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/strings/utf_string_conversions.h" 15 #include "base/win/i18n.h" 16 #include "base/win/windows_version.h" 17 #include "grit/app_locale_settings.h" 18 #include "ui/base/l10n/l10n_util.h" 19 #include "ui/gfx/display.h" 20 #include "ui/gfx/win/dpi.h" 21 22 namespace { 23 24 void AdjustLogFont(const base::string16& font_family, 25 double font_size_scaler, 26 double dpi_scale, 27 LOGFONT* logfont) { 28 DCHECK(font_size_scaler > 0); 29 font_size_scaler = std::max(std::min(font_size_scaler, 2.0), 0.7); 30 // Font metrics are computed in pixels and scale in high-DPI mode. 31 // Normalized by the DPI scale factor in order to work in DIP with 32 // Views/Aura. Call with dpi_scale=1 to keep the size in pixels. 33 font_size_scaler /= dpi_scale; 34 logfont->lfHeight = static_cast<long>(font_size_scaler * 35 static_cast<double>(abs(logfont->lfHeight)) + 0.5) * 36 (logfont->lfHeight > 0 ? 1 : -1); 37 38 // TODO(jungshik): We may want to check the existence of the font. 39 // If it's not installed, we shouldn't adjust the font. 40 if (font_family != L"default") { 41 int name_len = std::min(static_cast<int>(font_family.size()), 42 LF_FACESIZE -1); 43 memcpy(logfont->lfFaceName, font_family.data(), name_len * sizeof(WORD)); 44 logfont->lfFaceName[name_len] = 0; 45 } 46 } 47 48 bool IsFontPresent(const wchar_t* font_name) { 49 HFONT hfont = CreateFont(12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 50 font_name); 51 if (hfont == NULL) 52 return false; 53 HDC dc = GetDC(0); 54 HGDIOBJ oldFont = static_cast<HFONT>(SelectObject(dc, hfont)); 55 WCHAR actual_font_name[LF_FACESIZE]; 56 DWORD size_ret = GetTextFace(dc, LF_FACESIZE, actual_font_name); 57 actual_font_name[LF_FACESIZE - 1] = 0; 58 SelectObject(dc, oldFont); 59 DeleteObject(hfont); 60 ReleaseDC(0, dc); 61 // We don't have to worry about East Asian fonts with locale-dependent 62 // names here. 63 return wcscmp(font_name, actual_font_name) == 0; 64 } 65 66 class OverrideLocaleHolder { 67 public: 68 OverrideLocaleHolder() {} 69 const std::vector<std::string>& value() const { return value_; } 70 void swap_value(std::vector<std::string>* override_value) { 71 value_.swap(*override_value); 72 } 73 private: 74 std::vector<std::string> value_; 75 DISALLOW_COPY_AND_ASSIGN(OverrideLocaleHolder); 76 }; 77 78 base::LazyInstance<OverrideLocaleHolder> override_locale_holder = 79 LAZY_INSTANCE_INITIALIZER; 80 81 } // namespace 82 83 namespace l10n_util { 84 85 int GetExtendedStyles() { 86 return !base::i18n::IsRTL() ? 0 : WS_EX_LAYOUTRTL | WS_EX_RTLREADING; 87 } 88 89 int GetExtendedTooltipStyles() { 90 return !base::i18n::IsRTL() ? 0 : WS_EX_LAYOUTRTL; 91 } 92 93 void HWNDSetRTLLayout(HWND hwnd) { 94 DWORD ex_style = ::GetWindowLong(hwnd, GWL_EXSTYLE); 95 96 // We don't have to do anything if the style is already set for the HWND. 97 if (!(ex_style & WS_EX_LAYOUTRTL)) { 98 ex_style |= WS_EX_LAYOUTRTL; 99 ::SetWindowLong(hwnd, GWL_EXSTYLE, ex_style); 100 101 // Right-to-left layout changes are not applied to the window immediately 102 // so we should make sure a WM_PAINT is sent to the window by invalidating 103 // the entire window rect. 104 ::InvalidateRect(hwnd, NULL, true); 105 } 106 } 107 108 bool IsLocaleSupportedByOS(const std::string& locale) { 109 // Block Amharic on Windows XP unless 'Abyssinica SIL' font is present. 110 // On Win XP, no Ethiopic/Amahric font is availabel out of box. We hard-coded 111 // 'Abyssinica SIL' in the resource bundle to use in the UI. Check 112 // for its presence to determine whether or not to support Amharic UI on XP. 113 return (base::win::GetVersion() >= base::win::VERSION_VISTA || 114 !LowerCaseEqualsASCII(locale, "am") || IsFontPresent(L"Abyssinica SIL")); 115 } 116 117 bool NeedOverrideDefaultUIFont(base::string16* override_font_family, 118 double* font_size_scaler) { 119 // This is rather simple-minded to deal with the UI font size 120 // issue for some Indian locales (ml, bn, hi) for which 121 // the default Windows fonts are too small to be legible. For those 122 // locales, IDS_UI_FONT_FAMILY is set to an actual font family to 123 // use while for other locales, it's set to 'default'. 124 125 // XP and Vista or later have different font size issues and 126 // we need separate ui font specifications. 127 int ui_font_family_id = IDS_UI_FONT_FAMILY; 128 int ui_font_size_scaler_id = IDS_UI_FONT_SIZE_SCALER; 129 if (base::win::GetVersion() < base::win::VERSION_VISTA) { 130 ui_font_family_id = IDS_UI_FONT_FAMILY_XP; 131 ui_font_size_scaler_id = IDS_UI_FONT_SIZE_SCALER_XP; 132 } 133 134 base::string16 ui_font_family = GetStringUTF16(ui_font_family_id); 135 int scaler100; 136 if (!base::StringToInt(l10n_util::GetStringUTF16(ui_font_size_scaler_id), 137 &scaler100)) 138 return false; 139 140 // We use the OS default in two cases: 141 // 1) The resource bundle has 'default' and '100' for font family and 142 // font scaler. 143 // 2) The resource bundle is not available for some reason and 144 // ui_font_family is empty. 145 if (ui_font_family == L"default" && scaler100 == 100 || 146 ui_font_family.empty()) 147 return false; 148 if (override_font_family && font_size_scaler) { 149 override_font_family->swap(ui_font_family); 150 *font_size_scaler = scaler100 / 100.0; 151 } 152 return true; 153 } 154 155 void AdjustUIFont(LOGFONT* logfont) { 156 double dpi_scale = gfx::GetDPIScale(); 157 if (gfx::Display::HasForceDeviceScaleFactor()) { 158 // If the scale is forced, we don't need to adjust it here. 159 dpi_scale = 1.0; 160 } 161 AdjustUIFontForDIP(dpi_scale, logfont); 162 } 163 164 void AdjustUIFontForDIP(float dpi_scale, LOGFONT* logfont) { 165 base::string16 ui_font_family = L"default"; 166 double ui_font_size_scaler = 1; 167 if (NeedOverrideDefaultUIFont(&ui_font_family, &ui_font_size_scaler) || 168 dpi_scale != 1) { 169 AdjustLogFont(ui_font_family, ui_font_size_scaler, dpi_scale, logfont); 170 } 171 } 172 173 void AdjustUIFontForWindow(HWND hwnd) { 174 base::string16 ui_font_family; 175 double ui_font_size_scaler; 176 if (NeedOverrideDefaultUIFont(&ui_font_family, &ui_font_size_scaler)) { 177 LOGFONT logfont; 178 if (GetObject(GetWindowFont(hwnd), sizeof(logfont), &logfont)) { 179 double dpi_scale = 1; 180 AdjustLogFont(ui_font_family, ui_font_size_scaler, dpi_scale, &logfont); 181 HFONT hfont = CreateFontIndirect(&logfont); 182 if (hfont) 183 SetWindowFont(hwnd, hfont, FALSE); 184 } 185 } 186 } 187 188 void OverrideLocaleWithUILanguageList() { 189 std::vector<base::string16> ui_languages; 190 if (base::win::i18n::GetThreadPreferredUILanguageList(&ui_languages)) { 191 std::vector<std::string> ascii_languages; 192 ascii_languages.reserve(ui_languages.size()); 193 std::transform(ui_languages.begin(), ui_languages.end(), 194 std::back_inserter(ascii_languages), &base::UTF16ToASCII); 195 override_locale_holder.Get().swap_value(&ascii_languages); 196 } else { 197 NOTREACHED() << "Failed to determine the UI language for locale override."; 198 } 199 } 200 201 const std::vector<std::string>& GetLocaleOverrides() { 202 return override_locale_holder.Get().value(); 203 } 204 205 } // namespace l10n_util 206
