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#!/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
thumb_size = 320, 320
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 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):
# See also http://effbot.org/zone/pil-comparing-images.htm
h = self.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):
# Compute absolute error
# 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):
return \
path.endswith('.png') \
and not path.endswith('.diff.png') \
and not path.endswith('.thumb.png')
def find_images(prefix):
prefix = os.path.abspath(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>",
version="%%prog")
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(
'--overwrite',
action="store_true", dest="overwrite", default=False,
help="overwrite")
(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>%s</th><th>%s</th><th>Δ</th></tr>\n' % (ref_prefix, src_prefix))
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.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 = Comparer(ref_image, src_image)
comparer.write_diff(delta_image, fuzz=options.fuzz)
html.write(' <tr>\n')
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 __name__ == '__main__':
main()
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