1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #ifndef BASE_WIN_SCOPED_SELECT_OBJECT_H_
6 #define BASE_WIN_SCOPED_SELECT_OBJECT_H_
7 
8 #include <windows.h>
9 
10 #include "base/check.h"
11 #include "base/macros.h"
12 
13 namespace base {
14 namespace win {
15 
16 // Helper class for deselecting object from DC.
17 class ScopedSelectObject {
18  public:
ScopedSelectObject(HDC hdc,HGDIOBJ object)19   ScopedSelectObject(HDC hdc, HGDIOBJ object)
20       : hdc_(hdc), oldobj_(SelectObject(hdc, object)) {
21     DCHECK(hdc_);
22     DCHECK(object);
23     DCHECK(oldobj_ != NULL && oldobj_ != HGDI_ERROR);
24   }
25 
~ScopedSelectObject()26   ~ScopedSelectObject() {
27     HGDIOBJ object = SelectObject(hdc_, oldobj_);
28     DCHECK((GetObjectType(oldobj_) != OBJ_REGION && object != NULL) ||
29            (GetObjectType(oldobj_) == OBJ_REGION && object != HGDI_ERROR));
30   }
31 
32  private:
33   HDC hdc_;
34   HGDIOBJ oldobj_;
35 
36   DISALLOW_COPY_AND_ASSIGN(ScopedSelectObject);
37 };
38 
39 }  // namespace win
40 }  // namespace base
41 
42 #endif  // BASE_WIN_SCOPED_SELECT_OBJECT_H_
43