If reusing dynamic textures, do not reuse small data length textures that fall below current viewer discard level 2 thresholds.

Viewer LL 3.3.4 and before sometimes fail to properly redisplay dynamic textures that have a small data length compared to pixel size when pulled from cache.
This appears to happen when the data length is smaller than the estimate discard level 2 size the viewer uses when making this GetTexture request.
This commit works around this by always regenerating dynamic textures that fall below this threshold rather than reusing them if ReuseDynamicTextures = true
This can be controlled by the [Textures] ReuseDynamicLowDataTextures config setting which defaults to false.

4 files changed, 125 insertions, 41 deletions

diff --git a/OpenSim/Region/CoreModules/Scripting/DynamicTexture/DynamicTextureModule.cs b/OpenSim/Region/CoreModules/Scripting/DynamicTexture/DynamicTextureModule.cs
index e09f1a9..1f340df 100644
--- a/OpenSim/Region/CoreModules/Scripting/DynamicTexture/DynamicTextureModule.cs
+++ b/OpenSim/Region/CoreModules/Scripting/DynamicTexture/DynamicTextureModule.cs
@@ -42,7 +42,7 @@ namespace OpenSim.Region.CoreModules.Scripting.DynamicTexture
 {
     public class DynamicTextureModule : IRegionModule, IDynamicTextureManager
     {
-//        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
 
         private const int ALL_SIDES = -1;
 
@@ -54,6 +54,17 @@ namespace OpenSim.Region.CoreModules.Scripting.DynamicTexture
         /// </summary>
         public bool ReuseTextures { get; set; }
 
+        /// <summary>
+        /// If false, then textures which have a low data size are not reused when ReuseTextures = true.
+        /// </summary>
+        /// <remarks>
+        /// LL viewers 3.3.4 and before appear to not fully render textures pulled from the viewer cache if those
+        /// textures have a relatively high pixel surface but a small data size.  Typically, this appears to happen
+        /// if the data size is smaller than the viewer's discard level 2 size estimate.  So if this is setting is
+        /// false, textures smaller than the calculation in IsSizeReuseable are always regenerated rather than reused
+        /// to work around this problem.</remarks>
+        public bool ReuseLowDataTextures { get; set; }
+
         private Dictionary<UUID, Scene> RegisteredScenes = new Dictionary<UUID, Scene>();
 
         private Dictionary<string, IDynamicTextureRender> RenderPlugins =
@@ -83,18 +94,17 @@ namespace OpenSim.Region.CoreModules.Scripting.DynamicTexture
         /// <summary>
         /// Called by code which actually renders the dynamic texture to supply texture data.
         /// </summary>
-        /// <param name="id"></param>
-        /// <param name="data"></param>
-        /// <param name="isReuseable">True if the data generated can be reused for subsequent identical requests</param>
-        public void ReturnData(UUID id, byte[] data, bool isReuseable)
+        /// <param name="updaterId"></param>
+        /// <param name="texture"></param>
+        public void ReturnData(UUID updaterId, IDynamicTexture texture)
         {
             DynamicTextureUpdater updater = null;
 
             lock (Updaters)
             {
-                if (Updaters.ContainsKey(id))
+                if (Updaters.ContainsKey(updaterId))
                 {
-                    updater = Updaters[id];
+                    updater = Updaters[updaterId];
                 }
             }
 
@@ -103,11 +113,16 @@ namespace OpenSim.Region.CoreModules.Scripting.DynamicTexture
                 if (RegisteredScenes.ContainsKey(updater.SimUUID))
                 {
                     Scene scene = RegisteredScenes[updater.SimUUID];
-                    UUID newTextureID = updater.DataReceived(data, scene);
+                    UUID newTextureID = updater.DataReceived(texture.Data, scene);
 
-                    if (ReuseTextures && isReuseable && !updater.BlendWithOldTexture)
+                    if (ReuseTextures
+                        && !updater.BlendWithOldTexture
+                        && texture.IsReuseable
+                        && (ReuseLowDataTextures || IsDataSizeReuseable(texture)))
+                    {
                         m_reuseableDynamicTextures.Store(
-                            GenerateReusableTextureKey(updater.BodyData, updater.Params), newTextureID);
+                            GenerateReusableTextureKey(texture.InputCommands, texture.InputParams), newTextureID);
+                    }
                 }
             }
 
@@ -123,6 +138,27 @@ namespace OpenSim.Region.CoreModules.Scripting.DynamicTexture
             }
         }
 
+        /// <summary>
+        /// Determines whether the texture is reuseable based on its data size.
+        /// </summary>
+        /// <remarks>
+        /// This is a workaround for a viewer bug where very small data size textures relative to their pixel size
+        /// are not redisplayed properly when pulled from cache.  The calculation here is based on the typical discard
+        /// level of 2, a 'rate' of 0.125 and 4 components (which makes for a factor of 0.5).
+        /// </remarks>
+        /// <returns></returns>
+        private bool IsDataSizeReuseable(IDynamicTexture texture)
+        {
+//            Console.WriteLine("{0} {1}", texture.Size.Width, texture.Size.Height);
+            int discardLevel2DataThreshold = (int)Math.Ceiling((texture.Size.Width >> 2) * (texture.Size.Height >> 2) * 0.5);
+
+//            m_log.DebugFormat(
+//                "[DYNAMIC TEXTURE MODULE]: Discard level 2 threshold {0}, texture data length {1}",
+//                discardLevel2DataThreshold, texture.Data.Length);
+
+            return discardLevel2DataThreshold < texture.Data.Length;
+        }
+
         public UUID AddDynamicTextureURL(UUID simID, UUID primID, string contentType, string url,
                                          string extraParams, int updateTimer)
         {
@@ -293,7 +329,10 @@ namespace OpenSim.Region.CoreModules.Scripting.DynamicTexture
         {
             IConfig texturesConfig = config.Configs["Textures"];
             if (texturesConfig != null)
+            {
                 ReuseTextures = texturesConfig.GetBoolean("ReuseDynamicTextures", false);
+                ReuseLowDataTextures = texturesConfig.GetBoolean("ReuseDynamicLowDataTextures", false);
+            }
 
             if (!RegisteredScenes.ContainsKey(scene.RegionInfo.RegionID))
             {
diff --git a/OpenSim/Region/CoreModules/Scripting/LoadImageURL/LoadImageURLModule.cs b/OpenSim/Region/CoreModules/Scripting/LoadImageURL/LoadImageURLModule.cs
index 2b3a0f2..45e6527 100644
--- a/OpenSim/Region/CoreModules/Scripting/LoadImageURL/LoadImageURLModule.cs
+++ b/OpenSim/Region/CoreModules/Scripting/LoadImageURL/LoadImageURLModule.cs
@@ -32,6 +32,7 @@ using System.Net;
 using Nini.Config;
 using OpenMetaverse;
 using OpenMetaverse.Imaging;
+using OpenSim.Region.CoreModules.Scripting.DynamicTexture;
 using OpenSim.Region.Framework.Interfaces;
 using OpenSim.Region.Framework.Scenes;
 using log4net;
@@ -73,12 +74,12 @@ namespace OpenSim.Region.CoreModules.Scripting.LoadImageURL
 //            return false;
 //        }
 
-        public byte[] ConvertUrl(string url, string extraParams)
+        public IDynamicTexture ConvertUrl(string url, string extraParams)
         {
             return null;
         }
 
-        public byte[] ConvertData(string bodyData, string extraParams)
+        public IDynamicTexture ConvertData(string bodyData, string extraParams)
         {
             return null;
         }
@@ -171,11 +172,11 @@ namespace OpenSim.Region.CoreModules.Scripting.LoadImageURL
 
         private void HttpRequestReturn(IAsyncResult result)
         {
-
             RequestState state = (RequestState) result.AsyncState;
             WebRequest request = (WebRequest) state.Request;
             Stream stream = null;
             byte[] imageJ2000 = new byte[0];
+            Size newSize = new Size(0, 0);
 
             try
             {
@@ -188,37 +189,43 @@ namespace OpenSim.Region.CoreModules.Scripting.LoadImageURL
                         try
                         {
                             Bitmap image = new Bitmap(stream);
-                            Size newsize;
 
                             // TODO: make this a bit less hard coded
                             if ((image.Height < 64) && (image.Width < 64))
                             {
-                                newsize = new Size(32, 32);
+                                newSize.Width = 32;
+                                newSize.Height = 32;
                             }
                             else if ((image.Height < 128) && (image.Width < 128))
                             {
-                                newsize = new Size(64, 64);
+                                newSize.Width = 64;
+                                newSize.Height = 64;
                             }
                             else if ((image.Height < 256) && (image.Width < 256))
                             {
-                                newsize = new Size(128, 128);
+                                newSize.Width = 128;
+                                newSize.Height = 128;
                             }
                             else if ((image.Height < 512 && image.Width < 512))
                             {
-                                newsize = new Size(256, 256);
+                                newSize.Width = 256;
+                                newSize.Height = 256;
                             }
                             else if ((image.Height < 1024 && image.Width < 1024))
                             {
-                                newsize = new Size(512, 512);
+                                newSize.Width = 512;
+                                newSize.Height = 512;
                             }
                             else
                             {
-                                newsize = new Size(1024, 1024);
+                                newSize.Width = 1024;
+                                newSize.Height = 1024;
                             }
 
-                            Bitmap resize = new Bitmap(image, newsize);
-
-                            imageJ2000 = OpenJPEG.EncodeFromImage(resize, true);
+                            using (Bitmap resize = new Bitmap(image, newSize))
+                            {
+                                imageJ2000 = OpenJPEG.EncodeFromImage(resize, true);
+                            }
                         } 
                         catch (Exception)
                         {
@@ -233,7 +240,6 @@ namespace OpenSim.Region.CoreModules.Scripting.LoadImageURL
             }
             catch (WebException)
             {
-                
             }
             finally
             {
@@ -243,10 +249,13 @@ namespace OpenSim.Region.CoreModules.Scripting.LoadImageURL
                 }
             }
 
-            m_log.DebugFormat("[LOADIMAGEURLMODULE] Returning {0} bytes of image data for request {1}",
+            m_log.DebugFormat("[LOADIMAGEURLMODULE]: Returning {0} bytes of image data for request {1}",
                                        imageJ2000.Length, state.RequestID);
 
-            m_textureManager.ReturnData(state.RequestID, imageJ2000, false);
+            m_textureManager.ReturnData(
+                state.RequestID,
+                new OpenSim.Region.CoreModules.Scripting.DynamicTexture.DynamicTexture(
+                    request.RequestUri, null, imageJ2000, newSize, false));
         }
 
         #region Nested type: RequestState
diff --git a/OpenSim/Region/CoreModules/Scripting/VectorRender/Tests/VectorRenderModuleTests.cs b/OpenSim/Region/CoreModules/Scripting/VectorRender/Tests/VectorRenderModuleTests.cs
index b50c0bd..41baccc 100644
--- a/OpenSim/Region/CoreModules/Scripting/VectorRender/Tests/VectorRenderModuleTests.cs
+++ b/OpenSim/Region/CoreModules/Scripting/VectorRender/Tests/VectorRenderModuleTests.cs
@@ -57,6 +57,7 @@ namespace OpenSim.Region.CoreModules.Scripting.VectorRender.Tests
 
             m_dtm = new DynamicTextureModule();
             m_dtm.ReuseTextures = reuseTextures;
+//            m_dtm.ReuseLowDataTextures = reuseTextures;
 
             m_vrm = new VectorRenderModule();
 
@@ -201,6 +202,7 @@ namespace OpenSim.Region.CoreModules.Scripting.VectorRender.Tests
         public void TestRepeatSameDrawReusingTexture()
         {
             TestHelpers.InMethod();
+//            TestHelpers.EnableLogging();
 
             string dtText = "PenColour BLACK; MoveTo 40,220; FontSize 32; Text Hello World;";
 
@@ -228,6 +230,46 @@ namespace OpenSim.Region.CoreModules.Scripting.VectorRender.Tests
             Assert.That(firstDynamicTextureID, Is.EqualTo(so.RootPart.Shape.Textures.GetFace(0).TextureID));
         }
 
+        /// <summary>
+        /// Test a low data dynamically generated texture such that it is treated as a low data texture that causes
+        /// problems for current viewers.
+        /// </summary>
+        /// <remarks>
+        /// As we do not set DynamicTextureModule.ReuseLowDataTextures = true in this test, it should not reuse the
+        /// texture
+        /// </remarks>
+        [Test]
+        public void TestRepeatSameDrawLowDataTexture()
+        {
+            TestHelpers.InMethod();
+//            TestHelpers.EnableLogging();
+
+            string dtText = "PenColour BLACK; MoveTo 40,220; FontSize 32; Text Hello World;";
+
+            SetupScene(true);
+            SceneObjectGroup so = SceneHelpers.AddSceneObject(m_scene);
+
+            m_dtm.AddDynamicTextureData(
+                m_scene.RegionInfo.RegionID,
+                so.UUID,
+                m_vrm.GetContentType(),
+                dtText,
+                "1024",
+                0);
+
+            UUID firstDynamicTextureID = so.RootPart.Shape.Textures.GetFace(0).TextureID;
+
+            m_dtm.AddDynamicTextureData(
+                m_scene.RegionInfo.RegionID,
+                so.UUID,
+                m_vrm.GetContentType(),
+                dtText,
+                "1024",
+                0);
+
+            Assert.That(firstDynamicTextureID, Is.Not.EqualTo(so.RootPart.Shape.Textures.GetFace(0).TextureID));
+        }
+
         [Test]
         public void TestRepeatSameDrawDifferentExtraParamsReusingTexture()
         {
diff --git a/OpenSim/Region/CoreModules/Scripting/VectorRender/VectorRenderModule.cs b/OpenSim/Region/CoreModules/Scripting/VectorRender/VectorRenderModule.cs
index 0e7051e..d82551e 100644
--- a/OpenSim/Region/CoreModules/Scripting/VectorRender/VectorRenderModule.cs
+++ b/OpenSim/Region/CoreModules/Scripting/VectorRender/VectorRenderModule.cs
@@ -35,6 +35,7 @@ using System.Net;
 using Nini.Config;
 using OpenMetaverse;
 using OpenMetaverse.Imaging;
+using OpenSim.Region.CoreModules.Scripting.DynamicTexture;
 using OpenSim.Region.Framework.Interfaces;
 using OpenSim.Region.Framework.Scenes;
 using log4net;
@@ -85,20 +86,14 @@ namespace OpenSim.Region.CoreModules.Scripting.VectorRender
 //            return lines.Any((str, r) => str.StartsWith("Image"));
 //        }
 
-        public byte[] ConvertUrl(string url, string extraParams)
+        public IDynamicTexture ConvertUrl(string url, string extraParams)
         {
             return null;
         }
 
-        public byte[] ConvertData(string bodyData, string extraParams)
+        public IDynamicTexture ConvertData(string bodyData, string 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);
+            return Draw(bodyData, extraParams);
         }
 
         public bool AsyncConvertUrl(UUID id, string url, string extraParams)
@@ -109,10 +104,7 @@ namespace OpenSim.Region.CoreModules.Scripting.VectorRender
         public bool AsyncConvertData(UUID id, string bodyData, string extraParams)
         {
             // XXX: This isn't actually being done asynchronously!
-            bool reuseable;
-            byte[] data = ConvertData(bodyData, extraParams, out reuseable);
-
-            m_textureManager.ReturnData(id, data, reuseable);
+            m_textureManager.ReturnData(id, ConvertData(bodyData, extraParams));
 
             return true;
         }
@@ -191,7 +183,7 @@ namespace OpenSim.Region.CoreModules.Scripting.VectorRender
 
         #endregion
 
-        private byte[] Draw(string data, string extraParams, out bool reuseable)
+        private IDynamicTexture Draw(string data, string extraParams)
         {
             // 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
@@ -334,6 +326,7 @@ namespace OpenSim.Region.CoreModules.Scripting.VectorRender
 
             Bitmap bitmap = null;
             Graphics graph = null;
+            bool reuseable = false;
 
             try
             {
@@ -396,7 +389,8 @@ namespace OpenSim.Region.CoreModules.Scripting.VectorRender
                         e.Message, e.StackTrace);
                 }
 
-                return imageJ2000;
+                return new OpenSim.Region.CoreModules.Scripting.DynamicTexture.DynamicTexture(
+                    data, extraParams, imageJ2000, new Size(width, height), reuseable);
             }
             finally
             {