fixed screenshot causing crash in some resolutions

stepmania/src/RageDisplay.cpp

@@ -453,7 +453,7 @@ void RageDisplay::SaveScreenshot( CString sPath )
 	for( int y=0; y<g_CurrentHeight; y++ )
 		memcpy( 
 			(char *)temp->pixels + 3 * g_CurrentWidth * y,
-			(char *)image->pixels + 3 * g_CurrentWidth * (g_CurrentHeight-y),
+			(char *)image->pixels + 3 * g_CurrentWidth * (g_CurrentHeight-1-y),
 			3*g_CurrentWidth );
 
 	SDL_SaveBMP( temp, sPath );

stepmania/src/StepMania.cpp

@@ -94,10 +94,12 @@ void ApplyGraphicOptions()
 		PREFSMAN->m_iRefreshRate,
 		PREFSMAN->m_bVsync );
 
-	if(TEXTUREMAN->SetPrefs( PREFSMAN->m_iTextureColorDepth, PREFSMAN->m_iUnloadTextureDelaySeconds, PREFSMAN->m_iMaxTextureResolution ))
-		ReloadTextures = true;
+	bool bTexturesInvalidated = TEXTUREMAN->SetPrefs( 
+		PREFSMAN->m_iTextureColorDepth, 
+		PREFSMAN->m_iUnloadTextureDelaySeconds, 
+		PREFSMAN->m_iMaxTextureResolution );
 
-	if(ReloadTextures)
+	if( bTexturesInvalidated )
 		TEXTUREMAN->ReloadAll(); 
 }