1 // Copyright (c) 2010 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_GDI_OBJECT_H_ 6 #define BASE_WIN_SCOPED_GDI_OBJECT_H_ 7 8 #include <windows.h> 9 10 #include "base/basictypes.h" 11 #include "base/logging.h" 12 13 namespace base { 14 namespace win { 15 16 // Like ScopedHandle but for GDI objects. 17 template<class T> 18 class ScopedGDIObject { 19 public: 20 ScopedGDIObject() : object_(NULL) {} 21 explicit ScopedGDIObject(T object) : object_(object) {} 22 23 ~ScopedGDIObject() { 24 Close(); 25 } 26 27 T Get() { 28 return object_; 29 } 30 31 void Set(T object) { 32 if (object_ && object != object_) 33 Close(); 34 object_ = object; 35 } 36 37 ScopedGDIObject& operator=(T object) { 38 Set(object); 39 return *this; 40 } 41 42 T release() { 43 T object = object_; 44 object_ = NULL; 45 return object; 46 } 47 48 operator T() { return object_; } 49 50 private: 51 void Close() { 52 if (object_) 53 DeleteObject(object_); 54 } 55 56 T object_; 57 DISALLOW_COPY_AND_ASSIGN(ScopedGDIObject); 58 }; 59 60 // An explicit specialization for HICON because we have to call DestroyIcon() 61 // instead of DeleteObject() for HICON. 62 template<> 63 void inline ScopedGDIObject<HICON>::Close() { 64 if (object_) 65 DestroyIcon(object_); 66 } 67 68 // Typedefs for some common use cases. 69 typedef ScopedGDIObject<HBITMAP> ScopedBitmap; 70 typedef ScopedGDIObject<HRGN> ScopedRegion; 71 typedef ScopedGDIObject<HFONT> ScopedHFONT; 72 typedef ScopedGDIObject<HICON> ScopedHICON; 73 74 } // namespace win 75 } // namespace base 76 77 #endif // BASE_WIN_SCOPED_GDI_OBJECT_H_ 78
