Fix raw32 terrain heightmap reader so it estimates terrain size from

the size of the input stream. This is required since the raw heightmap
format (.r32) does not contain any size information.
The estimation relies on terrain being square.

OpenSim/Region/CoreModules/World/Terrain/FileLoaders/RAW32.cs

@@ -25,7 +25,10 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+using System;
 using System.IO;
+
+using OpenSim.Framework;
 using OpenSim.Region.Framework.Interfaces;
 using OpenSim.Region.Framework.Scenes;
 
@@ -116,7 +119,15 @@ namespace OpenSim.Region.CoreModules.World.Terrain.FileLoaders
 
         public ITerrainChannel LoadStream(Stream s)
         {
-            TerrainChannel retval = new TerrainChannel();
+            // The raw format doesn't contain any dimension information.
+            // Guess the square dimensions by using the length of the raw file.
+            double dimension = Math.Sqrt((double)(s.Length / 4));
+            // Regions are always multiples of 256.
+            int trimmedDimension = (int)dimension - ((int)dimension % (int)Constants.RegionSize);
+            if (trimmedDimension < Constants.RegionSize)
+                trimmedDimension = (int)Constants.RegionSize;
+
+            TerrainChannel retval = new TerrainChannel(trimmedDimension, trimmedDimension);
 
             BinaryReader bs = new BinaryReader(s);
             int y;

OpenSim/Region/CoreModules/World/Terrain/Tests/TerrainTest.cs

@@ -80,7 +80,7 @@ namespace OpenSim.Region.CoreModules.World.Terrain.Tests
             effect = new LowerSphere();
 
             effect.PaintEffect(map, allowMask, midRegion, midRegion, -1.0, 2, 6.0);
-            Assert.That(map[127, midRegion] >= 0.0, "Lower should not lowering value below 0.0 at this point (127,128).");
+            Assert.That(map[127, midRegion] >= 0.0, "Lower should not lowering value below 0.0 at this point (127,128).");
             Assert.That(map[127, midRegion] == 0.0, "Lower brush should lowering value to 0.0 at this point (127,128).");
             Assert.That(map[125, midRegion] < 1.0, "Lower brush should lowering value at this point (124,128).");
             Assert.That(map[120, midRegion] == 1.0, "Lower brush should not change value at this point (120,128).");

OpenSim/Region/Framework/Scenes/TerrainChannel.cs

@@ -217,6 +217,10 @@ namespace OpenSim.Region.Framework.Scenes
         // ITerrainChannel.Merge
         public void Merge(ITerrainChannel newTerrain, Vector3 displacement, float radianRotation, Vector2 rotationDisplacement)
         {
+            m_log.DebugFormat("{0} Merge. inSize=<{1},{2}>, disp={3}, rot={4}, rotDisp={5}, outSize=<{6},{7}>", LogHeader,
+                                        newTerrain.Width, newTerrain.Height,
+                                        displacement, radianRotation, rotationDisplacement,
+                                        m_terrainData.SizeX, m_terrainData.SizeY);
             for (int xx = 0; xx < newTerrain.Width; xx++)
             {
                 for (int yy = 0; yy < newTerrain.Height; yy++)