Store the font's scalability in QFontEngine.

This is an enabler to fallback to native font rendering when using a
bitmap font in Qt Quick.

Task-number: QTBUG-32737
Change-Id: I6d841dd5ef54d78a00f7fab9d80e9c95ff7f7b98
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>

src/gui/text/qfontdatabase_qpa.cpp

@@ -184,6 +184,7 @@ QFontEngine *loadSingleEngine(int script,
     if (!engine) {
         engine = pfdb->fontEngine(def, QChar::Script(script), size->handle);
         if (engine) {
+            engine->smoothScalable = style->smoothScalable;
             QFontCache::Key key(def,script);
             QFontCache::instance()->instance()->insertEngine(key,engine);
         }

src/gui/text/qfontengine.cpp

@@ -208,7 +208,8 @@ Q_AUTOTEST_EXPORT QList<QFontEngine *> QFontEngine_stopCollectingEngines()
 QFontEngine::QFontEngine()
     : ref(0),
       font_(0), font_destroy_func(0),
-      face_(0), face_destroy_func(0)
+      face_(0), face_destroy_func(0),
+      smoothScalable(false)
 {
     cache_cost = 0;
     fsType = 0;

src/gui/text/qfontengine_p.h

@@ -302,6 +302,8 @@ public:
 
     inline QVariant userData() const { return m_userData; }
 
+    bool smoothScalable;
+
 protected:
     QFixed lastRightBearing(const QGlyphLayout &glyphs, bool round = false);