/usr/lib/python3/dist-packages/diffoscope/comparators/png.py is in diffoscope 93ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 | # -*- coding: utf-8 -*-
#
# diffoscope: in-depth comparison of files, archives, and directories
#
# Copyright © 2014-2015 Jérémy Bobbio <lunar@debian.org>
#
# diffoscope is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# diffoscope is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with diffoscope. If not, see <https://www.gnu.org/licenses/>.
import re
import logging
import subprocess
from diffoscope.config import Config
from diffoscope.tools import tool_required
from diffoscope.difference import Difference
from .image import pixel_difference, flicker_difference, same_size
from .utils.file import File
from .utils.command import Command
logger = logging.getLogger(__name__)
class Sng(Command):
@tool_required('sng')
def cmdline(self):
return ['sng']
def stdin(self):
return open(self.path, 'rb')
class PngFile(File):
DESCRIPTION = "PNG images"
FILE_TYPE_RE = re.compile(r'^PNG image data\b')
def compare_details(self, other, source=None):
sng_diff = Difference.from_command(Sng, self.path, other.path, source='sng')
differences = [sng_diff]
if sng_diff is not None and Config().compute_visual_diffs and \
same_size(self, other):
try:
logger.debug(
"Generating visual difference for %s and %s",
self.path,
other.path,
)
content_diff = Difference(
None,
self.path,
other.path,
source="Image content",
)
content_diff.add_visuals([
pixel_difference(self.path, other.path),
flicker_difference(self.path, other.path),
])
differences.append(content_diff)
except subprocess.CalledProcessError: # noqa
pass
return differences
|