mono/mcs/class/System.Drawing/System.Drawing/ImageConverter.cs

//
// System.Drawing.ImageConverter.cs
//
// Author:
//   Dennis Hayes ([email protected])
//   Sanjay Gupta ([email protected])
//
// (C) 2002 Ximian, Inc
//

//
// Copyright (C) 2004 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.
//

using System;
using System.ComponentModel;
using System.Globalization;
using System.IO;
using System.Drawing.Imaging;

namespace System.Drawing
{
	/// <summary>
	/// Summary description for ImageConverter.
	/// </summary>
	public class ImageConverter : TypeConverter
	{		
		public ImageConverter ()
		{
		}
		
		public override bool CanConvertFrom (ITypeDescriptorContext context, Type srcType)
		{
			if (srcType == typeof (System.Byte[]))
				return true;
			else
				return false; 
		}

		public override bool CanConvertTo (ITypeDescriptorContext context, Type destType)
		{
			if ((destType == typeof (System.Byte[])) || (destType == typeof (System.String)))
				return true;
			else
				return false;
		}
		
		public override object ConvertFrom (ITypeDescriptorContext context, CultureInfo culture, object val)
		{
			byte [] bytes = val as byte [];
			if (bytes == null)
				return base.ConvertFrom (context, culture, val);
			
			MemoryStream ms = new MemoryStream (bytes);
			
			return Image.FromStream (ms);	
		}

		public override object ConvertTo (ITypeDescriptorContext context, CultureInfo culture, object val, Type destType)
		{
			if (val == null)
				return "(none)";

			if (val is System.Drawing.Image) {
				if (destType == typeof (string)) {
					return val.ToString ();
				} else if (CanConvertTo (null, destType)) {
					//came here means destType is byte array ;
					MemoryStream ms = new MemoryStream ();
					((Image)val).Save (ms, ((Image)val).RawFormat);
					return ms.GetBuffer ();
				}
			}

			string msg = Locale.GetText ("ImageConverter can not convert from type '{0}'.", val.GetType ());
			throw new NotSupportedException (msg);
		}

		public override PropertyDescriptorCollection GetProperties (ITypeDescriptorContext context, object val, Attribute[] attribs)
		{
			return TypeDescriptor.GetProperties (typeof (Image), attribs);
		}

		public override bool GetPropertiesSupported (ITypeDescriptorContext context )
		{
			return true; 
		}
	}
}