direct3d9: only stretch the visible area to fill the displayed texture

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/video_output/msw/direct3d9.c

@@ -1481,7 +1481,12 @@ static int Direct3D9ImportPicture(vout_display_t *vd,
 
     /* Copy picture surface into texture surface
      * color space conversion happen here */
-    hr = IDirect3DDevice9_StretchRect(sys->d3ddev, source, NULL, destination, NULL, D3DTEXF_LINEAR);
+    RECT cropSource;
+    cropSource.left = 0;
+    cropSource.top = 0;
+    cropSource.right = vd->fmt.i_visible_width;
+    cropSource.bottom = vd->fmt.i_visible_height;
+    hr = IDirect3DDevice9_StretchRect(sys->d3ddev, source, &cropSource, destination, NULL, D3DTEXF_LINEAR);
     IDirect3DSurface9_Release(destination);
     if (FAILED(hr)) {
         msg_Dbg(vd, "Failed IDirect3DDevice9_StretchRect: source 0x%p 0x%0lx", source, hr);