josch/img2pdf
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make pep8 compliant

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Johannes 'josch' Schauer 2018-08-01 22:28:44 +02:00
parent 9395b6fbbe
commit 198c98a5f9
Signed by: josch
GPG key ID: F2CBA5C78FBD83E1
2 changed files with 48 additions and 28 deletions
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44
src/img2pdf.py
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@ -277,7 +277,8 @@ if PY3:
@classmethod
def encode(cls, string, hextype=False):
if hextype:
return b'< ' + b' '.join(("%06x"%c).encode('ascii') for c in string) + b' >'
return b'< ' + b' '.join(
("%06x" % c).encode('ascii') for c in string) + b' >'
else:
try:
string = string.encode('ascii')
@ -292,7 +293,8 @@ else:
@classmethod
def encode(cls, string, hextype=False):
if hextype:
return b'< ' + b' '.join(("%06x"%c).encode('ascii') for c in string) + b' >'
return b'< ' + b' '.join(
("%06x" % c).encode('ascii') for c in string) + b' >'
else:
# This mimics exactely to what pdfrw does.
string = string.replace(b'\\', b'\\\\')
@ -393,8 +395,11 @@ class pdfdoc(object):
colorspace = PdfName.DeviceCMYK
elif color == Colorspace.P:
if self.with_pdfrw:
raise Exception("pdfrw does not support hex strings for palette image input, re-run with --without-pdfrw")
colorspace = [ PdfName.Indexed, PdfName.DeviceRGB, len(palette)-1, PdfString.encode(palette, hextype=True)]
raise Exception("pdfrw does not support hex strings for "
"palette image input, re-run with "
"--without-pdfrw")
colorspace = [PdfName.Indexed, PdfName.DeviceRGB, len(palette)-1,
PdfString.encode(palette, hextype=True)]
else:
raise UnsupportedColorspaceError("unsupported color space: %s"
% color.name)
@ -647,13 +652,14 @@ def get_imgmetadata(imgdata, imgformat, default_dpi, colorspace, rawdata=None):
ics = imgdata.mode
if ics in ["LA", "PA", "RGBA"]:
logging.warning("Image contains transparency which cannot be retained in PDF.")
logging.warning("Image contains transparency which cannot be retained "
"in PDF.")
logging.warning("img2pdf will not perform a lossy operation.")
logging.warning("You can remove the alpha channel using imagemagick:")
logging.warning(" $ convert input.png -background white -alpha remove -alpha off output.png")
logging.warning(" $ convert input.png -background white -alpha "
"remove -alpha off output.png")
raise Exception("Refusing to work on images with alpha channel")
# Since commit 07a96209597c5e8dfe785c757d7051ce67a980fb or release 4.1.0
# Pillow retrieves the DPI from EXIF if it cannot find the DPI in the JPEG
# header. In that case it can happen that the horizontal and vertical DPI
@ -694,7 +700,8 @@ def ccitt_payload_location_from_pil(img):
# If Pillow is passed an invalid compression argument it will ignore it;
# make sure the image actually got compressed.
if img.info['compression'] != 'group4':
raise ValueError("Image not compressed with CCITT Group 4 but with: %s" % img.info['compression'])
raise ValueError("Image not compressed with CCITT Group 4 but with: %s"
% img.info['compression'])
# Read the TIFF tags to find the offset(s) of the compressed data strips.
strip_offsets = img.tag_v2[TiffImagePlugin.STRIPOFFSETS]
@ -752,13 +759,15 @@ def parse_png(rawdata):
pngidat += rawdata[i:i+n]
elif rawdata[i-4:i] == b"PLTE":
for j in range(i, i+n, 3):
# with int.from_bytes() we would not have to prepend extra zeroes
# with int.from_bytes() we would not have to prepend extra
# zeroes
color, = struct.unpack('>I', b'\x00'+rawdata[j:j+3])
palette.append(color)
i += n
i += 12
return pngidat, palette
def read_images(rawdata, colorspace, first_frame_only=False):
im = BytesIO(rawdata)
im.seek(0)
@ -796,7 +805,8 @@ def read_images(rawdata, colorspace, first_frame_only=False):
if color == Colorspace['RGBA']:
raise JpegColorspaceError("jpeg can't have an alpha channel")
im.close()
return [(color, ndpi, imgformat, rawdata, imgwidthpx, imgheightpx, [], False)]
return [(color, ndpi, imgformat, rawdata, imgwidthpx, imgheightpx, [],
False)]
# We can directly embed the IDAT chunk of PNG images if the PNG is not
# interlaced
@ -810,7 +820,8 @@ def read_images(rawdata, colorspace, first_frame_only=False):
imgdata, imgformat, default_dpi, colorspace, rawdata)
pngidat, palette = parse_png(rawdata)
im.close()
return [(color, ndpi, imgformat, pngidat, imgwidthpx, imgheightpx, palette, False)]
return [(color, ndpi, imgformat, pngidat, imgwidthpx, imgheightpx,
palette, False)]
# We can directly copy the data out of a CCITT Group 4 encoded TIFF, if it
# only contains a single strip
@ -822,14 +833,16 @@ def read_images(rawdata, colorspace, first_frame_only=False):
if photo == 0:
inverted = True
elif photo != 1:
raise ValueError("unsupported photometric interpretation for group4 tiff: %d" % photo)
raise ValueError("unsupported photometric interpretation for "
"group4 tiff: %d" % photo)
color, ndpi, imgwidthpx, imgheightpx = get_imgmetadata(
imgdata, imgformat, default_dpi, colorspace, rawdata)
offset, length = ccitt_payload_location_from_pil(imgdata)
im.seek(offset)
rawdata = im.read(length)
im.close()
return [(color, ndpi, ImageFormat.CCITTGroup4, rawdata, imgwidthpx, imgheightpx, [], inverted)]
return [(color, ndpi, ImageFormat.CCITTGroup4, rawdata, imgwidthpx,
imgheightpx, [], inverted)]
# Everything else has to be encoded
@ -869,7 +882,8 @@ def read_images(rawdata, colorspace, first_frame_only=False):
logging.debug("Colorspace is OK: %s", color)
newimg = imgdata
else:
raise ValueError("unknown or unsupported colorspace: %s" % color.name)
raise ValueError("unknown or unsupported colorspace: %s"
% color.name)
# the PNG format does not support CMYK, so we fall back to normal
# compression
if color in [Colorspace.CMYK, Colorspace["CMYK;I"]]:
@ -1194,7 +1208,7 @@ def convert(*images, **kwargs):
try:
with open(img, "rb") as f:
rawdata = f.read()
except:
except Exception:
# whatever the exception is (string could contain NUL
# characters or the path could just not exist) it's not a file
# name so we now try treating it as raw image content

20
src/tests/__init__.py
View file

@ -592,13 +592,17 @@ def test_suite():
if imgprops.DecodeParms:
if orig_img.format == 'PNG':
pngidat, palette = img2pdf.parse_png(orig_imgdata)
elif orig_img.format == 'TIFF' and orig_img.info['compression'] == "group4":
offset, length = img2pdf.ccitt_payload_location_from_pil(orig_img)
elif orig_img.format == 'TIFF' \
and orig_img.info['compression'] == "group4":
offset, length = \
img2pdf.ccitt_payload_location_from_pil(
orig_img)
pngidat = orig_imgdata[offset:offset+length]
else:
pngbuffer = BytesIO()
orig_img.save(pngbuffer, format="png")
pngidat, palette = img2pdf.parse_png(pngbuffer.getvalue())
pngidat, palette = img2pdf.parse_png(
pngbuffer.getvalue())
self.assertEqual(zlib.decompress(pngidat), imgdata)
else:
colorspace = imgprops.ColorSpace
@ -610,17 +614,19 @@ def test_suite():
colorspace = 'CMYK'
else:
raise Exception("invalid colorspace")
im = Image.frombytes(colorspace, (int(imgprops.Width),
im = Image.frombytes(colorspace,
(int(imgprops.Width),
int(imgprops.Height)),
imgdata)
if orig_img.mode == '1':
self.assertEqual(im.tobytes(),
orig_img.convert("L").tobytes())
elif orig_img.mode not in ("RGB", "L", "CMYK", "CMYK;I"):
elif orig_img.mode not in ("RGB", "L", "CMYK",
"CMYK;I"):
self.assertEqual(im.tobytes(),
orig_img.convert("RGB").tobytes())
# the python-pil version 2.3.0-1ubuntu3 in Ubuntu does not
# have the close() method
# the python-pil version 2.3.0-1ubuntu3 in Ubuntu does
# not have the close() method
try:
im.close()
except AttributeError: