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      1 // Copyright (c) 2012 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 UI_GFX_WIN_SCOPED_SET_MAP_MODE_H_
      6 #define UI_GFX_WIN_SCOPED_SET_MAP_MODE_H_
      7 
      8 #include <windows.h>
      9 
     10 #include "base/basictypes.h"
     11 #include "base/logging.h"
     12 
     13 namespace gfx {
     14 
     15 // Helper class for setting and restore the map mode on a DC.
     16 class ScopedSetMapMode {
     17  public:
     18   ScopedSetMapMode(HDC hdc, int map_mode)
     19       : hdc_(hdc),
     20         old_map_mode_(SetMapMode(hdc, map_mode)) {
     21     DCHECK(hdc_);
     22     DCHECK_NE(map_mode, 0);
     23     DCHECK_NE(old_map_mode_, 0);
     24   }
     25 
     26   ~ScopedSetMapMode() {
     27     const int mode = SetMapMode(hdc_, old_map_mode_);
     28     DCHECK_NE(mode, 0);
     29   }
     30 
     31  private:
     32   HDC hdc_;
     33   int old_map_mode_;
     34 
     35   DISALLOW_COPY_AND_ASSIGN(ScopedSetMapMode);
     36 };
     37 
     38 }  // namespace gfx
     39 
     40 #endif  // UI_GFX_WIN_SCOPED_SET_MAP_MODE_H_
     41