From fe5807cd0972e015182a5e64d9ed8e7c77c4f271 Mon Sep 17 00:00:00 2001
From: UbitUmarov
Date: Sun, 20 Sep 2015 15:31:38 +0100
Subject:  fix terrain save greyscale mapping to 1:1 suporting standard 0-255m
 range and not only 0-127m. Jpeg format still using a non standard color
 encoded heightmap

---
 .../Terrain/FileLoaders/GenericSystemDrawing.cs    | 70 +++++-----------------
 1 file changed, 16 insertions(+), 54 deletions(-)

(limited to 'OpenSim/Region')

diff --git a/OpenSim/Region/CoreModules/World/Terrain/FileLoaders/GenericSystemDrawing.cs b/OpenSim/Region/CoreModules/World/Terrain/FileLoaders/GenericSystemDrawing.cs
index d5c77ec..c0b276a 100644
--- a/OpenSim/Region/CoreModules/World/Terrain/FileLoaders/GenericSystemDrawing.cs
+++ b/OpenSim/Region/CoreModules/World/Terrain/FileLoaders/GenericSystemDrawing.cs
@@ -128,7 +128,7 @@ namespace OpenSim.Region.CoreModules.World.Terrain.FileLoaders
             colours.Save(stream, ImageFormat.Png);
         }
 
-        public virtual void SaveFile(ITerrainChannel m_channel, string filename, 
+        public virtual void SaveFile(ITerrainChannel m_channel, string filename,
                                      int offsetX, int offsetY,
                                      int fileWidth, int fileHeight,
                                      int regionSizeX, int regionSizeY)
@@ -162,13 +162,13 @@ namespace OpenSim.Region.CoreModules.World.Terrain.FileLoaders
                 {
                     newBitmap = new Bitmap(fileWidth * regionSizeX, fileHeight * regionSizeY);
                 }
-    
+
                 thisBitmap = CreateGrayscaleBitmapFromMap(m_channel);
-    //            Console.WriteLine("offsetX=" + offsetX + " offsetY=" + offsetY);
+                //            Console.WriteLine("offsetX=" + offsetX + " offsetY=" + offsetY);
                 for (int x = 0; x < regionSizeX; x++)
                     for (int y = 0; y < regionSizeY; y++)
                         newBitmap.SetPixel(x + offsetX * regionSizeX, y + (fileHeight - 1 - offsetY) * regionSizeY, thisBitmap.GetPixel(x, y));
-    
+
                 Save(newBitmap, filename);
             }
             finally
@@ -227,59 +227,21 @@ namespace OpenSim.Region.CoreModules.World.Terrain.FileLoaders
             {
                 for (int x = 0; x < map.Width; x++)
                 {
-                    // 512 is the largest possible height before colours clamp
-                    int colorindex = (int) (Math.Max(Math.Min(1.0, map[x, y] / 128.0), 0.0) * (pallete - 1));
-
-                    // Handle error conditions
-                    if (colorindex > pallete - 1 || colorindex < 0)
-                        bmp.SetPixel(x, map.Height - y - 1, Color.Red);
-                    else
-                        bmp.SetPixel(x, map.Height - y - 1, grays[colorindex]);
-                }
-            }
-            return bmp;
-        }
-
-        /// <summary>
-        /// Protected method, generates a coloured bitmap
-        /// image from a specified terrain channel.
-        /// </summary>
-        /// <param name="map">The terrain channel to export to bitmap</param>
-        /// <returns>A System.Drawing.Bitmap containing a coloured image</returns>
-        protected static Bitmap CreateBitmapFromMap(ITerrainChannel map)
-        {
-            int pallete;
-            Bitmap bmp;
-            Color[] colours;
-
-            using (Bitmap gradientmapLd = new Bitmap("defaultstripe.png"))
-            {
-                pallete = gradientmapLd.Height;
-    
-                bmp = new Bitmap(map.Width, map.Height);
-                colours = new Color[pallete];
-    
-                for (int i = 0; i < pallete; i++)
-                {
-                    colours[i] = gradientmapLd.GetPixel(0, i);
-                }
-            }
-
-            for (int y = 0; y < map.Height; y++)
-            {
-                for (int x = 0; x < map.Width; x++)
-                {
-                    // 512 is the largest possible height before colours clamp
-                    int colorindex = (int) (Math.Max(Math.Min(1.0, map[x, y] / 512.0), 0.0) * (pallete - 1));
-
-                    // Handle error conditions
-                    if (colorindex > pallete - 1 || colorindex < 0)
-                        bmp.SetPixel(x, map.Height - y - 1, Color.Red);
-                    else
-                        bmp.SetPixel(x, map.Height - y - 1, colours[colorindex]);
+                    int colorindex = (int)map[x, y];  // one to one conversion as seems apparent on sl docs
+                    // or 0-511 range?
+                    // int colorindex = (int)map[x, y]/2;  // 0-511
+
+                    // clamp it not adding the red warning
+                    if (colorindex < 0)
+                        colorindex = 0;
+                    else if (colorindex >= pallete)
+                        colorindex = pallete - 1;
+                    bmp.SetPixel(x, map.Height - y - 1, grays[colorindex]);
                 }
             }
             return bmp;
         }
     }
 }
+
+    
-- 
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