Alexandre Julliard : user32: Implement GetDpiForWindow().

[Alexandre Julliard]

Module: wine
Branch: master
Commit: fb563978d815f74786bf25baa0bf4c4362595dd6
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=fb563978d815f74786bf25baa0bf4c4362595dd6

Author: Alexandre Julliard <julliard at winehq.org>
Date:   Thu Apr 19 10:47:18 2018 +0200

user32: Implement GetDpiForWindow().

Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 dlls/user32/sysparams.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/dlls/user32/sysparams.c b/dlls/user32/sysparams.c
index 8c5dd0a..715bf59 100644
--- a/dlls/user32/sysparams.c
+++ b/dlls/user32/sysparams.c
@@ -3313,8 +3313,21 @@ BOOL WINAPI GetDpiForMonitorInternal( HMONITOR monitor, UINT type, UINT *x, UINT
  */
 UINT WINAPI GetDpiForWindow( HWND hwnd )
 {
-    FIXME( "stub: %p\n", hwnd );
-    return GetDpiForSystem();
+    UINT dpi;
+
+    switch (GetAwarenessFromDpiAwarenessContext( GetWindowDpiAwarenessContext( hwnd )))
+    {
+    case DPI_AWARENESS_UNAWARE:
+        return USER_DEFAULT_SCREEN_DPI;
+    case DPI_AWARENESS_SYSTEM_AWARE:
+        return get_system_dpi();
+    case DPI_AWARENESS_PER_MONITOR_AWARE:
+        GetDpiForMonitorInternal( MonitorFromWindow( hwnd, MONITOR_DEFAULTTOPRIMARY ),
+                                  0 /* MDT_EFFECTIVE_DPI */, &dpi, NULL );
+        return dpi;
+    default:
+        return 0;
+    }
 }
 
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