[IMP] use PyPDF2 if possible

report_qweb_pdf_watermark/README.rst

@@ -8,6 +8,11 @@ Pdf watermark
 
 This module was written to add watermarks (backgrounds) to PDF reports. Because of the way wkhtmltopdf handles headers and footers in the current versions, it is quite impossible to have a background for the complete page using HTML and CSS. That is why this module inserts the image at the PDF level.
 
+Installation
+============
+
+This module works out of the box, but is faster if you install the python library PyPDF2.
+
 Usage
 =====
 

report_qweb_pdf_watermark/__manifest__.py

@@ -3,7 +3,7 @@
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 {
     "name": "Pdf watermark",
-    "version": "10.0.1.0.0",
+    "version": "10.0.1.0.1",
     "author": "Therp BV, "
               "Odoo Community Association (OCA)",
     "license": "AGPL-3",

report_qweb_pdf_watermark/models/report.py

@@ -3,16 +3,22 @@
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 from base64 import b64decode
 from logging import getLogger
-from pyPdf import PdfFileWriter, PdfFileReader
-from pyPdf.utils import PdfReadError
 from PIL import Image
 from StringIO import StringIO
-from odoo import api, models, tools
-from PIL import PdfImagePlugin # flake8: noqa
 
-# PdfImagePlugin must be loaded in order to work PNG to PDF transformation
+from pyPdf import PdfFileWriter, PdfFileReader
-# This issue is related to Pillow creation, as can be seen in its source code:
+from pyPdf.utils import PdfReadError
-# https://github.com/python-pillow/Pillow/blob/master/PIL/PdfImagePlugin.py
+try:
+    from PyPDF2 import PdfFileWriter, PdfFileReader  # pylint: disable=W0404
+    from PyPDF2.utils import PdfReadError  # pylint: disable=W0404
+except ImportError:
+    pass
+try:
+    # we need this to be sure PIL has loaded PDF support
+    from PIL import PdfImagePlugin  # noqa: F401
+except ImportError:
+    pass
+from odoo import api, models, tools
 
 logger = getLogger(__name__)