Windowing: Refactor DPI-related function loading

modules/juce_gui_basics/native/juce_win32_Windowing.cpp

@@ -373,6 +373,32 @@ static EnableNonClientDPIScalingFunc           enableNonClientDPIScaling
 
 static bool hasCheckedForDPIAwareness = false;
 
+static void loadDPIAwarenessFunctions()
+{
+    setProcessDPIAware = (SetProcessDPIAwareFunc) getUser32Function ("SetProcessDPIAware");
+
+    constexpr auto shcore = "SHCore.dll";
+    LoadLibraryA (shcore);
+    const auto shcoreModule = GetModuleHandleA (shcore);
+
+    if (shcoreModule == nullptr)
+        return;
+
+    getDPIForMonitor                    = (GetDPIForMonitorFunc) GetProcAddress (shcoreModule, "GetDpiForMonitor");
+    setProcessDPIAwareness              = (SetProcessDPIAwarenessFunc) GetProcAddress (shcoreModule, "SetProcessDpiAwareness");
+
+   #if JUCE_WIN_PER_MONITOR_DPI_AWARE
+    getDPIForWindow                     = (GetDPIForWindowFunc) getUser32Function ("GetDpiForWindow");
+    getProcessDPIAwareness              = (GetProcessDPIAwarenessFunc) GetProcAddress (shcoreModule, "GetProcessDpiAwareness");
+    getWindowDPIAwarenessContext        = (GetWindowDPIAwarenessContextFunc) getUser32Function ("GetWindowDpiAwarenessContext");
+    setThreadDPIAwarenessContext        = (SetThreadDPIAwarenessContextFunc) getUser32Function ("SetThreadDpiAwarenessContext");
+    getThreadDPIAwarenessContext        = (GetThreadDPIAwarenessContextFunc) getUser32Function ("GetThreadDpiAwarenessContext");
+    getAwarenessFromDPIAwarenessContext = (GetAwarenessFromDpiAwarenessContextFunc) getUser32Function ("GetAwarenessFromDpiAwarenessContext");
+    setProcessDPIAwarenessContext       = (SetProcessDPIAwarenessContextFunc) getUser32Function ("SetProcessDpiAwarenessContext");
+    enableNonClientDPIScaling           = (EnableNonClientDPIScalingFunc) getUser32Function ("EnableNonClientDpiScaling");
+   #endif
+}
+
 static void setDPIAwareness()
 {
     if (hasCheckedForDPIAwareness)
@@ -383,45 +409,19 @@ static void setDPIAwareness()
     if (! JUCEApplicationBase::isStandaloneApp())
         return;
 
-    const auto shcore = "SHCore.dll";
-    LoadLibraryA (shcore);
-    const auto shcoreModule = GetModuleHandleA (shcore);
-
-    if (shcoreModule != nullptr)
-    {
-        getDPIForMonitor = (GetDPIForMonitorFunc) GetProcAddress (shcoreModule, "GetDpiForMonitor");
-
-       #if JUCE_WIN_PER_MONITOR_DPI_AWARE
-        getDPIForWindow                     = (GetDPIForWindowFunc) getUser32Function ("GetDpiForWindow");
-        getProcessDPIAwareness              = (GetProcessDPIAwarenessFunc) GetProcAddress (shcoreModule, "GetProcessDpiAwareness");
-        getWindowDPIAwarenessContext        = (GetWindowDPIAwarenessContextFunc) getUser32Function ("GetWindowDpiAwarenessContext");
-        setThreadDPIAwarenessContext        = (SetThreadDPIAwarenessContextFunc) getUser32Function ("SetThreadDpiAwarenessContext");
-        getThreadDPIAwarenessContext        = (GetThreadDPIAwarenessContextFunc) getUser32Function ("GetThreadDpiAwarenessContext");
-        getAwarenessFromDPIAwarenessContext = (GetAwarenessFromDpiAwarenessContextFunc) getUser32Function ("GetAwarenessFromDpiAwarenessContext");
-        setProcessDPIAwareness              = (SetProcessDPIAwarenessFunc) GetProcAddress (shcoreModule, "SetProcessDpiAwareness");
-        setProcessDPIAwarenessContext       = (SetProcessDPIAwarenessContextFunc) getUser32Function ("SetProcessDpiAwarenessContext");
-
-        if (setProcessDPIAwarenessContext != nullptr
-            && setProcessDPIAwarenessContext (DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2))
-            return;
-
-        enableNonClientDPIScaling = (EnableNonClientDPIScalingFunc) getUser32Function ("EnableNonClientDpiScaling");
-
-        if (setProcessDPIAwareness != nullptr && enableNonClientDPIScaling != nullptr
-            && SUCCEEDED (setProcessDPIAwareness (DPI_Awareness::DPI_Awareness_Per_Monitor_Aware)))
-            return;
-       #endif
+    loadDPIAwarenessFunctions();
 
-        if (setProcessDPIAwareness == nullptr)
-            setProcessDPIAwareness = (SetProcessDPIAwarenessFunc) GetProcAddress (shcoreModule, "SetProcessDpiAwareness");
+    if (setProcessDPIAwarenessContext != nullptr
+        && setProcessDPIAwarenessContext (DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2))
+        return;
 
-        if (setProcessDPIAwareness != nullptr && getDPIForMonitor != nullptr
-             && SUCCEEDED (setProcessDPIAwareness (DPI_Awareness::DPI_Awareness_System_Aware)))
-            return;
-    }
+    if (setProcessDPIAwareness != nullptr && enableNonClientDPIScaling != nullptr
+        && SUCCEEDED (setProcessDPIAwareness (DPI_Awareness::DPI_Awareness_Per_Monitor_Aware)))
+        return;
 
-    // fallback for pre Windows 8.1 - equivalent to Process_System_DPI_Aware
-    setProcessDPIAware = (SetProcessDPIAwareFunc) getUser32Function ("SetProcessDPIAware");
+    if (setProcessDPIAwareness != nullptr && getDPIForMonitor != nullptr
+        && SUCCEEDED (setProcessDPIAwareness (DPI_Awareness::DPI_Awareness_System_Aware)))
+        return;
 
     if (setProcessDPIAware != nullptr)
         setProcessDPIAware();
@@ -436,6 +436,9 @@ static bool isPerMonitorDPIAwareProcess()
     {
         setDPIAwareness();
 
+        if (! JUCEApplication::isStandaloneApp())
+            return false;
+
         if (getProcessDPIAwareness == nullptr)
             return false;