C++ QScreen::depth方法代码示例

/*!
    Returns the bit depth of the display.

    \sa screenHeight(), screenWidth()
*/
int QDirectPainter::screenDepth()
{
    QScreen *screen = getPrimaryScreen();
    if (!screen)
        return 0;
    return screen->depth();
}

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;
}

bool QMultiScreen::connect(const QString &displaySpec)
{
    QString dSpec = displaySpec;
    if (dSpec.startsWith(QLatin1String("Multi:"), Qt::CaseInsensitive))
        dSpec = dSpec.mid(QString::fromLatin1("Multi:").size());

    const QString displayIdSpec = QString::fromLatin1(" :%1").arg(displayId);
    if (dSpec.endsWith(displayIdSpec))
        dSpec = dSpec.left(dSpec.size() - displayIdSpec.size());

    QStringList specs = dSpec.split(QLatin1Char(' '), QString::SkipEmptyParts);
    foreach (QString spec, specs) {
        const int id = getDisplayId(spec);
        if (spec.startsWith("vnc:", Qt::CaseInsensitive)) {
            spec.append(":noDisablePainting");
        }
        const QPoint offset = filterDisplayOffset(spec);
        QScreen *s = qt_get_screen(id, spec.toLatin1().constData());
        s->setOffset(offset);
        addSubScreen(s);
    }

    QScreen *firstScreen = d_ptr->screens.at(0);
    Q_ASSERT(firstScreen);

    // XXX
    QScreen::d = firstScreen->depth();

    QScreen::lstep = 0;
    QScreen::data = 0;
    QScreen::size = 0;

    QScreen::w = d_ptr->region.boundingRect().width();
    QScreen::h = d_ptr->region.boundingRect().height();

    QScreen::dw = QScreen::w;
    QScreen::dh = QScreen::h;

    // XXX - Extend the physical size based on the first screen
    // to encompass all screens, so that code that uses the multi
    // screen to calculate dpi values will get the right numbers.
    QScreen::physWidth = firstScreen->physicalWidth() * w / firstScreen->width();
    QScreen::physHeight = firstScreen->physicalHeight() * h / firstScreen->height();

    // XXXXX
    qt_screen = this;

    return true;
}

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;
}

QImage::Format
QWSMemorySurface::preferredImageFormat(const QWidget *widget) const
{
    QScreen *screen = getScreen(widget);
    const int depth = screen->depth();
    const bool opaque = isWidgetOpaque(widget);

    if (!opaque) {
        if (depth <= 12)
            return QImage::Format_ARGB4444_Premultiplied;
        else if (depth <= 15)
            return QImage::Format_ARGB8555_Premultiplied;
        else if (depth <= 16)
            return QImage::Format_ARGB8565_Premultiplied;
        else if (depth <= 18)
            return QImage::Format_ARGB6666_Premultiplied;
        else
            return QImage::Format_ARGB32_Premultiplied;
    }

    QImage::Format format = screen->pixelFormat();
    if (format > QImage::Format_Indexed8) // ### assumes all new image formats supports a QPainter
        return format;

    if (depth <= 12)
        return QImage::Format_RGB444;
    else if (depth <= 15)
        return QImage::Format_RGB555;
    else if (depth <= 16)
        return QImage::Format_RGB16;
    else if (depth <= 18)
        return QImage::Format_RGB666;
    else if (depth <= 24)
        return QImage::Format_RGB888;
    else
        return QImage::Format_ARGB32_Premultiplied;
}