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/Lib/plat-irix6/torgb.py

http://unladen-swallow.googlecode.com/
Python | 102 lines | 82 code | 13 blank | 7 comment | 9 complexity | 1f4b6b241108e304d4abb10cad21bdcc MD5 | raw file
  1# Convert "arbitrary" image files to rgb files (SGI's image format).
  2# Input may be compressed.
  3# The uncompressed file type may be PBM, PGM, PPM, GIF, TIFF, or Sun raster.
  4# An exception is raised if the file is not of a recognized type.
  5# Returned filename is either the input filename or a temporary filename;
  6# in the latter case the caller must ensure that it is removed.
  7# Other temporary files used are removed by the function.
  8from warnings import warnpy3k
  9warnpy3k("the torgb module has been removed in Python 3.0", stacklevel=2)
 10del warnpy3k
 11
 12import os
 13import tempfile
 14import pipes
 15import imghdr
 16
 17table = {}
 18
 19t = pipes.Template()
 20t.append('fromppm $IN $OUT', 'ff')
 21table['ppm'] = t
 22
 23t = pipes.Template()
 24t.append('(PATH=$PATH:/ufs/guido/bin/sgi; exec pnmtoppm)', '--')
 25t.append('fromppm $IN $OUT', 'ff')
 26table['pnm'] = t
 27table['pgm'] = t
 28table['pbm'] = t
 29
 30t = pipes.Template()
 31t.append('fromgif $IN $OUT', 'ff')
 32table['gif'] = t
 33
 34t = pipes.Template()
 35t.append('tifftopnm', '--')
 36t.append('(PATH=$PATH:/ufs/guido/bin/sgi; exec pnmtoppm)', '--')
 37t.append('fromppm $IN $OUT', 'ff')
 38table['tiff'] = t
 39
 40t = pipes.Template()
 41t.append('rasttopnm', '--')
 42t.append('(PATH=$PATH:/ufs/guido/bin/sgi; exec pnmtoppm)', '--')
 43t.append('fromppm $IN $OUT', 'ff')
 44table['rast'] = t
 45
 46t = pipes.Template()
 47t.append('djpeg', '--')
 48t.append('(PATH=$PATH:/ufs/guido/bin/sgi; exec pnmtoppm)', '--')
 49t.append('fromppm $IN $OUT', 'ff')
 50table['jpeg'] = t
 51
 52uncompress = pipes.Template()
 53uncompress.append('uncompress', '--')
 54
 55
 56class error(Exception):
 57    pass
 58
 59def torgb(filename):
 60    temps = []
 61    ret = None
 62    try:
 63        ret = _torgb(filename, temps)
 64    finally:
 65        for temp in temps[:]:
 66            if temp != ret:
 67                try:
 68                    os.unlink(temp)
 69                except os.error:
 70                    pass
 71                temps.remove(temp)
 72    return ret
 73
 74def _torgb(filename, temps):
 75    if filename[-2:] == '.Z':
 76        (fd, fname) = tempfile.mkstemp()
 77        os.close(fd)
 78        temps.append(fname)
 79        sts = uncompress.copy(filename, fname)
 80        if sts:
 81            raise error, filename + ': uncompress failed'
 82    else:
 83        fname = filename
 84    try:
 85        ftype = imghdr.what(fname)
 86    except IOError, msg:
 87        if type(msg) == type(()) and len(msg) == 2 and \
 88                type(msg[0]) == type(0) and type(msg[1]) == type(''):
 89            msg = msg[1]
 90        if type(msg) is not type(''):
 91            msg = repr(msg)
 92        raise error, filename + ': ' + msg
 93    if ftype == 'rgb':
 94        return fname
 95    if ftype is None or not table.has_key(ftype):
 96        raise error, '%s: unsupported image file type %r' % (filename, ftype)
 97    (fd, temp) = tempfile.mkstemp()
 98    os.close(fd)
 99    sts = table[ftype].copy(fname, temp)
100    if sts:
101        raise error, filename + ': conversion to rgb failed'
102    return temp