l10n_util_win.cc revision 5d1f7b1de12d16ceb2c938c56701a3e8bfa558f7 
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
21namespace {
22
23void AdjustLogFont(const base::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
47bool 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
65class 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
77base::LazyInstance<OverrideLocaleHolder> override_locale_holder =
78    LAZY_INSTANCE_INITIALIZER;
79
80}  // namespace
81
82namespace l10n_util {
83
84int GetExtendedStyles() {
85  return !base::i18n::IsRTL() ? 0 : WS_EX_LAYOUTRTL | WS_EX_RTLREADING;
86}
87
88int GetExtendedTooltipStyles() {
89  return !base::i18n::IsRTL() ? 0 : WS_EX_LAYOUTRTL;
90}
91
92void 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
107bool 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
116bool NeedOverrideDefaultUIFont(base::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  base::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
154void 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
163void AdjustUIFontForDIP(float dpi_scale, LOGFONT* logfont) {
164  base::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
172void AdjustUIFontForWindow(HWND hwnd) {
173  base::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
187void 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
200const std::vector<std::string>& GetLocaleOverrides() {
201  return override_locale_holder.Get().value();
202}
203
204}  // namespace l10n_util
205