/usr/lib/python2.7/test/test_imageop.py is in libpython2.7-testsuite 2.7.6-8.
This file is owned by root:root, with mode 0o755.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 | """Test script for the imageop module. This has the side
effect of partially testing the imgfile module as well.
Roger E. Masse
"""
from test.test_support import verbose, unlink, import_module, run_unittest
imageop = import_module('imageop', deprecated=True)
import uu, os, unittest
SIZES = (1, 2, 3, 4)
_VALUES = (1, 2, 2**10, 2**15-1, 2**15, 2**15+1, 2**31-2, 2**31-1)
VALUES = tuple( -x for x in reversed(_VALUES) ) + (0,) + _VALUES
AAAAA = "A" * 1024
MAX_LEN = 2**20
class InputValidationTests(unittest.TestCase):
def _check(self, name, size=None, *extra):
func = getattr(imageop, name)
for height in VALUES:
for width in VALUES:
strlen = abs(width * height)
if size:
strlen *= size
if strlen < MAX_LEN:
data = "A" * strlen
else:
data = AAAAA
if size:
arguments = (data, size, width, height) + extra
else:
arguments = (data, width, height) + extra
try:
func(*arguments)
except (ValueError, imageop.error):
pass
def check_size(self, name, *extra):
for size in SIZES:
self._check(name, size, *extra)
def check(self, name, *extra):
self._check(name, None, *extra)
def test_input_validation(self):
self.check_size("crop", 0, 0, 0, 0)
self.check_size("scale", 1, 0)
self.check_size("scale", -1, -1)
self.check_size("tovideo")
self.check("grey2mono", 128)
self.check("grey2grey4")
self.check("grey2grey2")
self.check("dither2mono")
self.check("dither2grey2")
self.check("mono2grey", 0, 0)
self.check("grey22grey")
self.check("rgb2rgb8") # nlen*4 == len
self.check("rgb82rgb")
self.check("rgb2grey")
self.check("grey2rgb")
def test_main():
run_unittest(InputValidationTests)
try:
import imgfile
except ImportError:
return
# Create binary test files
uu.decode(get_qualified_path('testrgb'+os.extsep+'uue'), 'test'+os.extsep+'rgb')
image, width, height = getimage('test'+os.extsep+'rgb')
# Return the selected part of image, which should by width by height
# in size and consist of pixels of psize bytes.
if verbose:
print 'crop'
newimage = imageop.crop (image, 4, width, height, 0, 0, 1, 1)
# Return image scaled to size newwidth by newheight. No interpolation
# is done, scaling is done by simple-minded pixel duplication or removal.
# Therefore, computer-generated images or dithered images will
# not look nice after scaling.
if verbose:
print 'scale'
scaleimage = imageop.scale(image, 4, width, height, 1, 1)
# Run a vertical low-pass filter over an image. It does so by computing
# each destination pixel as the average of two vertically-aligned source
# pixels. The main use of this routine is to forestall excessive flicker
# if the image two vertically-aligned source pixels, hence the name.
if verbose:
print 'tovideo'
videoimage = imageop.tovideo (image, 4, width, height)
# Convert an rgb image to an 8 bit rgb
if verbose:
print 'rgb2rgb8'
greyimage = imageop.rgb2rgb8(image, width, height)
# Convert an 8 bit rgb image to a 24 bit rgb image
if verbose:
print 'rgb82rgb'
image = imageop.rgb82rgb(greyimage, width, height)
# Convert an rgb image to an 8 bit greyscale image
if verbose:
print 'rgb2grey'
greyimage = imageop.rgb2grey(image, width, height)
# Convert an 8 bit greyscale image to a 24 bit rgb image
if verbose:
print 'grey2rgb'
image = imageop.grey2rgb(greyimage, width, height)
# Convert a 8-bit deep greyscale image to a 1-bit deep image by
# thresholding all the pixels. The resulting image is tightly packed
# and is probably only useful as an argument to mono2grey.
if verbose:
print 'grey2mono'
monoimage = imageop.grey2mono (greyimage, width, height, 0)
# monoimage, width, height = getimage('monotest.rgb')
# Convert a 1-bit monochrome image to an 8 bit greyscale or color image.
# All pixels that are zero-valued on input get value p0 on output and
# all one-value input pixels get value p1 on output. To convert a
# monochrome black-and-white image to greyscale pass the values 0 and
# 255 respectively.
if verbose:
print 'mono2grey'
greyimage = imageop.mono2grey (monoimage, width, height, 0, 255)
# Convert an 8-bit greyscale image to a 1-bit monochrome image using a
# (simple-minded) dithering algorithm.
if verbose:
print 'dither2mono'
monoimage = imageop.dither2mono (greyimage, width, height)
# Convert an 8-bit greyscale image to a 4-bit greyscale image without
# dithering.
if verbose:
print 'grey2grey4'
grey4image = imageop.grey2grey4 (greyimage, width, height)
# Convert an 8-bit greyscale image to a 2-bit greyscale image without
# dithering.
if verbose:
print 'grey2grey2'
grey2image = imageop.grey2grey2 (greyimage, width, height)
# Convert an 8-bit greyscale image to a 2-bit greyscale image with
# dithering. As for dither2mono, the dithering algorithm is currently
# very simple.
if verbose:
print 'dither2grey2'
grey2image = imageop.dither2grey2 (greyimage, width, height)
# Convert a 4-bit greyscale image to an 8-bit greyscale image.
if verbose:
print 'grey42grey'
greyimage = imageop.grey42grey (grey4image, width, height)
# Convert a 2-bit greyscale image to an 8-bit greyscale image.
if verbose:
print 'grey22grey'
image = imageop.grey22grey (grey2image, width, height)
# Cleanup
unlink('test'+os.extsep+'rgb')
def getimage(name):
"""return a tuple consisting of
image (in 'imgfile' format) width and height
"""
import imgfile
try:
sizes = imgfile.getsizes(name)
except imgfile.error:
name = get_qualified_path(name)
sizes = imgfile.getsizes(name)
if verbose:
print 'imgfile opening test image: %s, sizes: %s' % (name, str(sizes))
image = imgfile.read(name)
return (image, sizes[0], sizes[1])
def get_qualified_path(name):
""" return a more qualified path to name"""
import sys
import os
path = sys.path
try:
path = [os.path.dirname(__file__)] + path
except NameError:
pass
for dir in path:
fullname = os.path.join(dir, name)
if os.path.exists(fullname):
return fullname
return name
if __name__ == '__main__':
test_main()
|