[PATCH] gdi32: Accept 16-bit handles in get_dc_attr().

[Oleh Nykyforchyn]

When background is erased in a 16 bit app, a handle to DC is passed
through USER16 functions, namely CallWindowProc16 (USER.122) and
DefDriverProc16 (USER.255), whose respective parameters are of type
WPARAM16, hence the upper part of the handle is cut. Later
the returned handle is rejected by get_dc_attr() in GDI32 because
its type is 0, although such handles are accepted by handle_entry().
This results in black and not cleared background.  Allowing type==0
in get_dc_attr() solves the problem.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=51899
Signed-off-by: Oleh Nykyforchyn <oleh.nyk at gmail.com>
---
 dlls/gdi32/dc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dlls/gdi32/dc.c b/dlls/gdi32/dc.c
index 1511c565194..a161b3cb640 100644
--- a/dlls/gdi32/dc.c
+++ b/dlls/gdi32/dc.c
@@ -56,7 +56,7 @@ DC_ATTR *get_dc_attr( HDC hdc )
 {
     DWORD type = gdi_handle_type( hdc );
     DC_ATTR *dc_attr;
-    if ((type & 0x1f0000) != NTGDI_OBJ_DC || !(dc_attr = get_gdi_client_ptr( hdc, 0 )))
+    if ((type && (type & 0x1f0000) != NTGDI_OBJ_DC) || !(dc_attr = get_gdi_client_ptr( hdc, 0 )))
     {
         SetLastError( ERROR_INVALID_HANDLE );
         return NULL;
-- 
2.33.0