add a default "no scale" orthographic scaler implementation

Blarg.GameFramework/Blarg.GameFramework.csproj

@@ -182,6 +182,7 @@
     <Compile Include="IServiceLocator.cs" />
     <Compile Include="BasicGameApp.cs" />
     <Compile Include="Graphics\IOrthoPixelScaler.cs" />
+    <Compile Include="Graphics\NoScaleOrthoPixelScaler.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath32)\Microsoft\Portable\$(TargetFrameworkVersion)\Microsoft.Portable.CSharp.targets" />
   <ItemGroup>

Blarg.GameFramework/Graphics/NoScaleOrthoPixelScaler.cs

@@ -0,0 +1,31 @@
+using System;
+
+namespace Blarg.GameFramework.Graphics
+{
+	public class NoScaleOrthoPixelScaler : IOrthoPixelScaler
+	{
+		Rect _viewport;
+
+		public void Calculate(Rect viewport)
+		{
+			// no scaling whatsoever!
+			_viewport = viewport;
+		}
+
+		public int Scale
+		{
+			get { return 1; }
+		}
+
+		public int ScaledWidth
+		{
+			get { return _viewport.Width; }
+		}
+
+		public int ScaledHeight
+		{
+			get { return _viewport.Height; }
+		}
+	}
+}
+