1 files changed, 195 insertions, 0 deletions

diff --git a/OpenSim/Region/CoreModules/World/Terrain/FileLoaders/GenericSystemDrawing.cs b/OpenSim/Region/CoreModules/World/Terrain/FileLoaders/GenericSystemDrawing.cs
new file mode 100644
index 0000000..477c73c
--- /dev/null
+++ b/OpenSim/Region/CoreModules/World/Terrain/FileLoaders/GenericSystemDrawing.cs
@@ -0,0 +1,195 @@
+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the OpenSim Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+using System;
+using System.Drawing;
+using System.Drawing.Imaging;
+using System.IO;
+using OpenSim.Region.Framework.Interfaces;
+using OpenSim.Region.Framework.Scenes;
+
+namespace OpenSim.Region.CoreModules.World.Terrain.FileLoaders
+{
+    /// <summary>
+    /// A virtual class designed to have methods overloaded,
+    /// this class provides an interface for a generic image
+    /// saving and loading mechanism, but does not specify the
+    /// format. It should not be insubstantiated directly.
+    /// </summary>
+    public class GenericSystemDrawing : ITerrainLoader
+    {
+        #region ITerrainLoader Members
+
+        public string FileExtension
+        {
+            get { return ".gsd"; }
+        }
+
+        /// <summary>
+        /// Loads a file from a specified filename on the disk,
+        /// parses the image using the System.Drawing parsers
+        /// then returns a terrain channel. Values are
+        /// returned based on HSL brightness between 0m and 128m
+        /// </summary>
+        /// <param name="filename">The target image to load</param>
+        /// <returns>A terrain channel generated from the image.</returns>
+        public virtual ITerrainChannel LoadFile(string filename)
+        {
+            return LoadBitmap(new Bitmap(filename));
+        }
+
+        public ITerrainChannel LoadFile(string filename, int x, int y, int fileWidth, int fileHeight, int w, int h)
+        {
+            throw new NotImplementedException();
+        }
+
+        public virtual ITerrainChannel LoadStream(Stream stream)
+        {
+            return LoadBitmap(new Bitmap(stream));
+        }
+
+        protected virtual ITerrainChannel LoadBitmap(Bitmap bitmap)
+        {
+            ITerrainChannel retval = new TerrainChannel(bitmap.Width, bitmap.Height);
+
+            int x;
+            for (x = 0; x < bitmap.Width; x++)
+            {
+                int y;
+                for (y = 0; y < bitmap.Height; y++)
+                {
+                    retval[x, y] = bitmap.GetPixel(x, bitmap.Height - y - 1).GetBrightness() * 128;
+                }
+            }
+
+            return retval;
+        }
+
+        /// <summary>
+        /// Exports a file to a image on the disk using a System.Drawing exporter.
+        /// </summary>
+        /// <param name="filename">The target filename</param>
+        /// <param name="map">The terrain channel being saved</param>
+        public virtual void SaveFile(string filename, ITerrainChannel map)
+        {
+            Bitmap colours = CreateGrayscaleBitmapFromMap(map);
+
+            colours.Save(filename, ImageFormat.Png);
+        }
+
+        /// <summary>
+        /// Exports a stream using a System.Drawing exporter.
+        /// </summary>
+        /// <param name="stream">The target stream</param>
+        /// <param name="map">The terrain channel being saved</param>
+        public virtual void SaveStream(Stream stream, ITerrainChannel map)
+        {
+            Bitmap colours = CreateGrayscaleBitmapFromMap(map);
+
+            colours.Save(stream, ImageFormat.Png);
+        }
+
+        #endregion
+
+        public override string ToString()
+        {
+            return "SYS.DRAWING";
+        }
+
+        /// <summary>
+        /// Protected method, generates a grayscale 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 grayscale image</returns>
+        protected static Bitmap CreateGrayscaleBitmapFromMap(ITerrainChannel map)
+        {
+            Bitmap bmp = new Bitmap(map.Width, map.Height);
+
+            const int pallete = 256;
+
+            Color[] grays = new Color[pallete];
+            for (int i = 0; i < grays.Length; i++)
+            {
+                grays[i] = Color.FromArgb(i, i, 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] / 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)
+        {
+            Bitmap gradientmapLd = new Bitmap("defaultstripe.png");
+
+            int pallete = gradientmapLd.Height;
+
+            Bitmap bmp = new Bitmap(map.Width, map.Height);
+            Color[] 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]);
+                }
+            }
+            return bmp;
+        }
+    }
+}