QT: set PassThrough scaling policy for HighDpi displays

dyfer · Apr 4, 2020 · a8e4520 · a8e4520
1 parent 0492dc4
commit a8e4520
Show file tree

Hide file tree

Showing 2 changed files with 13 additions and 0 deletions.
diff --git a/QtCollider/interface.cpp b/QtCollider/interface.cpp
@@ -75,6 +75,12 @@ void QtCollider::init() {
         static char* qcArgv[1] = { qcArg0 };
 
         QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+        // In order to scale the UI properly on Windows with display scaling like 125% or 150%
+        // we need to disable scale factor rounding
+        // This is only available in Qt >= 5.14
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0))
+        QGuiApplication::setHighDpiScaleFactorRoundingPolicy(Qt::HighDpiScaleFactorRoundingPolicy::PassThrough);
+#endif // QT_VERSION
 
         QcApplication* qcApp = new QcApplication(qcArgc, qcArgv);
 

diff --git a/editors/sc-ide/core/main_function.cpp b/editors/sc-ide/core/main_function.cpp
@@ -34,6 +34,13 @@ using namespace ScIDE;
 
 int main(int argc, char* argv[]) {
     QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+    // In order to scale the UI properly on Windows with display scaling like 125% or 150%
+    // we need to disable scale factor rounding
+    // This is only available in Qt >= 5.14
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0))
+    QGuiApplication::setHighDpiScaleFactorRoundingPolicy(Qt::HighDpiScaleFactorRoundingPolicy::PassThrough);
+#endif // QT_VERSION
+
     QApplication app(argc, argv);
 
     QStringList arguments(QApplication::arguments());