refactoring: reduce mapsforge memory usage

This puts scale and position into one overlay, instead of using 2
overlays. That reduces memory usage by 2 times a full screen bitmap due
to double buffering in mapsforge.

The only downside is that scale and position now have to be drawn at the
same depth-level (below or on top of the caches), but they were both on
top previously anyway.

1 files changed, 2 insertions, 5 deletions

diff --git a/main/src/cgeo/geocaching/maps/interfaces/MapViewImpl.java b/main/src/cgeo/geocaching/maps/interfaces/MapViewImpl.java
index 5481891..cb7ddc6 100644
--- a/main/src/cgeo/geocaching/maps/interfaces/MapViewImpl.java
+++ b/main/src/cgeo/geocaching/maps/interfaces/MapViewImpl.java
@@ -2,8 +2,7 @@ package cgeo.geocaching.maps.interfaces;
 
 import cgeo.geocaching.geopoint.Viewport;
 import cgeo.geocaching.maps.CachesOverlay;
-import cgeo.geocaching.maps.PositionOverlay;
-import cgeo.geocaching.maps.ScaleOverlay;
+import cgeo.geocaching.maps.PositionAndScaleOverlay;
 
 import android.app.Activity;
 import android.content.Context;
@@ -47,9 +46,7 @@ public interface MapViewImpl {
 
     CachesOverlay createAddMapOverlay(Context context, Drawable drawable);
 
-    ScaleOverlay createAddScaleOverlay(Activity activity);
-
-    PositionOverlay createAddPositionOverlay(Activity activity);
+    PositionAndScaleOverlay createAddPositionAndScaleOverlay(Activity activity);
 
     void setMapSource();