Let us start here, from square one. No, from Zero!

cfg/screen_resize.h

@@ -0,0 +1,31 @@
+#pragma once
+
+#include <memory>
+#include <string>
+
+namespace cfg {
+
+    class ScreenResize {
+    private:
+        std::string config_path;
+        // bool config_dirty = false;
+
+    public:
+        ScreenResize();
+        ~ScreenResize();
+        
+        int offset_x = 0;
+        int offset_y = 0;
+        float scale_x = 1.0;
+        float scale_y = 1.0;
+        bool enable_screen_resize = false;
+        bool enable_linear_filter = false;
+        bool keep_aspect_ratio = false;
+        
+        void config_load();
+        void config_save();
+    };
+
+    // globals
+    extern std::unique_ptr<cfg::ScreenResize> SCREENRESIZE;
+}