New 3Q cache for map tiles, cleanup texture/tile resource management

Replaces the old use of QCache in QGeoTileCache with a new QCache3Q,
which is more optimal for many tile workloads. Resource management
for textures and tile data is now enforced and managed correctly
across threads. Textures are passed around as QSharedPointers to
guarantee that cache eviction policy will not interfere with the
correctness of rendering.

Change-Id: I93eb49ea3ad009d85f394f92c59a4b22962b88a7
Reviewed-by: Alex Wilson <alex.wilson@nokia.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/location/maps/qgeotilefetcher_p.h b/src/location/maps/qgeotilefetcher_p.h
index 659cc817..b18efadc 100644
--- a/src/location/maps/qgeotilefetcher_p.h
+++ b/src/location/maps/qgeotilefetcher_p.h
@@ -58,6 +58,8 @@
 #include <QMap>
 #include <QLocale>
 #include <QTimer>
+#include <QMutex>
+#include <QMutexLocker>
 #include <QHash>
 #include "qgeomaptype.h"
 
@@ -80,6 +82,7 @@ public:
     bool stopped_;
     bool initialized_;
     QTimer *timer_;
+    QMutex queueMutex_;
     QList<QGeoTileSpec> queue_;
     QHash<QGeoTileSpec, QGeoTiledMapReply*> invmap_;