Process FT_Xml as legacy actors

Everything from here on out is edge cases.

src/ActorUtil.cpp

@@ -37,6 +37,9 @@ void ActorUtil::Register( const RString& sClassName, CreateActorFn pfn )
 	(*g_pmapRegistrees)[sClassName] = pfn;
 }
 
+/* Resolves actor paths a la LoadActor("..."), with autowildcarding and .redir
+ * files.  Returns a path *within* the Rage filesystem, unlike the FILEMAN
+ * function of the same name. */
 bool ActorUtil::ResolvePath( RString &sPath, const RString &sName )
 {
 	CollapsePath( sPath );
@@ -311,10 +314,28 @@ Actor* ActorUtil::MakeActor( const RString &sPath_, Actor *pParentActor )
 			Actor *pRet = ActorUtil::LoadFromNode( pNode.get(), pParentActor );
 			return pRet;
 		}
+	case FT_Xml:
+		{
+			// Legacy actors; only supported in quirks mode
+			if ( !PREFSMAN->m_bQuirksMode )
+				return new Actor;
+
+			XNode xml;
+			if ( !XmlFileUtil::LoadFromFileShowErrors(xml, sPath) )
+				return new Actor;
+			XmlFileUtil::CompileXNodeTree( &xml, sPath );
+			XmlFileUtil::AnnotateXNodeTree( &xml, sPath );
+			return LoadFromNode( &xml, pParentActor );
+		}
 	case FT_Directory:
 		{
 			if( sPath.Right(1) != "/" )
 				sPath += '/';
+
+			RString sXml = sPath + "default.xml";
+			if (DoesFileExist(sXml))
+				return MakeActor(sXml, pParentActor);
+
 			XNode xml;
 			xml.AppendAttr( "Class", "BGAnimation" );
 			xml.AppendAttr( "AniDir", sPath );
@@ -491,6 +512,7 @@ FileType ActorUtil::GetFileType( const RString &sPath )
 	sExt.MakeLower();
 	
 	if( sExt=="lua" )		return FT_Lua;
+	else if(sExt=="xml")		return FT_Xml;
 	else if( 
 		sExt=="png" ||
 		sExt=="jpg" || 

src/Background.cpp

@@ -335,11 +335,19 @@ bool BackgroundImpl::Layer::CreateBackground( const Song *pSong, const Backgroun
 		case FT_Movie:
 			sEffect = SBE_StretchNormal;
 			break;
-		case FT_Directory:
 		case FT_Lua:
 		case FT_Model:
 			sEffect = SBE_UpperLeft;
 			break;
+		case FT_Xml:
+			sEffect = SBE_Centered;
+			break;
+		case FT_Directory:
+			if( DoesFileExist(vsResolved[0] + "/default.lua") )
+				sEffect = SBE_UpperLeft;
+			else
+				sEffect = SBE_Centered;
+			break;
 		}
 	}
 	ASSERT( !sEffect.empty() );

src/Foreground.cpp

@@ -2,6 +2,7 @@
 #include "Foreground.h"
 #include "RageUtil.h"
 #include "GameState.h"
+#include "PrefsManager.h"
 #include "RageTextureManager.h"
 #include "ActorUtil.h"
 #include "Song.h"
@@ -34,13 +35,18 @@ void Foreground::LoadFromSong( const Song *pSong )
 	{
 		const BackgroundChange &change = *bgc;
 		RString sBGName = change.m_def.m_sFile1,
-			sLuaFile = pSong->GetSongDir() + sBGName + "/default.lua";
+			sLuaFile = pSong->GetSongDir() + sBGName + "/default.lua",
+			sXmlFile = pSong->GetSongDir() + sBGName + "/default.xml";
 
 		LoadedBGA bga;
 		if ( DoesFileExist( sLuaFile ) )
 		{
 			bga.m_bga = ActorUtil::MakeActor( sLuaFile, this );
 		}
+		else if ( PREFSMAN->m_bQuirksMode && DoesFileExist( sXmlFile ) )
+		{
+			bga.m_bga = ActorUtil::MakeActor( sXmlFile, this );
+		}
 		else
 		{
 			bga.m_bga = ActorUtil::MakeActor( pSong->GetSongDir() + sBGName, this );