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/logging.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: 19 ScopedSelectObject(HDC hdc, HGDIOBJ object) 20 : hdc_(hdc), 21 oldobj_(SelectObject(hdc, object)) { 22 DCHECK(hdc_); 23 DCHECK(object); 24 DCHECK(oldobj_ != NULL && oldobj_ != HGDI_ERROR); 25 } 26 27 ~ScopedSelectObject() { 28 HGDIOBJ object = SelectObject(hdc_, oldobj_); 29 DCHECK((GetObjectType(oldobj_) != OBJ_REGION && object != NULL) || 30 (GetObjectType(oldobj_) == OBJ_REGION && object != HGDI_ERROR)); 31 } 32 33 private: 34 HDC hdc_; 35 HGDIOBJ oldobj_; 36 37 DISALLOW_COPY_AND_ASSIGN(ScopedSelectObject); 38 }; 39 40 } // namespace win 41 } // namespace base 42 43 #endif // BASE_WIN_SCOPED_SELECT_OBJECT_H_ 44
