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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 "ui/gfx/font_smoothing_win.h" | |
| 6 | |
| 7 #include "base/memory/singleton.h" | |
| 8 #include "ui/gfx/win/singleton_hwnd.h" | |
| 9 | |
| 10 namespace { | |
| 11 | |
| 12 // Helper class to cache font smoothing settings and listen for notifications | |
| 13 // to re-query them from the system. | |
| 14 class CachedFontSmoothingSettings : public gfx::SingletonHwnd::Observer { | |
| 15 public: | |
| 16 static CachedFontSmoothingSettings* GetInstance(); | |
| 17 | |
| 18 // Returns the cached Windows font smoothing settings. Queries the settings | |
| 19 // via Windows APIs and begins listening for changes when called for the | |
| 20 // first time. | |
| 21 void GetFontSmoothingSettings(bool* smoothing_enabled, | |
| 22 bool* cleartype_enabled); | |
| 23 | |
| 24 private: | |
| 25 friend struct DefaultSingletonTraits<CachedFontSmoothingSettings>; | |
| 26 | |
| 27 CachedFontSmoothingSettings(); | |
| 28 virtual ~CachedFontSmoothingSettings(); | |
| 29 | |
| 30 // Listener for WM_SETTINGCHANGE notifications. | |
| 31 virtual void OnWndProc(HWND hwnd, | |
| 32 UINT message, | |
| 33 WPARAM wparam, | |
| 34 LPARAM lparam) OVERRIDE; | |
| 35 | |
| 36 // Queries the font settings from the system. | |
| 37 void QueryFontSettings(); | |
| 38 | |
| 39 // Indicates whether the SingletonHwnd::Observer has been registered. | |
| 40 bool observer_added_; | |
| 41 | |
| 42 // Indicates whether |smoothing_enabled_| and |cleartype_enabled_| are valid | |
| 43 // or need to be re-queried from the system. | |
| 44 bool need_to_query_settings_; | |
| 45 | |
| 46 // Indicates that font smoothing is enabled. | |
| 47 bool smoothing_enabled_; | |
| 48 | |
| 49 // Indicates that the ClearType font smoothing is enabled. | |
| 50 bool cleartype_enabled_; | |
| 51 | |
| 52 DISALLOW_COPY_AND_ASSIGN(CachedFontSmoothingSettings); | |
| 53 }; | |
| 54 | |
| 55 // static | |
| 56 CachedFontSmoothingSettings* CachedFontSmoothingSettings::GetInstance() { | |
| 57 return Singleton<CachedFontSmoothingSettings>::get(); | |
| 58 } | |
| 59 | |
| 60 void CachedFontSmoothingSettings::GetFontSmoothingSettings( | |
| 61 bool* smoothing_enabled, | |
| 62 bool* cleartype_enabled) { | |
| 63 // If cached settings are stale, query them from the OS. | |
| 64 if (need_to_query_settings_) { | |
| 65 QueryFontSettings(); | |
| 66 need_to_query_settings_ = false; | |
| 67 } | |
| 68 if (!observer_added_) { | |
| 69 gfx::SingletonHwnd::GetInstance()->AddObserver(this); | |
| 70 observer_added_ = true; | |
| 71 } | |
| 72 *smoothing_enabled = smoothing_enabled_; | |
| 73 *cleartype_enabled = cleartype_enabled_; | |
| 74 } | |
| 75 | |
| 76 CachedFontSmoothingSettings::CachedFontSmoothingSettings() | |
| 77 : observer_added_(false), | |
| 78 need_to_query_settings_(true), | |
| 79 smoothing_enabled_(false), | |
| 80 cleartype_enabled_(false) { | |
| 81 } | |
| 82 | |
| 83 CachedFontSmoothingSettings::~CachedFontSmoothingSettings() { | |
| 84 // Can't remove the SingletonHwnd observer here since SingletonHwnd may have | |
| 85 // been destroyed already (both singletons). | |
| 86 } | |
| 87 | |
| 88 void CachedFontSmoothingSettings::OnWndProc(HWND hwnd, | |
| 89 UINT message, | |
| 90 WPARAM wparam, | |
| 91 LPARAM lparam) { | |
| 92 if (message == WM_SETTINGCHANGE) | |
| 93 need_to_query_settings_ = true; | |
| 94 } | |
| 95 | |
| 96 void CachedFontSmoothingSettings::QueryFontSettings() { | |
| 97 smoothing_enabled_ = false; | |
| 98 cleartype_enabled_ = false; | |
| 99 | |
| 100 BOOL enabled = false; | |
| 101 if (SystemParametersInfo(SPI_GETFONTSMOOTHING, 0, &enabled, 0) && enabled) { | |
| 102 smoothing_enabled_ = true; | |
| 103 | |
| 104 UINT smooth_type = 0; | |
| 105 if (SystemParametersInfo(SPI_GETFONTSMOOTHINGTYPE, 0, &smooth_type, 0)) | |
| 106 cleartype_enabled_ = (smooth_type == FE_FONTSMOOTHINGCLEARTYPE); | |
| 107 } | |
| 108 } | |
| 109 | |
| 110 } // namespace | |
| 111 | |
| 112 namespace gfx { | |
| 113 | |
| 114 void GetCachedFontSmoothingSettings(bool* smoothing_enabled, | |
| 115 bool* cleartype_enabled) { | |
| 116 CachedFontSmoothingSettings::GetInstance()->GetFontSmoothingSettings( | |
| 117 smoothing_enabled, | |
| 118 cleartype_enabled); | |
| 119 } | |
| 120 | |
| 121 } // namespace gfx | |
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Chromium Code Reviews
Issue 385463002:
Support FontRenderParams on Win; fix RenderTextHarfBuzz. (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src