Windows: Added a workaround for non-DPI aware windows having an incorrect scale factor when using the OpenGL renderer

modules/juce_gui_basics/native/juce_win32_Windowing.cpp

@@ -4020,6 +4020,11 @@ JUCE_API ComponentPeer* createNonRepaintingEmbeddedWindowsPeer (Component& compo
                                   (HWND) parentHWND, true);
 }
 
+JUCE_API bool shouldScaleGLWindow (void* hwnd)
+{
+    return isPerMonitorDPIAwareWindow ((HWND) hwnd);
+}
+
 JUCE_IMPLEMENT_SINGLETON (HWNDComponentPeer::WindowClassHolder)
 
 //==============================================================================

modules/juce_opengl/native/juce_OpenGL_win32.h

@@ -28,6 +28,7 @@ namespace juce
 {
 
 extern ComponentPeer* createNonRepaintingEmbeddedWindowsPeer (Component&, void* parent);
+extern bool shouldScaleGLWindow (void* hwnd);
 
 //==============================================================================
 class OpenGLContext::NativeContext
@@ -160,6 +161,14 @@ public:
     }
    #endif
 
+    double getWindowScaleFactor (const Rectangle<int>& screenBounds)
+    {
+        if (nativeWindow != nullptr && shouldScaleGLWindow (nativeWindow->getNativeHandle()))
+            return Desktop::getInstance().getDisplays().findDisplayForRect (screenBounds).scale;
+
+        return 1.0;
+    }
+
 private:
     struct DummyComponent  : public Component
     {

modules/juce_opengl/opengl/juce_OpenGLContext.cpp

@@ -280,15 +280,14 @@ public:
     {
         if (auto* peer = component.getPeer())
         {
-            lastScreenBounds = component.getTopLevelComponent()->getScreenBounds();
-
-            auto newScale = Desktop::getInstance().getDisplays().findDisplayForRect (lastScreenBounds).scale;
+           #if JUCE_WINDOWS
+            auto newScale = nativeContext->getWindowScaleFactor (component.getTopLevelComponent()->getScreenBounds());
+           #else
+            auto newScale = Desktop::getInstance().getDisplays().findDisplayForRect (component.getTopLevelComponent()->getScreenBounds()).scale;
+           #endif
 
             auto localBounds = component.getLocalBounds();
-
-            auto newArea = peer->getComponent().getLocalArea (&component, localBounds)
-                                               .withZeroOrigin()
-                             * newScale;
+            auto newArea = peer->getComponent().getLocalArea (&component, localBounds).withZeroOrigin() * newScale;
 
             if (scale != newScale || viewportArea != newArea)
             {