win32u: Directly access system DPI in ntgdi.

dlls/win32u/gdiobj.c

@@ -572,16 +572,6 @@ BOOL GDI_dec_ref_count( HGDIOBJ handle )
 }
 
 
-/******************************************************************************
- *              get_system_dpi
- *
- * Get the system DPI, based on the DPI awareness mode.
- */
-DWORD get_system_dpi(void)
-{
-    return user_callbacks ? user_callbacks->pGetDpiForSystem() : 96;
-}
-
 static HFONT create_font( const LOGFONTW *deffont )
 {
     ENUMLOGFONTEXDVW lf;

dlls/win32u/sysparams.c

@@ -1395,6 +1395,13 @@ static UINT get_thread_dpi(void)
     }
 }
 
+/* see GetDpiForSystem */
+UINT get_system_dpi(void)
+{
+    if (get_thread_dpi_awareness() == DPI_AWARENESS_UNAWARE) return USER_DEFAULT_SCREEN_DPI;
+    return system_dpi;
+}
+
 /**********************************************************************
  *              map_dpi_rect
  */

dlls/win32u/win32u_private.h

@@ -33,7 +33,6 @@
 struct user_callbacks
 {
     HWND (WINAPI *pGetDesktopWindow)(void);
-    UINT (WINAPI *pGetDpiForSystem)(void);
     BOOL (WINAPI *pGetMonitorInfoW)( HMONITOR, LPMONITORINFO );
     INT (WINAPI *pGetSystemMetrics)(INT);
     BOOL (WINAPI *pGetWindowRect)( HWND hwnd, LPRECT rect );
@@ -241,6 +240,7 @@ struct unix_funcs
                                       struct window_surface *surface );
 };
 
+extern UINT get_system_dpi(void) DECLSPEC_HIDDEN;
 extern RECT get_virtual_screen_rect(void) DECLSPEC_HIDDEN;
 
 extern void wrappers_init( unixlib_handle_t handle ) DECLSPEC_HIDDEN;

dlls/win32u/wrappers.c

@@ -940,14 +940,6 @@ static HWND WINAPI call_GetDesktopWindow(void)
     return pGetDesktopWindow ? pGetDesktopWindow() : NULL;
 }
 
-static UINT WINAPI call_GetDpiForSystem(void)
-{
-    static UINT (WINAPI *pGetDpiForSystem)(void);
-    if (!pGetDpiForSystem)
-        pGetDpiForSystem = get_user_proc( "GetDpiForSystem", FALSE );
-    return pGetDpiForSystem ? pGetDpiForSystem() : 96;
-}
-
 static BOOL WINAPI call_GetMonitorInfoW( HMONITOR monitor, MONITORINFO *info )
 {
     static BOOL (WINAPI *pGetMonitorInfoW)( HMONITOR, LPMONITORINFO );
@@ -1000,7 +992,6 @@ static HWND WINAPI call_WindowFromDC( HDC hdc )
 static const struct user_callbacks user_funcs =
 {
     call_GetDesktopWindow,
-    call_GetDpiForSystem,
     call_GetMonitorInfoW,
     call_GetSystemMetrics,
     call_GetWindowRect,