[Image-SIG] crop is a little too lazy (with patch)

[Douglas Bagnall]

A cropped image does not return a pixel access object when load()ed.
This seems to be a simple oversight.

  >>> im = Image.new('L',(50,50))
  >>> im.load()
  <PixelAccess object at 0xb7d900f0>
  >>> im2 = im.crop((0, 0, 20, 20))
  >>> im2.load()
  None


There is an easy workaround:

  >>> im2.im.pixel_access()
  <PixelAccess object at 0xb7d900f0>

and the patch below cures the problem.

douglas

---------------------------------------------

--- Image-old.py        2007-09-24 13:19:30.000000000 +1200
+++ Image-new.py        2007-09-24 13:19:17.000000000 +1200
@@ -1666,6 +1666,8 @@
         if self.__crop:
             self.im = self.im.crop(self.__crop)
             self.__crop = None
+        if self.im:
+            return self.im.pixel_access(self.readonly)

         # FIXME: future versions should optimize crop/paste
         # sequences!