Add: Unit Test metafile rendering

Create metafile rendering Unit Test based on Issue #210 from master.

Tests/Svg.UnitTests/MetafileRenderingTest.cs

+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Drawing;
+using System.Drawing.Imaging;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Xml;
+
+namespace Svg.UnitTests
+{
+
+    /// <summary>
+    /// Test Class of rendering SVGs as meterfile.
+    /// Based on Issue 210.
+    /// </summary>
+    /// <remarks>
+    /// Test use the following embedded resources:
+    ///   - Issue210_Metafile\3DSceneSnapshotBIG.svg
+    /// </remarks>
+    [TestClass]
+    public class MetafileRenderingTest : SvgTestHelper
+    {
+        protected override string TestResource { get { return GetFullResourceString("Issue210_Metafile.3DSceneSnapshotBIG.svg"); } }
+        protected override int ExpectedSize { get { return 12896; } }
+
+
+        [TestMethod]
+        [TestProperty(name: "speed", value: "slow")]
+        public void TestMetafileRendering()
+        {
+            LoadSvg(GetXMLDocFromResource());
+        }
+
+
+        protected override Image DrawSvg(SvgDocument svgDoc)
+        {
+            // GDI+
+            Metafile metafile;
+            using (var stream = new MemoryStream())
+            using (var img = new Bitmap((int)svgDoc.Width.Value, (int)svgDoc.Height.Value)) // Not necessary if you use Control.CreateGraphics().
+            using (Graphics ctrlGraphics = Graphics.FromImage(img)) // Control.CreateGraphics()
+            {
+                IntPtr handle = ctrlGraphics.GetHdc();
+
+                var rect = new RectangleF(0, 0, svgDoc.Width, svgDoc.Height);
+                metafile = new Metafile(stream,
+                    handle,
+                    rect,
+                    MetafileFrameUnit.Pixel,
+                    EmfType.EmfPlusOnly);
+
+                using (Graphics ig = Graphics.FromImage(metafile))
+                {
+                    svgDoc.Draw(ig);
+                }
+
+                ctrlGraphics.ReleaseHdc(handle);
+            }
+
+            return metafile;
+        }
+    }
+}

Tests/Svg.UnitTests/Svg.UnitTests.csproj

@@ -55,6 +55,7 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="CssQueryTest.cs" />
+    <Compile Include="MetafileRenderingTest.cs" />
     <Compile Include="MultiThreadingTest.cs" />
     <Compile Include="PrivateFontsTests.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
@@ -73,6 +74,9 @@
   <ItemGroup>
     <EmbeddedResource Include="Resources\Issue204_PrivateFont\Text.svg" />
   </ItemGroup>
+  <ItemGroup>
+    <EmbeddedResource Include="Resources\Issue210_Metafile\3DSceneSnapshotBIG.svg" />
+  </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.

Tests/Svg.UnitTests/SvgTestHelper.cs

@@ -184,23 +184,45 @@ namespace Svg.UnitTests
         protected virtual void LoadSvg(XmlDocument xml)
         {
             Trace.WriteLine("SvgDocument open xml.");
-            var svgDoc = SvgDocument.Open(xml);
+            var svgDoc = OpenSvg(xml);
             Trace.WriteLine("Done SvgDocument open xml.");
 
             Trace.WriteLine("Draw svg.");
-            var img = svgDoc.Draw();
+            var img = DrawSvg(svgDoc);
             Trace.WriteLine("Done drawing.");
 
             CheckSvg(svgDoc, img);
         }
 
 
+        /// <summary>
+        /// Open SVG document from XML document.
+        /// </summary>
+        /// <param name="xml">XML document.</param>
+        /// <returns>Open SVG document.</returns>
+        protected virtual SvgDocument OpenSvg(XmlDocument xml)
+        {
+            return SvgDocument.Open(xml);
+        }
+
+
+        /// <summary>
+        /// Draw SVG.
+        /// </summary>
+        /// <param name="svgDoc">SVG document to draw.</param>
+        /// <returns>SVG as image.</returns>
+        protected virtual Image DrawSvg(SvgDocument svgDoc)
+        {
+            return svgDoc.Draw();
+        }
+
+
         /// <summary>
         /// Check svg file data.
         /// </summary>
         /// <param name="svgDoc">Svg document.</param>
         /// <param name="img">Image of svg file from <paramref name="svgDoc"/>.</param>
-        protected virtual void CheckSvg(SvgDocument svgDoc, Bitmap img)
+        protected virtual void CheckSvg(SvgDocument svgDoc, Image img)
         {
             using (var ms = new MemoryStream())
             {