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Merge pull request #1435 from radarhere/tiff

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Minor Tiff formatting changes
This commit is contained in:
wiredfool 2015-09-29 15:43:40 +01:00
commit ca929bdfc0
3 changed files with 42 additions and 40 deletions
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74
PIL/TiffImagePlugin.py
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@ -227,6 +227,7 @@ def _limit_rational(val, max_val):
_load_dispatch = {}
_write_dispatch = {}
class ImageFileDirectory_v2(collections.MutableMapping):
"""This class represents a TIFF tag directory. To speed things up, we
don't decode tags unless they're asked for.
@ -238,9 +239,9 @@ class ImageFileDirectory_v2(collections.MutableMapping):
ifd.tagtype[key] = 2
print(ifd[key])
'Some Data'
Individual values are returned as the strings or numbers, sequences are
returned as tuples of the values.
returned as tuples of the values.
The tiff metadata type of each item is stored in a dictionary of
tag types in
@ -251,7 +252,7 @@ class ImageFileDirectory_v2(collections.MutableMapping):
Data Structures:
* self.tagtype = {}
* Key: numerical tiff tag number
* Value: integer corresponding to the data type from `~PIL.TiffTags.TYPES`
@ -259,7 +260,7 @@ class ImageFileDirectory_v2(collections.MutableMapping):
"""
"""
Documentation:
'internal' data structures:
* self._tags_v2 = {} Key: numerical tiff tag number
Value: decoded data, as tuple for multiple values
@ -267,7 +268,7 @@ class ImageFileDirectory_v2(collections.MutableMapping):
Value: undecoded byte string from file
* self._tags_v1 = {} Key: numerical tiff tag number
Value: decoded data in the v1 format
Tags will be found in the private attributes self._tagdata, and in
self._tags_v2 once decoded.
@ -277,7 +278,7 @@ class ImageFileDirectory_v2(collections.MutableMapping):
tags will be populated into both _tags_v1 and _tags_v2. _Tags_v2
will be used if this IFD is used in the TIFF save routine. Tags
should be read from tags_v1 if legacy_api == true.
"""
def __init__(self, ifh=b"II\052\0\0\0\0\0", prefix=None):
@ -313,10 +314,10 @@ class ImageFileDirectory_v2(collections.MutableMapping):
raise Exception("Not allowing setting of legacy api")
def reset(self):
self._tags_v1 = {} # will remain empty if legacy_api is false
self._tags_v2 = {} # main tag storage
self._tags_v1 = {} # will remain empty if legacy_api is false
self._tags_v2 = {} # main tag storage
self._tagdata = {}
self.tagtype = {} # added 2008-06-05 by Florian Hoech
self.tagtype = {} # added 2008-06-05 by Florian Hoech
self._next = None
self._offset = None
@ -327,7 +328,7 @@ class ImageFileDirectory_v2(collections.MutableMapping):
"""Return a dictionary of the image's tags.
use `dict(ifd)` instead.
.. deprecated:: 3.0.0
"""
# FIXME Deprecate: use dict(self)
@ -336,7 +337,7 @@ class ImageFileDirectory_v2(collections.MutableMapping):
def named(self):
"""
:returns: dict of name|key: value
Returns the complete tag dictionary, with named tags where possible.
"""
return dict((TAGS_V2.get(code, TagInfo()).name, value)
@ -395,13 +396,13 @@ class ImageFileDirectory_v2(collections.MutableMapping):
self.tagtype[tag] = 2
if self.tagtype[tag] == 7 and bytes is not str:
values = [value.encode("ascii",'replace') if isinstance(value, str) else value
values = [value.encode("ascii", 'replace') if isinstance(value, str) else value
for value in values]
values = tuple(info.cvt_enum(value) for value in values)
dest = self._tags_v1 if legacy_api else self._tags_v2
if info.length == 1:
if legacy_api and self.tagtype[tag] in [5, 10]:
values = values,
@ -453,12 +454,12 @@ class ImageFileDirectory_v2(collections.MutableMapping):
(6, "b", "signed byte"), (8, "h", "signed short"),
(9, "l", "signed long"), (11, "f", "float"), (12, "d", "double")]))
@_register_loader(1, 1) # Basic type, except for the legacy API.
@_register_loader(1, 1) # Basic type, except for the legacy API.
def load_byte(self, data, legacy_api=True):
return (data if legacy_api else
tuple(map(ord, data) if bytes is str else data))
@_register_writer(1) # Basic type, except for the legacy API.
@_register_writer(1) # Basic type, except for the legacy API.
def write_byte(self, data):
return data
@ -472,7 +473,7 @@ class ImageFileDirectory_v2(collections.MutableMapping):
def write_string(self, value):
# remerge of https://github.com/python-pillow/Pillow/pull/1416
if sys.version_info[0] == 2:
value = value.decode('ascii', 'replace')
value = value.decode('ascii', 'replace')
return b"" + value.encode('ascii', 'replace') + b"\0"
@_register_loader(5, 8)
@ -521,8 +522,8 @@ class ImageFileDirectory_v2(collections.MutableMapping):
self._offset = fp.tell()
try:
for i in range(self._unpack("H", self._ensure_read(fp,2))[0]):
tag, typ, count, data = self._unpack("HHL4s", self._ensure_read(fp,12))
for i in range(self._unpack("H", self._ensure_read(fp, 2))[0]):
tag, typ, count, data = self._unpack("HHL4s", self._ensure_read(fp, 12))
if DEBUG:
tagname = TAGS_V2.get(tag, TagInfo()).name
typname = TYPES.get(typ, "unknown")
@ -563,11 +564,11 @@ class ImageFileDirectory_v2(collections.MutableMapping):
else:
print("- value:", self[tag])
self.next, = self._unpack("L", self._ensure_read(fp,4))
self.next, = self._unpack("L", self._ensure_read(fp, 4))
except IOError as msg:
warnings.warn(str(msg))
return
def save(self, fp):
if fp.tell() == 0: # skip TIFF header on subsequent pages
@ -608,7 +609,7 @@ class ImageFileDirectory_v2(collections.MutableMapping):
entries.append((tag, typ, count, data.ljust(4, b"\0"), b""))
else:
entries.append((tag, typ, count, self._pack("L", offset), data))
offset += (len(data) + 1) // 2 * 2 # pad to word
offset += (len(data) + 1) // 2 * 2 # pad to word
# update strip offset data to point beyond auxiliary data
if stripoffsets is not None:
@ -644,10 +645,11 @@ for idx, name in TYPES.items():
setattr(ImageFileDirectory_v2, "write_" + name, _write_dispatch[idx])
del _load_dispatch, _write_dispatch, idx, name
#Legacy ImageFileDirectory support.
# Legacy ImageFileDirectory support.
class ImageFileDirectory_v1(ImageFileDirectory_v2):
"""This class represents the **legacy** interface to a TIFF tag directory.
"""This class represents the **legacy** interface to a TIFF tag directory.
Exposes a dictionary interface of the tags in the directory::
ifd = ImageFileDirectory_v1()
@ -655,18 +657,17 @@ class ImageFileDirectory_v1(ImageFileDirectory_v2):
ifd.tagtype[key] = 2
print ifd[key]
('Some Data',)
Also contains a dictionary of tag types as read from the tiff image file,
`~PIL.TiffImagePlugin.ImageFileDirectory_v1.tagtype`.
`~PIL.TiffImagePlugin.ImageFileDirectory_v1.tagtype`.
Values are returned as a tuple.
.. deprecated:: 3.0.0
"""
def __init__(self, *args, **kwargs):
ImageFileDirectory_v2.__init__(self, *args, **kwargs)
self._legacy_api=True
#insert deprecation warning here.
self._legacy_api = True
tags = property(lambda self: self._tags_v1)
tagdata = property(lambda self: self._tagdata)
@ -686,7 +687,7 @@ class ImageFileDirectory_v1(ImageFileDirectory_v2):
ifd = cls(prefix=original.prefix)
ifd._tagdata = original._tagdata
ifd.tagtype = original.tagtype
ifd.next = original.next # an indicator for multipage tiffs
ifd.next = original.next # an indicator for multipage tiffs
return ifd
def to_v2(self):
@ -699,7 +700,7 @@ class ImageFileDirectory_v1(ImageFileDirectory_v2):
:returns: :py:class:`~PIL.TiffImagePlugin.ImageFileDirectory_v2`
"""
ifd = ImageFileDirectory_v2(prefix=self.prefix)
ifd._tagdata = dict(self._tagdata)
ifd.tagtype = dict(self.tagtype)
@ -708,7 +709,7 @@ class ImageFileDirectory_v1(ImageFileDirectory_v2):
def __contains__(self, tag):
return tag in self._tags_v1 or tag in self._tagdata
def __len__(self):
return len(set(self._tagdata) | set(self._tags_v1))
@ -716,9 +717,9 @@ class ImageFileDirectory_v1(ImageFileDirectory_v2):
return iter(set(self._tagdata) | set(self._tags_v1))
def __setitem__(self, tag, value):
for legacy_api in (False,True):
for legacy_api in (False, True):
self._setitem(tag, value, legacy_api)
def __getitem__(self, tag):
if tag not in self._tags_v1: # unpack on the fly
data = self._tagdata[tag]
@ -731,10 +732,11 @@ class ImageFileDirectory_v1(ImageFileDirectory_v2):
val = val,
return val
# undone -- switch this pointer when IFD_LEGACY_API == False
ImageFileDirectory = ImageFileDirectory_v1
##
# Image plugin for TIFF files.
@ -827,7 +829,7 @@ class TiffImageFile(ImageFile.ImageFile):
self.__frame += 1
self.fp.seek(self._frame_pos[frame])
self.tag_v2.load(self.fp)
# fill the legacy tag/ifd entries
# fill the legacy tag/ifd entries
self.tag = self.ifd = ImageFileDirectory_v1.from_v2(self.tag_v2)
self.__frame = frame
self._setup()

6
PIL/TiffTags.py
View File

@ -19,6 +19,7 @@
from collections import namedtuple
class TagInfo(namedtuple("_TagInfo", "value name type length enum")):
__slots__ = []
@ -278,12 +279,12 @@ TAGS = {347: 'JPEGTables',
50740: 'DNGPrivateData',
50778: 'CalibrationIlluminant1',
50779: 'CalibrationIlluminant2',
}
}
def _populate():
for k, v in TAGS_V2.items():
# Populate legacy structure.
# Populate legacy structure.
TAGS[k] = v[0]
if len(v) == 4:
for sk, sv in v[3].items():
@ -312,4 +313,3 @@ TYPES = {}
# 11: "float",
# 12: "double",
# }

2
docs/handbook/image-file-formats.rst
View File

@ -512,7 +512,7 @@ The :py:meth:`~PIL.Image.Image.save` method can take the following keyword argum
For compatibility with legacy code, a
`~PIL.TiffImagePlugin.ImageFileDirectory_v1` object may be passed
in this field. This will be deprecated in a future version.
in this field. However, this is deprecated.
..versionadded:: 3.0.0