Built out and cleaned up the Display class.

game/gbe/core.py

 class Display:
     def __init__(self, width=640, height=480):
         self._init = False
-        self._resolution = width, height
+        self._resolution = (width, height)
+        self._display_surface = None
+        self._display_flags = Display.FLAG_RESIZABLE | Display.FLAG_HWSURFACE | Display.FLAG_DOUBLEBUF
+
+    def _isFlagSet(self, flag):
+        return (self._display_flags & flag) == flag
 
     @property
     def surface(self):
 
     @property
     def width(self):
+        if self._display_surface is None:
+            return 0
         return self._resolution[0]
-
+    
     @property
     def height(self):
+        if self._display_surface is None:
+            return 0
         return self._resolution[1]
 
+    @property
+    def resolution(self):
+        if self._display_surface is None:
+            return (0,0)
+        return self._display_surface.get_size()
+
+    @property
+    def fullscreen(self):
+        return self._isFlagSet(Display.FLAG_FULLSCREEN)
+
+    @property
+    def double_buffered(self):
+        return self._isFlagSet(Display.FLAG_DOUBLEBUF)
+
+    @property
+    def resizable(self):
+        return self._isFlagSet(Display.FLAG_RESIZABLE)
+
+    @property
+    def no_frame(self):
+        return self._isFlagSet(Display.FLAG_NOFRAME)
+
+    @property
+    def opengl(self):
+        return self._isFlagSet(Display.FLAG_OPENGL)
+
+    def toggle_fullscreen(self):
+        if self._isFlagSet(Display.FLAG_FULLSCREEN):
+            self._display_flags ^= Display.FLAG_FULLSCREEN
+        else:
+            self._display_flags |= Display.FLAG_FULLSCREEN
+        self.set_mode(self._resolution, flags)
+
+    def set_mode(self, resolution, flags):
+        if (self._init == False):
+            self._init = True
+            pygame.init()
+        self._display_surface = pygame.display.set_mode(resolution, flags)
+        self._display_flags = self._display_surface.get_flags()
+        self._resolution = self._display_surface.get_size()
+        return self
+
     def init(self):
         if self._init == False:
             self._init = True
             pygame.init()
-            self._display_surface = pygame.display.set_mode(self._resolution, pygame.HWSURFACE | pygame.DOUBLEBUF)
+            self.set_mode(self._resolution, self._display_flags)
+        return self
 
     def close(self):
         pygame.quit()
 
+    FLAG_SWSURFACE = pygame.SWSURFACE
+    FLAG_HWSURFACE = pygame.HWSURFACE
+    FLAG_HWPALETTE = pygame.HWPALETTE
+    FLAG_DOUBLEBUF = pygame.DOUBLEBUF
+    FLAG_FULLSCREEN = pygame.FULLSCREEN
+    FLAG_OPENGL = pygame.OPENGL
+    FLAG_RESIZABLE = pygame.RESIZABLE
+    FLAG_NOFRAME = pygame.NOFRAME
+
+