qscreen.cpp

Go to the documentation of this file.

/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
 
#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 *screen)
    : QObject(*new QScreenPrivate(), nullptr)
{
    Q_D(QScreen);
    d->setPlatformScreen(screen);
}
 
void QScreenPrivate::updateGeometriesWithSignals()
{
    const QRect oldGeometry = geometry;
    const QRect oldAvailableGeometry = availableGeometry;
    updateHighDpi();
    emitGeometryChangeSignals(oldGeometry != geometry, oldAvailableGeometry != availableGeometry);
}
 
void QScreenPrivate::emitGeometryChangeSignals(bool geometryChanged, bool availableGeometryChanged)
{
    Q_Q(QScreen);
    if (geometryChanged)
        emit q->geometryChanged(geometry);
 
    if (availableGeometryChanged)
        emit q->availableGeometryChanged(availableGeometry);
 
    if (geometryChanged || availableGeometryChanged) {
        const auto siblings = q->virtualSiblings();
        for (QScreen* sibling : siblings)
            emit sibling->virtualGeometryChanged(sibling->virtualGeometry());
    }
 
    if (geometryChanged)
        emit q->physicalDotsPerInchChanged(q->physicalDotsPerInch());
}
 
void QScreenPrivate::setPlatformScreen(QPlatformScreen *screen)
{
    Q_Q(QScreen);
    platformScreen = screen;
    platformScreen->d_func()->screen = q;
    orientation = platformScreen->orientation();
 
    logicalDpi = QPlatformScreen::overrideDpi(platformScreen->logicalDpi());
 
    refreshRate = platformScreen->refreshRate();
    // safeguard ourselves against buggy platform behavior...
    if (refreshRate < 1.0)
        refreshRate = 60.0;
 
    updateHighDpi();
    updatePrimaryOrientation(); // derived from the geometry
}
 
 
QScreen::~QScreen()
{
    // Remove screen
    const bool wasPrimary = QGuiApplication::primaryScreen() == this;
    QGuiApplicationPrivate::screen_list.removeOne(this);
    QGuiApplicationPrivate::resetCachedDevicePixelRatio();
 
    if (!qGuiApp)
        return;
 
    QScreen *newPrimaryScreen = QGuiApplication::primaryScreen();
    if (wasPrimary && newPrimaryScreen)
        emit qGuiApp->primaryScreenChanged(newPrimaryScreen);
 
    // Allow clients to manage windows that are affected by the screen going
    // away, before we fall back to moving them to the primary screen.
    emit qApp->screenRemoved(this);
 
    if (QGuiApplication::closingDown())
        return;
 
    bool movingFromVirtualSibling = newPrimaryScreen
        && newPrimaryScreen->handle()->virtualSiblings().contains(handle());
 
    // Move any leftover windows to the primary screen
    const auto allWindows = QGuiApplication::allWindows();
    for (QWindow *window : allWindows) {
        if (!window->isTopLevel() || window->screen() != this)
            continue;
 
        const bool wasVisible = window->isVisible();
        window->setScreen(newPrimaryScreen);
 
        // Re-show window if moved from a virtual sibling screen. Otherwise
        // leave it up to the application developer to show the window.
        if (movingFromVirtualSibling)
            window->setVisible(wasVisible);
    }
}
 
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.count());
    for (QPlatformScreen *platformScreen : platformScreens)
        screens << platformScreen->screen();
    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::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
 
    return nullptr;
}
 
#ifndef QT_NO_DEBUG_STREAM
 
static inline void formatRect(QDebug &debug, const QRect r)
{
    debug << r.width() << 'x' << r.height()
        << Qt::forcesign << r.x() << r.y() << Qt::noforcesign;
}
 
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=";
            formatRect(debug, screen->geometry());
            debug << ", available=";
            formatRect(debug, 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
 
QT_END_NAMESPACE
 
#include "moc_qscreen.cpp"