_NONE && familyName2 == f.lastResortFamily())
            type = MATCH_LAST_RESORT;
        if (bestFamilyType <= MATCH_LAST_RESORT && familyName2 == f.family())
            type = MATCH_APP;
        // ### add fallback for writingSystem
        if (type != MATCH_NONE) {
            bestFamilyType = type;
            bestFamilyMatch = i;
        }
    }

    if (i != -1 && bestFamilyType != MATCH_NONE)
        familyList->setCurrentItem(bestFamilyMatch);
    else
        familyList->setCurrentItem(0);
    familyEdit->setText(familyList->currentText());
    if (q->style()->styleHint(QStyle::SH_FontDialog_SelectAssociatedText, 0, q)
            && familyList->hasFocus())
        familyEdit->selectAll();

    updateStyles();
}