Lib/plat-irix6/torgb.py

   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.
   8 from warnings import warnpy3k
   9 warnpy3k("the torgb module has been removed in Python 3.0", stacklevel=2)
  10 del warnpy3k
  11
  12 import os
  13 import tempfile
  14 import pipes
  15 import imghdr
  16
  17 table = {}
  18
  19 t = pipes.Template()
  20 t.append('fromppm $IN $OUT', 'ff')
  21 table['ppm'] = t
  22
  23 t = pipes.Template()
  24 t.append('(PATH=$PATH:/ufs/guido/bin/sgi; exec pnmtoppm)', '--')
  25 t.append('fromppm $IN $OUT', 'ff')
  26 table['pnm'] = t
  27 table['pgm'] = t
  28 table['pbm'] = t
  29
  30 t = pipes.Template()
  31 t.append('fromgif $IN $OUT', 'ff')
  32 table['gif'] = t
  33
  34 t = pipes.Template()
  35 t.append('tifftopnm', '--')
  36 t.append('(PATH=$PATH:/ufs/guido/bin/sgi; exec pnmtoppm)', '--')
  37 t.append('fromppm $IN $OUT', 'ff')
  38 table['tiff'] = t
  39
  40 t = pipes.Template()
  41 t.append('rasttopnm', '--')
  42 t.append('(PATH=$PATH:/ufs/guido/bin/sgi; exec pnmtoppm)', '--')
  43 t.append('fromppm $IN $OUT', 'ff')
  44 table['rast'] = t
  45
  46 t = pipes.Template()
  47 t.append('djpeg', '--')
  48 t.append('(PATH=$PATH:/ufs/guido/bin/sgi; exec pnmtoppm)', '--')
  49 t.append('fromppm $IN $OUT', 'ff')
  50 table['jpeg'] = t
  51
  52 uncompress = pipes.Template()
  53 uncompress.append('uncompress', '--')
  54
  55
  56 class error(Exception):
  57     pass
  58
  59 def 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
  74 def _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