Use SpriteLoader for frame exporting.

OpenRA.Game/FileFormats/R8Reader.cs

@@ -23,6 +23,7 @@ namespace OpenRA.FileFormats
 			public Size FrameSize { get; private set; }
 			public float2 Offset { get; private set; }
 			public byte[] Data { get; set; }
+			public bool DisableExportPadding { get { return true; } }
 
 			public R8Image(Stream s)
 			{

OpenRA.Game/FileFormats/ShpD2Reader.cs

@@ -30,6 +30,7 @@ namespace OpenRA.FileFormats
 			public Size FrameSize { get { return Size; } }
 			public float2 Offset { get { return float2.Zero; } }
 			public byte[] Data { get; set; }
+			public bool DisableExportPadding { get { return false; } }
 
 			public Frame(Stream s)
 			{

OpenRA.Game/FileFormats/ShpReader.cs

@@ -27,6 +27,7 @@ namespace OpenRA.FileFormats
 			public Size FrameSize { get { return reader.Size; } }
 			public float2 Offset { get { return float2.Zero; } }
 			public byte[] Data { get; set; }
+			public bool DisableExportPadding { get { return false; } }
 
 			public uint FileOffset;
 			public Format Format;

OpenRA.Game/FileFormats/ShpTSReader.cs

@@ -22,6 +22,7 @@ namespace OpenRA.FileFormats
 			public Size FrameSize { get; private set; }
 			public float2 Offset { get; private set; }
 			public byte[] Data { get; set; }
+			public bool DisableExportPadding { get { return false; } }
 
 			public readonly uint FileOffset;
 			public readonly byte Format;

OpenRA.Game/FileFormats/TmpTDReader.cs

@@ -20,6 +20,7 @@ namespace OpenRA.FileFormats
 		public Size FrameSize { get; private set; }
 		public float2 Offset { get { return float2.Zero; } }
 		public byte[] Data { get; set; }
+		public bool DisableExportPadding { get { return false; } }
 
 		public TmpTile(byte[] data, Size size)
 		{

OpenRA.Game/FileFormats/TmpTSReader.cs

@@ -21,6 +21,7 @@ namespace OpenRA.FileFormats
 		public Size FrameSize { get { return Size; } }
 		public float2 Offset { get { return float2.Zero; } }
 		public byte[] Data { get; set; }
+		public bool DisableExportPadding { get { return false; } }
 
 		public TmpTSTile(Stream s, Size size)
 		{

OpenRA.Game/Graphics/SpriteSource.cs

@@ -20,6 +20,7 @@ namespace OpenRA.Graphics
 		Size FrameSize { get; }
 		float2 Offset { get; }
 		byte[] Data { get; }
+		bool DisableExportPadding { get; }
 	}
 
 	public interface ISpriteSource