Added GDI-based rendering test

src/Artemis.Core/RGB.NET/DirectBitmap.cs

@@ -0,0 +1,52 @@
+using System;
+using System.Drawing;
+using System.Drawing.Imaging;
+using System.Runtime.InteropServices;
+
+namespace Artemis.Core.RGB.NET
+{
+    public class DirectBitmap : IDisposable
+    {
+        public Bitmap Bitmap { get; private set; }
+        public Int32[] Bits { get; private set; }
+        public bool Disposed { get; private set; }
+        public int Height { get; private set; }
+        public int Width { get; private set; }
+
+        protected GCHandle BitsHandle { get; private set; }
+
+        public DirectBitmap(int width, int height)
+        {
+            Width = width;
+            Height = height;
+            Bits = new Int32[width * height];
+            BitsHandle = GCHandle.Alloc(Bits, GCHandleType.Pinned);
+            Bitmap = new Bitmap(width, height, width * 4, PixelFormat.Format32bppPArgb, BitsHandle.AddrOfPinnedObject());
+        }
+
+        public void SetPixel(int x, int y, Color colour)
+        {
+            int index = x + (y * Width);
+            int col = colour.ToArgb();
+
+            Bits[index] = col;
+        }
+
+        public Color GetPixel(int x, int y)
+        {
+            int index = x + (y * Width);
+            int col = Bits[index];
+            Color result = Color.FromArgb(col);
+
+            return result;
+        }
+
+        public void Dispose()
+        {
+            if (Disposed) return;
+            Disposed = true;
+            Bitmap.Dispose();
+            BitsHandle.Free();
+        }
+    }
+}