qt: fix broken unicode chars on osx 10.10

- qt: avoid hard-coding font names

They may not contain all necessary characters for a language

- qt: fix broken unicode chars on osx 10.10

The default font changed again.

The real fix is to compile qt against a >= 10.8 sdk, but this is simple enough
to backport to 0.10 to avoid having to do that there.

Note: NSAppKitVersionNumber is a double and there's no official value for
NSAppKitVersionNumber10_10. Since == isn't reliable for doubles, use Apple's
guidelines for testing versions here:
https://developer.apple.com/library/mac/releasenotes/AppKit/RN-AppKit/

Chinese and Japanese fonts have been hard-coded as well, otherwise they fail to
show up at all.

- qt: fonts: allow SubstituteFonts to filter based on user's language

SubstituteFonts() has been moved to after app identification so that QSettings
are accessible.

Github-Pull: #5671
Rebased-From: 73cd4edb4f 52954e6efd f5ad78b34a

src/qt/bitcoin.cpp

@@ -89,17 +89,9 @@ static std::string Translate(const char* psz)
     return QCoreApplication::translate("bitcoin-core", psz).toStdString();
 }
 
-/** Set up translations */
-static void initTranslations(QTranslator &qtTranslatorBase, QTranslator &qtTranslator, QTranslator &translatorBase, QTranslator &translator)
+static QString GetLangTerritory()
 {
     QSettings settings;
-
-    // Remove old translators
-    QApplication::removeTranslator(&qtTranslatorBase);
-    QApplication::removeTranslator(&qtTranslator);
-    QApplication::removeTranslator(&translatorBase);
-    QApplication::removeTranslator(&translator);
-
     // Get desired locale (e.g. "de_DE")
     // 1) System default language
     QString lang_territory = QLocale::system().name();
@@ -109,6 +101,22 @@ static void initTranslations(QTranslator &qtTranslatorBase, QTranslator &qtTrans
         lang_territory = lang_territory_qsettings;
     // 3) -lang command line argument
     lang_territory = QString::fromStdString(GetArg("-lang", lang_territory.toStdString()));
+    return lang_territory;
+}
+
+/** Set up translations */
+static void initTranslations(QTranslator &qtTranslatorBase, QTranslator &qtTranslator, QTranslator &translatorBase, QTranslator &translator)
+{
+
+    // Remove old translators
+    QApplication::removeTranslator(&qtTranslatorBase);
+    QApplication::removeTranslator(&qtTranslator);
+    QApplication::removeTranslator(&translatorBase);
+    QApplication::removeTranslator(&translator);
+
+    // Get desired locale (e.g. "de_DE")
+    // 1) System default language
+    QString lang_territory = GetLangTerritory();
 
     // Convert to "de" only by truncating "_DE"
     QString lang = lang_territory;
@@ -498,8 +506,6 @@ int main(int argc, char *argv[])
     Q_INIT_RESOURCE(bitcoin);
     Q_INIT_RESOURCE(bitcoin_locale);
 
-    GUIUtil::SubstituteFonts();
-
     BitcoinApplication app(argc, argv);
 #if QT_VERSION > 0x050100
     // Generate high-dpi pixmaps
@@ -521,6 +527,7 @@ int main(int argc, char *argv[])
     QApplication::setOrganizationName(QAPP_ORG_NAME);
     QApplication::setOrganizationDomain(QAPP_ORG_DOMAIN);
     QApplication::setApplicationName(QAPP_APP_NAME_DEFAULT);
+    GUIUtil::SubstituteFonts(GetLangTerritory());
 
     /// 4. Initialization of translations, so that intro dialog is in user's language
     // Now that QSettings are accessible, initialize translations

src/qt/guiutil.cpp

@@ -67,6 +67,9 @@ static boost::filesystem::detail::utf8_codecvt_facet utf8;
 
 #if defined(Q_OS_MAC)
 extern double NSAppKitVersionNumber;
+#if !defined(NSAppKitVersionNumber10_8)
+#define NSAppKitVersionNumber10_8 1187
+#endif
 #if !defined(NSAppKitVersionNumber10_9)
 #define NSAppKitVersionNumber10_9 1265
 #endif
@@ -383,7 +386,7 @@ void openDebugLogfile()
         QDesktopServices::openUrl(QUrl::fromLocalFile(boostPathToQString(pathDebug)));
 }
 
-void SubstituteFonts()
+void SubstituteFonts(const QString& language)
 {
 #if defined(Q_OS_MAC)
 // Background:
@@ -393,12 +396,28 @@ void SubstituteFonts()
 // If this fallback is not properly loaded, some characters may fail to
 // render correctly.
 //
+// The same thing happened with 10.10. .Helvetica Neue DeskInterface is now default.
+//
 // Solution: If building with the 10.7 SDK or lower and the user's platform
 // is 10.9 or higher at runtime, substitute the correct font. This needs to
 // happen before the QApplication is created.
 #if defined(MAC_OS_X_VERSION_MAX_ALLOWED) && MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_8
-    if (floor(NSAppKitVersionNumber) >= NSAppKitVersionNumber10_9)
+    if (floor(NSAppKitVersionNumber) > NSAppKitVersionNumber10_8)
+    {
+        if (floor(NSAppKitVersionNumber) <= NSAppKitVersionNumber10_9)
+            /* On a 10.9 - 10.9.x system */
             QFont::insertSubstitution(".Lucida Grande UI", "Lucida Grande");
+        else
+        {
+            /* 10.10 or later system */
+            if (language == "zh_CN" || language == "zh_TW" || language == "zh_HK") // traditional or simplified Chinese
+              QFont::insertSubstitution(".Helvetica Neue DeskInterface", "Heiti SC");
+            else if (language == "ja") // Japanesee
+              QFont::insertSubstitution(".Helvetica Neue DeskInterface", "Songti SC");
+            else
+              QFont::insertSubstitution(".Helvetica Neue DeskInterface", "Lucida Grande");
+        }
+    }
 #endif
 #endif
 }

src/qt/guiutil.h

@@ -107,7 +107,7 @@ namespace GUIUtil
     void openDebugLogfile();
 
     // Replace invalid default fonts with known good ones
-    void SubstituteFonts();
+    void SubstituteFonts(const QString& language);
 
     /** Qt event filter that intercepts ToolTipChange events, and replaces the tooltip with a rich text
       representation if needed. This assures that Qt can word-wrap long tooltip messages.

src/qt/splashscreen.cpp

@@ -37,7 +37,7 @@ SplashScreen::SplashScreen(Qt::WindowFlags f, const NetworkStyle *networkStyle)
     QString copyrightText   = QChar(0xA9)+QString(" 2009-%1 ").arg(COPYRIGHT_YEAR) + QString(tr("The Bitcoin Core developers"));
     QString titleAddText    = networkStyle->getTitleAddText();
 
-    QString font            = "Arial";
+    QString font            = QApplication::font().toString();
 
     // load the bitmap for writing some text over it
     pixmap     = networkStyle->getSplashImage();