Make asText method available on images

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@35235 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/Image.py

@@ -52,6 +52,9 @@ except ImportError:
     from zope.contenttype import guess_content_type
 from zLOG import LOG, WARNING
 
+# import mixin
+from Products.ERP5.mixin.text_convertable import TextConvertableMixin
+
 from Products.CMFCore.utils import getToolByName
 
 DEFAULT_DISPLAY_ID_LIST = ('nano', 'micro', 'thumbnail',
@@ -60,7 +63,7 @@ DEFAULT_DISPLAY_ID_LIST = ('nano', 'micro', 'thumbnail',
 
 DEFAULT_QUALITY = 75
 
-class Image(File, OFSImage):
+class Image(TextConvertableMixin, File, OFSImage):
   """
     An Image is a File which contains image data. It supports
     various conversions of format, size, resolution through