Allow threaded tile provisioning

This change virtualizes four key methods of QGeoTiledMappingManagerEngine,
that need to be reimplemented in order to be able to run tile provisioning
in a separate thread.
QGeoTileRequestManager is also now privately exported, as it has to be
used in those methods.
Finally the patch includes some minor cleanup in QGeoTileFetcher.

Change-Id: I3063263120f935f0cde54abf00bd1caa476ab215
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

1 files changed, 4 insertions, 6 deletions

diff --git a/src/location/maps/qgeotiledmappingmanagerengine_p.h b/src/location/maps/qgeotiledmappingmanagerengine_p.h
index a7b4b1d0..3455655f 100644
--- a/src/location/maps/qgeotiledmappingmanagerengine_p.h
+++ b/src/location/maps/qgeotiledmappingmanagerengine_p.h
@@ -82,19 +82,18 @@ public:
     QSize tileSize() const;
     int tileVersion() const;
 
-    void updateTileRequests(QGeoTiledMap *map,
+    virtual void updateTileRequests(QGeoTiledMap *map,
                             const QSet<QGeoTileSpec> &tilesAdded,
                             const QSet<QGeoTileSpec> &tilesRemoved);
 
     QAbstractGeoTileCache *tileCache();
-    QSharedPointer<QGeoTileTexture> getTileTexture(const QGeoTileSpec &spec);
-
+    virtual QSharedPointer<QGeoTileTexture> getTileTexture(const QGeoTileSpec &spec);
 
     QAbstractGeoTileCache::CacheAreas cacheHint() const;
 
 private Q_SLOTS:
-    void engineTileFinished(const QGeoTileSpec &spec, const QByteArray &bytes, const QString &format);
-    void engineTileError(const QGeoTileSpec &spec, const QString &errorString);
+    virtual void engineTileFinished(const QGeoTileSpec &spec, const QByteArray &bytes, const QString &format);
+    virtual void engineTileError(const QGeoTileSpec &spec, const QString &errorString);
 
 Q_SIGNALS:
     void tileError(const QGeoTileSpec &spec, const QString &errorString);
@@ -108,7 +107,6 @@ protected:
     void setTileCache(QAbstractGeoTileCache *cache);
 
     QGeoTiledMap::PrefetchStyle m_prefetchStyle;
-private:
     QGeoTiledMappingManagerEnginePrivate *d_ptr;
 
     Q_DECLARE_PRIVATE(QGeoTiledMappingManagerEngine)