fix Character::UndemandGraphics unloading graphics too early if used

by multiple screens at once

stepmania/src/Character.cpp

@@ -4,6 +4,10 @@
 #include "RageUtil.h"
 #include "RageTextureID.h"
 
+Character::Character()
+{
+	m_iPreloadRefcount = 0;
+}
 
 bool Character::Load( CString sCharDir )
 {
@@ -172,14 +176,20 @@ bool Character::Has2DElems()
 
 void Character::DemandGraphics()
 {
-	CString s = GetIconPath();
-	if( !s.empty() )
-		m_Preload.Load( s );
+	++m_iPreloadRefcount;
+	if( m_iPreloadRefcount == 1 )
+	{
+		CString s = GetIconPath();
+		if( !s.empty() )
+			m_Preload.Load( s );
+	}
 }
 
 void Character::UndemandGraphics()
 {
-	m_Preload.UnloadAll();
+	--m_iPreloadRefcount;
+	if( m_iPreloadRefcount == 0 )
+		m_Preload.UnloadAll();
 }
 
 // lua start

stepmania/src/Character.h

@@ -12,7 +12,7 @@ typedef lua_State Lua;
 class Character
 {
 public:
-//	Character();
+	Character();
 	~Character() { }
 
 	bool Load( CString sCharDir );	// return true if success
@@ -59,6 +59,7 @@ public:
 
 	CString	m_sAttacks[NUM_ATTACK_LEVELS][NUM_ATTACKS_PER_LEVEL];
 	RageTexturePreloader m_Preload;
+	int m_iPreloadRefcount;
 };
 
 #endif