Use pthread_once() to guard the initialization of sPaletteConverter. This

changes the semantics slightly: Previously after a failed initialization
another invocation of InitializeDefault() could theoretically initialize the
converter. Since the only error conditions are out of memory and broken app
server connection, this shouldn't really matter, though.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34383 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/interface/ColorConversion.h

@@ -50,6 +50,10 @@ public:
 
 	static status_t InitializeDefault(bool useServer = false);
 
+private:
+	static void _InitializeDefaultAppServer();
+	static void _InitializeDefaultNoAppServer();
+
 private:
 	const color_map	*fColorMap;
 	color_map		*fOwnColorMap;