/usr/lib/python3/dist-packages/diffoscope/comparators/gif.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 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 | # -*- coding: utf-8 -*-
#
# diffoscope: in-depth comparison of files, archives, and directories
#
# Copyright © 2017 Chris Lamb <lamby@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.tools import tool_required
from diffoscope.config import Config
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 Gifbuild(Command):
RE_FILTERS = (
re.compile(r'^# GIF information from'),
re.compile(r'^# End of .* dump'),
)
@tool_required('gifbuild')
def cmdline(self):
return ['gifbuild', '-d', self.path]
def filter(self, line):
if any(x.match(line.decode('utf-8')) for x in self.RE_FILTERS):
return b""
return line
@tool_required('identify')
def is_image_static(image):
try:
return subprocess.check_output((
'identify',
'-format', '%n',
image.path,
)) == b'1'
except subprocess.CalledProcessError:
return False
def can_compose_gif_images(image1, image2):
return same_size(image1, image2) and \
is_image_static(image1) and \
is_image_static(image2)
class GifFile(File):
DESCRIPTION = "GIF image files"
FILE_TYPE_RE = re.compile(r'^GIF image data\b')
def compare_details(self, other, source=None):
gifbuild_diff = Difference.from_command(
Gifbuild,
self.path,
other.path,
source="gifbuild",
)
differences = [gifbuild_diff]
if gifbuild_diff is not None and Config().compute_visual_diffs and \
can_compose_gif_images(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
|