3 files changed, 13 insertions, 0 deletions
diff --git a/src/gui/text/qfontdatabase.cpp b/src/gui/text/qfontdatabase.cpp
index b8ac7efb6c..fbb7fe02d6 100644
--- a/src/gui/text/qfontdatabase.cpp
+++ b/src/gui/text/qfontdatabase.cpp
@@ -420,6 +420,7 @@ void QFontDatabasePrivate::invalidate()
 {
     QFontCache::instance()->clear();
     free();
+    QGuiApplicationPrivate::platformIntegration()->fontDatabase()->invalidate();
     emit static_cast<QGuiApplication *>(QCoreApplication::instance())->fontDatabaseChanged();
 }
 
diff --git a/src/gui/text/qplatformfontdatabase.cpp b/src/gui/text/qplatformfontdatabase.cpp
index 3049e0ab5e..5f277c878a 100644
--- a/src/gui/text/qplatformfontdatabase.cpp
+++ b/src/gui/text/qplatformfontdatabase.cpp
@@ -276,6 +276,16 @@ void QPlatformFontDatabase::populateFontDatabase()
 }
 
 /*!
+    This function is called whenever the font database is invalidated.
+
+    Reimplement this function to clear any internal data structures that
+    will need to be rebuilt at the next call to populateFontDatabase().
+*/
+void QPlatformFontDatabase::invalidate()
+{
+}
+
+/*!
     Returns a multi font engine in the specified \a script to encapsulate \a fontEngine with the
     option to fall back to the fonts given by \a fallbacks if \a fontEngine does not support
     a certain character.
diff --git a/src/gui/text/qplatformfontdatabase.h b/src/gui/text/qplatformfontdatabase.h
index 5f2c9a74ba..870480809b 100644
--- a/src/gui/text/qplatformfontdatabase.h
+++ b/src/gui/text/qplatformfontdatabase.h
@@ -96,6 +96,8 @@ class Q_GUI_EXPORT QPlatformFontDatabase
 public:
     virtual ~QPlatformFontDatabase();
     virtual void populateFontDatabase();
+    virtual void invalidate();
+
     virtual QFontEngineMulti *fontEngineMulti(QFontEngine *fontEngine, QChar::Script script);
     virtual QFontEngine *fontEngine(const QFontDef &fontDef, void *handle);
     virtual QStringList fallbacksForFamily(const QString &family, QFont::Style style, QFont::StyleHint styleHint, QChar::Script script) const;