212 lines
6.7 KiB
Python
Executable File
212 lines
6.7 KiB
Python
Executable File
#! /usr/bin/env python
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"""Test script for the imageop module. This has the side
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effect of partially testing the imgfile module as well.
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Roger E. Masse
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"""
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from test.test_support import verbose, unlink, import_module, run_unittest
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imageop = import_module('imageop', deprecated=True)
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import uu, os, unittest
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SIZES = (1, 2, 3, 4)
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_VALUES = (1, 2, 2**10, 2**15-1, 2**15, 2**15+1, 2**31-2, 2**31-1)
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VALUES = tuple( -x for x in reversed(_VALUES) ) + (0,) + _VALUES
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AAAAA = "A" * 1024
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MAX_LEN = 2**20
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class InputValidationTests(unittest.TestCase):
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def _check(self, name, size=None, *extra):
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func = getattr(imageop, name)
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for height in VALUES:
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for width in VALUES:
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strlen = abs(width * height)
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if size:
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strlen *= size
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if strlen < MAX_LEN:
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data = "A" * strlen
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else:
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data = AAAAA
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if size:
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arguments = (data, size, width, height) + extra
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else:
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arguments = (data, width, height) + extra
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try:
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func(*arguments)
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except (ValueError, imageop.error):
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pass
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def check_size(self, name, *extra):
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for size in SIZES:
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self._check(name, size, *extra)
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def check(self, name, *extra):
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self._check(name, None, *extra)
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def test_input_validation(self):
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self.check_size("crop", 0, 0, 0, 0)
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self.check_size("scale", 1, 0)
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self.check_size("scale", -1, -1)
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self.check_size("tovideo")
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self.check("grey2mono", 128)
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self.check("grey2grey4")
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self.check("grey2grey2")
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self.check("dither2mono")
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self.check("dither2grey2")
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self.check("mono2grey", 0, 0)
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self.check("grey22grey")
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self.check("rgb2rgb8") # nlen*4 == len
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self.check("rgb82rgb")
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self.check("rgb2grey")
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self.check("grey2rgb")
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def test_main():
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run_unittest(InputValidationTests)
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try:
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import imgfile
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except ImportError:
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return
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# Create binary test files
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uu.decode(get_qualified_path('testrgb'+os.extsep+'uue'), 'test'+os.extsep+'rgb')
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image, width, height = getimage('test'+os.extsep+'rgb')
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# Return the selected part of image, which should by width by height
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# in size and consist of pixels of psize bytes.
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if verbose:
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print 'crop'
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newimage = imageop.crop (image, 4, width, height, 0, 0, 1, 1)
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# Return image scaled to size newwidth by newheight. No interpolation
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# is done, scaling is done by simple-minded pixel duplication or removal.
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# Therefore, computer-generated images or dithered images will
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# not look nice after scaling.
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if verbose:
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print 'scale'
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scaleimage = imageop.scale(image, 4, width, height, 1, 1)
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# Run a vertical low-pass filter over an image. It does so by computing
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# each destination pixel as the average of two vertically-aligned source
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# pixels. The main use of this routine is to forestall excessive flicker
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# if the image two vertically-aligned source pixels, hence the name.
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if verbose:
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print 'tovideo'
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videoimage = imageop.tovideo (image, 4, width, height)
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# Convert an rgb image to an 8 bit rgb
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if verbose:
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print 'rgb2rgb8'
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greyimage = imageop.rgb2rgb8(image, width, height)
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# Convert an 8 bit rgb image to a 24 bit rgb image
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if verbose:
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print 'rgb82rgb'
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image = imageop.rgb82rgb(greyimage, width, height)
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# Convert an rgb image to an 8 bit greyscale image
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if verbose:
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print 'rgb2grey'
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greyimage = imageop.rgb2grey(image, width, height)
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# Convert an 8 bit greyscale image to a 24 bit rgb image
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if verbose:
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print 'grey2rgb'
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image = imageop.grey2rgb(greyimage, width, height)
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# Convert a 8-bit deep greyscale image to a 1-bit deep image by
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# thresholding all the pixels. The resulting image is tightly packed
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# and is probably only useful as an argument to mono2grey.
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if verbose:
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print 'grey2mono'
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monoimage = imageop.grey2mono (greyimage, width, height, 0)
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# monoimage, width, height = getimage('monotest.rgb')
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# Convert a 1-bit monochrome image to an 8 bit greyscale or color image.
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# All pixels that are zero-valued on input get value p0 on output and
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# all one-value input pixels get value p1 on output. To convert a
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# monochrome black-and-white image to greyscale pass the values 0 and
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# 255 respectively.
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if verbose:
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print 'mono2grey'
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greyimage = imageop.mono2grey (monoimage, width, height, 0, 255)
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# Convert an 8-bit greyscale image to a 1-bit monochrome image using a
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# (simple-minded) dithering algorithm.
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if verbose:
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print 'dither2mono'
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monoimage = imageop.dither2mono (greyimage, width, height)
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# Convert an 8-bit greyscale image to a 4-bit greyscale image without
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# dithering.
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if verbose:
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print 'grey2grey4'
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grey4image = imageop.grey2grey4 (greyimage, width, height)
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# Convert an 8-bit greyscale image to a 2-bit greyscale image without
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# dithering.
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if verbose:
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print 'grey2grey2'
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grey2image = imageop.grey2grey2 (greyimage, width, height)
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# Convert an 8-bit greyscale image to a 2-bit greyscale image with
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# dithering. As for dither2mono, the dithering algorithm is currently
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# very simple.
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if verbose:
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print 'dither2grey2'
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grey2image = imageop.dither2grey2 (greyimage, width, height)
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# Convert a 4-bit greyscale image to an 8-bit greyscale image.
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if verbose:
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print 'grey42grey'
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greyimage = imageop.grey42grey (grey4image, width, height)
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# Convert a 2-bit greyscale image to an 8-bit greyscale image.
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if verbose:
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print 'grey22grey'
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image = imageop.grey22grey (grey2image, width, height)
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# Cleanup
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unlink('test'+os.extsep+'rgb')
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def getimage(name):
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"""return a tuple consisting of
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image (in 'imgfile' format) width and height
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"""
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import imgfile
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try:
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sizes = imgfile.getsizes(name)
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except imgfile.error:
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name = get_qualified_path(name)
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sizes = imgfile.getsizes(name)
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if verbose:
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print 'imgfile opening test image: %s, sizes: %s' % (name, str(sizes))
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image = imgfile.read(name)
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return (image, sizes[0], sizes[1])
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def get_qualified_path(name):
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""" return a more qualified path to name"""
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import sys
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import os
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path = sys.path
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try:
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path = [os.path.dirname(__file__)] + path
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except NameError:
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pass
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for dir in path:
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fullname = os.path.join(dir, name)
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if os.path.exists(fullname):
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return fullname
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return name
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if __name__ == '__main__':
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test_main()
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