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executable file 245 lines (203 sloc) 8.384 kB
#!/usr/bin/env python
##########################################################################
#
# Copyright 2011 Jose Fonseca
# Copyright 2008-2009 VMware, Inc.
# All Rights Reserved.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
##########################################################################/
'''Snapshot (image) comparison script.
'''
import sys
import os.path
import optparse
import math
import operator
from PIL import Image
from PIL import ImageChops
from PIL import ImageEnhance
from PIL import ImageFilter
thumb_size = 320, 320
gaussian_kernel = ImageFilter.Kernel((3, 3), [1, 2, 1, 2, 4, 2, 1, 2, 1], 16)
class Comparer:
'''Image comparer.'''
def __init__(self, ref_image, src_image, alpha = False):
if isinstance(ref_image, basestring):
self.ref_im = Image.open(ref_image)
else:
self.ref_im = ref_image
if isinstance(src_image, basestring):
self.src_im = Image.open(src_image)
else:
self.src_im = src_image
# Ignore
if not alpha:
self.ref_im = self.ref_im.convert('RGB')
self.src_im = self.src_im.convert('RGB')
self.diff = ImageChops.difference(self.src_im, self.ref_im)
def size_mismatch(self):
return self.ref_im.size != self.src_im.size
def write_diff(self, diff_image, fuzz = 0.05):
# make a difference image similar to ImageMagick's compare utility
mask = ImageEnhance.Brightness(self.diff).enhance(1.0/fuzz)
mask = mask.convert('L')
lowlight = Image.new('RGB', self.src_im.size, (0xff, 0xff, 0xff))
highlight = Image.new('RGB', self.src_im.size, (0xf1, 0x00, 0x1e))
diff_im = Image.composite(highlight, lowlight, mask)
diff_im = Image.blend(self.src_im, diff_im, 0xcc/255.0)
diff_im.save(diff_image)
def precision(self, filter=False):
if self.size_mismatch():
return 0.0
diff = self.diff
if filter:
diff = diff.filter(gaussian_kernel)
# See also http://effbot.org/zone/pil-comparing-images.htm
h = diff.histogram()
square_error = 0
for i in range(1, 256):
square_error += sum(h[i : 3*256: 256])*i*i
rel_error = float(square_error*2 + 1) / float(self.diff.size[0]*self.diff.size[1]*3*255*255*2)
bits = -math.log(rel_error)/math.log(2.0)
return bits
def ae(self, fuzz = 0.05):
# Compute absolute error
if self.size_mismatch():
return sys.maxint
# TODO: this is approximate due to the grayscale conversion
h = self.diff.convert('L').histogram()
ae = sum(h[int(255 * fuzz) + 1 : 256])
return ae
def surface(html, image):
if True:
name, ext = os.path.splitext(image)
thumb = name + '.thumb' + ext
if os.path.exists(image) \
and (not os.path.exists(thumb) \
or os.path.getmtime(thumb) < os.path.getmtime(image)):
im = Image.open(image)
im.thumbnail(thumb_size)
im.save(thumb)
else:
thumb = image
html.write(' <td><a href="%s"><img src="%s"/></a></td>\n' % (image, thumb))
def is_image(path):
name = os.path.basename(path)
name, ext1 = os.path.splitext(name)
name, ext2 = os.path.splitext(name)
return ext1 in ('.png', '.bmp') and ext2 not in ('.diff', '.thumb')
def find_images(prefix):
if os.path.isdir(prefix):
prefix_dir = prefix
else:
prefix_dir = os.path.dirname(prefix)
images = []
for dirname, dirnames, filenames in os.walk(prefix_dir, followlinks=True):
for filename in filenames:
filepath = os.path.join(dirname, filename)
if filepath.startswith(prefix) and is_image(filepath):
images.append(filepath[len(prefix):])
return images
def main():
global options
optparser = optparse.OptionParser(
usage="\n\t%prog [options] <ref_prefix> <src_prefix>")
optparser.add_option(
'-v', '--verbose',
action="store_true", dest="verbose", default=False,
help="verbose output")
optparser.add_option(
'-o', '--output', metavar='FILE',
type="string", dest="output", default='index.html',
help="output filename [default: %default]")
optparser.add_option(
'-f', '--fuzz',
type="float", dest="fuzz", default=0.05,
help="fuzz ratio [default: %default]")
optparser.add_option(
'-a', '--alpha',
action="store_true", dest="alpha", default=False,
help="take alpha channel in consideration")
optparser.add_option(
'--overwrite',
action="store_true", dest="overwrite", default=False,
help="overwrite images")
optparser.add_option(
'--show-all',
action="store_true", dest="show_all", default=False,
help="show all images, including similar ones")
(options, args) = optparser.parse_args(sys.argv[1:])
if len(args) != 2:
optparser.error('incorrect number of arguments')
ref_prefix = args[0]
src_prefix = args[1]
ref_images = find_images(ref_prefix)
src_images = find_images(src_prefix)
images = list(set(ref_images).intersection(set(src_images)))
images.sort()
if options.output:
html = open(options.output, 'wt')
else:
html = sys.stdout
html.write('<html>\n')
html.write(' <body>\n')
html.write(' <table border="1">\n')
html.write(' <tr><th>File</th><th>%s</th><th>%s</th><th>&Delta;</th></tr>\n' % (ref_prefix, src_prefix))
failures = 0
for image in images:
ref_image = ref_prefix + image
src_image = src_prefix + image
root, ext = os.path.splitext(src_image)
delta_image = "%s.diff.png" % (root, )
if os.path.exists(ref_image) and os.path.exists(src_image):
if options.verbose:
sys.stdout.write('Comparing %s and %s ...' % (ref_image, src_image))
comparer = Comparer(ref_image, src_image, options.alpha)
match = comparer.ae(fuzz=options.fuzz) == 0
if match:
result = 'MATCH'
bgcolor = '#20ff20'
else:
result = 'MISMATCH'
failures += 1
bgcolor = '#ff2020'
if options.verbose:
sys.stdout.write(' %s\n' % (result,))
html.write(' <tr>\n')
html.write(' <td bgcolor="%s"><a href="%s">%s<a/></td>\n' % (bgcolor, ref_image, image))
if not match or options.show_all:
if options.overwrite \
or not os.path.exists(delta_image) \
or (os.path.getmtime(delta_image) < os.path.getmtime(ref_image) \
and os.path.getmtime(delta_image) < os.path.getmtime(src_image)):
comparer.write_diff(delta_image, fuzz=options.fuzz)
surface(html, ref_image)
surface(html, src_image)
surface(html, delta_image)
html.write(' </tr>\n')
html.flush()
html.write(' </table>\n')
html.write(' </body>\n')
html.write('</html>\n')
if failures:
sys.exit(1)
if __name__ == '__main__':
main()
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