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      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
    103