Made the supported image formats extendable, and supplied a SVG implementation right away with the jira addon.

GreenshotJiraPlugin/SvgImage.cs

@@ -0,0 +1,118 @@
+/*
+ * Greenshot - a free and open source screenshot tool
+ * Copyright (C) 2007-2016 Thomas Braun, Jens Klingen, Robin Krom
+ * 
+ * For more information see: http://getgreenshot.org/
+ * The Greenshot project is hosted on GitHub https://github.com/greenshot/greenshot
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 1 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+using System.Drawing;
+using System.Drawing.Imaging;
+using System.IO;
+using GreenshotPlugin.Core;
+using Svg;
+
+namespace GreenshotJiraPlugin
+{
+	/// <summary>
+	/// Create an image look like of the SVG
+	/// </summary>
+	public class SvgImage : IImage
+	{
+		private readonly SvgDocument _svgDocument;
+
+		private Image _imageClone;
+
+		/// <summary>
+		/// Factory to create via a stream
+		/// </summary>
+		/// <param name="stream">Stream</param>
+		/// <returns>IImage</returns>
+		public static IImage FromStream(Stream stream)
+		{
+			return new SvgImage(stream);
+		}
+
+		/// <summary>
+		/// Default constructor
+		/// </summary>
+		/// <param name="stream"></param>
+		public SvgImage(Stream stream)
+		{
+			_svgDocument = SvgDocument.Open<SvgDocument>(stream);
+			Height = (int)_svgDocument.ViewBox.Height;
+			Width = (int)_svgDocument.ViewBox.Width;
+		}
+
+		/// <summary>
+		/// Height of the image, can be set to change
+		/// </summary>
+		public int Height { get; set; }
+
+		/// <summary>
+		/// Width of the image, can be set to change.
+		/// </summary>
+		public int Width { get; set; }
+
+		/// <summary>
+		/// Size of the image
+		/// </summary>
+		public Size Size => new Size(Width, Height);
+
+		/// <summary>
+		/// Pixelformat of the underlying image
+		/// </summary>
+		public PixelFormat PixelFormat => Image.PixelFormat;
+
+		/// <summary>
+		/// Horizontal resolution of the underlying image
+		/// </summary>
+		public float HorizontalResolution => Image.HorizontalResolution;
+
+		/// <summary>
+		/// Vertical resolution of the underlying image
+		/// </summary>
+		public float VerticalResolution => Image.VerticalResolution;
+
+		/// <summary>
+		/// Unterlying image, or an on demand rendered version with different attributes as the original
+		/// </summary>
+		public Image Image
+		{
+			get
+			{
+				if (_imageClone?.Height == Height && _imageClone?.Width == Width)
+				{
+					return _imageClone;
+				}
+				// Calculate new image clone
+				_imageClone?.Dispose();
+				_imageClone = ImageHelper.CreateEmpty(Width, Height, PixelFormat.Format32bppArgb, Color.Transparent, 96, 96);
+				_svgDocument.Draw((Bitmap)_imageClone);
+				return _imageClone;
+
+			}
+		}
+
+		/// <summary>
+		/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
+		/// </summary>
+		public void Dispose()
+		{
+			_imageClone?.Dispose();
+		}
+	}
+}