--- a/nagslang/data.py	Sun Sep 01 14:21:13 2013 +0200
+++ b/nagslang/data.py	Sun Sep 01 14:36:18 2013 +0200
@@ -1,15 +1,12 @@
 '''Simple data loader module.
 
 Loads data files from the "data" directory shipped with a game.
-
-Enhancing this to handle caching etc. is left as an exercise for the reader.
-
-Note that pyglet users should probably just add the data directory to the
-pyglet.resource search path.
 '''
 
 import os
 
+import pygame
+
 data_py = os.path.abspath(os.path.dirname(__file__))
 data_dir = os.path.normpath(os.path.join(data_py, '..', 'data'))
 
@@ -28,3 +25,23 @@
     "mode" is passed as the second arg to open().
     '''
     return open(os.path.join(data_dir, filename), mode)
+
+
+IMAGES = {}
+MUTATED_IMAGES = {}
+
+
+def load_image(filename, mutators=()):
+    if filename not in IMAGES:
+        image = pygame.image.load(filepath(filename))
+        image = image.convert_alpha(pygame.display.get_surface())
+        IMAGES[filename] = image
+
+    key = (filename, mutators)
+    if key not in MUTATED_IMAGES:
+        image = IMAGES[filename]
+        for mutator in mutators:
+            image = mutator(image)
+        MUTATED_IMAGES[key] = image
+
+    return MUTATED_IMAGES[key]