Make application font family names locale sensitive in X11

So that they will match the family names returned by
QFontDatabase::families. Because the family names returned
by FcFreeTypeQueryFace are not sorted with locale as the
names returned by FcFontList, we have to find out the
family name matching the system language in the former case.

Task-number: QTBUG-14269
Reviewed-by: Eskil

1 files changed, 21 insertions, 2 deletions

diff --git a/src/gui/text/qfontdatabase_x11.cpp b/src/gui/text/qfontdatabase_x11.cpp
index 635d2cf..c67558b 100644
--- a/src/gui/text/qfontdatabase_x11.cpp
+++ b/src/gui/text/qfontdatabase_x11.cpp
@@ -1018,6 +1018,13 @@ static void loadFontConfig()
     QFontDatabasePrivate *db = privateDb();
     FcFontSet  *fonts;
 
+    FcPattern *pattern = FcPatternCreate();
+    FcDefaultSubstitute(pattern);
+    FcChar8 *lang = 0;
+    if (FcPatternGetString(pattern, FC_LANG, 0, &lang) == FcResultMatch)
+        db->systemLang = QString::fromUtf8((const char *) lang);
+    FcPatternDestroy(pattern);
+
     QString familyName;
     FcChar8 *value = 0;
     int weight_value;
@@ -2037,6 +2044,7 @@ static void registerFont(QFontDatabasePrivate::ApplicationFont *fnt)
     int count = 0;
 
     QStringList families;
+    QFontDatabasePrivate *db = privateDb();
 
     FcPattern *pattern = 0;
     do {
@@ -2048,8 +2056,19 @@ static void registerFont(QFontDatabasePrivate::ApplicationFont *fnt)
         FcPatternDel(pattern, FC_FILE);
         FcPatternAddString(pattern, FC_FILE, (const FcChar8 *)fnt->fileName.toUtf8().constData());
 
-        FcChar8 *fam = 0;
-        if (FcPatternGetString(pattern, FC_FAMILY, 0, &fam) == FcResultMatch) {
+        FcChar8 *fam = 0, *familylang = 0;
+        int i, n = 0;
+        for (i = 0; ; i++) {
+            if (FcPatternGetString(pattern, FC_FAMILYLANG, i, &familylang) != FcResultMatch)
+                break;
+            QString familyLang = QString::fromUtf8((const char *) familylang);
+            if (familyLang.compare(db->systemLang, Qt::CaseInsensitive) == 0) {
+                n = i;
+                break;
+            }
+        }
+
+        if (FcPatternGetString(pattern, FC_FAMILY, n, &fam) == FcResultMatch) {
             QString family = QString::fromUtf8(reinterpret_cast<const char *>(fam));
             families << family;
         }