Simplified UTF-8 encoding procedure for X11 window title.

- Instead of first converting to a wide string and converting that to
  UTF-8, now convert to UTF-8 directly using sf::Utf32::toUtf8.
- Modify OS X sf::String to NSString helper to work for big-endian
  architectures (like OS X 10.5 on PowerPC) as well.

src/SFML/Window/Linux/WindowImplX11.cpp

@@ -322,9 +322,9 @@ void WindowImplX11::setTitle(const String& title)
     
     // Convert to UTF-8 encoding.
     std::basic_string<sf::Uint8> utf8Title;
-    std::wstring wideTitle = title.toWideString();    
-    sf::Utf8::fromWide(wideTitle.begin(), wideTitle.end(), std::back_inserter(utf8Title));
+    sf::Utf32::toUtf8(title.begin(), title.end(), std::back_inserter(utf8Title));
     
+    // Set the _NET_WM_NAME atom, which specifies a UTF-8 encoded window title.
     Atom wmName = XInternAtom(m_display, "_NET_WM_NAME", False);
     Atom useUtf8 = XInternAtom(m_display, "UTF8_STRING", False);
     XChangeProperty(m_display, m_window, wmName, useUtf8, 8,

src/SFML/Window/OSX/cpp_objc_conversion.mm

@@ -28,6 +28,7 @@
 ////////////////////////////////////////////////////////////
 #include <SFML/System/Utf.hpp>
 
+#import <Foundation/Foundation.h>
 #import <SFML/Window/OSX/cpp_objc_conversion.h>
 
 ////////////////////////////////////////////////////////////
@@ -45,7 +46,17 @@ NSString* sfStringToNSString(sf::String const& string)
 {
     sf::Uint32 length = string.getSize() * sizeof(sf::Uint32);
     const void* data = reinterpret_cast<const void*>(string.getData());
-    NSString* str = [[NSString alloc] initWithBytes:data length:length encoding:NSUTF32LittleEndianStringEncoding];
 
+    NSStringEncoding sfEncoding;
+    if (NSHostByteOrder() == NS_LittleEndian)
+    {
+        sfEncoding = NSUTF32LittleEndianStringEncoding;
+    }
+    else
+    {
+        sfEncoding = NSUTF32BigEndianStringEncoding;
+    }
+
+    NSString* str = [[NSString alloc] initWithBytes:data length:length encoding:sfEncoding];
     return str;
 }