Python code coverage for Lib/test/test_imgfile.py

#	count	content
1	n/a	#! /usr/bin/env python
2	n/a
3	n/a	"""Simple test script for imgfile.c
4	n/a	Roger E. Masse
5	1	"""
6	n/a
7	1	from test.test_support import verbose, unlink, findfile, import_module
8	n/a
9	1	imgfile = import_module('imgfile', deprecated=True)
10	0	import uu
11	n/a
12	n/a
13	0	def testimage(name):
14	n/a	"""Run through the imgfile's battery of possible methods
15	n/a	on the image passed in name.
16	n/a	"""
17	n/a
18	0	import sys
19	0	import os
20	n/a
21	0	outputfile = '/tmp/deleteme'
22	n/a
23	n/a	# try opening the name directly
24	0	try:
25	n/a	# This function returns a tuple (x, y, z) where x and y are the size
26	n/a	# of the image in pixels and z is the number of bytes per pixel. Only
27	n/a	# 3 byte RGB pixels and 1 byte greyscale pixels are supported.
28	0	sizes = imgfile.getsizes(name)
29	0	except imgfile.error:
30	n/a	# get a more qualified path component of the script...
31	0	if __name__ == '__main__':
32	0	ourname = sys.argv[0]
33	n/a	else: # ...or the full path of the module
34	0	ourname = sys.modules[__name__].__file__
35	n/a
36	0	parts = ourname.split(os.sep)
37	0	parts[-1] = name
38	0	name = os.sep.join(parts)
39	0	sizes = imgfile.getsizes(name)
40	0	if verbose:
41	0	print 'Opening test image: %s, sizes: %s' % (name, str(sizes))
42	n/a	# This function reads and decodes the image on the specified file,
43	n/a	# and returns it as a python string. The string has either 1 byte
44	n/a	# greyscale pixels or 4 byte RGBA pixels. The bottom left pixel
45	n/a	# is the first in the string. This format is suitable to pass
46	n/a	# to gl.lrectwrite, for instance.
47	0	image = imgfile.read(name)
48	n/a
49	n/a	# This function writes the RGB or greyscale data in data to
50	n/a	# image file file. x and y give the size of the image, z is
51	n/a	# 1 for 1 byte greyscale images or 3 for RGB images (which
52	n/a	# are stored as 4 byte values of which only the lower three
53	n/a	# bytes are used). These are the formats returned by gl.lrectread.
54	0	if verbose:
55	0	print 'Writing output file'
56	0	imgfile.write (outputfile, image, sizes[0], sizes[1], sizes[2])
57	n/a
58	n/a
59	0	if verbose:
60	0	print 'Opening scaled test image: %s, sizes: %s' % (name, str(sizes))
61	n/a	# This function is identical to read but it returns an image that
62	n/a	# is scaled to the given x and y sizes. If the filter and blur
63	n/a	# parameters are omitted scaling is done by simply dropping
64	n/a	# or duplicating pixels, so the result will be less than perfect,
65	n/a	# especially for computer-generated images. Alternatively,
66	n/a	# you can specify a filter to use to smoothen the image after
67	n/a	# scaling. The filter forms supported are 'impulse', 'box',
68	n/a	# 'triangle', 'quadratic' and 'gaussian'. If a filter is
69	n/a	# specified blur is an optional parameter specifying the
70	n/a	# blurriness of the filter. It defaults to 1.0. readscaled
71	n/a	# makes no attempt to keep the aspect ratio correct, so that
72	n/a	# is the users' responsibility.
73	0	if verbose:
74	0	print 'Filtering with "impulse"'
75	0	simage = imgfile.readscaled (name, sizes[0]/2, sizes[1]/2, 'impulse', 2.0)
76	n/a
77	n/a	# This function sets a global flag which defines whether the
78	n/a	# scan lines of the image are read or written from bottom to
79	n/a	# top (flag is zero, compatible with SGI GL) or from top to
80	n/a	# bottom(flag is one, compatible with X). The default is zero.
81	0	if verbose:
82	0	print 'Switching to X compatibility'
83	0	imgfile.ttob (1)
84	n/a
85	0	if verbose:
86	0	print 'Filtering with "triangle"'
87	0	simage = imgfile.readscaled (name, sizes[0]/2, sizes[1]/2, 'triangle', 3.0)
88	0	if verbose:
89	0	print 'Switching back to SGI compatibility'
90	0	imgfile.ttob (0)
91	n/a
92	0	if verbose: print 'Filtering with "quadratic"'
93	0	simage = imgfile.readscaled (name, sizes[0]/2, sizes[1]/2, 'quadratic')
94	0	if verbose: print 'Filtering with "gaussian"'
95	0	simage = imgfile.readscaled (name, sizes[0]/2, sizes[1]/2, 'gaussian', 1.0)
96	n/a
97	0	if verbose:
98	0	print 'Writing output file'
99	0	imgfile.write (outputfile, simage, sizes[0]/2, sizes[1]/2, sizes[2])
100	n/a
101	0	os.unlink(outputfile)
102	n/a
103	n/a
104	0	def test_main():
105	n/a
106	0	uu.decode(findfile('testrgb.uue'), 'test.rgb')
107	0	uu.decode(findfile('greyrgb.uue'), 'greytest.rgb')
108	n/a
109	n/a	# Test a 3 byte color image
110	0	testimage('test.rgb')
111	n/a
112	n/a	# Test a 1 byte greyscale image
113	0	testimage('greytest.rgb')
114	n/a
115	0	unlink('test.rgb')
116	0	unlink('greytest.rgb')
117	n/a
118	0	if __name__ == '__main__':
119	0	test_main()