* Start sending "ImageNotFound" packet back to the client if we can't find an image

* This might stop some client's constant requests for unfound textures, which is a candidate for the memory leak
* If a texture is not found then the "Image not found" texture will now be displayed clientside
* If it works, this should resolve mantis 676
* Non texture image requests do not receive this packet yet
* This will require a prebuild

OpenSim/Region/Environment/Modules/TextureNotFoundSender.cs

@@ -0,0 +1,75 @@
+/*
+ * Created by SharpDevelop.
+ * User: caseyj
+ * Date: 25/02/2008
+ * Time: 21:30
+ * 
+ * To change this template use Tools | Options | Coding | Edit Standard Headers.
+ */
+
+using System;
+
+using libsecondlife;
+using libsecondlife.Packets;
+
+using OpenSim.Framework;
+using OpenSim.Region.Environment.Interfaces;
+
+namespace OpenSim.Region.Environment.Modules
+{
+    /// <summary>
+    /// Sends a 'texture not found' packet back to the client
+    /// </summary>
+    public class TextureNotFoundSender : ITextureSender
+    {
+        //private static readonly log4net.ILog m_log 
+        //    = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
+        
+        private LLUUID m_textureId;
+        private IClientAPI m_client;
+        
+        // See ITextureSender
+        public bool Sending 
+        { 
+            get { return false; }
+            set { m_sending = value; }
+        }
+                    
+        private bool m_sending = false;           
+
+        // See ITextureSender
+        public bool Cancel 
+        { 
+            get { return false; }
+            set { m_cancel = value; }
+        }
+                    
+        private bool m_cancel = false;      
+        
+        public TextureNotFoundSender(IClientAPI client, LLUUID textureID)
+        {
+            m_client = client;
+            m_textureId = textureID;
+        }
+        
+        // See ITextureSender
+        public void UpdateRequest(int discardLevel, uint packetNumber)
+        {
+            // Not need to implement since priority changes don't affect this operation
+        }
+        
+        // See ITextureSender
+        public bool SendTexturePacket()
+        {
+            //m_log.InfoFormat(
+            //    "[TEXTURE NOT FOUND SENDER]: Informing the client that texture {0} cannot be found", 
+            //    m_textureId);
+            
+            ImageNotInDatabasePacket notFound = new ImageNotInDatabasePacket();
+            notFound.ImageID.ID = m_textureId;
+            m_client.OutPacket(notFound, ThrottleOutPacketType.Unknown);
+            
+            return true;
+        }
+    }
+}