Untested cross platform implementation

Source/Engine/Platform/Android/AndroidWindow.cpp

@@ -6,10 +6,14 @@
 #include "Engine/Graphics/RenderTask.h"
 #include <Engine/Main/Android/android_native_app_glue.h>
 
+#define DefaultDPI 96
+
 AndroidWindow::AndroidWindow(const CreateWindowSettings& settings)
     : WindowBase(settings)
 {
     _clientSize = settings.Size;
+    _dpi = DefaultDPI;
+    _dpiScale = (float)_dpi / (float)DefaultDPI;
 }
 
 AndroidWindow::~AndroidWindow()

Source/Engine/Platform/Linux/LinuxWindow.cpp

@@ -31,6 +31,7 @@
 #define _NET_WM_STATE_REMOVE 0L // remove/unset property
 #define _NET_WM_STATE_ADD 1L // add/set property
 #define _NET_WM_STATE_TOGGLE 2L // toggle property
+#define DefaultDPI 96
 
 // Window routines function prolog
 #define LINUX_WINDOW_PROLOG X11::Display* display = (X11::Display*)LinuxPlatform::GetXDisplay(); X11::Window window =  (X11::Window)_window
@@ -138,6 +139,9 @@ LinuxWindow::LinuxWindow(const CreateWindowSettings& settings)
 	if (settings.Parent)
 		X11::XSetTransientForHint(display, window, (X11::Window)((LinuxWindow*)settings.Parent)->GetNativePtr());
 
+    _dpi = Platform::GetDpi();
+    _dpiScale = (float)_dpi / (float)DefaultDPI;
+    
 	// Set mask
 	long eventMask =
 			ExposureMask | FocusChangeMask |

Source/Engine/Platform/UWP/UWPWindow.h

@@ -100,7 +100,6 @@ private:
 
     UWPWindowImpl* _impl;
 
-    float _dpi, _dpiScale;
     Vector2 _logicalSize;
 
 public:

Source/Engine/Platform/Windows/WindowsWindow.cpp

@@ -98,7 +98,7 @@ WindowsWindow::WindowsWindow(const CreateWindowSettings& settings)
         (HINSTANCE)Platform::Instance,
         nullptr);
     
-    _dpi = DefaultDPI;
+    _dpi = Platform::GetDpi();
     
     const HMODULE user32Dll = LoadLibraryW(L"user32.dll");
     if (user32Dll)