diff -r 125e120165aa -r 2562797ab3cf hedgewars/uLandUtils.pas
--- a/hedgewars/uLandUtils.pas	Thu Dec 04 20:15:03 2014 +0100
+++ b/hedgewars/uLandUtils.pas	Fri Dec 05 02:19:30 2014 +0100
@@ -2,9 +2,10 @@
 interface
 
 procedure ResizeLand(width, height: LongWord);
+procedure InitWorldEdges();
 
 implementation
-uses uUtils, uConsts, uVariables;
+uses uUtils, uConsts, uVariables, uTypes;
 
 procedure ResizeLand(width, height: LongWord);
 var potW, potH: LongInt;
@@ -31,4 +32,56 @@
     end;
 end;
 
+procedure InitWorldEdges();
+var cy, cx, lx, ly: LongInt;
+    found: boolean;
+begin
+playHeight:= LAND_HEIGHT;
+topY:= 0;
+
+lx:= LongInt(LAND_WIDTH) - 1;
+
+if WorldEdge = weNone then
+    begin
+    playWidth:= LAND_WIDTH;
+    leftX := 0;
+    rightX:= lx;
+    EXIT;
+    end;
+
+ly:= LongInt(LAND_HEIGHT) - 1;
+
+// find most left land pixels and set leftX accordingly
+found:= false;
+for cx:= 0 to lx do
+    begin
+    for cy:= ly downto 0 do
+        if Land[cy, cx] <> 0 then
+            begin
+            leftX:= max(0, cx - cWorldEdgeDist);
+            // break out of both loops
+            found:= true;
+            break;
+            end;
+    if found then break;
+    end;
+
+// find most right land pixels and set rightX accordingly
+found:= false;
+for cx:= lx downto 0 do
+    begin
+    for cy:= ly downto 0 do
+        if Land[cy, cx] <> 0 then
+            begin
+            rightX:= min(lx, cx + cWorldEdgeDist);
+            // break out of both loops
+            found:= true;
+            break;
+            end;
+    if found then break;
+    end;
+
+playWidth := rightX + 1 - leftX;
+end;
+
 end.