macOS: Defer population of localized font family aliases until needed

Getting the localized family name of a font involves quite a bit of work
internally in CoreText, e.g. creating and sorting font descriptors.

By deferring population of family aliases until a font match misses
we shave off ~1 second of startup time for applications that use non-
localized font families (most applications).

Change-Id: I021952c311c0d70d7769ccf764dbf997ebf30a4b
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/platformsupport/fontdatabases/mac/qcoretextfontdatabase_p.h b/src/platformsupport/fontdatabases/mac/qcoretextfontdatabase_p.h
index a7529b7fb0..9612b909f1 100644
--- a/src/platformsupport/fontdatabases/mac/qcoretextfontdatabase_p.h
+++ b/src/platformsupport/fontdatabases/mac/qcoretextfontdatabase_p.h
@@ -75,7 +75,9 @@ public:
     QCoreTextFontDatabase();
     ~QCoreTextFontDatabase();
     void populateFontDatabase() Q_DECL_OVERRIDE;
+    bool populateFamilyAliases() override;
     void populateFamily(const QString &familyName) Q_DECL_OVERRIDE;
+    void invalidate() override;
 
     QStringList fallbacksForFamily(const QString &family, QFont::Style style, QFont::StyleHint styleHint, QChar::Script script) const Q_DECL_OVERRIDE;
     QStringList addApplicationFont(const QByteArray &fontData, const QString &fileName) Q_DECL_OVERRIDE;
@@ -96,6 +98,7 @@ private:
 
     mutable QSet<CTFontDescriptorRef> m_systemFontDescriptors;
     mutable QHash<QPlatformTheme::Font, QFont *> m_themeFonts;
+    bool m_hasPopulatedAliases;
 };
 
 // Split out into separate template class so that the compiler doesn't have