1 files changed, 12 insertions, 3 deletions
diff --git a/src/platformsupport/fontdatabases/windows/qwindowsfontdatabase_ft.cpp b/src/platformsupport/fontdatabases/windows/qwindowsfontdatabase_ft.cpp
index 40d5749cf3..a6b7fcf31e 100644
--- a/src/platformsupport/fontdatabases/windows/qwindowsfontdatabase_ft.cpp
+++ b/src/platformsupport/fontdatabases/windows/qwindowsfontdatabase_ft.cpp
@@ -307,7 +307,7 @@ static bool addFontToDatabase(QString familyName,
 }
 
 static int QT_WIN_CALLBACK storeFont(const LOGFONT *logFont, const TEXTMETRIC *textmetric,
-                                     DWORD type, LPARAM)
+                                     DWORD type, LPARAM lparam)
 {
     const ENUMLOGFONTEX *f = reinterpret_cast<const ENUMLOGFONTEX *>(logFont);
     const QString faceName = QString::fromWCharArray(f->elfLogFont.lfFaceName);
@@ -318,8 +318,16 @@ static int QT_WIN_CALLBACK storeFont(const LOGFONT *logFont, const TEXTMETRIC *t
     // to the documentation is identical to a TEXTMETRIC except for the last four
     // members, which we don't use anyway
     const FONTSIGNATURE *signature = nullptr;
-    if (type & TRUETYPE_FONTTYPE)
+    if (type & TRUETYPE_FONTTYPE) {
         signature = &reinterpret_cast<const NEWTEXTMETRICEX *>(textmetric)->ntmFontSig;
+        // We get a callback for each script-type supported, but we register them all
+        // at once using the signature, so we only need one call to addFontToDatabase().
+        QSet<QPair<QString,QString>> *foundFontAndStyles = reinterpret_cast<QSet<QPair<QString,QString>> *>(lparam);
+        QPair<QString,QString> fontAndStyle(faceName, styleName);
+        if (foundFontAndStyles->contains(fontAndStyle))
+            return 1;
+        foundFontAndStyles->insert(fontAndStyle);
+    }
     addFontToDatabase(faceName, styleName, fullName, *logFont, textmetric, signature, type);
 
     // keep on enumerating
@@ -348,7 +356,8 @@ void QWindowsFontDatabaseFT::populateFamily(const QString &familyName)
     lf.lfFaceName[familyName.size()] = 0;
     lf.lfCharSet = DEFAULT_CHARSET;
     lf.lfPitchAndFamily = 0;
-    EnumFontFamiliesEx(dummy, &lf, storeFont, 0, 0);
+    QSet<QPair<QString,QString>> foundFontAndStyles;
+    EnumFontFamiliesEx(dummy, &lf, storeFont, reinterpret_cast<intptr_t>(&foundFontAndStyles), 0);
     ReleaseDC(0, dummy);
 }