+
+// Setup high DPI handling. This is a bit complicated, but will be default in Qt6.
+// macOS does it by itself.
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0) && !defined(Q_OS_MAC)
+#if QT_VERSION >= QT_VERSION_CHECK(5, 6, 0)
+ // Attribute Qt::AA_EnableHighDpiScaling must be set before QCoreApplication is created
+ if (getEnv("QT_ENABLE_HIGHDPI_SCALING").empty()
+ && getEnv("QT_AUTO_SCREEN_SCALE_FACTOR").empty())
+ QApplication::setAttribute(Qt::AA_EnableHighDpiScaling, true);
+#endif
+
+#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
+ // HighDPI scale factor policy must be set before QGuiApplication is created
+ if (getEnv("QT_SCALE_FACTOR_ROUNDING_POLICY").empty())
+ QApplication::setHighDpiScaleFactorRoundingPolicy(Qt::HighDpiScaleFactorRoundingPolicy::PassThrough);
+#endif
+#endif
+