git.cworth.org Git - apitrace/blob - scripts/snapdiff.py

   1 #!/usr/bin/env python
   2 ##########################################################################
   3 #
   4 # Copyright 2011 Jose Fonseca
   5 # Copyright 2008-2009 VMware, Inc.
   6 # All Rights Reserved.
   7 #
   8 # Permission is hereby granted, free of charge, to any person obtaining a copy
   9 # of this software and associated documentation files (the "Software"), to deal
  10 # in the Software without restriction, including without limitation the rights
  11 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12 # copies of the Software, and to permit persons to whom the Software is
  13 # furnished to do so, subject to the following conditions:
  14 #
  15 # The above copyright notice and this permission notice shall be included in
  16 # all copies or substantial portions of the Software.
  17 #
  18 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  21 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  24 # THE SOFTWARE.
  25 #
  26 ##########################################################################/
  27
  28
  29 '''Snapshot (image) comparison script.
  30 '''
  31
  32
  33 import sys
  34 import os.path
  35 import optparse
  36 import math
  37 import operator
  38
  39 from PIL import Image
  40 from PIL import ImageChops
  41 from PIL import ImageEnhance
  42 from PIL import ImageFilter
  43
  44
  45 thumb_size = 320, 320
  46
  47 gaussian_kernel = ImageFilter.Kernel((3, 3), [1, 2, 1, 2, 4, 2, 1, 2, 1], 16)
  48
  49 class Comparer:
  50     '''Image comparer.'''
  51
  52     def __init__(self, ref_image, src_image, alpha = False):
  53         if isinstance(ref_image, basestring):
  54             self.ref_im = Image.open(ref_image)
  55         else:
  56             self.ref_im = ref_image
  57
  58         if isinstance(src_image, basestring):
  59             self.src_im = Image.open(src_image)
  60         else:
  61             self.src_im = src_image
  62
  63         # Ignore
  64         if not alpha:
  65             self.ref_im = self.ref_im.convert('RGB')
  66             self.src_im = self.src_im.convert('RGB')
  67
  68         self.diff = ImageChops.difference(self.src_im, self.ref_im)
  69
  70     def size_mismatch(self):
  71         return self.ref_im.size != self.src_im.size
  72
  73     def write_diff(self, diff_image, fuzz = 0.05):
  74         # make a difference image similar to ImageMagick's compare utility
  75         mask = ImageEnhance.Brightness(self.diff).enhance(1.0/fuzz)
  76         mask = mask.convert('L')
  77
  78         lowlight = Image.new('RGB', self.src_im.size, (0xff, 0xff, 0xff))
  79         highlight = Image.new('RGB', self.src_im.size, (0xf1, 0x00, 0x1e))
  80         diff_im = Image.composite(highlight, lowlight, mask)
  81
  82         diff_im = Image.blend(self.src_im, diff_im, 0xcc/255.0)
  83         diff_im.save(diff_image)
  84
  85     def precision(self, filter=False):
  86         if self.size_mismatch():
  87             return 0.0
  88
  89         diff = self.diff
  90         if filter:
  91             diff = diff.filter(gaussian_kernel)
  92
  93         # See also http://effbot.org/zone/pil-comparing-images.htm
  94         h = diff.histogram()
  95         square_error = 0
  96         for i in range(1, 256):
  97             square_error += sum(h[i : 3*256: 256])*i*i
  98         rel_error = float(square_error*2 + 1) / float(self.diff.size[0]*self.diff.size[1]*3*255*255*2)
  99         bits = -math.log(rel_error)/math.log(2.0)
 100         return bits
 101
 102     def ae(self, fuzz = 0.05):
 103         # Compute absolute error
 104
 105         if self.size_mismatch():
 106             return sys.maxint
 107
 108         # TODO: this is approximate due to the grayscale conversion
 109         h = self.diff.convert('L').histogram()
 110         ae = sum(h[int(255 * fuzz) + 1 : 256])
 111         return ae
 112
 113
 114 def surface(html, image):
 115     if True:
 116         name, ext = os.path.splitext(image)
 117         thumb = name + '.thumb' + ext
 118         if os.path.exists(image) \
 119            and (not os.path.exists(thumb) \
 120                 or os.path.getmtime(thumb) < os.path.getmtime(image)):
 121             im = Image.open(image)
 122             im.thumbnail(thumb_size)
 123             im.save(thumb)
 124     else:
 125         thumb = image
 126     html.write('        <td><a href="%s"><img src="%s"/></a></td>\n' % (image, thumb))
 127
 128
 129 def is_image(path):
 130     name = os.path.basename(path)
 131     name, ext1 = os.path.splitext(name)
 132     name, ext2 = os.path.splitext(name)
 133     return ext1 in ('.png', '.bmp') and ext2 not in ('.diff', '.thumb')
 134
 135
 136 def find_images(prefix):
 137     if os.path.isdir(prefix):
 138         prefix_dir = prefix
 139     else:
 140         prefix_dir = os.path.dirname(prefix)
 141
 142     images = []
 143     for dirname, dirnames, filenames in os.walk(prefix_dir, followlinks=True):
 144         for filename in filenames:
 145             filepath = os.path.join(dirname, filename)
 146             if filepath.startswith(prefix) and is_image(filepath):
 147                 images.append(filepath[len(prefix):])
 148
 149     return images
 150
 151
 152 def main():
 153     global options
 154
 155     optparser = optparse.OptionParser(
 156         usage="\n\t%prog [options] <ref_prefix> <src_prefix>")
 157     optparser.add_option(
 158         '-o', '--output', metavar='FILE',
 159         type="string", dest="output", default='index.html',
 160         help="output filename [default: %default]")
 161     optparser.add_option(
 162         '-f', '--fuzz',
 163         type="float", dest="fuzz", default=0.05,
 164         help="fuzz ratio [default: %default]")
 165     optparser.add_option(
 166         '-a', '--alpha',
 167         action="store_true", dest="alpha", default=False,
 168         help="take alpha channel in consideration")
 169     optparser.add_option(
 170         '--overwrite',
 171         action="store_true", dest="overwrite", default=False,
 172         help="overwrite images")
 173     optparser.add_option(
 174         '--show-all',
 175         action="store_true", dest="show_all", default=False,
 176         help="show all images, including similar ones")
 177
 178     (options, args) = optparser.parse_args(sys.argv[1:])
 179
 180     if len(args) != 2:
 181         optparser.error('incorrect number of arguments')
 182
 183     ref_prefix = args[0]
 184     src_prefix = args[1]
 185
 186     ref_images = find_images(ref_prefix)
 187     src_images = find_images(src_prefix)
 188     images = list(set(ref_images).intersection(set(src_images)))
 189     images.sort()
 190
 191     if options.output:
 192         html = open(options.output, 'wt')
 193     else:
 194         html = sys.stdout
 195     html.write('<html>\n')
 196     html.write('  <body>\n')
 197     html.write('    <table border="1">\n')
 198     html.write('      <tr><th>File</th><th>%s</th><th>%s</th><th>&Delta;</th></tr>\n' % (ref_prefix, src_prefix))
 199     failures = 0
 200     for image in images:
 201         ref_image = ref_prefix + image
 202         src_image = src_prefix + image
 203         root, ext = os.path.splitext(src_image)
 204         delta_image = "%s.diff.png" % (root, )
 205         if os.path.exists(ref_image) and os.path.exists(src_image):
 206             print "Comparing %s and %s\n" % (ref_image, src_image)
 207             comparer = Comparer(ref_image, src_image, options.alpha)
 208             match = comparer.ae(fuzz=options.fuzz) == 0
 209             if match:
 210                 bgcolor = '#20ff20'
 211             else:
 212                 failures += 1
 213                 bgcolor = '#ff2020'
 214             html.write('      <tr>\n')
 215             html.write('        <td bgcolor="%s"><a href="%s">%s<a/></td>\n' % (bgcolor, ref_image, image))
 216             if not match or options.show_all:
 217                 if options.overwrite \
 218                    or not os.path.exists(delta_image) \
 219                    or (os.path.getmtime(delta_image) < os.path.getmtime(ref_image) \
 220                        and os.path.getmtime(delta_image) < os.path.getmtime(src_image)):
 221                     comparer.write_diff(delta_image, fuzz=options.fuzz)
 222                 surface(html, ref_image)
 223                 surface(html, src_image)
 224                 surface(html, delta_image)
 225             html.write('      </tr>\n')
 226             html.flush()
 227     html.write('    </table>\n')
 228     html.write('  </body>\n')
 229     html.write('</html>\n')
 230
 231     if failures:
 232         sys.exit(1)
 233
 234 if __name__ == '__main__':
 235     main()