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-#! /usr/bin/env python
-
-"""Simple test script for imgfile.c
- Roger E. Masse
-"""
-
-from test_support import verbose, unlink, findfile
-
-import imgfile, uu, os
-
-
-def main():
-
- uu.decode(findfile('testrgb.uue'), 'test.rgb')
- uu.decode(findfile('greyrgb.uue'), 'greytest.rgb')
-
- # Test a 3 byte color image
- testimage('test.rgb')
-
- # Test a 1 byte greyscale image
- testimage('greytest.rgb')
-
- unlink('test.rgb')
- unlink('greytest.rgb')
-
-def testimage(name):
- """Run through the imgfile's battery of possible methods
- on the image passed in name.
- """
-
- import sys
- import os
- import string
-
- outputfile = '/tmp/deleteme'
-
- # try opening the name directly
- try:
- # This function returns a tuple (x, y, z) where x and y are the size
- # of the image in pixels and z is the number of bytes per pixel. Only
- # 3 byte RGB pixels and 1 byte greyscale pixels are supported.
- sizes = imgfile.getsizes(name)
- except imgfile.error:
- # get a more qualified path component of the script...
- if __name__ == '__main__':
- ourname = sys.argv[0]
- else: # ...or the full path of the module
- ourname = sys.modules[__name__].__file__
-
- parts = string.splitfields(ourname, os.sep)
- parts[-1] = name
- name = string.joinfields(parts, os.sep)
- sizes = imgfile.getsizes(name)
- if verbose:
- print 'Opening test image: %s, sizes: %s' % (name, str(sizes))
- # This function reads and decodes the image on the specified file,
- # and returns it as a python string. The string has either 1 byte
- # greyscale pixels or 4 byte RGBA pixels. The bottom left pixel
- # is the first in the string. This format is suitable to pass
- # to gl.lrectwrite, for instance.
- image = imgfile.read(name)
-
- # This function writes the RGB or greyscale data in data to
- # image file file. x and y give the size of the image, z is
- # 1 for 1 byte greyscale images or 3 for RGB images (which
- # are stored as 4 byte values of which only the lower three
- # bytes are used). These are the formats returned by gl.lrectread.
- if verbose:
- print 'Writing output file'
- imgfile.write (outputfile, image, sizes[0], sizes[1], sizes[2])
-
-
- if verbose:
- print 'Opening scaled test image: %s, sizes: %s' % (name, str(sizes))
- # This function is identical to read but it returns an image that
- # is scaled to the given x and y sizes. If the filter and blur
- # parameters are omitted scaling is done by simply dropping
- # or duplicating pixels, so the result will be less than perfect,
- # especially for computer-generated images. Alternatively,
- # you can specify a filter to use to smoothen the image after
- # scaling. The filter forms supported are 'impulse', 'box',
- # 'triangle', 'quadratic' and 'gaussian'. If a filter is
- # specified blur is an optional parameter specifying the
- # blurriness of the filter. It defaults to 1.0. readscaled
- # makes no attempt to keep the aspect ratio correct, so that
- # is the users' responsibility.
- if verbose:
- print 'Filtering with "impulse"'
- simage = imgfile.readscaled (name, sizes[0]/2, sizes[1]/2, 'impulse', 2.0)
-
- # This function sets a global flag which defines whether the
- # scan lines of the image are read or written from bottom to
- # top (flag is zero, compatible with SGI GL) or from top to
- # bottom(flag is one, compatible with X). The default is zero.
- if verbose:
- print 'Switching to X compatibility'
- imgfile.ttob (1)
-
- if verbose:
- print 'Filtering with "triangle"'
- simage = imgfile.readscaled (name, sizes[0]/2, sizes[1]/2, 'triangle', 3.0)
- if verbose:
- print 'Switching back to SGI compatibility'
- imgfile.ttob (0)
-
- if verbose: print 'Filtering with "quadratic"'
- simage = imgfile.readscaled (name, sizes[0]/2, sizes[1]/2, 'quadratic')
- if verbose: print 'Filtering with "gaussian"'
- simage = imgfile.readscaled (name, sizes[0]/2, sizes[1]/2, 'gaussian', 1.0)
-
- if verbose:
- print 'Writing output file'
- imgfile.write (outputfile, simage, sizes[0]/2, sizes[1]/2, sizes[2])
-
- os.unlink(outputfile)
-
-main()