src/java.desktop/windows/native/libsplashscreen/splashscreen_config.h

@@ -53,8 +53,15 @@
 #define RECT_INC_HEIGHT(r) (r).bottom++;
 
 #define INLINE __inline
 
 #define SPLASHEXPORT __declspec(dllexport)
-
-
 #endif
+#ifdef __cplusplus
+    extern "C" {
+#endif
+    float GetScreenDpi();
+    HMONITOR WINAPI getPrimaryMonitor();
+#ifdef __cplusplus
+    }
+#endif
+