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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 #include "base/win/scoped_hdc.h" | |
| 6 | |
| 7 #include "base/logging.h" | |
| 8 | |
| 9 namespace base { | |
| 10 namespace win { | |
| 11 | |
| 12 ScopedDC::ScopedDC(HDC hdc) | |
| 13 : hdc_(hdc), | |
| 14 bitmap_(0), | |
| 15 font_(0), | |
| 16 brush_(0), | |
| 17 pen_(0), | |
| 18 region_(0) { | |
| 19 } | |
| 20 | |
| 21 ScopedDC::~ScopedDC() {} | |
| 22 | |
| 23 void ScopedDC::SelectBitmap(HBITMAP bitmap) { | |
| 24 Select(bitmap, &bitmap_); | |
| 25 } | |
| 26 | |
| 27 void ScopedDC::SelectFont(HFONT font) { | |
| 28 Select(font, &font_); | |
| 29 } | |
| 30 | |
| 31 void ScopedDC::SelectBrush(HBRUSH brush) { | |
| 32 Select(brush, &brush_); | |
| 33 } | |
| 34 | |
| 35 void ScopedDC::SelectPen(HPEN pen) { | |
| 36 Select(pen, &pen_); | |
| 37 } | |
| 38 | |
| 39 void ScopedDC::SelectRegion(HRGN region) { | |
| 40 Select(region, ®ion_); | |
| 41 } | |
| 42 | |
| 43 void ScopedDC::Close() { | |
| 44 if (!hdc_) | |
| 45 return; | |
| 46 ResetObjects(); | |
| 47 DisposeDC(hdc_); | |
| 48 } | |
| 49 | |
| 50 void ScopedDC::Reset(HDC hdc) { | |
| 51 Close(); | |
| 52 hdc_ = hdc; | |
| 53 } | |
| 54 | |
| 55 void ScopedDC::ResetObjects() { | |
| 56 if (bitmap_) { | |
| 57 SelectObject(hdc_, bitmap_); | |
| 58 bitmap_ = 0; | |
| 59 } | |
| 60 if (font_) { | |
| 61 SelectObject(hdc_, font_); | |
| 62 font_ = 0; | |
| 63 } | |
| 64 if (brush_) { | |
| 65 SelectObject(hdc_, brush_); | |
| 66 brush_ = 0; | |
| 67 } | |
| 68 if (pen_) { | |
| 69 SelectObject(hdc_, pen_); | |
| 70 pen_ = 0; | |
| 71 } | |
| 72 if (region_) { | |
| 73 SelectObject(hdc_, region_); | |
| 74 region_ = 0; | |
| 75 } | |
| 76 } | |
| 77 | |
| 78 void ScopedDC::Select(HGDIOBJ object, HGDIOBJ* holder) { | |
| 79 HGDIOBJ old = SelectObject(hdc_, object); | |
| 80 DCHECK(old); | |
| 81 // We only want to store the first |old| object. | |
| 82 if (!*holder) | |
| 83 *holder = old; | |
| 84 } | |
| 85 | |
| 86 ScopedGetDC::ScopedGetDC(HWND hwnd) : ScopedDC(GetDC(hwnd)), hwnd_(hwnd) { | |
| 87 } | |
| 88 | |
| 89 ScopedGetDC::~ScopedGetDC() { | |
| 90 Close(); | |
| 91 } | |
| 92 | |
| 93 void ScopedGetDC::DisposeDC(HDC hdc) { | |
| 94 ReleaseDC(hwnd_, hdc); | |
| 95 } | |
| 96 | |
| 97 ScopedCreateDC::ScopedCreateDC() : ScopedDC(0) { | |
| 98 } | |
| 99 | |
| 100 ScopedCreateDC::ScopedCreateDC(HDC hdc) : ScopedDC(hdc) { | |
| 101 } | |
| 102 | |
| 103 ScopedCreateDC::~ScopedCreateDC() { | |
| 104 Close(); | |
| 105 } | |
| 106 | |
| 107 void ScopedCreateDC::Set(HDC hdc) { | |
| 108 Reset(hdc); | |
| 109 } | |
| 110 | |
| 111 void ScopedCreateDC::DisposeDC(HDC hdc) { | |
| 112 DeleteDC(hdc); | |
| 113 } | |
| 114 | |
| 115 } // namespace win | |
| 116 } // namespace base | |
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Chromium Code Reviews
Issue 9387027:
Revert 121840 - Make scoped dc objects smarter (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src/