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using System;
using System.Drawing;
using System.IO;
using System.Windows.Forms;

/* Dithering an image using the Floyd–Steinberg algorithm in C#
 * http://www.cyotek.com/blog/dithering-an-image-using-the-floyd-steinberg-algorithm-in-csharp
 *
 * Copyright © 2015 Cyotek Ltd.
 *
 * Licensed under the MIT License. See LICENSE.txt for the full text.
 */

namespace Cyotek.DitheringTest.Helpers
{
  internal static class ClipboardHelpers
  {
    #region Constants

    public const string PngFormat = "PNG";

    #endregion

    #region Static Methods

    public static Bitmap GetImage()
    {
      Bitmap result;

      // http://csharphelper.com/blog/2014/09/paste-a-png-format-image-with-a-transparent-background-from-the-clipboard-in-c/

      result = null;

      try
      {
        if (Clipboard.ContainsData(PngFormat))
        {
          object data;

          data = Clipboard.GetData(PngFormat);

          if (data != null)
          {
            Stream stream;

            stream = data as MemoryStream;

            if (stream == null)
            {
              byte[] buffer;

              buffer = data as byte[];

              if (buffer != null)
              {
                stream = new MemoryStream(buffer);
              }
            }

            if (stream != null)
            {
              result = Image.FromStream(stream).Copy();

              stream.Dispose();
            }
          }
        }

        if (result == null)
        {
          result = (Bitmap)Clipboard.GetImage();
        }
      }
      catch (Exception ex)
      {
        MessageBox.Show(string.Format("Failed to obtain image. {0}", ex.GetBaseException().Message), "Paste Image", MessageBoxButtons.OK, MessageBoxIcon.Error);
      }

      return result;
    }

    #endregion
  }
}