Removed obsolete screenshot function.

src/OpenTK.GLControl/GLControl.cs

@@ -483,38 +483,6 @@ namespace OpenTK
 
         #endregion
 
-        #region public Bitmap GrabScreenshot()
-
-        /// <summary>
-        /// Grabs a screenshot of the frontbuffer contents.
-        /// When using multiple <c>GLControl</c>s, ensure that  <see cref="Context"/>
-        /// is current before accessing this property.
-        /// <seealso cref="Context"/>
-        /// <seealso cref="MakeCurrent"/>
-        /// </summary>
-        /// <returns>A System.Drawing.Bitmap, containing the contents of the frontbuffer.</returns>
-        /// <exception cref="OpenTK.Graphics.GraphicsContextException">
-        /// Occurs when no OpenTK.Graphics.GraphicsContext is current in the calling thread.
-        /// </exception>
-        [Obsolete("This method will not work correctly with OpenGL|ES. Please use GL.ReadPixels to capture the contents of the framebuffer (refer to http://www.opentk.com/doc/graphics/save-opengl-rendering-to-disk for more information).")]
-        public Bitmap GrabScreenshot()
-        {
-            ValidateState();
-            ValidateContext("GrabScreenshot()");
-
-            Bitmap bmp = new Bitmap(this.ClientSize.Width, this.ClientSize.Height);
-            System.Drawing.Imaging.BitmapData data =
-                bmp.LockBits(this.ClientRectangle, System.Drawing.Imaging.ImageLockMode.WriteOnly,
-                             System.Drawing.Imaging.PixelFormat.Format24bppRgb);
-            GL.ReadPixels(0, 0, this.ClientSize.Width, this.ClientSize.Height, PixelFormat.Bgr, PixelType.UnsignedByte,
-                          data.Scan0);
-            bmp.UnlockBits(data);
-            bmp.RotateFlip(RotateFlipType.RotateNoneFlipY);
-			return bmp;
-        }
-
-        #endregion
-
         #endregion
     }
 }