1 // Copyright (c) 2011 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/base/l10n/l10n_util_win.h" 6 7 #include <windowsx.h> 8 #include <algorithm> 9 #include <iterator> 10 11 #include "base/i18n/rtl.h" 12 #include "base/lazy_instance.h" 13 #include "base/strings/string_number_conversions.h" 14 #include "base/win/i18n.h" 15 #include "base/win/windows_version.h" 16 #include "grit/app_locale_settings.h" 17 #include "ui/base/l10n/l10n_util.h" 18 #include "ui/gfx/display.h" 19 #include "ui/gfx/win/dpi.h" 20 21 namespace { 22 23 void AdjustLogFont(const string16& font_family, 24 double font_size_scaler, 25 double dpi_scale, 26 LOGFONT* logfont) { 27 DCHECK(font_size_scaler > 0); 28 font_size_scaler = std::max(std::min(font_size_scaler, 2.0), 0.7); 29 // Font metrics are computed in pixels and scale in high-DPI mode. 30 // Normalized by the DPI scale factor in order to work in DIP with 31 // Views/Aura. Call with dpi_scale=1 to keep the size in pixels. 32 font_size_scaler /= dpi_scale; 33 logfont->lfHeight = static_cast<long>(font_size_scaler * 34 static_cast<double>(abs(logfont->lfHeight)) + 0.5) * 35 (logfont->lfHeight > 0 ? 1 : -1); 36 37 // TODO(jungshik): We may want to check the existence of the font. 38 // If it's not installed, we shouldn't adjust the font. 39 if (font_family != L"default") { 40 int name_len = std::min(static_cast<int>(font_family.size()), 41 LF_FACESIZE -1); 42 memcpy(logfont->lfFaceName, font_family.data(), name_len * sizeof(WORD)); 43 logfont->lfFaceName[name_len] = 0; 44 } 45 } 46 47 bool IsFontPresent(const wchar_t* font_name) { 48 HFONT hfont = CreateFont(12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 49 font_name); 50 if (hfont == NULL) 51 return false; 52 HDC dc = GetDC(0); 53 HGDIOBJ oldFont = static_cast<HFONT>(SelectObject(dc, hfont)); 54 WCHAR actual_font_name[LF_FACESIZE]; 55 DWORD size_ret = GetTextFace(dc, LF_FACESIZE, actual_font_name); 56 actual_font_name[LF_FACESIZE - 1] = 0; 57 SelectObject(dc, oldFont); 58 DeleteObject(hfont); 59 ReleaseDC(0, dc); 60 // We don't have to worry about East Asian fonts with locale-dependent 61 // names here. 62 return wcscmp(font_name, actual_font_name) == 0; 63 } 64 65 class OverrideLocaleHolder { 66 public: 67 OverrideLocaleHolder() {} 68 const std::vector<std::string>& value() const { return value_; } 69 void swap_value(std::vector<std::string>* override_value) { 70 value_.swap(*override_value); 71 } 72 private: 73 std::vector<std::string> value_; 74 DISALLOW_COPY_AND_ASSIGN(OverrideLocaleHolder); 75 }; 76 77 base::LazyInstance<OverrideLocaleHolder> override_locale_holder = 78 LAZY_INSTANCE_INITIALIZER; 79 80 } // namespace 81 82 namespace l10n_util { 83 84 int GetExtendedStyles() { 85 return !base::i18n::IsRTL() ? 0 : WS_EX_LAYOUTRTL | WS_EX_RTLREADING; 86 } 87 88 int GetExtendedTooltipStyles() { 89 return !base::i18n::IsRTL() ? 0 : WS_EX_LAYOUTRTL; 90 } 91 92 void HWNDSetRTLLayout(HWND hwnd) { 93 DWORD ex_style = ::GetWindowLong(hwnd, GWL_EXSTYLE); 94 95 // We don't have to do anything if the style is already set for the HWND. 96 if (!(ex_style & WS_EX_LAYOUTRTL)) { 97 ex_style |= WS_EX_LAYOUTRTL; 98 ::SetWindowLong(hwnd, GWL_EXSTYLE, ex_style); 99 100 // Right-to-left layout changes are not applied to the window immediately 101 // so we should make sure a WM_PAINT is sent to the window by invalidating 102 // the entire window rect. 103 ::InvalidateRect(hwnd, NULL, true); 104 } 105 } 106 107 bool IsLocaleSupportedByOS(const std::string& locale) { 108 // Block Amharic on Windows XP unless 'Abyssinica SIL' font is present. 109 // On Win XP, no Ethiopic/Amahric font is availabel out of box. We hard-coded 110 // 'Abyssinica SIL' in the resource bundle to use in the UI. Check 111 // for its presence to determine whether or not to support Amharic UI on XP. 112 return (base::win::GetVersion() >= base::win::VERSION_VISTA || 113 !LowerCaseEqualsASCII(locale, "am") || IsFontPresent(L"Abyssinica SIL")); 114 } 115 116 bool NeedOverrideDefaultUIFont(string16* override_font_family, 117 double* font_size_scaler) { 118 // This is rather simple-minded to deal with the UI font size 119 // issue for some Indian locales (ml, bn, hi) for which 120 // the default Windows fonts are too small to be legible. For those 121 // locales, IDS_UI_FONT_FAMILY is set to an actual font family to 122 // use while for other locales, it's set to 'default'. 123 124 // XP and Vista or later have different font size issues and 125 // we need separate ui font specifications. 126 int ui_font_family_id = IDS_UI_FONT_FAMILY; 127 int ui_font_size_scaler_id = IDS_UI_FONT_SIZE_SCALER; 128 if (base::win::GetVersion() < base::win::VERSION_VISTA) { 129 ui_font_family_id = IDS_UI_FONT_FAMILY_XP; 130 ui_font_size_scaler_id = IDS_UI_FONT_SIZE_SCALER_XP; 131 } 132 133 string16 ui_font_family = GetStringUTF16(ui_font_family_id); 134 int scaler100; 135 if (!base::StringToInt(l10n_util::GetStringUTF16(ui_font_size_scaler_id), 136 &scaler100)) 137 return false; 138 139 // We use the OS default in two cases: 140 // 1) The resource bundle has 'default' and '100' for font family and 141 // font scaler. 142 // 2) The resource bundle is not available for some reason and 143 // ui_font_family is empty. 144 if (ui_font_family == L"default" && scaler100 == 100 || 145 ui_font_family.empty()) 146 return false; 147 if (override_font_family && font_size_scaler) { 148 override_font_family->swap(ui_font_family); 149 *font_size_scaler = scaler100 / 100.0; 150 } 151 return true; 152 } 153 154 void AdjustUIFont(LOGFONT* logfont) { 155 double dpi_scale = gfx::GetDPIScale(); 156 if (gfx::Display::HasForceDeviceScaleFactor()) { 157 // If the scale is forced, we don't need to adjust it here. 158 dpi_scale = 1.0; 159 } 160 AdjustUIFontForDIP(dpi_scale, logfont); 161 } 162 163 void AdjustUIFontForDIP(float dpi_scale, LOGFONT* logfont) { 164 string16 ui_font_family = L"default"; 165 double ui_font_size_scaler = 1; 166 if (NeedOverrideDefaultUIFont(&ui_font_family, &ui_font_size_scaler) || 167 dpi_scale != 1) { 168 AdjustLogFont(ui_font_family, ui_font_size_scaler, dpi_scale, logfont); 169 } 170 } 171 172 void AdjustUIFontForWindow(HWND hwnd) { 173 string16 ui_font_family; 174 double ui_font_size_scaler; 175 if (NeedOverrideDefaultUIFont(&ui_font_family, &ui_font_size_scaler)) { 176 LOGFONT logfont; 177 if (GetObject(GetWindowFont(hwnd), sizeof(logfont), &logfont)) { 178 double dpi_scale = 1; 179 AdjustLogFont(ui_font_family, ui_font_size_scaler, dpi_scale, &logfont); 180 HFONT hfont = CreateFontIndirect(&logfont); 181 if (hfont) 182 SetWindowFont(hwnd, hfont, FALSE); 183 } 184 } 185 } 186 187 void OverrideLocaleWithUILanguageList() { 188 std::vector<std::wstring> ui_languages; 189 if (base::win::i18n::GetThreadPreferredUILanguageList(&ui_languages)) { 190 std::vector<std::string> ascii_languages; 191 ascii_languages.reserve(ui_languages.size()); 192 std::transform(ui_languages.begin(), ui_languages.end(), 193 std::back_inserter(ascii_languages), &WideToASCII); 194 override_locale_holder.Get().swap_value(&ascii_languages); 195 } else { 196 NOTREACHED() << "Failed to determine the UI language for locale override."; 197 } 198 } 199 200 const std::vector<std::string>& GetLocaleOverrides() { 201 return override_locale_holder.Get().value(); 202 } 203 204 } // namespace l10n_util 205
