Make it possible to enable non-scalable font scaling

Windows native font engine supports scaling of non-scalalble fonts, so
make it possible to do so.
Added two functions to QPlatformFontDatabase: fontsAlwaysScalable() and
standardSizes(), and made fontsAlwaysScalable() to return true for
Windows native font database.

Windows Freetype font engine doesn't seem to support scaling of
non-scalable fonts, so didn't enable it in there.

Added implementation of standardSizes() for Mac OS.

Task-number: QTBUG-24970
Change-Id: I41c9356ede8a37b7c61db94340dbeb5b629f34b9
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>
Reviewed-by: Bradley T. Hughes <bradley.hughes@nokia.com>
Reviewed-by: Jiang Jiang <jiang.jiang@nokia.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/platformsupport/fontdatabases/mac/qcoretextfontdatabase_p.h b/src/platformsupport/fontdatabases/mac/qcoretextfontdatabase_p.h
index adcfeebf0b..556b176b07 100644
--- a/src/platformsupport/fontdatabases/mac/qcoretextfontdatabase_p.h
+++ b/src/platformsupport/fontdatabases/mac/qcoretextfontdatabase_p.h
@@ -58,6 +58,8 @@ public:
     QStringList addApplicationFont(const QByteArray &fontData, const QString &fileName);
     void releaseHandle(void *handle);
     QFont defaultFont() const;
+    QList<int> standardSizes() const;
+
 private:
     mutable QString defaultFontName;
     QHash<QFont::StyleHint, QStringList> fallbackLists;