Remove pikepdf < 0.3 compatibility shims since > 0.3.1 is now required

[ci skip]

docs/jbig2.rst

@@ -1,4 +1,4 @@
-Installing a JBIG2 encoder
+Installing the JBIG2 encoder
 ==========================
 
 Most Linux distributions do not include a JBIG2 encoder since JBIG2 encoding was patented for a long time. All known JBIG2 US patents have expired as of 2017, but it is possible that unknown patents exist.

docs/release_notes.rst

@@ -13,6 +13,11 @@ Note that it is licensed under GPLv3, so scripts that ``import ocrmypdf`` and ar
    find:    [^`]\#([0-9]{1,3})[^0-9]
    replace: `#$1 <https://github.com/jbarlow83/OCRmyPDF/issues/$1>`_
 
+v7.0.3
+------
+
+-   Fix issue `#284 <https://github.com/jbarlow83/OCRmyPDF/issues/284>`_, an error when parsing inline images that have are also image masks, by upgrading pikepdf to 0.3.1
+
 v7.0.2
 ------
 

setup.py

@@ -249,7 +249,7 @@ setup(
     install_requires=[
         'cffi >= 1.9.1',          # must be a setup and install requirement
         'img2pdf >= 0.2.4, < 0.4',       # pure Python, so track HEAD closely
-        'pikepdf >= 0.2.2, < 0.4',
+        'pikepdf >= 0.3.1, < 0.4',
         'Pillow >= 4.0.0, != 5.1.0 ; sys_platform == "darwin"',
                                   # Pillow < 4 has BytesIO/TIFF bug w/img2pdf 0.2.3
                                   # block 5.1.0, broken wheels

src/ocrmypdf/optimize.py

@@ -24,11 +24,6 @@ import sys
 from PIL import Image
 
 import pikepdf
-try:
-    from pikepdf import Null  # pikepdf <= 0.2.2
-except ImportError:
-    def Null():               # pikepdf > 0.2.2
-        return None
 
 from ._jobcontext import JobContext
 from . import leptonica
@@ -245,8 +240,7 @@ def transcode_jpegs(pike, jpegs, root, log, options):
         compdata = leptonica.CompressedData.open(opt_jpg)
         im_obj = pike.get_object(xref, 0)
         im_obj.write(
-            compdata.read(), pikepdf.Name('/DCTDecode'),
-            Null()
+            compdata.read(), filter=pikepdf.Name('/DCTDecode')
         )
 
 
@@ -286,7 +280,7 @@ def transcode_pngs(pike, pngs, root, log, options):
         if len(compdata) > int(im_obj.stream_dict.Length):
             continue  # If we produced a larger image, don't use
 
-        predictor = Null()
+        predictor = None
         if compdata.predictor > 0:
             predictor = pikepdf.Dictionary({'/Predictor': compdata.predictor})
 
@@ -309,7 +303,10 @@ def transcode_pngs(pike, pngs, root, log, options):
             elif compdata.spp == 4:
                 cs = pikepdf.Name('/DeviceCMYK')
         im_obj.ColorSpace = cs
-        im_obj.write(compdata.read(), pikepdf.Name('/FlateDecode'), predictor)
+        im_obj.write(
+            compdata.read(),
+            filter=pikepdf.Name('/FlateDecode'), decode_parms=predictor
+        )
 
 
 def optimize(