Allow the user to code his own ITextPrinterImplementation.

Source/Utilities/Fonts/IPrinterImplementation.cs

@@ -15,10 +15,31 @@ namespace OpenTK.Graphics
     /// <summary>
     /// Defines the interface for TextPrinter implementations.
     /// </summary>
-    interface ITextPrinterImplementation
+    public interface ITextPrinterImplementation
     {
-        TextHandle Load(Vector2[] vertices, ushort[] indices, int index_count);
+        /// <summary>
+        /// Caches a text fragment for future use.
+        /// </summary>
+        /// <param name="vertices">The vertex array for the text fragment.</param>
+        /// <param name="indices">The index array for the text fragment. Please use the indexCount parameter
+        /// instead of indices.Count, as the indices array may be larger than necessary for performance reasons.</param>
+        /// <param name="indexCount">The actual number of indices in the text fragment.</param>
+        /// <returns>A TextHandle that can be used to draw the text fragment.</returns>
+        TextHandle Load(Vector2[] vertices, ushort[] indices, int indexCount);
+
+        /// <summary>
+        /// Draws the specified cached text fragment.
+        /// </summary>
+        /// <param name="handle">The TextHandle corresponding to the desired text fragment.</param>
         void Draw(TextHandle handle);
-        void Draw(Vector2[] vertices, ushort[] indices, int index_count);
+
+        /// <summary>
+        /// Draws a text fragment, without caching.
+        /// </summary>
+        /// <param name="vertices">The vertex array for the text fragment.</param>
+        /// <param name="indices">The index array for the text fragment. Please use the indexCount parameter
+        /// instead of indices.Count, as the indices array may be larger than necessary for performance reasons.</param>
+        /// <param name="indexCount">The actual number of indices in the text fragment.</param>
+        void Draw(Vector2[] vertices, ushort[] indices, int indexCount);
     }
 }

Source/Utilities/Fonts/TextPrinter.cs

@@ -38,13 +38,20 @@ namespace OpenTK.Graphics
         Vector2[] vertices = new Vector2[8 * 8];
         ushort[] indices = new ushort[6 * 8];
 
-        #region --- Constructor ---
+        #region --- Constructors ---
 
         /// <summary>
         /// Constructs a new TextPrinter object.
         /// </summary>
         public TextPrinter() { }
 
+        public TextPrinter(ITextPrinterImplementation implementation)
+        {
+            if (implementation == null)
+                throw new ArgumentNullException("implementation");
+            printer = implementation;
+        }
+
         #endregion
 
         #region --- Private Members ---