Add map reduce feature for software drawing.

Now invisible tiles will be removed if this mode enabled.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/map.h b/src/map.h
index c8ce7918c..e33a9a35c 100644
--- a/src/map.h
+++ b/src/map.h
@@ -119,6 +119,8 @@ class TileAnimation
 class MapLayer: public ConfigListener
 {
     public:
+        friend class Map;
+
         /**
          * Constructor, taking layer origin, size and whether this layer is the
          * fringe layer. The fringe layer is the layer that draws the actors.
@@ -468,6 +470,8 @@ class Map : public Properties, public ConfigListener
         void setVersion(int n)
         { mVersion = n; }
 
+        void reduce();
+
     protected:
         friend class Actor;
         friend class Minimap;