[OpenTK] Disable custom MouseCursors

They require further development, due to byte-order differences between
platforms.

MouseCursor is now derived from WindowIcon, which we will use for
INativeWindow.Icon support in the future, in order to remove the
dependency to System.Drawing.

Source/OpenTK/MouseCursor.cs

@@ -31,10 +31,14 @@ using System;
 
 namespace OpenTK
 {
-
-    public class MouseCursor
+    /// <summary>
+    /// Represents a predefined or custom mouse cursor.
+    /// </summary>
+    public sealed class MouseCursor : WindowIcon
     {
         static readonly MouseCursor default_cursor = new MouseCursor();
+        static readonly MouseCursor empty_cursor = new MouseCursor(
+            new byte[16 * 16 * 4], 16, 16, 0, 0);
 
         byte[] rgba;
         int width;
@@ -46,7 +50,8 @@ namespace OpenTK
         {
         }
 
-        public MouseCursor(byte[] rgba, int width, int height, int x, int y)
+        // Todo: make public when byte-order issues are resolved
+        internal MouseCursor(byte[] rgba, int width, int height, int x, int y)
         {
             if (rgba == null)
                 throw new ArgumentNullException();
@@ -70,6 +75,9 @@ namespace OpenTK
         internal int X { get { return x; } }
         internal int Y { get { return y; } }
 
+        /// <summary>
+        /// Gets the default mouse cursor for this platform.
+        /// </summary>
         public static MouseCursor Default
         {
             get
@@ -77,6 +85,17 @@ namespace OpenTK
                 return default_cursor;
             }
         }
+
+        /// <summary>
+        /// Gets an empty (invisible) mouse cursor.
+        /// </summary>
+        public static MouseCursor Empty
+        {
+            get
+            {
+                return empty_cursor;
+            }
+        }
     }
 }
 

Source/OpenTK/OpenTK.csproj

@@ -795,6 +795,7 @@
       <SubType>Code</SubType>
     </Compile>
     <Compile Include="Platform\MacOS\Carbon\Cgl.cs" />
+    <Compile Include="WindowIcon.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <PropertyGroup>

Source/OpenTK/WindowIcon.cs

@@ -0,0 +1,45 @@
+#region License
+//
+// WindowIcon.cs
+//
+// Author:
+//       Stefanos A. <stapostol@gmail.com>
+//
+// Copyright (c) 2006-2014 Stefanos Apostolopoulos
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+#endregion
+
+using System;
+
+namespace OpenTK
+{
+    /// <summary>
+    /// Stores a window icon. A window icon is defined
+    /// as a 2-dimensional buffer of RGBA values.
+    /// </summary>
+    public class WindowIcon
+    {
+        internal protected WindowIcon()
+        {
+        }
+    }
+}
+