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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef UI_GFX_WIN_SCOPED_SET_MAP_MODE_H_ | 5 #ifndef UI_GFX_WIN_SCOPED_SET_MAP_MODE_H_ |
| 6 #define UI_GFX_WIN_SCOPED_SET_MAP_MODE_H_ | 6 #define UI_GFX_WIN_SCOPED_SET_MAP_MODE_H_ |
| 7 | 7 |
| 8 #include <windows.h> | 8 #include <windows.h> |
| 9 | 9 |
| 10 #include "base/basictypes.h" | |
| 11 #include "base/logging.h" | 10 #include "base/logging.h" |
| 11 #include "base/macros.h" |
| 12 | 12 |
| 13 namespace gfx { | 13 namespace gfx { |
| 14 | 14 |
| 15 // Helper class for setting and restore the map mode on a DC. | 15 // Helper class for setting and restore the map mode on a DC. |
| 16 class ScopedSetMapMode { | 16 class ScopedSetMapMode { |
| 17 public: | 17 public: |
| 18 ScopedSetMapMode(HDC hdc, int map_mode) | 18 ScopedSetMapMode(HDC hdc, int map_mode) |
| 19 : hdc_(hdc), | 19 : hdc_(hdc), |
| 20 old_map_mode_(SetMapMode(hdc, map_mode)) { | 20 old_map_mode_(SetMapMode(hdc, map_mode)) { |
| 21 DCHECK(hdc_); | 21 DCHECK(hdc_); |
| 22 DCHECK_NE(map_mode, 0); | 22 DCHECK_NE(map_mode, 0); |
| 23 DCHECK_NE(old_map_mode_, 0); | 23 DCHECK_NE(old_map_mode_, 0); |
| 24 } | 24 } |
| 25 | 25 |
| 26 ~ScopedSetMapMode() { | 26 ~ScopedSetMapMode() { |
| 27 const int mode = SetMapMode(hdc_, old_map_mode_); | 27 const int mode = SetMapMode(hdc_, old_map_mode_); |
| 28 DCHECK_NE(mode, 0); | 28 DCHECK_NE(mode, 0); |
| 29 } | 29 } |
| 30 | 30 |
| 31 private: | 31 private: |
| 32 HDC hdc_; | 32 HDC hdc_; |
| 33 int old_map_mode_; | 33 int old_map_mode_; |
| 34 | 34 |
| 35 DISALLOW_COPY_AND_ASSIGN(ScopedSetMapMode); | 35 DISALLOW_COPY_AND_ASSIGN(ScopedSetMapMode); |
| 36 }; | 36 }; |
| 37 | 37 |
| 38 } // namespace gfx | 38 } // namespace gfx |
| 39 | 39 |
| 40 #endif // UI_GFX_WIN_SCOPED_SET_MAP_MODE_H_ | 40 #endif // UI_GFX_WIN_SCOPED_SET_MAP_MODE_H_ |
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