eggification

[Portfolio.git] / Products / Portfolio / Extensions / difference.py

diff --git a/Products/Portfolio/Extensions/difference.py b/Products/Portfolio/Extensions/difference.py
new file mode 100755 (executable)
index 0000000..6606eff
--- /dev/null
+++ b/Products/Portfolio/Extensions/difference.py
@@ -0,0 +1,35 @@
+# -*- coding: utf-8 -*-
+############################################################
+# Copyright © 2005-2008  Benoît PIN <benoit.pin@ensmp.fr>  #
+# Plinn - http://plinn.org                                 #
+#                                                          #
+# This program is free software; you can redistribute it   #
+# and/or modify it under the terms of the Creative Commons #
+# "Attribution-Noncommercial 2.0 Generic"                  #
+# http://creativecommons.org/licenses/by-nc/2.0/           #
+############################################################
+
+"""
+
+
+"""
+from AccessControl import Unauthorized
+from PIL.Image import new as newImage, open as imgopen, composite
+from PIL.ImageChops import difference
+from cStringIO import StringIO
+
+def diffImage(self, image, image2, mask) :
+       iw, ih = image.size
+       if iw > 800 or ih > 800 :
+               raise Unauthorized, "You are not allowed to get an image larger than 800px"
+       
+       mask = imgopen(StringIO(str(mask)))
+       assert mask.mode=='L', "mask must be in L mode"
+       
+       image2 = imgopen(StringIO(str(image2)))
+       diffImage = difference(image, image2)
+       mergedImage = composite(diffImage, image, mask)
+       
+       box = (0,0) + mergedImage.size
+       
+       image.paste(mergedImage, box)