From c1cece4b82d24a17a09b66c9ec3975190cc05d95 Mon Sep 17 00:00:00 2001
From: Justin Clark-Casey (justincc)
Date: Tue, 28 Aug 2012 23:06:53 +0100
Subject: Add experimental DynamicTextureModule.ReuseTextures flag, currently
 only configurable on compile.

Disabled (status quo) by default.
This flag makes the dynamic texture module reuse cache previously dynamically generated textures given the same input commands and extra params for 24 hours.
This occurs as long as those commands would always generate the same texture (e.g. they do not contain commands to fetch data from the web).
This makes texture changing faster as a viewer-cached texture uuid is sent and may reduce simulator load in regions with generation of lots of dynamic textures.
A downside is that this stops expiry of old temporary dynamic textures from the cache,
Another downside is that a jpeg2000 generation that partially failed is currently not regenerated until restart or after 24 hours.
---
 .../Scripting/VectorRender/VectorRenderModule.cs   | 48 ++++++++++++++++++----
 1 file changed, 40 insertions(+), 8 deletions(-)

(limited to 'OpenSim/Region/CoreModules/Scripting/VectorRender/VectorRenderModule.cs')

diff --git a/OpenSim/Region/CoreModules/Scripting/VectorRender/VectorRenderModule.cs b/OpenSim/Region/CoreModules/Scripting/VectorRender/VectorRenderModule.cs
index 3a758c5..4268f2e 100644
--- a/OpenSim/Region/CoreModules/Scripting/VectorRender/VectorRenderModule.cs
+++ b/OpenSim/Region/CoreModules/Scripting/VectorRender/VectorRenderModule.cs
@@ -30,6 +30,7 @@ using System.Drawing;
 using System.Drawing.Imaging;
 using System.Globalization;
 using System.IO;
+using System.Linq;
 using System.Net;
 using Nini.Config;
 using OpenMetaverse;
@@ -73,6 +74,12 @@ namespace OpenSim.Region.CoreModules.Scripting.VectorRender
             return true;
         }
 
+//        public bool AlwaysIdenticalConversion(string bodyData, string extraParams)
+//        {
+//            string[] lines = GetLines(bodyData);
+//            return lines.Any((str, r) => str.StartsWith("Image"));
+//        }
+
         public byte[] ConvertUrl(string url, string extraParams)
         {
             return null;
@@ -80,7 +87,13 @@ namespace OpenSim.Region.CoreModules.Scripting.VectorRender
 
         public byte[] ConvertData(string bodyData, string extraParams)
         {
-            return Draw(bodyData, extraParams);
+            bool reuseable;
+            return Draw(bodyData, extraParams, out reuseable);
+        }
+
+        private byte[] ConvertData(string bodyData, string extraParams, out bool reuseable)
+        {
+            return Draw(bodyData, extraParams, out reuseable);
         }
 
         public bool AsyncConvertUrl(UUID id, string url, string extraParams)
@@ -91,7 +104,11 @@ namespace OpenSim.Region.CoreModules.Scripting.VectorRender
         public bool AsyncConvertData(UUID id, string bodyData, string extraParams)
         {
             // XXX: This isn't actually being done asynchronously!
-            m_textureManager.ReturnData(id, ConvertData(bodyData, extraParams));
+            bool reuseable;
+            byte[] data = ConvertData(bodyData, extraParams, out reuseable);
+
+            m_textureManager.ReturnData(id, data, reuseable);
+
             return true;
         }
 
@@ -162,7 +179,7 @@ namespace OpenSim.Region.CoreModules.Scripting.VectorRender
 
         #endregion
 
-        private byte[] Draw(string data, string extraParams)
+        private byte[] Draw(string data, string extraParams, out bool reuseable)
         {
             // We need to cater for old scripts that didnt use extraParams neatly, they use either an integer size which represents both width and height, or setalpha
             // we will now support multiple comma seperated params in the form  width:256,height:512,alpha:255
@@ -343,7 +360,7 @@ namespace OpenSim.Region.CoreModules.Scripting.VectorRender
                         }
                     }
         
-                    GDIDraw(data, graph, altDataDelim);
+                    GDIDraw(data, graph, altDataDelim, out reuseable);
                 }
     
                 byte[] imageJ2000 = new byte[0];
@@ -434,8 +451,21 @@ namespace OpenSim.Region.CoreModules.Scripting.VectorRender
         }
 */
 
-        private void GDIDraw(string data, Graphics graph, char dataDelim)
+        /// <summary>
+        /// Split input data into discrete command lines.
+        /// </summary>
+        /// <returns></returns>
+        /// <param name='data'></param>
+        /// <param name='dataDelim'></param>
+        private string[] GetLines(string data, char dataDelim)
         {
+            char[] lineDelimiter = { dataDelim };
+            return data.Split(lineDelimiter);
+        }
+
+        private void GDIDraw(string data, Graphics graph, char dataDelim, out bool reuseable)
+        {
+            reuseable = true;
             Point startPoint = new Point(0, 0);
             Point endPoint = new Point(0, 0);
             Pen drawPen = null;
@@ -450,11 +480,9 @@ namespace OpenSim.Region.CoreModules.Scripting.VectorRender
                 myFont = new Font(fontName, fontSize);
                 myBrush = new SolidBrush(Color.Black);
 
-                char[] lineDelimiter = {dataDelim};
                 char[] partsDelimiter = {','};
-                string[] lines = data.Split(lineDelimiter);
 
-                foreach (string line in lines)
+                foreach (string line in GetLines(data, dataDelim))
                 {
                     string nextLine = line.Trim();
                     //replace with switch, or even better, do some proper parsing
@@ -485,6 +513,10 @@ namespace OpenSim.Region.CoreModules.Scripting.VectorRender
                     }
                     else if (nextLine.StartsWith("Image"))
                     {
+                        // We cannot reuse any generated texture involving fetching an image via HTTP since that image
+                        // can change.
+                        reuseable = false;
+
                         float x = 0;
                         float y = 0;
                         GetParams(partsDelimiter, ref nextLine, 5, ref x, ref y);
-- 
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