Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_imgfile.py @ 5817:48b94de85bf3 legacy-trunk

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Extensive changes by AMK.
author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
parents 359e8f815a3a
children aedd2d0dcb31
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1 #! /usr/bin/env python
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2
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3 """Simple test script for imgfile.c
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4 Roger E. Masse
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5 """
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6
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7 from test_support import verbose, unlink
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8
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9 import imgfile, uu, os
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10
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11
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12 def main():
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13
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14 uu.decode(findfile('testrgb.uue'), 'test.rgb')
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15 uu.decode(findfile('greyrgb.uue'), 'greytest.rgb')
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16
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17 # Test a 3 byte color image
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18 testimage('test.rgb')
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19
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20 # Test a 1 byte greyscale image
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21 testimage('greytest.rgb')
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22
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23 unlink('test.rgb')
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24 unlink('greytest.rgb')
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25
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26 def findfile(file):
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27 if os.path.isabs(file): return file
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28 import sys
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29 for dn in sys.path:
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30 fn = os.path.join(dn, file)
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31 if os.path.exists(fn): return fn
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32 return file
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33
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34 def testimage(name):
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35 """Run through the imgfile's battery of possible methods
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36 on the image passed in name.
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37 """
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38
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39 import sys
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40 import os
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41 import string
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42
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43 outputfile = '/tmp/deleteme'
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44
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45 # try opening the name directly
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46 try:
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47 # This function returns a tuple (x, y, z) where x and y are the size
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48 # of the image in pixels and z is the number of bytes per pixel. Only
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49 # 3 byte RGB pixels and 1 byte greyscale pixels are supported.
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50 sizes = imgfile.getsizes(name)
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51 except imgfile.error:
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52 # get a more qualified path component of the script...
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53 if __name__ == '__main__':
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54 ourname = sys.argv[0]
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55 else: # ...or the full path of the module
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56 ourname = sys.modules[__name__].__file__
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57
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58 parts = string.splitfields(ourname, os.sep)
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59 parts[-1] = name
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60 name = string.joinfields(parts, os.sep)
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61 sizes = imgfile.getsizes(name)
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62 if verbose:
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63 print 'Opening test image: %s, sizes: %s' % (name, str(sizes))
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64 # This function reads and decodes the image on the specified file,
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65 # and returns it as a python string. The string has either 1 byte
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66 # greyscale pixels or 4 byte RGBA pixels. The bottom left pixel
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67 # is the first in the string. This format is suitable to pass
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68 # to gl.lrectwrite, for instance.
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69 image = imgfile.read(name)
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70
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71 # This function writes the RGB or greyscale data in data to
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72 # image file file. x and y give the size of the image, z is
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73 # 1 for 1 byte greyscale images or 3 for RGB images (which
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74 # are stored as 4 byte values of which only the lower three
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75 # bytes are used). These are the formats returned by gl.lrectread.
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76 if verbose:
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77 print 'Writing output file'
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78 imgfile.write (outputfile, image, sizes[0], sizes[1], sizes[2])
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79
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80
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81 if verbose:
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82 print 'Opening scaled test image: %s, sizes: %s' % (name, str(sizes))
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83 # This function is identical to read but it returns an image that
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84 # is scaled to the given x and y sizes. If the filter and blur
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85 # parameters are omitted scaling is done by simply dropping
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86 # or duplicating pixels, so the result will be less than perfect,
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87 # especially for computer-generated images. Alternatively,
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88 # you can specify a filter to use to smoothen the image after
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89 # scaling. The filter forms supported are 'impulse', 'box',
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90 # 'triangle', 'quadratic' and 'gaussian'. If a filter is
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91 # specified blur is an optional parameter specifying the
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92 # blurriness of the filter. It defaults to 1.0. readscaled
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93 # makes no attempt to keep the aspect ratio correct, so that
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94 # is the users' responsibility.
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95 if verbose:
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96 print 'Filtering with "impulse"'
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97 simage = imgfile.readscaled (name, sizes[0]/2, sizes[1]/2, 'impulse', 2.0)
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98
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99 # This function sets a global flag which defines whether the
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100 # scan lines of the image are read or written from bottom to
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101 # top (flag is zero, compatible with SGI GL) or from top to
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102 # bottom(flag is one, compatible with X). The default is zero.
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103 if verbose:
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104 print 'Switching to X compatibility'
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105 imgfile.ttob (1)
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106
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107 if verbose:
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108 print 'Filtering with "triangle"'
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109 simage = imgfile.readscaled (name, sizes[0]/2, sizes[1]/2, 'triangle', 3.0)
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110 if verbose:
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111 print 'Switching back to SGI compatibility'
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112 imgfile.ttob (0)
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113
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114 if verbose: print 'Filtering with "quadratic"'
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115 simage = imgfile.readscaled (name, sizes[0]/2, sizes[1]/2, 'quadratic')
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116 if verbose: print 'Filtering with "gaussian"'
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117 simage = imgfile.readscaled (name, sizes[0]/2, sizes[1]/2, 'gaussian', 1.0)
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118
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119 if verbose:
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120 print 'Writing output file'
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121 imgfile.write (outputfile, simage, sizes[0]/2, sizes[1]/2, sizes[2])
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122
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123 os.unlink(outputfile)
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124
a2c427f9db02 Test script for the SGI imgfile module.
Roger E. Masse <rmasse@newcnri.cnri.reston.va.us>
parents:
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125 main()