C++ QScreen::devicePixelRatio方法代码示例

void QQuickWebEngineViewPrivate::setDevicePixelRatio(qreal devicePixelRatio)
{
    Q_Q(QQuickWebEngineView);
    this->devicePixelRatio = devicePixelRatio;
    QScreen *screen = q->window() ? q->window()->screen() : QGuiApplication::primaryScreen();
    m_dpiScale = devicePixelRatio / screen->devicePixelRatio();
}

int QWidget::metric(PaintDeviceMetric m) const
{
    Q_D(const QWidget);

    QScreen *screen = 0;
    if (QWidget *topLevel = window())
        if (QWindow *topLevelWindow = topLevel->windowHandle()) {
            QPlatformScreen *platformScreen = QPlatformScreen::platformScreenForWindow(topLevelWindow);
            if (platformScreen)
                screen = platformScreen->screen();
        }
    if (!screen && QGuiApplication::primaryScreen())
        screen = QGuiApplication::primaryScreen();

    if (!screen) {
        if (m == PdmDpiX || m == PdmDpiY)
              return 72;
        return QPaintDevice::metric(m);
    }
    int val;
    if (m == PdmWidth) {
        val = data->crect.width();
    } else if (m == PdmWidthMM) {
        val = data->crect.width() * screen->physicalSize().width() / screen->geometry().width();
    } else if (m == PdmHeight) {
        val = data->crect.height();
    } else if (m == PdmHeightMM) {
        val = data->crect.height() * screen->physicalSize().height() / screen->geometry().height();
    } else if (m == PdmDepth) {
        return screen->depth();
    } else if (m == PdmDpiX) {
        if (d->extra && d->extra->customDpiX)
            return d->extra->customDpiX;
        else if (d->parent)
            return static_cast<QWidget *>(d->parent)->metric(m);
        return qRound(screen->logicalDotsPerInchX());
    } else if (m == PdmDpiY) {
        if (d->extra && d->extra->customDpiY)
            return d->extra->customDpiY;
        else if (d->parent)
            return static_cast<QWidget *>(d->parent)->metric(m);
        return qRound(screen->logicalDotsPerInchY());
    } else if (m == PdmPhysicalDpiX) {
        return qRound(screen->physicalDotsPerInchX());
    } else if (m == PdmPhysicalDpiY) {
        return qRound(screen->physicalDotsPerInchY());
    } else if (m == PdmDevicePixelRatio) {
        return screen->devicePixelRatio();
    } else {
        val = QPaintDevice::metric(m);// XXX
    }
    return val;
}

void GetScreenInfoFromNativeWindow(QWindow* window, blink::WebScreenInfo* results)
{
    QScreen* screen = window->screen();

    blink::WebScreenInfo r;
    r.deviceScaleFactor = screen->devicePixelRatio();
    r.depthPerComponent = 8;
    r.depth = screen->depth();
    r.isMonochrome = (r.depth == 1);

    QRect screenGeometry = screen->geometry();
    r.rect = blink::WebRect(screenGeometry.x(), screenGeometry.y(), screenGeometry.width(), screenGeometry.height());
    QRect available = screen->availableGeometry();
    r.availableRect = blink::WebRect(available.x(), available.y(), available.width(), available.height());
    *results = r;
}

/*!
  \internal
 */
int QPaintDeviceWindow::metric(PaintDeviceMetric metric) const
{
    QScreen *screen = this->screen();
    if (!screen && QGuiApplication::primaryScreen())
        screen = QGuiApplication::primaryScreen();

    switch (metric) {
    case PdmWidth:
        return width();
    case PdmWidthMM:
        if (screen)
            return width() * screen->physicalSize().width() / screen->geometry().width();
        break;
    case PdmHeight:
        return height();
    case PdmHeightMM:
        if (screen)
            return height() * screen->physicalSize().height() / screen->geometry().height();
        break;
    case PdmDpiX:
        if (screen)
            return qRound(screen->logicalDotsPerInchX());
        break;
    case PdmDpiY:
        if (screen)
            return qRound(screen->logicalDotsPerInchY());
        break;
    case PdmPhysicalDpiX:
        if (screen)
            return qRound(screen->physicalDotsPerInchX());
        break;
    case PdmPhysicalDpiY:
        if (screen)
            return qRound(screen->physicalDotsPerInchY());
        break;
    case PdmDevicePixelRatio:
        if (screen)
            return screen->devicePixelRatio();
        break;
    default:
        break;
    }

    return QPaintDevice::metric(metric);
}

void UnitsAttached::screenChanged(QScreen *screen)
{
    if (screen != m_screen) {
        QScreen *oldScreen = m_screen;
        m_screen = screen;

        if (oldScreen)
            oldScreen->disconnect(this);

        if (oldScreen == nullptr || screen == nullptr ||
            screen->physicalDotsPerInch() != oldScreen->physicalDotsPerInch() ||
            screen->logicalDotsPerInch() != oldScreen->logicalDotsPerInch() ||
            screen->devicePixelRatio() != oldScreen->devicePixelRatio()) {
            updateDPI();
            emit dpChanged();
        }
    }
}

SelectAreaDialog::SelectAreaDialog() :
    rubberBand_(nullptr)
{
    setWindowFlags(Qt::Widget | Qt::FramelessWindowHint);
    setWindowState(Qt::WindowFullScreen);
    setParent(0);
    setAutoFillBackground(false);
    setAttribute(Qt::WA_NoSystemBackground, false);
    setAttribute(Qt::WA_TranslucentBackground, true);
    setAttribute(Qt::WA_PaintOnScreen);
    grabMouse();
    rubberBand_ = new QRubberBand(QRubberBand::Rectangle, this);
    QApplication::setOverrideCursor(Qt::CrossCursor);
    QScreen* screen = QGuiApplication::primaryScreen();
    if (screen) {
        originalPixmap_ = screen->grabWindow(0);
        originalPixmap_.setDevicePixelRatio(screen->devicePixelRatio());
    }
}

int main(int argc, char *argv[])
{
    QOptions options(get_common_options());
    options.add(QLatin1String("QMLPlayer options"))
            ("scale", 1.0, QLatin1String("scale of graphics context. 0: auto"))
            ;
    options.parse(argc, argv);
    if (options.value(QLatin1String("help")).toBool()) {
        options.print();
        return 0;
    }

    QGuiApplication app(argc, argv);
    QDir::setCurrent(qApp->applicationDirPath());
    qDebug() << "arguments======= " << app.arguments();
    set_opengl_backend(options.option(QStringLiteral("gl")).value().toString(), app.arguments().first());
    load_qm(QStringList() << QStringLiteral("QMLPlayer"), options.value(QStringLiteral("language")).toString());
    QtQuick2ApplicationViewer viewer;
    QString binDir = qApp->applicationDirPath();
    if (binDir.endsWith(QLatin1String(".app/Contents/MacOS"))) {
        binDir.remove(QLatin1String(".app/Contents/MacOS"));
        binDir = binDir.left(binDir.lastIndexOf(QLatin1String("/")));
    }
    QQmlEngine *engine = viewer.engine();
    if (!engine->importPathList().contains(binDir))
        engine->addImportPath(binDir);
    qDebug() << engine->importPathList();
    engine->rootContext()->setContextProperty(QStringLiteral("PlayerConfig"), &Config::instance());
    qDebug(">>>>>>>>devicePixelRatio: %f", qApp->devicePixelRatio());
    QScreen *sc = app.primaryScreen();
    qDebug() << "dpi phy: " << sc->physicalDotsPerInch() << ", logical: " << sc->logicalDotsPerInch() << ", dpr: " << sc->devicePixelRatio()
                << "; vis rect:" << sc->virtualGeometry();
    // define a global var for js and qml
    engine->rootContext()->setContextProperty(QStringLiteral("screenPixelDensity"), qApp->primaryScreen()->physicalDotsPerInch()*qApp->primaryScreen()->devicePixelRatio());
    qreal r = sc->physicalDotsPerInch()/sc->logicalDotsPerInch();
    if (std::isinf(r) || std::isnan(r))
#if defined(Q_OS_ANDROID)
        r = 2.0;
#else
        r = 1.0;
#endif
    float sr = options.value(QStringLiteral("scale")).toFloat();
#if defined(Q_OS_ANDROID)
    sr = r;
    if (sr > 2.0)
        sr = 2.0; //FIXME
#endif
    if (qFuzzyIsNull(sr))
        sr = r;
    engine->rootContext()->setContextProperty(QStringLiteral("scaleRatio"), sr);
    QString qml = QStringLiteral("qml/QMLPlayer/main.qml");
    if (QFile(qApp->applicationDirPath() + QLatin1String("/") + qml).exists())
        qml.prepend(qApp->applicationDirPath() + QLatin1String("/"));
    else
        qml.prepend(QLatin1String("qrc:///"));
    viewer.setMainQmlFile(qml);
    viewer.show();
    QOption op = options.option(QStringLiteral("width"));
    if (op.isSet())
        viewer.setWidth(op.value().toInt());
    op = options.option(QStringLiteral("height"));
    if (op.isSet())
        viewer.setHeight(op.value().toInt());
    op = options.option(QStringLiteral("x"));
    if (op.isSet())
        viewer.setX(op.value().toInt());
    op = options.option(QStringLiteral("y"));
    if (op.isSet())
        viewer.setY(op.value().toInt());
    if (options.value(QStringLiteral("fullscreen")).toBool())
        viewer.showFullScreen();

    viewer.setTitle(QStringLiteral("QMLPlayer based on QtAV. [email protected]"));
    /*
     * find root item, then root.init(argv). so we can deal with argv in qml
     */
#if 1
    QString json = app.arguments().join(QStringLiteral("\",\""));
    json.prepend(QLatin1String("[\"")).append(QLatin1String("\"]"));
    json.replace(QLatin1String("\\"), QLatin1String("/")); //FIXME
    QMetaObject::invokeMethod(viewer.rootObject(), "init", Q_ARG(QVariant, json));
//#else
    QObject *player = viewer.rootObject()->findChild<QObject*>(QStringLiteral("player"));
    if (player) {
        AppEventFilter *ae = new AppEventFilter(player, player);
        qApp->installEventFilter(ae);
    }
    QString file;
#ifdef Q_OS_ANDROID
    file = QAndroidJniObject::callStaticObjectMethod("org.qtav.qmlplayer.QMLPlayerActivity"
                                                                              , "getUrl"
                                                                              , "()Ljava/lang/String;")
            .toString();
#endif
    if (app.arguments().size() > 1) {
        file = options.value(QStringLiteral("file")).toString();
        if (file.isEmpty()) {
            if (argc > 1 && !app.arguments().last().startsWith(QLatin1Char('-')) && !app.arguments().at(argc-2).startsWith(QLatin1Char('-')))
                file = app.arguments().last();
        }
//.........这里部分代码省略.........

int main(int argc, char *argv[])
{
    QOptions options(get_common_options());
    options.add("QMLPlayer options")
            ("scale", 1.0, "scale of graphics context. 0: auto")
            ;
    options.parse(argc, argv);
    if (options.value("help").toBool()) {
        options.print();
        return 0;
    }

    QGuiApplication app(argc, argv);
    QtQuick2ApplicationViewer viewer;
    qDebug(">>>>>>>>devicePixelRatio: %f", qApp->devicePixelRatio());
    QScreen *sc = app.primaryScreen();
    qDebug() << "dpi phy: " << sc->physicalDotsPerInch() << ", logical: " << sc->logicalDotsPerInch() << ", dpr: " << sc->devicePixelRatio()
                << "; vis rect:" << sc->virtualGeometry();
    // define a global var for js and qml
    viewer.engine()->rootContext()->setContextProperty("screenPixelDensity", qApp->primaryScreen()->physicalDotsPerInch()*qApp->primaryScreen()->devicePixelRatio());
    qreal r = sc->physicalDotsPerInch()/sc->logicalDotsPerInch();
    if (std::isinf(r) || std::isnan(r))
#if defined(Q_OS_ANDROID)
        r = 2.0;
#else
        r = 1.0;
#endif
    float sr = options.value("scale").toFloat();
    if (qFuzzyIsNull(sr))
        sr = r;
    viewer.engine()->rootContext()->setContextProperty("scaleRatio", sr);
    QString qml = "qml/QMLPlayer/main.qml";
    if (QFile(qApp->applicationDirPath() + "/" + qml).exists())
        qml.prepend(qApp->applicationDirPath() + "/");
    else
        qml.prepend("qrc:///");
    viewer.setMainQmlFile(qml);
    viewer.showExpanded();
    QOption op = options.option("width");
    if (op.isSet())
        viewer.setWidth(op.value().toInt());
    op = options.option("height");
    if (op.isSet())
        viewer.setHeight(op.value().toInt());
    op = options.option("x");
    if (op.isSet())
        viewer.setX(op.value().toInt());
    op = options.option("y");
    if (op.isSet())
        viewer.setY(op.value().toInt());
    if (options.value("fullscreen").toBool())
        viewer.showFullScreen();

    viewer.setTitle("QMLPlayer based on QtAV. [email protected]");
    /*
     * find root item, then root.init(argv). so we can deal with argv in qml
     */
#if 1
    QString json = app.arguments().join("\",\"");
    json.prepend("[\"").append("\"]");
    json.replace("\\", "/"); //FIXME
    QMetaObject::invokeMethod(viewer.rootObject(), "init", Q_ARG(QVariant, json));
//#else
    if (app.arguments().size() > 1) {
        qDebug("arguments > 1");
        QObject *player = viewer.rootObject()->findChild<QObject*>("player");
        QString file = options.value("file").toString();
        if (player && !file.isEmpty()) {
            if (QFile(file).exists())
                file.prepend("file://");
            file.replace("\\", "/"); //qurl
            QMetaObject::invokeMethod(player, "play", Q_ARG(QUrl, QUrl(file)));
        }
    }
#endif
    QObject::connect(viewer.rootObject(), SIGNAL(requestFullScreen()), &viewer, SLOT(showFullScreen()));
    QObject::connect(viewer.rootObject(), SIGNAL(requestNormalSize()), &viewer, SLOT(showNormal()));
    ScreenSaver::instance().disable(); //restore in dtor
    return app.exec();
}