| 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 |
|
|---|
| 9 | import os
|
|---|
| 10 | import tempfile
|
|---|
| 11 | import pipes
|
|---|
| 12 | import imghdr
|
|---|
| 13 |
|
|---|
| 14 | table = {}
|
|---|
| 15 |
|
|---|
| 16 | t = pipes.Template()
|
|---|
| 17 | t.append('fromppm $IN $OUT', 'ff')
|
|---|
| 18 | table['ppm'] = t
|
|---|
| 19 |
|
|---|
| 20 | t = pipes.Template()
|
|---|
| 21 | t.append('(PATH=$PATH:/ufs/guido/bin/sgi; exec pnmtoppm)', '--')
|
|---|
| 22 | t.append('fromppm $IN $OUT', 'ff')
|
|---|
| 23 | table['pnm'] = t
|
|---|
| 24 | table['pgm'] = t
|
|---|
| 25 | table['pbm'] = t
|
|---|
| 26 |
|
|---|
| 27 | t = pipes.Template()
|
|---|
| 28 | t.append('fromgif $IN $OUT', 'ff')
|
|---|
| 29 | table['gif'] = t
|
|---|
| 30 |
|
|---|
| 31 | t = pipes.Template()
|
|---|
| 32 | t.append('tifftopnm', '--')
|
|---|
| 33 | t.append('(PATH=$PATH:/ufs/guido/bin/sgi; exec pnmtoppm)', '--')
|
|---|
| 34 | t.append('fromppm $IN $OUT', 'ff')
|
|---|
| 35 | table['tiff'] = t
|
|---|
| 36 |
|
|---|
| 37 | t = pipes.Template()
|
|---|
| 38 | t.append('rasttopnm', '--')
|
|---|
| 39 | t.append('(PATH=$PATH:/ufs/guido/bin/sgi; exec pnmtoppm)', '--')
|
|---|
| 40 | t.append('fromppm $IN $OUT', 'ff')
|
|---|
| 41 | table['rast'] = t
|
|---|
| 42 |
|
|---|
| 43 | t = pipes.Template()
|
|---|
| 44 | t.append('djpeg', '--')
|
|---|
| 45 | t.append('(PATH=$PATH:/ufs/guido/bin/sgi; exec pnmtoppm)', '--')
|
|---|
| 46 | t.append('fromppm $IN $OUT', 'ff')
|
|---|
| 47 | table['jpeg'] = t
|
|---|
| 48 |
|
|---|
| 49 | uncompress = pipes.Template()
|
|---|
| 50 | uncompress.append('uncompress', '--')
|
|---|
| 51 |
|
|---|
| 52 |
|
|---|
| 53 | class error(Exception):
|
|---|
| 54 | pass
|
|---|
| 55 |
|
|---|
| 56 | def torgb(filename):
|
|---|
| 57 | temps = []
|
|---|
| 58 | ret = None
|
|---|
| 59 | try:
|
|---|
| 60 | ret = _torgb(filename, temps)
|
|---|
| 61 | finally:
|
|---|
| 62 | for temp in temps[:]:
|
|---|
| 63 | if temp != ret:
|
|---|
| 64 | try:
|
|---|
| 65 | os.unlink(temp)
|
|---|
| 66 | except os.error:
|
|---|
| 67 | pass
|
|---|
| 68 | temps.remove(temp)
|
|---|
| 69 | return ret
|
|---|
| 70 |
|
|---|
| 71 | def _torgb(filename, temps):
|
|---|
| 72 | if filename[-2:] == '.Z':
|
|---|
| 73 | (fd, fname) = tempfile.mkstemp()
|
|---|
| 74 | os.close(fd)
|
|---|
| 75 | temps.append(fname)
|
|---|
| 76 | sts = uncompress.copy(filename, fname)
|
|---|
| 77 | if sts:
|
|---|
| 78 | raise error, filename + ': uncompress failed'
|
|---|
| 79 | else:
|
|---|
| 80 | fname = filename
|
|---|
| 81 | try:
|
|---|
| 82 | ftype = imghdr.what(fname)
|
|---|
| 83 | except IOError, msg:
|
|---|
| 84 | if type(msg) == type(()) and len(msg) == 2 and \
|
|---|
| 85 | type(msg[0]) == type(0) and type(msg[1]) == type(''):
|
|---|
| 86 | msg = msg[1]
|
|---|
| 87 | if type(msg) is not type(''):
|
|---|
| 88 | msg = repr(msg)
|
|---|
| 89 | raise error, filename + ': ' + msg
|
|---|
| 90 | if ftype == 'rgb':
|
|---|
| 91 | return fname
|
|---|
| 92 | if ftype is None or not table.has_key(ftype):
|
|---|
| 93 | raise error, '%s: unsupported image file type %r' % (filename, ftype)
|
|---|
| 94 | (fd, temp) = tempfile.mkstemp()
|
|---|
| 95 | os.close(fd)
|
|---|
| 96 | sts = table[ftype].copy(fname, temp)
|
|---|
| 97 | if sts:
|
|---|
| 98 | raise error, filename + ': conversion to rgb failed'
|
|---|
| 99 | return temp
|
|---|
