if the dimension is too big, rasterized image can be too big. so we

limit the maximum of rasterized image to 4096 pixles.

XXX since the dimention can be different on each page, it is better to
call 'pdfinfo -f page_num -l page_num' to get the size of each page.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@29404 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/PDFDocument.py

@@ -161,9 +161,24 @@ class PDFDocument(Image, ConversionCacheMixin):
       text = ''
       content_information = self.getContentInformation()
       page_count = int(content_information.get('Pages', 0))
+      try:
+        # if the dimension is too big, rasterized image can be too
+        # big. so we limit the maximum of rasterized image to 4096
+        # pixles.
+        # XXX since the dimention can be different on each page, it is
+        # better to call 'pdfinfo -f page_num -l page_num' to get the
+        # size of each page.
+        max_size = 4096
+        size = content_information.get('Page size',
+                                       '%s x %s pts' % (max_size, max_size))
+        width = int(size.split(' ')[0])
+        height = int(size.split(' ')[2])
+        resolution = 72.0 * max_size / max(width, height)
+      except ValueError, ZeroDivisionError:
+        resolution = None
       for page_number in range(page_count):
         src_mimetype, png_data = self.convert(
-            'png', quality=100, resolution=300,
+            'png', quality=100, resolution=resolution,
             frame=page_number, display='identical')
         if not src_mimetype.endswith('png'):
           continue