alpha_over warning will now only print once per run

composite.py

@@ -28,7 +28,7 @@ try:
     from _composite import alpha_over as _extension_alpha_over
     extension_alpha_over = _extension_alpha_over
 except ImportError:
-    logging.warning("alpha_over extension not found; using default PIL paste()")
+    pass
 
 def alpha_over(dest, src, pos_or_rect=(0, 0), mask=None):
     """Composite src over dest, using mask as the alpha channel (if

gmap.py

@@ -28,6 +28,7 @@ import multiprocessing
 import time
 import logging
 import optimizeimages
+import composite
 
 logging.basicConfig(level=logging.INFO,format="%(asctime)s [%(levelname)s] %(message)s")
 
@@ -118,6 +119,8 @@ def main():
     logging.info("Welcome to Minecraft Overviewer!")
     logging.debug("Current log level: {0}".format(logging.getLogger().level))
 
+    if not composite.extension_alpha_over:
+        logging.info("Notice: alpha_over extension not found; using default PIL paste()")
     
     useBiomeData = os.path.exists(os.path.join(worlddir, 'EXTRACTEDBIOMES'))
     if not useBiomeData: