Add dpiAwareness option to manifest and send physicial viewport size to Spout

data/stellarium.exe.manifest

@@ -41,8 +41,9 @@
         </security>
     </trustInfo>
     <asmv3:application>
-      <asmv3:windowsSettings xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">
+      <asmv3:windowsSettings>
         <ms_windowsSettings:dpiAware xmlns:ms_windowsSettings="http://schemas.microsoft.com/SMI/2005/WindowsSettings">true</ms_windowsSettings:dpiAware>
+        <ms_windowsSettings:dpiAwareness xmlns:ms_windowsSettings="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2</ms_windowsSettings:dpiAwareness>
       </asmv3:windowsSettings>
     </asmv3:application>
 </assembly>

src/StelMainView.cpp

@@ -929,8 +929,18 @@ void StelMainView::init()
 	stelApp->init(configuration);
 	//this makes sure the app knows how large the window is
 	connect(stelScene,SIGNAL(sceneRectChanged(QRectF)),stelApp,SLOT(glWindowHasBeenResized(QRectF)));
+#ifdef ENABLE_SPOUT
+	QObject::connect(stelScene, &StelGraphicsScene::sceneRectChanged, [&](const QRectF& rect)
+	{
+        stelApp->glPhysicalWindowHasBeenResized(getPhysicalSize(rect));
+	});
+#endif
+
 	//also immediately set the current values
 	stelApp->glWindowHasBeenResized(stelScene->sceneRect());
+#ifdef ENABLE_SPOUT
+	stelApp->glPhysicalWindowHasBeenResized(getPhysicalSize(stelScene->sceneRect()));
+#endif
 
 	StelActionMgr *actionMgr = stelApp->getStelActionManager();
 	actionMgr->addAction("actionSave_Screenshot_Global", N_("Miscellaneous"), N_("Save screenshot"), this, "saveScreenShot()", "Ctrl+S");
@@ -1346,6 +1356,21 @@ void StelMainView::processOpenGLdiagnosticsAndWarnings(QSettings *conf, QOpenGLC
 #endif
 }
 
+// Get physical dimensions given the virtual dimensions for the screen where this window is located.
+QRectF StelMainView::getPhysicalSize(const QRectF& virtualRect) const
+{
+	auto window = this->window();
+	if(window)
+	{
+		auto pixelRatio = window->devicePixelRatio();
+		QRectF newRect(virtualRect.x(), virtualRect.y(), virtualRect.width() * pixelRatio, virtualRect.height() * pixelRatio);
+		return newRect;
+	}
+
+	// If the platform does not support getting the QWindow backing instance of this QWidget
+	return virtualRect;
+}
+
 // Debug info about OpenGL capabilities.
 void StelMainView::dumpOpenGLdiagnostics() const
 {

src/StelMainView.hpp

@@ -301,6 +301,8 @@ private slots:
 	//! Startup diagnostics, providing test for various circumstances of bad OS/OpenGL driver combinations
 	//! to provide feedback to the user about bad OpenGL drivers.
 	void processOpenGLdiagnosticsAndWarnings(QSettings *conf, QOpenGLContext* context) const;
+	//! Get physical dimensions given the virtual dimensions for the screen where this window is located.
+	QRectF getPhysicalSize(const QRectF& virtualRect) const;
 
 	//! The StelMainView singleton
 	static StelMainView* singleton;

src/core/StelApp.cpp

@@ -1067,7 +1067,7 @@ void StelApp::draw()
 }
 
 /*************************************************************************
- Call this when the size of the GL window has changed
+ Call this when the virtual size of the GL window has changed
 *************************************************************************/
 void StelApp::glWindowHasBeenResized(const QRectF& rect)
 {
@@ -1091,6 +1091,17 @@ void StelApp::glWindowHasBeenResized(const QRectF& rect)
 #endif
 }
 
+/*************************************************************************
+ Call this when the physical size of the GL window has changed
+*************************************************************************/
+void StelApp::glPhysicalWindowHasBeenResized(const QRectF& rect)
+{
+#ifdef ENABLE_SPOUT
+	if (spoutSender)
+		spoutSender->resize(static_cast<uint>(rect.width()),static_cast<uint>(rect.height()));
+#endif
+}
+
 // Handle mouse clics
 void StelApp::handleClick(QMouseEvent* inputEvent)
 {

src/core/StelApp.hpp

@@ -264,9 +264,12 @@ class StelApp : public QObject
 	///////////////////////////////////////////////////////////////////////////
 	// Scriptable methods
 public slots:
-	//! Call this when the size of the GL window has changed.
+	//! Call this when the virtual size of the GL window has changed.
 	void glWindowHasBeenResized(const QRectF &rect);
 
+	//! Call this when the physical size of the GL window has changed.
+	void glPhysicalWindowHasBeenResized(const QRectF &rect);
+
 	//! Set flag for activating night vision mode.
 	void setVisionModeNight(bool);
 	//! Get flag for activating night vision mode.