linux-packaging-mono/mcs/class/System.Drawing/System.Drawing/BufferedGraphics.cs

//
// Copyright (C) 2005 Novell, Inc (http://www.novell.com)
//
// 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.
//
// Authors:
//
//   Jordi Mas i Hernadez <jordimash@gmail.com>
//
//


using System.ComponentModel;
using System.Runtime.InteropServices;
using System.Runtime.Serialization;

namespace System.Drawing
{
	public sealed class BufferedGraphics : IDisposable
	{
		private Rectangle size;
		private Bitmap membmp = null;
		private Graphics target = null;
		private Graphics source = null;

		private BufferedGraphics ()
		{

		}

		internal BufferedGraphics (Graphics targetGraphics, Rectangle targetRectangle)
		{
			size = targetRectangle;
			target = targetGraphics;			
			membmp = new Bitmap (size.Width, size.Height);
		}

		~BufferedGraphics ()
		{
			Dispose (false);
		}

	      	public Graphics Graphics {
			get {
				if (source == null) {
					source = Graphics.FromImage (membmp);
				}

				return source;
			}
		}

	      	public void Dispose ()
		{
			Dispose (true);
			System.GC.SuppressFinalize (this);
		}

		private void Dispose (bool disposing)
		{
			if (disposing == false)
				return;

			if (membmp != null) {
				membmp.Dispose ();
				membmp = null;
			}

			if (source != null) {
				source.Dispose ();
				source = null;
			}

			target = null;
		}

	      	public void Render ()
		{
			Render (target);
		}

	      	public void Render (Graphics target)
		{
			if (target == null)
				return;

			target.DrawImage (membmp, size);
		}

		[MonoTODO ("The targetDC parameter has no equivalent in libgdiplus.")]
	      	public void Render (IntPtr targetDC)
		{
			throw new NotImplementedException ();
		}
	}
}