High-DPI: Remove usages of Qt::AA_UseHighDpiPixmaps

Remove usages of Qt::AA_UseHighDpiPixmaps from examples/.
This flag is now on by default, and can't be disabled.

Task-number: QTBUG-83092
Change-Id: Ie28622f816da2fe28d4ab272d45ea20bd051d5f3
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

examples/corelib/threads/mandelbrot/main.cpp

@@ -56,7 +56,6 @@
 int main(int argc, char *argv[])
 {
     QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
-    QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
     QApplication app(argc, argv);
     MandelbrotWidget widget;
     widget.show();

examples/widgets/desktop/systray/main.cpp

@@ -59,8 +59,6 @@ int main(int argc, char *argv[])
 {
     Q_INIT_RESOURCE(systray);
 
-    QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
-
     QApplication app(argc, argv);
 
     if (!QSystemTrayIcon::isSystemTrayAvailable()) {

examples/widgets/dialogs/classwizard/main.cpp

@@ -59,8 +59,6 @@ int main(int argc, char *argv[])
 {
     Q_INIT_RESOURCE(classwizard);
 
-    QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
-
     QApplication app(argc, argv);
 
 #ifndef QT_NO_TRANSLATION

examples/widgets/dialogs/licensewizard/main.cpp

@@ -59,8 +59,6 @@ int main(int argc, char *argv[])
 {
     Q_INIT_RESOURCE(licensewizard);
 
-    QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
-
     QApplication app(argc, argv);
 
 #ifndef QT_NO_TRANSLATION

examples/widgets/dialogs/standarddialogs/main.cpp

@@ -59,7 +59,6 @@
 
 int main(int argc, char *argv[])
 {
-    QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
     QApplication app(argc, argv);
     QGuiApplication::setApplicationDisplayName(Dialog::tr("Standard Dialogs"));
 

examples/widgets/dialogs/trivialwizard/trivialwizard.cpp

@@ -123,8 +123,6 @@ QWizardPage *createConclusionPage()
 int main(int argc, char *argv[])
 //! [9] //! [11]
 {
-    QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
-
     QApplication app(argc, argv);
 
 #ifndef QT_NO_TRANSLATION

examples/widgets/gallery/main.cpp

@@ -62,7 +62,6 @@ int main(int argc, char *argv[])
     }
 
     if (useHighDpiScaling) {
-        QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
         QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
     } else {
         QCoreApplication::setAttribute(Qt::AA_DisableHighDpiScaling);

examples/widgets/mainwindows/mainwindow/main.cpp

@@ -176,7 +176,6 @@ static ParseCommandLineArgumentsResult
 int main(int argc, char **argv)
 {
     QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
-    QApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
     QApplication app(argc, argv);
     MainWindow::CustomSizeHintMap customSizeHints;
     switch (parseCustomSizeHints(QCoreApplication::arguments(), &customSizeHints)) {

examples/widgets/widgets/icons/main.cpp

@@ -64,15 +64,9 @@ int main(int argc, char *argv[])
     commandLineParser.setSingleDashWordOptionMode(QCommandLineParser::ParseAsLongOptions);
     commandLineParser.addHelpOption();
     commandLineParser.addVersionOption();
-    QCommandLineOption noHighDpiPixmapOption("no-highdpi-pixmaps",
-                                             "Disable High DPI image loading (Qt::AA_UseHighDpiPixmaps)");
-    commandLineParser.addOption(noHighDpiPixmapOption);
         commandLineParser.addPositionalArgument(MainWindow::tr("[file]"), MainWindow::tr("Icon file(s) to open."));
     commandLineParser.process(QCoreApplication::arguments());
 
-    if (!commandLineParser.isSet(noHighDpiPixmapOption))
-        QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
-
     MainWindow mainWin;
     if (!commandLineParser.positionalArguments().isEmpty())
         mainWin.loadImages(commandLineParser.positionalArguments());

examples/widgets/widgets/icons/mainwindow.cpp

@@ -320,12 +320,6 @@ void MainWindow::loadImages(const QStringList &fileNames)
     }
 }
 
-void MainWindow::useHighDpiPixmapsChanged(int checkState)
-{
-    QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps, checkState == Qt::Checked);
-    changeIcon();
-}
-
 //! [20]
 void MainWindow::removeAllImages()
 {
@@ -444,10 +438,6 @@ QWidget *MainWindow::createHighDpiIconSizeGroupBox()
     screenNameLabel = new QLabel(highDpiGroupBox);
     layout->addRow(tr("Screen:"), screenNameLabel);
     layout->addRow(tr("Device pixel ratio:"), devicePixelRatioLabel);
-    QCheckBox *highDpiPixmapsCheckBox = new QCheckBox(QLatin1String("Qt::AA_UseHighDpiPixmaps"));
-    highDpiPixmapsCheckBox->setChecked(QCoreApplication::testAttribute(Qt::AA_UseHighDpiPixmaps));
-    connect(highDpiPixmapsCheckBox, &QCheckBox::stateChanged, this, &MainWindow::useHighDpiPixmapsChanged);
-    layout->addRow(highDpiPixmapsCheckBox);
     return highDpiGroupBox;
 }
 

examples/widgets/widgets/icons/mainwindow.h

@@ -88,7 +88,6 @@ private slots:
     void addSampleImages();
     void addOtherImages();
     void removeAllImages();
-    void useHighDpiPixmapsChanged(int checkState);
     void screenChanged();
 
 private: