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Added writing of subIFDs

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This commit is contained in:
Andrew Murray 2020-08-13 21:36:39 +10:00
parent 0693b45213
commit e96109b93c
2 changed files with 42 additions and 20 deletions
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35
Tests/test_file_jpeg.py
View File

@ -224,23 +224,30 @@ class TestFileJpeg:
# Should not raise a TypeError
im._getexif()
def test_exif_gps(self):
# Arrange
def test_exif_gps(self, tmp_path):
expected_exif_gps = {
0: b"\x00\x00\x00\x01",
2: 4294967295,
5: b"\x01",
30: 65535,
29: "1999:99:99 99:99:99",
}
gps_index = 34853
# Reading
with Image.open("Tests/images/exif_gps.jpg") as im:
gps_index = 34853
expected_exif_gps = {
0: b"\x00\x00\x00\x01",
2: 4294967295,
5: b"\x01",
30: 65535,
29: "1999:99:99 99:99:99",
}
# Act
exif = im._getexif()
assert exif[gps_index] == expected_exif_gps
# Assert
assert exif[gps_index] == expected_exif_gps
# Writing
f = str(tmp_path / "temp.jpg")
exif = Image.Exif()
exif[gps_index] = expected_exif_gps
hopper().save(f, exif=exif)
with Image.open(f) as reloaded:
exif = reloaded._getexif()
assert exif[gps_index] == expected_exif_gps
def test_exif_rollback(self):
# rolling back exif support in 3.1 to pre-3.0 formatting.

27
src/PIL/TiffImagePlugin.py
View File

@ -567,7 +567,9 @@ class ImageFileDirectory_v2(MutableMapping):
elif self.tagtype[tag] == TiffTags.RATIONAL:
values = [float(v) if isinstance(v, int) else v for v in values]
values = tuple(info.cvt_enum(value) for value in values)
is_ifd = self.tagtype[tag] == TiffTags.LONG and isinstance(values, dict)
if not is_ifd:
values = tuple(info.cvt_enum(value) for value in values)
dest = self._tags_v1 if legacy_api else self._tags_v2
@ -576,7 +578,7 @@ class ImageFileDirectory_v2(MutableMapping):
# Spec'd length == 1, Actual > 1, Warn and truncate. Formerly barfed.
# No Spec, Actual length 1, Formerly (<4.2) returned a 1 element tuple.
# Don't mess with the legacy api, since it's frozen.
if (
if not is_ifd and (
(info.length == 1)
or self.tagtype[tag] == TiffTags.BYTE
or (info.length is None and len(values) == 1 and not legacy_api)
@ -802,11 +804,22 @@ class ImageFileDirectory_v2(MutableMapping):
stripoffsets = len(entries)
typ = self.tagtype.get(tag)
logger.debug("Tag {}, Type: {}, Value: {}".format(tag, typ, value))
values = value if isinstance(value, tuple) else (value,)
data = self._write_dispatch[typ](self, *values)
is_ifd = typ == TiffTags.LONG and isinstance(value, dict)
if is_ifd:
if self._endian == "<":
ifh = b"II\x2A\x00\x08\x00\x00\x00"
else:
ifh = b"MM\x00\x2A\x00\x00\x00\x08"
ifd = ImageFileDirectory_v2(ifh)
for ifd_tag, ifd_value in self._tags_v2[tag].items():
ifd[ifd_tag] = ifd_value
data = ifd.tobytes(offset)
else:
values = value if isinstance(value, tuple) else (value,)
data = self._write_dispatch[typ](self, *values)
tagname = TiffTags.lookup(tag).name
typname = TYPES.get(typ, "unknown")
typname = "ifd" if is_ifd else TYPES.get(typ, "unknown")
msg = "save: %s (%d) - type: %s (%d)" % (tagname, tag, typname, typ)
msg += " - value: " + (
"<table: %d bytes>" % len(data) if len(data) >= 16 else str(values)
@ -814,7 +827,9 @@ class ImageFileDirectory_v2(MutableMapping):
logger.debug(msg)
# count is sum of lengths for string and arbitrary data
if typ in [TiffTags.BYTE, TiffTags.ASCII, TiffTags.UNDEFINED]:
if is_ifd:
count = 1
elif typ in [TiffTags.BYTE, TiffTags.ASCII, TiffTags.UNDEFINED]:
count = len(data)
else:
count = len(values)