qscreen.cpp

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// Copyright (C) 2016 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 "qscreen.h"
#include "qscreen_p.h"
#include "qpixmap.h"
#include "qguiapplication_p.h"
#include <qpa/qplatformscreen.h>
#include <qpa/qplatformscreen_p.h>
 
#include <QtCore/QDebug>
#include <QtCore/private/qobject_p.h>
#include "qhighdpiscaling_p.h"
 
QT_BEGIN_NAMESPACE
 
QScreen::QScreen(QPlatformScreen *platformScreen)
    : QObject(*new QScreenPrivate(), nullptr)
{
    Q_D(QScreen);
 
    d->platformScreen = platformScreen;
    platformScreen->d_func()->screen = this;
 
    d->orientation = platformScreen->orientation();
    d->logicalDpi = QPlatformScreen::overrideDpi(platformScreen->logicalDpi());
    d->refreshRate = platformScreen->refreshRate();
    // safeguard ourselves against buggy platform behavior...
    if (d->refreshRate < 1.0)
        d->refreshRate = 60.0;
 
    d->updateGeometry();
    d->updatePrimaryOrientation(); // derived from the geometry
}
 
void QScreenPrivate::updateGeometry()
{
    qreal scaleFactor = QHighDpiScaling::factor(platformScreen);
    QRect nativeGeometry = platformScreen->geometry();
    geometry = QRect(nativeGeometry.topLeft(), QHighDpi::fromNative(nativeGeometry.size(), scaleFactor));
    availableGeometry = QHighDpi::fromNative(platformScreen->availableGeometry(), scaleFactor, geometry.topLeft());
}
 
QScreen::~QScreen()
{
    Q_ASSERT_X(!QGuiApplicationPrivate::screen_list.contains(this), "QScreen",
        "QScreens should be removed via QWindowSystemInterface::handleScreenRemoved()");
}
 
QPlatformScreen *QScreen::handle() const
{
    Q_D(const QScreen);
    return d->platformScreen;
}
 
QString QScreen::name() const
{
    Q_D(const QScreen);
    return d->platformScreen->name();
}
 
QString QScreen::manufacturer() const
{
    Q_D(const QScreen);
    return d->platformScreen->manufacturer();
}
 
QString QScreen::model() const
{
    Q_D(const QScreen);
    return d->platformScreen->model();
}
 
QString QScreen::serialNumber() const
{
    Q_D(const QScreen);
    return d->platformScreen->serialNumber();
}
 
int QScreen::depth() const
{
    Q_D(const QScreen);
    return d->platformScreen->depth();
}
 
QSize QScreen::size() const
{
    Q_D(const QScreen);
    return d->geometry.size();
}
 
qreal QScreen::physicalDotsPerInchX() const
{
    return size().width() / physicalSize().width() * qreal(25.4);
}
 
qreal QScreen::physicalDotsPerInchY() const
{
    return size().height() / physicalSize().height() * qreal(25.4);
}
 
qreal QScreen::physicalDotsPerInch() const
{
    QSize sz = size();
    QSizeF psz = physicalSize();
    return ((sz.height() / psz.height()) + (sz.width() / psz.width())) * qreal(25.4 * 0.5);
}
 
qreal QScreen::logicalDotsPerInchX() const
{
    Q_D(const QScreen);
    if (QHighDpiScaling::isActive())
        return QHighDpiScaling::logicalDpi(this).first;
    return d->logicalDpi.first;
}
 
qreal QScreen::logicalDotsPerInchY() const
{
    Q_D(const QScreen);
    if (QHighDpiScaling::isActive())
        return QHighDpiScaling::logicalDpi(this).second;
    return d->logicalDpi.second;
}
 
qreal QScreen::logicalDotsPerInch() const
{
    Q_D(const QScreen);
    QDpi dpi = QHighDpiScaling::isActive() ? QHighDpiScaling::logicalDpi(this) : d->logicalDpi;
    return (dpi.first + dpi.second) * qreal(0.5);
}
 
qreal QScreen::devicePixelRatio() const
{
    Q_D(const QScreen);
    return d->platformScreen->devicePixelRatio() * QHighDpiScaling::factor(this);
}
 
QSizeF QScreen::physicalSize() const
{
    Q_D(const QScreen);
    return d->platformScreen->physicalSize();
}
 
QSize QScreen::availableSize() const
{
    Q_D(const QScreen);
    return d->availableGeometry.size();
}
 
QRect QScreen::geometry() const
{
    Q_D(const QScreen);
    return d->geometry;
}
 
QRect QScreen::availableGeometry() const
{
    Q_D(const QScreen);
    return d->availableGeometry;
}
 
QList<QScreen *> QScreen::virtualSiblings() const
{
    Q_D(const QScreen);
    const QList<QPlatformScreen *> platformScreens = d->platformScreen->virtualSiblings();
    QList<QScreen *> screens;
    screens.reserve(platformScreens.size());
    for (QPlatformScreen *platformScreen : platformScreens) {
        // Only consider platform screens that have been added
        if (auto *knownScreen = platformScreen->screen())
            screens << knownScreen;
    }
    return screens;
}
 
QSize QScreen::virtualSize() const
{
    return virtualGeometry().size();
}
 
QRect QScreen::virtualGeometry() const
{
    QRect result;
    const auto screens = virtualSiblings();
    for (QScreen *screen : screens)
        result |= screen->geometry();
    return result;
}
 
QSize QScreen::availableVirtualSize() const
{
    return availableVirtualGeometry().size();
}
 
QRect QScreen::availableVirtualGeometry() const
{
    QRect result;
    const auto screens = virtualSiblings();
    for (QScreen *screen : screens)
        result |= screen->availableGeometry();
    return result;
}
 
Qt::ScreenOrientation QScreen::orientation() const
{
    Q_D(const QScreen);
    return d->orientation;
}
 
qreal QScreen::refreshRate() const
{
    Q_D(const QScreen);
    return d->refreshRate;
}
 
Qt::ScreenOrientation QScreen::primaryOrientation() const
{
    Q_D(const QScreen);
    return d->primaryOrientation;
}
 
Qt::ScreenOrientation QScreen::nativeOrientation() const
{
    Q_D(const QScreen);
    return d->platformScreen->nativeOrientation();
}
 
int QScreen::angleBetween(Qt::ScreenOrientation a, Qt::ScreenOrientation b) const
{
    if (a == Qt::PrimaryOrientation)
        a = primaryOrientation();
 
    if (b == Qt::PrimaryOrientation)
        b = primaryOrientation();
 
    return QPlatformScreen::angleBetween(a, b);
}
 
QTransform QScreen::transformBetween(Qt::ScreenOrientation a, Qt::ScreenOrientation b, const QRect &target) const
{
    if (a == Qt::PrimaryOrientation)
        a = primaryOrientation();
 
    if (b == Qt::PrimaryOrientation)
        b = primaryOrientation();
 
    return QPlatformScreen::transformBetween(a, b, target);
}
 
QRect QScreen::mapBetween(Qt::ScreenOrientation a, Qt::ScreenOrientation b, const QRect &rect) const
{
    if (a == Qt::PrimaryOrientation)
        a = primaryOrientation();
 
    if (b == Qt::PrimaryOrientation)
        b = primaryOrientation();
 
    return QPlatformScreen::mapBetween(a, b, rect);
}
 
bool QScreen::isPortrait(Qt::ScreenOrientation o) const
{
    return o == Qt::PortraitOrientation || o == Qt::InvertedPortraitOrientation
        || (o == Qt::PrimaryOrientation && primaryOrientation() == Qt::PortraitOrientation);
}
 
bool QScreen::isLandscape(Qt::ScreenOrientation o) const
{
    return o == Qt::LandscapeOrientation || o == Qt::InvertedLandscapeOrientation
        || (o == Qt::PrimaryOrientation && primaryOrientation() == Qt::LandscapeOrientation);
}
 
void QScreenPrivate::updatePrimaryOrientation()
{
    primaryOrientation = geometry.width() >= geometry.height() ? Qt::LandscapeOrientation : Qt::PortraitOrientation;
}
 
QScreen *QScreen::virtualSiblingAt(QPoint point)
{
    const auto &siblings = virtualSiblings();
    for (QScreen *sibling : siblings) {
        if (sibling->geometry().contains(point))
            return sibling;
    }
    return nullptr;
}
 
QPixmap QScreen::grabWindow(WId window, int x, int y, int width, int height)
{
    const QPlatformScreen *platformScreen = handle();
    if (!platformScreen) {
        qWarning("invoked with handle==0");
        return QPixmap();
    }
    const qreal factor = QHighDpiScaling::factor(this);
    if (qFuzzyCompare(factor, 1))
        return platformScreen->grabWindow(window, x, y, width, height);
 
    const QPoint nativePos = QHighDpi::toNative(QPoint(x, y), factor);
    QSize nativeSize(width, height);
    if (nativeSize.isValid())
        nativeSize = QHighDpi::toNative(nativeSize, factor);
    QPixmap result =
        platformScreen->grabWindow(window, nativePos.x(), nativePos.y(),
                                   nativeSize.width(), nativeSize.height());
    result.setDevicePixelRatio(result.devicePixelRatio() * factor);
    return result;
}
 
void *QScreen::resolveInterface(const char *name, int revision) const
{
    using namespace QNativeInterface;
    using namespace QNativeInterface::Private;
 
    auto *platformScreen = handle();
    Q_UNUSED(platformScreen);
    Q_UNUSED(name);
    Q_UNUSED(revision);
 
#if QT_CONFIG(xcb)
    QT_NATIVE_INTERFACE_RETURN_IF(QXcbScreen, platformScreen);
#endif
 
#if QT_CONFIG(vsp2)
    QT_NATIVE_INTERFACE_RETURN_IF(QVsp2Screen, platformScreen);
#endif
 
#if defined(Q_OS_WEBOS)
    QT_NATIVE_INTERFACE_RETURN_IF(QWebOSScreen, platformScreen);
#endif
 
#if defined(Q_OS_WIN32)
    QT_NATIVE_INTERFACE_RETURN_IF(QWindowsScreen, platformScreen);
#endif
 
#if defined(Q_OS_ANDROID)
    QT_NATIVE_INTERFACE_RETURN_IF(QAndroidScreen, platformScreen);
#endif
 
#if QT_CONFIG(wayland)
    QT_NATIVE_INTERFACE_RETURN_IF(QWaylandScreen, platformScreen);
#endif
 
    return nullptr;
}
 
#ifndef QT_NO_DEBUG_STREAM
Q_GUI_EXPORT QDebug operator<<(QDebug debug, const QScreen *screen)
{
    const QDebugStateSaver saver(debug);
    debug.nospace();
    debug << "QScreen(" << (const void *)screen;
    if (screen) {
        debug << ", name=" << screen->name();
        if (debug.verbosity() > 2) {
            if (screen == QGuiApplication::primaryScreen())
                debug << ", primary";
            debug << ", geometry=" << screen->geometry();
            debug << ", available=" << screen->availableGeometry();
            debug << ", logical DPI=" << screen->logicalDotsPerInchX()
                << ',' << screen->logicalDotsPerInchY()
                << ", physical DPI=" << screen->physicalDotsPerInchX()
                << ',' << screen->physicalDotsPerInchY()
                << ", devicePixelRatio=" << screen->devicePixelRatio()
                << ", orientation=" << screen->orientation()
                << ", physical size=" << screen->physicalSize().width()
                << 'x' << screen->physicalSize().height() << "mm";
        }
    }
    debug << ')';
    return debug;
}
#endif // !QT_NO_DEBUG_STREAM
 
QScreenPrivate::UpdateEmitter::UpdateEmitter(QScreen *screen)
{
    initialState.platformScreen = screen->handle();
 
    // Use public APIs to read out current state, rather
    // than accessing the QScreenPrivate members, so that
    // we detect any changes to the high-DPI scale factors
    // that may be applied in the getters.
 
    initialState.logicalDpi = QDpi{
        screen->logicalDotsPerInchX(),
        screen->logicalDotsPerInchY()
    };
    initialState.geometry = screen->geometry();
    initialState.availableGeometry = screen->availableGeometry();
    initialState.primaryOrientation = screen->primaryOrientation();
}
 
QScreenPrivate::UpdateEmitter::~UpdateEmitter()
{
    QScreen *screen = initialState.platformScreen->screen();
 
    const auto logicalDotsPerInch = QDpi{
        screen->logicalDotsPerInchX(),
        screen->logicalDotsPerInchY()
    };
    if (logicalDotsPerInch != initialState.logicalDpi)
        emit screen->logicalDotsPerInchChanged(screen->logicalDotsPerInch());
 
    const auto geometry = screen->geometry();
    const auto geometryChanged = geometry != initialState.geometry;
    if (geometryChanged)
        emit screen->geometryChanged(geometry);
 
    const auto availableGeometry = screen->availableGeometry();
    const auto availableGeometryChanged = availableGeometry != initialState.availableGeometry;
    if (availableGeometryChanged)
        emit screen->availableGeometryChanged(availableGeometry);
 
    if (geometryChanged || availableGeometryChanged) {
        const auto siblings = screen->virtualSiblings();
        for (QScreen* sibling : siblings)
            emit sibling->virtualGeometryChanged(sibling->virtualGeometry());
    }
 
    if (geometryChanged) {
        emit screen->physicalDotsPerInchChanged(screen->physicalDotsPerInch());
 
        const auto primaryOrientation = screen->primaryOrientation();
        if (primaryOrientation != initialState.primaryOrientation)
            emit screen->primaryOrientationChanged(primaryOrientation);
    }
}
 
QT_END_NAMESPACE
 
#include "moc_qscreen.cpp"