forked from s444420/AL-2020
1917 lines
66 KiB
Python
1917 lines
66 KiB
Python
#
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# The Python Imaging Library.
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# $Id$
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#
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# TIFF file handling
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#
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# TIFF is a flexible, if somewhat aged, image file format originally
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# defined by Aldus. Although TIFF supports a wide variety of pixel
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# layouts and compression methods, the name doesn't really stand for
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# "thousands of incompatible file formats," it just feels that way.
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#
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# To read TIFF data from a stream, the stream must be seekable. For
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# progressive decoding, make sure to use TIFF files where the tag
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# directory is placed first in the file.
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#
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# History:
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# 1995-09-01 fl Created
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# 1996-05-04 fl Handle JPEGTABLES tag
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# 1996-05-18 fl Fixed COLORMAP support
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# 1997-01-05 fl Fixed PREDICTOR support
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# 1997-08-27 fl Added support for rational tags (from Perry Stoll)
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# 1998-01-10 fl Fixed seek/tell (from Jan Blom)
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# 1998-07-15 fl Use private names for internal variables
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# 1999-06-13 fl Rewritten for PIL 1.0 (1.0)
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# 2000-10-11 fl Additional fixes for Python 2.0 (1.1)
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# 2001-04-17 fl Fixed rewind support (seek to frame 0) (1.2)
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# 2001-05-12 fl Added write support for more tags (from Greg Couch) (1.3)
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# 2001-12-18 fl Added workaround for broken Matrox library
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# 2002-01-18 fl Don't mess up if photometric tag is missing (D. Alan Stewart)
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# 2003-05-19 fl Check FILLORDER tag
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# 2003-09-26 fl Added RGBa support
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# 2004-02-24 fl Added DPI support; fixed rational write support
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# 2005-02-07 fl Added workaround for broken Corel Draw 10 files
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# 2006-01-09 fl Added support for float/double tags (from Russell Nelson)
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#
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# Copyright (c) 1997-2006 by Secret Labs AB. All rights reserved.
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# Copyright (c) 1995-1997 by Fredrik Lundh
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#
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# See the README file for information on usage and redistribution.
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#
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import io
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import itertools
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import os
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import struct
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import warnings
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from collections.abc import MutableMapping
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from fractions import Fraction
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from numbers import Number, Rational
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from . import Image, ImageFile, ImagePalette, TiffTags
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from ._binary import i8, o8
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from .TiffTags import TYPES
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DEBUG = False # Needs to be merged with the new logging approach.
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# Set these to true to force use of libtiff for reading or writing.
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READ_LIBTIFF = False
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WRITE_LIBTIFF = False
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IFD_LEGACY_API = True
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II = b"II" # little-endian (Intel style)
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MM = b"MM" # big-endian (Motorola style)
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#
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# --------------------------------------------------------------------
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# Read TIFF files
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# a few tag names, just to make the code below a bit more readable
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IMAGEWIDTH = 256
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IMAGELENGTH = 257
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BITSPERSAMPLE = 258
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COMPRESSION = 259
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PHOTOMETRIC_INTERPRETATION = 262
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FILLORDER = 266
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IMAGEDESCRIPTION = 270
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STRIPOFFSETS = 273
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SAMPLESPERPIXEL = 277
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ROWSPERSTRIP = 278
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STRIPBYTECOUNTS = 279
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X_RESOLUTION = 282
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Y_RESOLUTION = 283
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PLANAR_CONFIGURATION = 284
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RESOLUTION_UNIT = 296
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TRANSFERFUNCTION = 301
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SOFTWARE = 305
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DATE_TIME = 306
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ARTIST = 315
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PREDICTOR = 317
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COLORMAP = 320
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TILEOFFSETS = 324
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EXTRASAMPLES = 338
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SAMPLEFORMAT = 339
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JPEGTABLES = 347
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REFERENCEBLACKWHITE = 532
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COPYRIGHT = 33432
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IPTC_NAA_CHUNK = 33723 # newsphoto properties
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PHOTOSHOP_CHUNK = 34377 # photoshop properties
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ICCPROFILE = 34675
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EXIFIFD = 34665
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XMP = 700
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JPEGQUALITY = 65537 # pseudo-tag by libtiff
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# https://github.com/imagej/ImageJA/blob/master/src/main/java/ij/io/TiffDecoder.java
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IMAGEJ_META_DATA_BYTE_COUNTS = 50838
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IMAGEJ_META_DATA = 50839
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COMPRESSION_INFO = {
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# Compression => pil compression name
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1: "raw",
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2: "tiff_ccitt",
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3: "group3",
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4: "group4",
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5: "tiff_lzw",
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6: "tiff_jpeg", # obsolete
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7: "jpeg",
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8: "tiff_adobe_deflate",
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32771: "tiff_raw_16", # 16-bit padding
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32773: "packbits",
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32809: "tiff_thunderscan",
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32946: "tiff_deflate",
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34676: "tiff_sgilog",
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34677: "tiff_sgilog24",
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34925: "lzma",
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50000: "zstd",
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50001: "webp",
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}
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COMPRESSION_INFO_REV = {v: k for k, v in COMPRESSION_INFO.items()}
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OPEN_INFO = {
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# (ByteOrder, PhotoInterpretation, SampleFormat, FillOrder, BitsPerSample,
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# ExtraSamples) => mode, rawmode
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(II, 0, (1,), 1, (1,), ()): ("1", "1;I"),
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(MM, 0, (1,), 1, (1,), ()): ("1", "1;I"),
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(II, 0, (1,), 2, (1,), ()): ("1", "1;IR"),
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(MM, 0, (1,), 2, (1,), ()): ("1", "1;IR"),
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(II, 1, (1,), 1, (1,), ()): ("1", "1"),
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(MM, 1, (1,), 1, (1,), ()): ("1", "1"),
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(II, 1, (1,), 2, (1,), ()): ("1", "1;R"),
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(MM, 1, (1,), 2, (1,), ()): ("1", "1;R"),
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(II, 0, (1,), 1, (2,), ()): ("L", "L;2I"),
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(MM, 0, (1,), 1, (2,), ()): ("L", "L;2I"),
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(II, 0, (1,), 2, (2,), ()): ("L", "L;2IR"),
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(MM, 0, (1,), 2, (2,), ()): ("L", "L;2IR"),
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(II, 1, (1,), 1, (2,), ()): ("L", "L;2"),
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(MM, 1, (1,), 1, (2,), ()): ("L", "L;2"),
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(II, 1, (1,), 2, (2,), ()): ("L", "L;2R"),
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(MM, 1, (1,), 2, (2,), ()): ("L", "L;2R"),
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(II, 0, (1,), 1, (4,), ()): ("L", "L;4I"),
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(MM, 0, (1,), 1, (4,), ()): ("L", "L;4I"),
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(II, 0, (1,), 2, (4,), ()): ("L", "L;4IR"),
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(MM, 0, (1,), 2, (4,), ()): ("L", "L;4IR"),
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(II, 1, (1,), 1, (4,), ()): ("L", "L;4"),
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(MM, 1, (1,), 1, (4,), ()): ("L", "L;4"),
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(II, 1, (1,), 2, (4,), ()): ("L", "L;4R"),
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(MM, 1, (1,), 2, (4,), ()): ("L", "L;4R"),
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(II, 0, (1,), 1, (8,), ()): ("L", "L;I"),
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(MM, 0, (1,), 1, (8,), ()): ("L", "L;I"),
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(II, 0, (1,), 2, (8,), ()): ("L", "L;IR"),
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(MM, 0, (1,), 2, (8,), ()): ("L", "L;IR"),
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(II, 1, (1,), 1, (8,), ()): ("L", "L"),
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(MM, 1, (1,), 1, (8,), ()): ("L", "L"),
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(II, 1, (1,), 2, (8,), ()): ("L", "L;R"),
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(MM, 1, (1,), 2, (8,), ()): ("L", "L;R"),
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(II, 1, (1,), 1, (12,), ()): ("I;16", "I;12"),
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(II, 1, (1,), 1, (16,), ()): ("I;16", "I;16"),
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(MM, 1, (1,), 1, (16,), ()): ("I;16B", "I;16B"),
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(II, 1, (2,), 1, (16,), ()): ("I", "I;16S"),
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(MM, 1, (2,), 1, (16,), ()): ("I", "I;16BS"),
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(II, 0, (3,), 1, (32,), ()): ("F", "F;32F"),
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(MM, 0, (3,), 1, (32,), ()): ("F", "F;32BF"),
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(II, 1, (1,), 1, (32,), ()): ("I", "I;32N"),
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(II, 1, (2,), 1, (32,), ()): ("I", "I;32S"),
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(MM, 1, (2,), 1, (32,), ()): ("I", "I;32BS"),
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(II, 1, (3,), 1, (32,), ()): ("F", "F;32F"),
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(MM, 1, (3,), 1, (32,), ()): ("F", "F;32BF"),
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(II, 1, (1,), 1, (8, 8), (2,)): ("LA", "LA"),
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(MM, 1, (1,), 1, (8, 8), (2,)): ("LA", "LA"),
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(II, 2, (1,), 1, (8, 8, 8), ()): ("RGB", "RGB"),
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(MM, 2, (1,), 1, (8, 8, 8), ()): ("RGB", "RGB"),
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(II, 2, (1,), 2, (8, 8, 8), ()): ("RGB", "RGB;R"),
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(MM, 2, (1,), 2, (8, 8, 8), ()): ("RGB", "RGB;R"),
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(II, 2, (1,), 1, (8, 8, 8, 8), ()): ("RGBA", "RGBA"), # missing ExtraSamples
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(MM, 2, (1,), 1, (8, 8, 8, 8), ()): ("RGBA", "RGBA"), # missing ExtraSamples
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(II, 2, (1,), 1, (8, 8, 8, 8), (0,)): ("RGBX", "RGBX"),
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(MM, 2, (1,), 1, (8, 8, 8, 8), (0,)): ("RGBX", "RGBX"),
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(II, 2, (1,), 1, (8, 8, 8, 8, 8), (0, 0)): ("RGBX", "RGBXX"),
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(MM, 2, (1,), 1, (8, 8, 8, 8, 8), (0, 0)): ("RGBX", "RGBXX"),
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(II, 2, (1,), 1, (8, 8, 8, 8, 8, 8), (0, 0, 0)): ("RGBX", "RGBXXX"),
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(MM, 2, (1,), 1, (8, 8, 8, 8, 8, 8), (0, 0, 0)): ("RGBX", "RGBXXX"),
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(II, 2, (1,), 1, (8, 8, 8, 8), (1,)): ("RGBA", "RGBa"),
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(MM, 2, (1,), 1, (8, 8, 8, 8), (1,)): ("RGBA", "RGBa"),
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(II, 2, (1,), 1, (8, 8, 8, 8, 8), (1, 0)): ("RGBA", "RGBaX"),
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(MM, 2, (1,), 1, (8, 8, 8, 8, 8), (1, 0)): ("RGBA", "RGBaX"),
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(II, 2, (1,), 1, (8, 8, 8, 8, 8, 8), (1, 0, 0)): ("RGBA", "RGBaXX"),
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(MM, 2, (1,), 1, (8, 8, 8, 8, 8, 8), (1, 0, 0)): ("RGBA", "RGBaXX"),
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(II, 2, (1,), 1, (8, 8, 8, 8), (2,)): ("RGBA", "RGBA"),
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(MM, 2, (1,), 1, (8, 8, 8, 8), (2,)): ("RGBA", "RGBA"),
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(II, 2, (1,), 1, (8, 8, 8, 8, 8), (2, 0)): ("RGBA", "RGBAX"),
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(MM, 2, (1,), 1, (8, 8, 8, 8, 8), (2, 0)): ("RGBA", "RGBAX"),
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(II, 2, (1,), 1, (8, 8, 8, 8, 8, 8), (2, 0, 0)): ("RGBA", "RGBAXX"),
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(MM, 2, (1,), 1, (8, 8, 8, 8, 8, 8), (2, 0, 0)): ("RGBA", "RGBAXX"),
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(II, 2, (1,), 1, (8, 8, 8, 8), (999,)): ("RGBA", "RGBA"), # Corel Draw 10
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(MM, 2, (1,), 1, (8, 8, 8, 8), (999,)): ("RGBA", "RGBA"), # Corel Draw 10
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(II, 2, (1,), 1, (16, 16, 16), ()): ("RGB", "RGB;16L"),
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(MM, 2, (1,), 1, (16, 16, 16), ()): ("RGB", "RGB;16B"),
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(II, 2, (1,), 1, (16, 16, 16, 16), ()): ("RGBA", "RGBA;16L"),
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(MM, 2, (1,), 1, (16, 16, 16, 16), ()): ("RGBA", "RGBA;16B"),
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(II, 2, (1,), 1, (16, 16, 16, 16), (0,)): ("RGBX", "RGBX;16L"),
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(MM, 2, (1,), 1, (16, 16, 16, 16), (0,)): ("RGBX", "RGBX;16B"),
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(II, 2, (1,), 1, (16, 16, 16, 16), (1,)): ("RGBA", "RGBa;16L"),
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(MM, 2, (1,), 1, (16, 16, 16, 16), (1,)): ("RGBA", "RGBa;16B"),
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(II, 2, (1,), 1, (16, 16, 16, 16), (2,)): ("RGBA", "RGBA;16L"),
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(MM, 2, (1,), 1, (16, 16, 16, 16), (2,)): ("RGBA", "RGBA;16B"),
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(II, 3, (1,), 1, (1,), ()): ("P", "P;1"),
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(MM, 3, (1,), 1, (1,), ()): ("P", "P;1"),
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(II, 3, (1,), 2, (1,), ()): ("P", "P;1R"),
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(MM, 3, (1,), 2, (1,), ()): ("P", "P;1R"),
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(II, 3, (1,), 1, (2,), ()): ("P", "P;2"),
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(MM, 3, (1,), 1, (2,), ()): ("P", "P;2"),
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(II, 3, (1,), 2, (2,), ()): ("P", "P;2R"),
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(MM, 3, (1,), 2, (2,), ()): ("P", "P;2R"),
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(II, 3, (1,), 1, (4,), ()): ("P", "P;4"),
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(MM, 3, (1,), 1, (4,), ()): ("P", "P;4"),
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(II, 3, (1,), 2, (4,), ()): ("P", "P;4R"),
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(MM, 3, (1,), 2, (4,), ()): ("P", "P;4R"),
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(II, 3, (1,), 1, (8,), ()): ("P", "P"),
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(MM, 3, (1,), 1, (8,), ()): ("P", "P"),
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(II, 3, (1,), 1, (8, 8), (2,)): ("PA", "PA"),
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(MM, 3, (1,), 1, (8, 8), (2,)): ("PA", "PA"),
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(II, 3, (1,), 2, (8,), ()): ("P", "P;R"),
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(MM, 3, (1,), 2, (8,), ()): ("P", "P;R"),
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(II, 5, (1,), 1, (8, 8, 8, 8), ()): ("CMYK", "CMYK"),
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(MM, 5, (1,), 1, (8, 8, 8, 8), ()): ("CMYK", "CMYK"),
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(II, 5, (1,), 1, (8, 8, 8, 8, 8), (0,)): ("CMYK", "CMYKX"),
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(MM, 5, (1,), 1, (8, 8, 8, 8, 8), (0,)): ("CMYK", "CMYKX"),
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(II, 5, (1,), 1, (8, 8, 8, 8, 8, 8), (0, 0)): ("CMYK", "CMYKXX"),
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(MM, 5, (1,), 1, (8, 8, 8, 8, 8, 8), (0, 0)): ("CMYK", "CMYKXX"),
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(II, 5, (1,), 1, (16, 16, 16, 16), ()): ("CMYK", "CMYK;16L"),
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# JPEG compressed images handled by LibTiff and auto-converted to RGBX
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# Minimal Baseline TIFF requires YCbCr images to have 3 SamplesPerPixel
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(II, 6, (1,), 1, (8, 8, 8), ()): ("RGB", "RGBX"),
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(MM, 6, (1,), 1, (8, 8, 8), ()): ("RGB", "RGBX"),
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(II, 8, (1,), 1, (8, 8, 8), ()): ("LAB", "LAB"),
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(MM, 8, (1,), 1, (8, 8, 8), ()): ("LAB", "LAB"),
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}
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PREFIXES = [
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b"MM\x00\x2A", # Valid TIFF header with big-endian byte order
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b"II\x2A\x00", # Valid TIFF header with little-endian byte order
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b"MM\x2A\x00", # Invalid TIFF header, assume big-endian
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b"II\x00\x2A", # Invalid TIFF header, assume little-endian
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]
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def _accept(prefix):
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return prefix[:4] in PREFIXES
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def _limit_rational(val, max_val):
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inv = abs(val) > 1
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n_d = IFDRational(1 / val if inv else val).limit_rational(max_val)
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return n_d[::-1] if inv else n_d
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def _limit_signed_rational(val, max_val, min_val):
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frac = Fraction(val)
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n_d = frac.numerator, frac.denominator
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if min(n_d) < min_val:
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n_d = _limit_rational(val, abs(min_val))
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if max(n_d) > max_val:
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val = Fraction(*n_d)
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n_d = _limit_rational(val, max_val)
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return n_d
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##
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# Wrapper for TIFF IFDs.
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_load_dispatch = {}
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_write_dispatch = {}
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class IFDRational(Rational):
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""" Implements a rational class where 0/0 is a legal value to match
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the in the wild use of exif rationals.
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e.g., DigitalZoomRatio - 0.00/0.00 indicates that no digital zoom was used
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"""
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""" If the denominator is 0, store this as a float('nan'), otherwise store
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as a fractions.Fraction(). Delegate as appropriate
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"""
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__slots__ = ("_numerator", "_denominator", "_val")
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def __init__(self, value, denominator=1):
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"""
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:param value: either an integer numerator, a
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float/rational/other number, or an IFDRational
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:param denominator: Optional integer denominator
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"""
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if isinstance(value, IFDRational):
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self._numerator = value.numerator
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self._denominator = value.denominator
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self._val = value._val
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return
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if isinstance(value, Fraction):
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self._numerator = value.numerator
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self._denominator = value.denominator
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else:
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self._numerator = value
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self._denominator = denominator
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if denominator == 0:
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self._val = float("nan")
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elif denominator == 1:
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self._val = Fraction(value)
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else:
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self._val = Fraction(value, denominator)
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@property
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def numerator(a):
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return a._numerator
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@property
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def denominator(a):
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return a._denominator
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def limit_rational(self, max_denominator):
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"""
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:param max_denominator: Integer, the maximum denominator value
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:returns: Tuple of (numerator, denominator)
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"""
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if self.denominator == 0:
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return (self.numerator, self.denominator)
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f = self._val.limit_denominator(max_denominator)
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return (f.numerator, f.denominator)
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def __repr__(self):
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return str(float(self._val))
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def __hash__(self):
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return self._val.__hash__()
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def __eq__(self, other):
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return self._val == other
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def _delegate(op):
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def delegate(self, *args):
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return getattr(self._val, op)(*args)
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return delegate
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""" a = ['add','radd', 'sub', 'rsub', 'mul', 'rmul',
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'truediv', 'rtruediv', 'floordiv', 'rfloordiv',
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'mod','rmod', 'pow','rpow', 'pos', 'neg',
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'abs', 'trunc', 'lt', 'gt', 'le', 'ge', 'bool',
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'ceil', 'floor', 'round']
|
|
print("\n".join("__%s__ = _delegate('__%s__')" % (s,s) for s in a))
|
|
"""
|
|
|
|
__add__ = _delegate("__add__")
|
|
__radd__ = _delegate("__radd__")
|
|
__sub__ = _delegate("__sub__")
|
|
__rsub__ = _delegate("__rsub__")
|
|
__mul__ = _delegate("__mul__")
|
|
__rmul__ = _delegate("__rmul__")
|
|
__truediv__ = _delegate("__truediv__")
|
|
__rtruediv__ = _delegate("__rtruediv__")
|
|
__floordiv__ = _delegate("__floordiv__")
|
|
__rfloordiv__ = _delegate("__rfloordiv__")
|
|
__mod__ = _delegate("__mod__")
|
|
__rmod__ = _delegate("__rmod__")
|
|
__pow__ = _delegate("__pow__")
|
|
__rpow__ = _delegate("__rpow__")
|
|
__pos__ = _delegate("__pos__")
|
|
__neg__ = _delegate("__neg__")
|
|
__abs__ = _delegate("__abs__")
|
|
__trunc__ = _delegate("__trunc__")
|
|
__lt__ = _delegate("__lt__")
|
|
__gt__ = _delegate("__gt__")
|
|
__le__ = _delegate("__le__")
|
|
__ge__ = _delegate("__ge__")
|
|
__bool__ = _delegate("__bool__")
|
|
__ceil__ = _delegate("__ceil__")
|
|
__floor__ = _delegate("__floor__")
|
|
__round__ = _delegate("__round__")
|
|
|
|
|
|
class ImageFileDirectory_v2(MutableMapping):
|
|
"""This class represents a TIFF tag directory. To speed things up, we
|
|
don't decode tags unless they're asked for.
|
|
|
|
Exposes a dictionary interface of the tags in the directory::
|
|
|
|
ifd = ImageFileDirectory_v2()
|
|
ifd[key] = 'Some Data'
|
|
ifd.tagtype[key] = TiffTags.ASCII
|
|
print(ifd[key])
|
|
'Some Data'
|
|
|
|
Individual values are returned as the strings or numbers, sequences are
|
|
returned as tuples of the values.
|
|
|
|
The tiff metadata type of each item is stored in a dictionary of
|
|
tag types in
|
|
`~PIL.TiffImagePlugin.ImageFileDirectory_v2.tagtype`. The types
|
|
are read from a tiff file, guessed from the type added, or added
|
|
manually.
|
|
|
|
Data Structures:
|
|
|
|
* self.tagtype = {}
|
|
|
|
* Key: numerical tiff tag number
|
|
* Value: integer corresponding to the data type from
|
|
~PIL.TiffTags.TYPES`
|
|
|
|
.. versionadded:: 3.0.0
|
|
"""
|
|
|
|
"""
|
|
Documentation:
|
|
|
|
'internal' data structures:
|
|
* self._tags_v2 = {} Key: numerical tiff tag number
|
|
Value: decoded data, as tuple for multiple values
|
|
* self._tagdata = {} Key: numerical tiff tag number
|
|
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.
|
|
|
|
Self.legacy_api is a value for internal use, and shouldn't be
|
|
changed from outside code. In cooperation with the
|
|
ImageFileDirectory_v1 class, if legacy_api is true, then decoded
|
|
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):
|
|
"""Initialize an ImageFileDirectory.
|
|
|
|
To construct an ImageFileDirectory from a real file, pass the 8-byte
|
|
magic header to the constructor. To only set the endianness, pass it
|
|
as the 'prefix' keyword argument.
|
|
|
|
:param ifh: One of the accepted magic headers (cf. PREFIXES); also sets
|
|
endianness.
|
|
:param prefix: Override the endianness of the file.
|
|
"""
|
|
if ifh[:4] not in PREFIXES:
|
|
raise SyntaxError("not a TIFF file (header %r not valid)" % ifh)
|
|
self._prefix = prefix if prefix is not None else ifh[:2]
|
|
if self._prefix == MM:
|
|
self._endian = ">"
|
|
elif self._prefix == II:
|
|
self._endian = "<"
|
|
else:
|
|
raise SyntaxError("not a TIFF IFD")
|
|
self.reset()
|
|
(self.next,) = self._unpack("L", ifh[4:])
|
|
self._legacy_api = False
|
|
|
|
prefix = property(lambda self: self._prefix)
|
|
offset = property(lambda self: self._offset)
|
|
legacy_api = property(lambda self: self._legacy_api)
|
|
|
|
@legacy_api.setter
|
|
def legacy_api(self, value):
|
|
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._tagdata = {}
|
|
self.tagtype = {} # added 2008-06-05 by Florian Hoech
|
|
self._next = None
|
|
self._offset = None
|
|
|
|
def __str__(self):
|
|
return str(dict(self))
|
|
|
|
def named(self):
|
|
"""
|
|
:returns: dict of name|key: value
|
|
|
|
Returns the complete tag dictionary, with named tags where possible.
|
|
"""
|
|
return {TiffTags.lookup(code).name: value for code, value in self.items()}
|
|
|
|
def __len__(self):
|
|
return len(set(self._tagdata) | set(self._tags_v2))
|
|
|
|
def __getitem__(self, tag):
|
|
if tag not in self._tags_v2: # unpack on the fly
|
|
data = self._tagdata[tag]
|
|
typ = self.tagtype[tag]
|
|
size, handler = self._load_dispatch[typ]
|
|
self[tag] = handler(self, data, self.legacy_api) # check type
|
|
val = self._tags_v2[tag]
|
|
if self.legacy_api and not isinstance(val, (tuple, bytes)):
|
|
val = (val,)
|
|
return val
|
|
|
|
def __contains__(self, tag):
|
|
return tag in self._tags_v2 or tag in self._tagdata
|
|
|
|
def __setitem__(self, tag, value):
|
|
self._setitem(tag, value, self.legacy_api)
|
|
|
|
def _setitem(self, tag, value, legacy_api):
|
|
basetypes = (Number, bytes, str)
|
|
|
|
info = TiffTags.lookup(tag)
|
|
values = [value] if isinstance(value, basetypes) else value
|
|
|
|
if tag not in self.tagtype:
|
|
if info.type:
|
|
self.tagtype[tag] = info.type
|
|
else:
|
|
self.tagtype[tag] = TiffTags.UNDEFINED
|
|
if all(isinstance(v, IFDRational) for v in values):
|
|
self.tagtype[tag] = (
|
|
TiffTags.RATIONAL
|
|
if all(v >= 0 for v in values)
|
|
else TiffTags.SIGNED_RATIONAL
|
|
)
|
|
elif all(isinstance(v, int) for v in values):
|
|
if all(0 <= v < 2 ** 16 for v in values):
|
|
self.tagtype[tag] = TiffTags.SHORT
|
|
elif all(-(2 ** 15) < v < 2 ** 15 for v in values):
|
|
self.tagtype[tag] = TiffTags.SIGNED_SHORT
|
|
else:
|
|
self.tagtype[tag] = (
|
|
TiffTags.LONG
|
|
if all(v >= 0 for v in values)
|
|
else TiffTags.SIGNED_LONG
|
|
)
|
|
elif all(isinstance(v, float) for v in values):
|
|
self.tagtype[tag] = TiffTags.DOUBLE
|
|
else:
|
|
if all(isinstance(v, str) for v in values):
|
|
self.tagtype[tag] = TiffTags.ASCII
|
|
|
|
if self.tagtype[tag] == TiffTags.UNDEFINED:
|
|
values = [
|
|
value.encode("ascii", "replace") if isinstance(value, str) else value
|
|
]
|
|
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)
|
|
|
|
dest = self._tags_v1 if legacy_api else self._tags_v2
|
|
|
|
# Three branches:
|
|
# Spec'd length == 1, Actual length 1, store as element
|
|
# 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 (info.length == 1) or (
|
|
info.length is None and len(values) == 1 and not legacy_api
|
|
):
|
|
# Don't mess with the legacy api, since it's frozen.
|
|
if legacy_api and self.tagtype[tag] in [
|
|
TiffTags.RATIONAL,
|
|
TiffTags.SIGNED_RATIONAL,
|
|
]: # rationals
|
|
values = (values,)
|
|
try:
|
|
(dest[tag],) = values
|
|
except ValueError:
|
|
# We've got a builtin tag with 1 expected entry
|
|
warnings.warn(
|
|
"Metadata Warning, tag %s had too many entries: %s, expected 1"
|
|
% (tag, len(values))
|
|
)
|
|
dest[tag] = values[0]
|
|
|
|
else:
|
|
# Spec'd length > 1 or undefined
|
|
# Unspec'd, and length > 1
|
|
dest[tag] = values
|
|
|
|
def __delitem__(self, tag):
|
|
self._tags_v2.pop(tag, None)
|
|
self._tags_v1.pop(tag, None)
|
|
self._tagdata.pop(tag, None)
|
|
|
|
def __iter__(self):
|
|
return iter(set(self._tagdata) | set(self._tags_v2))
|
|
|
|
def _unpack(self, fmt, data):
|
|
return struct.unpack(self._endian + fmt, data)
|
|
|
|
def _pack(self, fmt, *values):
|
|
return struct.pack(self._endian + fmt, *values)
|
|
|
|
def _register_loader(idx, size):
|
|
def decorator(func):
|
|
from .TiffTags import TYPES
|
|
|
|
if func.__name__.startswith("load_"):
|
|
TYPES[idx] = func.__name__[5:].replace("_", " ")
|
|
_load_dispatch[idx] = size, func # noqa: F821
|
|
return func
|
|
|
|
return decorator
|
|
|
|
def _register_writer(idx):
|
|
def decorator(func):
|
|
_write_dispatch[idx] = func # noqa: F821
|
|
return func
|
|
|
|
return decorator
|
|
|
|
def _register_basic(idx_fmt_name):
|
|
from .TiffTags import TYPES
|
|
|
|
idx, fmt, name = idx_fmt_name
|
|
TYPES[idx] = name
|
|
size = struct.calcsize("=" + fmt)
|
|
_load_dispatch[idx] = ( # noqa: F821
|
|
size,
|
|
lambda self, data, legacy_api=True: (
|
|
self._unpack("{}{}".format(len(data) // size, fmt), data)
|
|
),
|
|
)
|
|
_write_dispatch[idx] = lambda self, *values: ( # noqa: F821
|
|
b"".join(self._pack(fmt, value) for value in values)
|
|
)
|
|
|
|
list(
|
|
map(
|
|
_register_basic,
|
|
[
|
|
(TiffTags.SHORT, "H", "short"),
|
|
(TiffTags.LONG, "L", "long"),
|
|
(TiffTags.SIGNED_BYTE, "b", "signed byte"),
|
|
(TiffTags.SIGNED_SHORT, "h", "signed short"),
|
|
(TiffTags.SIGNED_LONG, "l", "signed long"),
|
|
(TiffTags.FLOAT, "f", "float"),
|
|
(TiffTags.DOUBLE, "d", "double"),
|
|
],
|
|
)
|
|
)
|
|
|
|
@_register_loader(1, 1) # Basic type, except for the legacy API.
|
|
def load_byte(self, data, legacy_api=True):
|
|
return data
|
|
|
|
@_register_writer(1) # Basic type, except for the legacy API.
|
|
def write_byte(self, data):
|
|
return data
|
|
|
|
@_register_loader(2, 1)
|
|
def load_string(self, data, legacy_api=True):
|
|
if data.endswith(b"\0"):
|
|
data = data[:-1]
|
|
return data.decode("latin-1", "replace")
|
|
|
|
@_register_writer(2)
|
|
def write_string(self, value):
|
|
# remerge of https://github.com/python-pillow/Pillow/pull/1416
|
|
return b"" + value.encode("ascii", "replace") + b"\0"
|
|
|
|
@_register_loader(5, 8)
|
|
def load_rational(self, data, legacy_api=True):
|
|
vals = self._unpack("{}L".format(len(data) // 4), data)
|
|
|
|
def combine(a, b):
|
|
return (a, b) if legacy_api else IFDRational(a, b)
|
|
|
|
return tuple(combine(num, denom) for num, denom in zip(vals[::2], vals[1::2]))
|
|
|
|
@_register_writer(5)
|
|
def write_rational(self, *values):
|
|
return b"".join(
|
|
self._pack("2L", *_limit_rational(frac, 2 ** 32 - 1)) for frac in values
|
|
)
|
|
|
|
@_register_loader(7, 1)
|
|
def load_undefined(self, data, legacy_api=True):
|
|
return data
|
|
|
|
@_register_writer(7)
|
|
def write_undefined(self, value):
|
|
return value
|
|
|
|
@_register_loader(10, 8)
|
|
def load_signed_rational(self, data, legacy_api=True):
|
|
vals = self._unpack("{}l".format(len(data) // 4), data)
|
|
|
|
def combine(a, b):
|
|
return (a, b) if legacy_api else IFDRational(a, b)
|
|
|
|
return tuple(combine(num, denom) for num, denom in zip(vals[::2], vals[1::2]))
|
|
|
|
@_register_writer(10)
|
|
def write_signed_rational(self, *values):
|
|
return b"".join(
|
|
self._pack("2l", *_limit_signed_rational(frac, 2 ** 31 - 1, -(2 ** 31)))
|
|
for frac in values
|
|
)
|
|
|
|
def _ensure_read(self, fp, size):
|
|
ret = fp.read(size)
|
|
if len(ret) != size:
|
|
raise OSError(
|
|
"Corrupt EXIF data. "
|
|
+ "Expecting to read %d bytes but only got %d. " % (size, len(ret))
|
|
)
|
|
return ret
|
|
|
|
def load(self, fp):
|
|
|
|
self.reset()
|
|
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))
|
|
if DEBUG:
|
|
tagname = TiffTags.lookup(tag).name
|
|
typname = TYPES.get(typ, "unknown")
|
|
print(
|
|
"tag: %s (%d) - type: %s (%d)" % (tagname, tag, typname, typ),
|
|
end=" ",
|
|
)
|
|
|
|
try:
|
|
unit_size, handler = self._load_dispatch[typ]
|
|
except KeyError:
|
|
if DEBUG:
|
|
print("- unsupported type", typ)
|
|
continue # ignore unsupported type
|
|
size = count * unit_size
|
|
if size > 4:
|
|
here = fp.tell()
|
|
(offset,) = self._unpack("L", data)
|
|
if DEBUG:
|
|
print(
|
|
"Tag Location: {} - Data Location: {}".format(here, offset),
|
|
end=" ",
|
|
)
|
|
fp.seek(offset)
|
|
data = ImageFile._safe_read(fp, size)
|
|
fp.seek(here)
|
|
else:
|
|
data = data[:size]
|
|
|
|
if len(data) != size:
|
|
warnings.warn(
|
|
"Possibly corrupt EXIF data. "
|
|
"Expecting to read %d bytes but only got %d."
|
|
" Skipping tag %s" % (size, len(data), tag)
|
|
)
|
|
continue
|
|
|
|
if not data:
|
|
continue
|
|
|
|
self._tagdata[tag] = data
|
|
self.tagtype[tag] = typ
|
|
|
|
if DEBUG:
|
|
if size > 32:
|
|
print("- value: <table: %d bytes>" % size)
|
|
else:
|
|
print("- value:", self[tag])
|
|
|
|
(self.next,) = self._unpack("L", self._ensure_read(fp, 4))
|
|
except OSError as msg:
|
|
warnings.warn(str(msg))
|
|
return
|
|
|
|
def tobytes(self, offset=0):
|
|
# FIXME What about tagdata?
|
|
result = self._pack("H", len(self._tags_v2))
|
|
|
|
entries = []
|
|
offset = offset + len(result) + len(self._tags_v2) * 12 + 4
|
|
stripoffsets = None
|
|
|
|
# pass 1: convert tags to binary format
|
|
# always write tags in ascending order
|
|
for tag, value in sorted(self._tags_v2.items()):
|
|
if tag == STRIPOFFSETS:
|
|
stripoffsets = len(entries)
|
|
typ = self.tagtype.get(tag)
|
|
if DEBUG:
|
|
print("Tag {}, Type: {}, Value: {}".format(tag, typ, value))
|
|
values = value if isinstance(value, tuple) else (value,)
|
|
data = self._write_dispatch[typ](self, *values)
|
|
if DEBUG:
|
|
tagname = TiffTags.lookup(tag).name
|
|
typname = TYPES.get(typ, "unknown")
|
|
print(
|
|
"save: %s (%d) - type: %s (%d)" % (tagname, tag, typname, typ),
|
|
end=" ",
|
|
)
|
|
if len(data) >= 16:
|
|
print("- value: <table: %d bytes>" % len(data))
|
|
else:
|
|
print("- value:", values)
|
|
|
|
# count is sum of lengths for string and arbitrary data
|
|
if typ in [TiffTags.BYTE, TiffTags.ASCII, TiffTags.UNDEFINED]:
|
|
count = len(data)
|
|
else:
|
|
count = len(values)
|
|
# figure out if data fits into the entry
|
|
if len(data) <= 4:
|
|
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
|
|
|
|
# update strip offset data to point beyond auxiliary data
|
|
if stripoffsets is not None:
|
|
tag, typ, count, value, data = entries[stripoffsets]
|
|
if data:
|
|
raise NotImplementedError("multistrip support not yet implemented")
|
|
value = self._pack("L", self._unpack("L", value)[0] + offset)
|
|
entries[stripoffsets] = tag, typ, count, value, data
|
|
|
|
# pass 2: write entries to file
|
|
for tag, typ, count, value, data in entries:
|
|
if DEBUG:
|
|
print(tag, typ, count, repr(value), repr(data))
|
|
result += self._pack("HHL4s", tag, typ, count, value)
|
|
|
|
# -- overwrite here for multi-page --
|
|
result += b"\0\0\0\0" # end of entries
|
|
|
|
# pass 3: write auxiliary data to file
|
|
for tag, typ, count, value, data in entries:
|
|
result += data
|
|
if len(data) & 1:
|
|
result += b"\0"
|
|
|
|
return result
|
|
|
|
def save(self, fp):
|
|
|
|
if fp.tell() == 0: # skip TIFF header on subsequent pages
|
|
# tiff header -- PIL always starts the first IFD at offset 8
|
|
fp.write(self._prefix + self._pack("HL", 42, 8))
|
|
|
|
offset = fp.tell()
|
|
result = self.tobytes(offset)
|
|
fp.write(result)
|
|
return offset + len(result)
|
|
|
|
|
|
ImageFileDirectory_v2._load_dispatch = _load_dispatch
|
|
ImageFileDirectory_v2._write_dispatch = _write_dispatch
|
|
for idx, name in TYPES.items():
|
|
name = name.replace(" ", "_")
|
|
setattr(ImageFileDirectory_v2, "load_" + name, _load_dispatch[idx][1])
|
|
setattr(ImageFileDirectory_v2, "write_" + name, _write_dispatch[idx])
|
|
del _load_dispatch, _write_dispatch, idx, name
|
|
|
|
|
|
# Legacy ImageFileDirectory support.
|
|
class ImageFileDirectory_v1(ImageFileDirectory_v2):
|
|
"""This class represents the **legacy** interface to a TIFF tag directory.
|
|
|
|
Exposes a dictionary interface of the tags in the directory::
|
|
|
|
ifd = ImageFileDirectory_v1()
|
|
ifd[key] = 'Some Data'
|
|
ifd.tagtype[key] = TiffTags.ASCII
|
|
print(ifd[key])
|
|
('Some Data',)
|
|
|
|
Also contains a dictionary of tag types as read from the tiff image file,
|
|
`~PIL.TiffImagePlugin.ImageFileDirectory_v1.tagtype`.
|
|
|
|
Values are returned as a tuple.
|
|
|
|
.. deprecated:: 3.0.0
|
|
"""
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
super().__init__(*args, **kwargs)
|
|
self._legacy_api = True
|
|
|
|
tags = property(lambda self: self._tags_v1)
|
|
tagdata = property(lambda self: self._tagdata)
|
|
|
|
@classmethod
|
|
def from_v2(cls, original):
|
|
""" Returns an
|
|
:py:class:`~PIL.TiffImagePlugin.ImageFileDirectory_v1`
|
|
instance with the same data as is contained in the original
|
|
:py:class:`~PIL.TiffImagePlugin.ImageFileDirectory_v2`
|
|
instance.
|
|
|
|
:returns: :py:class:`~PIL.TiffImagePlugin.ImageFileDirectory_v1`
|
|
|
|
"""
|
|
|
|
ifd = cls(prefix=original.prefix)
|
|
ifd._tagdata = original._tagdata
|
|
ifd.tagtype = original.tagtype
|
|
ifd.next = original.next # an indicator for multipage tiffs
|
|
return ifd
|
|
|
|
def to_v2(self):
|
|
""" Returns an
|
|
:py:class:`~PIL.TiffImagePlugin.ImageFileDirectory_v2`
|
|
instance with the same data as is contained in the original
|
|
:py:class:`~PIL.TiffImagePlugin.ImageFileDirectory_v1`
|
|
instance.
|
|
|
|
:returns: :py:class:`~PIL.TiffImagePlugin.ImageFileDirectory_v2`
|
|
|
|
"""
|
|
|
|
ifd = ImageFileDirectory_v2(prefix=self.prefix)
|
|
ifd._tagdata = dict(self._tagdata)
|
|
ifd.tagtype = dict(self.tagtype)
|
|
ifd._tags_v2 = dict(self._tags_v2)
|
|
return ifd
|
|
|
|
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))
|
|
|
|
def __iter__(self):
|
|
return iter(set(self._tagdata) | set(self._tags_v1))
|
|
|
|
def __setitem__(self, tag, value):
|
|
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]
|
|
typ = self.tagtype[tag]
|
|
size, handler = self._load_dispatch[typ]
|
|
for legacy in (False, True):
|
|
self._setitem(tag, handler(self, data, legacy), legacy)
|
|
val = self._tags_v1[tag]
|
|
if not isinstance(val, (tuple, bytes)):
|
|
val = (val,)
|
|
return val
|
|
|
|
|
|
# undone -- switch this pointer when IFD_LEGACY_API == False
|
|
ImageFileDirectory = ImageFileDirectory_v1
|
|
|
|
|
|
##
|
|
# Image plugin for TIFF files.
|
|
|
|
|
|
class TiffImageFile(ImageFile.ImageFile):
|
|
|
|
format = "TIFF"
|
|
format_description = "Adobe TIFF"
|
|
_close_exclusive_fp_after_loading = False
|
|
|
|
def _open(self):
|
|
"""Open the first image in a TIFF file"""
|
|
|
|
# Header
|
|
ifh = self.fp.read(8)
|
|
|
|
# image file directory (tag dictionary)
|
|
self.tag_v2 = ImageFileDirectory_v2(ifh)
|
|
|
|
# legacy tag/ifd entries will be filled in later
|
|
self.tag = self.ifd = None
|
|
|
|
# setup frame pointers
|
|
self.__first = self.__next = self.tag_v2.next
|
|
self.__frame = -1
|
|
self.__fp = self.fp
|
|
self._frame_pos = []
|
|
self._n_frames = None
|
|
|
|
if DEBUG:
|
|
print("*** TiffImageFile._open ***")
|
|
print("- __first:", self.__first)
|
|
print("- ifh: ", ifh)
|
|
|
|
# and load the first frame
|
|
self._seek(0)
|
|
|
|
@property
|
|
def n_frames(self):
|
|
if self._n_frames is None:
|
|
current = self.tell()
|
|
self._seek(len(self._frame_pos))
|
|
while self._n_frames is None:
|
|
self._seek(self.tell() + 1)
|
|
self.seek(current)
|
|
return self._n_frames
|
|
|
|
@property
|
|
def is_animated(self):
|
|
return self._is_animated
|
|
|
|
def seek(self, frame):
|
|
"""Select a given frame as current image"""
|
|
if not self._seek_check(frame):
|
|
return
|
|
self._seek(frame)
|
|
# Create a new core image object on second and
|
|
# subsequent frames in the image. Image may be
|
|
# different size/mode.
|
|
Image._decompression_bomb_check(self.size)
|
|
self.im = Image.core.new(self.mode, self.size)
|
|
|
|
def _seek(self, frame):
|
|
self.fp = self.__fp
|
|
while len(self._frame_pos) <= frame:
|
|
if not self.__next:
|
|
raise EOFError("no more images in TIFF file")
|
|
if DEBUG:
|
|
print(
|
|
"Seeking to frame %s, on frame %s, __next %s, location: %s"
|
|
% (frame, self.__frame, self.__next, self.fp.tell())
|
|
)
|
|
# reset buffered io handle in case fp
|
|
# was passed to libtiff, invalidating the buffer
|
|
self.fp.tell()
|
|
self.fp.seek(self.__next)
|
|
self._frame_pos.append(self.__next)
|
|
if DEBUG:
|
|
print("Loading tags, location: %s" % self.fp.tell())
|
|
self.tag_v2.load(self.fp)
|
|
self.__next = self.tag_v2.next
|
|
if self.__next == 0:
|
|
self._n_frames = frame + 1
|
|
if len(self._frame_pos) == 1:
|
|
self._is_animated = self.__next != 0
|
|
self.__frame += 1
|
|
self.fp.seek(self._frame_pos[frame])
|
|
self.tag_v2.load(self.fp)
|
|
# fill the legacy tag/ifd entries
|
|
self.tag = self.ifd = ImageFileDirectory_v1.from_v2(self.tag_v2)
|
|
self.__frame = frame
|
|
self._setup()
|
|
|
|
def tell(self):
|
|
"""Return the current frame number"""
|
|
return self.__frame
|
|
|
|
def load(self):
|
|
if self.use_load_libtiff:
|
|
return self._load_libtiff()
|
|
return super().load()
|
|
|
|
def load_end(self):
|
|
if self._tile_orientation:
|
|
method = {
|
|
2: Image.FLIP_LEFT_RIGHT,
|
|
3: Image.ROTATE_180,
|
|
4: Image.FLIP_TOP_BOTTOM,
|
|
5: Image.TRANSPOSE,
|
|
6: Image.ROTATE_270,
|
|
7: Image.TRANSVERSE,
|
|
8: Image.ROTATE_90,
|
|
}.get(self._tile_orientation)
|
|
if method is not None:
|
|
self.im = self.im.transpose(method)
|
|
self._size = self.im.size
|
|
|
|
# allow closing if we're on the first frame, there's no next
|
|
# This is the ImageFile.load path only, libtiff specific below.
|
|
if not self._is_animated:
|
|
self._close_exclusive_fp_after_loading = True
|
|
|
|
def _load_libtiff(self):
|
|
""" Overload method triggered when we detect a compressed tiff
|
|
Calls out to libtiff """
|
|
|
|
pixel = Image.Image.load(self)
|
|
|
|
if self.tile is None:
|
|
raise OSError("cannot load this image")
|
|
if not self.tile:
|
|
return pixel
|
|
|
|
self.load_prepare()
|
|
|
|
if not len(self.tile) == 1:
|
|
raise OSError("Not exactly one tile")
|
|
|
|
# (self._compression, (extents tuple),
|
|
# 0, (rawmode, self._compression, fp))
|
|
extents = self.tile[0][1]
|
|
args = list(self.tile[0][3])
|
|
|
|
# To be nice on memory footprint, if there's a
|
|
# file descriptor, use that instead of reading
|
|
# into a string in python.
|
|
# libtiff closes the file descriptor, so pass in a dup.
|
|
try:
|
|
fp = hasattr(self.fp, "fileno") and os.dup(self.fp.fileno())
|
|
# flush the file descriptor, prevents error on pypy 2.4+
|
|
# should also eliminate the need for fp.tell
|
|
# in _seek
|
|
if hasattr(self.fp, "flush"):
|
|
self.fp.flush()
|
|
except OSError:
|
|
# io.BytesIO have a fileno, but returns an IOError if
|
|
# it doesn't use a file descriptor.
|
|
fp = False
|
|
|
|
if fp:
|
|
args[2] = fp
|
|
|
|
decoder = Image._getdecoder(
|
|
self.mode, "libtiff", tuple(args), self.decoderconfig
|
|
)
|
|
try:
|
|
decoder.setimage(self.im, extents)
|
|
except ValueError:
|
|
raise OSError("Couldn't set the image")
|
|
|
|
close_self_fp = self._exclusive_fp and not self._is_animated
|
|
if hasattr(self.fp, "getvalue"):
|
|
# We've got a stringio like thing passed in. Yay for all in memory.
|
|
# The decoder needs the entire file in one shot, so there's not
|
|
# a lot we can do here other than give it the entire file.
|
|
# unless we could do something like get the address of the
|
|
# underlying string for stringio.
|
|
#
|
|
# Rearranging for supporting byteio items, since they have a fileno
|
|
# that returns an IOError if there's no underlying fp. Easier to
|
|
# deal with here by reordering.
|
|
if DEBUG:
|
|
print("have getvalue. just sending in a string from getvalue")
|
|
n, err = decoder.decode(self.fp.getvalue())
|
|
elif fp:
|
|
# we've got a actual file on disk, pass in the fp.
|
|
if DEBUG:
|
|
print("have fileno, calling fileno version of the decoder.")
|
|
if not close_self_fp:
|
|
self.fp.seek(0)
|
|
# 4 bytes, otherwise the trace might error out
|
|
n, err = decoder.decode(b"fpfp")
|
|
else:
|
|
# we have something else.
|
|
if DEBUG:
|
|
print("don't have fileno or getvalue. just reading")
|
|
self.fp.seek(0)
|
|
# UNDONE -- so much for that buffer size thing.
|
|
n, err = decoder.decode(self.fp.read())
|
|
|
|
self.tile = []
|
|
self.readonly = 0
|
|
|
|
self.load_end()
|
|
|
|
# libtiff closed the fp in a, we need to close self.fp, if possible
|
|
if close_self_fp:
|
|
self.fp.close()
|
|
self.fp = None # might be shared
|
|
|
|
if err < 0:
|
|
raise OSError(err)
|
|
|
|
return Image.Image.load(self)
|
|
|
|
def _setup(self):
|
|
"""Setup this image object based on current tags"""
|
|
|
|
if 0xBC01 in self.tag_v2:
|
|
raise OSError("Windows Media Photo files not yet supported")
|
|
|
|
# extract relevant tags
|
|
self._compression = COMPRESSION_INFO[self.tag_v2.get(COMPRESSION, 1)]
|
|
self._planar_configuration = self.tag_v2.get(PLANAR_CONFIGURATION, 1)
|
|
|
|
# photometric is a required tag, but not everyone is reading
|
|
# the specification
|
|
photo = self.tag_v2.get(PHOTOMETRIC_INTERPRETATION, 0)
|
|
|
|
# old style jpeg compression images most certainly are YCbCr
|
|
if self._compression == "tiff_jpeg":
|
|
photo = 6
|
|
|
|
fillorder = self.tag_v2.get(FILLORDER, 1)
|
|
|
|
if DEBUG:
|
|
print("*** Summary ***")
|
|
print("- compression:", self._compression)
|
|
print("- photometric_interpretation:", photo)
|
|
print("- planar_configuration:", self._planar_configuration)
|
|
print("- fill_order:", fillorder)
|
|
print("- YCbCr subsampling:", self.tag.get(530))
|
|
|
|
# size
|
|
xsize = int(self.tag_v2.get(IMAGEWIDTH))
|
|
ysize = int(self.tag_v2.get(IMAGELENGTH))
|
|
self._size = xsize, ysize
|
|
|
|
if DEBUG:
|
|
print("- size:", self.size)
|
|
|
|
sampleFormat = self.tag_v2.get(SAMPLEFORMAT, (1,))
|
|
if len(sampleFormat) > 1 and max(sampleFormat) == min(sampleFormat) == 1:
|
|
# SAMPLEFORMAT is properly per band, so an RGB image will
|
|
# be (1,1,1). But, we don't support per band pixel types,
|
|
# and anything more than one band is a uint8. So, just
|
|
# take the first element. Revisit this if adding support
|
|
# for more exotic images.
|
|
sampleFormat = (1,)
|
|
|
|
bps_tuple = self.tag_v2.get(BITSPERSAMPLE, (1,))
|
|
extra_tuple = self.tag_v2.get(EXTRASAMPLES, ())
|
|
if photo in (2, 6, 8): # RGB, YCbCr, LAB
|
|
bps_count = 3
|
|
elif photo == 5: # CMYK
|
|
bps_count = 4
|
|
else:
|
|
bps_count = 1
|
|
bps_count += len(extra_tuple)
|
|
# Some files have only one value in bps_tuple,
|
|
# while should have more. Fix it
|
|
if bps_count > len(bps_tuple) and len(bps_tuple) == 1:
|
|
bps_tuple = bps_tuple * bps_count
|
|
|
|
# mode: check photometric interpretation and bits per pixel
|
|
key = (
|
|
self.tag_v2.prefix,
|
|
photo,
|
|
sampleFormat,
|
|
fillorder,
|
|
bps_tuple,
|
|
extra_tuple,
|
|
)
|
|
if DEBUG:
|
|
print("format key:", key)
|
|
try:
|
|
self.mode, rawmode = OPEN_INFO[key]
|
|
except KeyError:
|
|
if DEBUG:
|
|
print("- unsupported format")
|
|
raise SyntaxError("unknown pixel mode")
|
|
|
|
if DEBUG:
|
|
print("- raw mode:", rawmode)
|
|
print("- pil mode:", self.mode)
|
|
|
|
self.info["compression"] = self._compression
|
|
|
|
xres = self.tag_v2.get(X_RESOLUTION, 1)
|
|
yres = self.tag_v2.get(Y_RESOLUTION, 1)
|
|
|
|
if xres and yres:
|
|
resunit = self.tag_v2.get(RESOLUTION_UNIT)
|
|
if resunit == 2: # dots per inch
|
|
self.info["dpi"] = int(xres + 0.5), int(yres + 0.5)
|
|
elif resunit == 3: # dots per centimeter. convert to dpi
|
|
self.info["dpi"] = int(xres * 2.54 + 0.5), int(yres * 2.54 + 0.5)
|
|
elif resunit is None: # used to default to 1, but now 2)
|
|
self.info["dpi"] = int(xres + 0.5), int(yres + 0.5)
|
|
# For backward compatibility,
|
|
# we also preserve the old behavior
|
|
self.info["resolution"] = xres, yres
|
|
else: # No absolute unit of measurement
|
|
self.info["resolution"] = xres, yres
|
|
|
|
# build tile descriptors
|
|
x = y = layer = 0
|
|
self.tile = []
|
|
self.use_load_libtiff = READ_LIBTIFF or self._compression != "raw"
|
|
if self.use_load_libtiff:
|
|
# Decoder expects entire file as one tile.
|
|
# There's a buffer size limit in load (64k)
|
|
# so large g4 images will fail if we use that
|
|
# function.
|
|
#
|
|
# Setup the one tile for the whole image, then
|
|
# use the _load_libtiff function.
|
|
|
|
# libtiff handles the fillmode for us, so 1;IR should
|
|
# actually be 1;I. Including the R double reverses the
|
|
# bits, so stripes of the image are reversed. See
|
|
# https://github.com/python-pillow/Pillow/issues/279
|
|
if fillorder == 2:
|
|
# Replace fillorder with fillorder=1
|
|
key = key[:3] + (1,) + key[4:]
|
|
if DEBUG:
|
|
print("format key:", key)
|
|
# this should always work, since all the
|
|
# fillorder==2 modes have a corresponding
|
|
# fillorder=1 mode
|
|
self.mode, rawmode = OPEN_INFO[key]
|
|
# libtiff always returns the bytes in native order.
|
|
# we're expecting image byte order. So, if the rawmode
|
|
# contains I;16, we need to convert from native to image
|
|
# byte order.
|
|
if rawmode == "I;16":
|
|
rawmode = "I;16N"
|
|
if ";16B" in rawmode:
|
|
rawmode = rawmode.replace(";16B", ";16N")
|
|
if ";16L" in rawmode:
|
|
rawmode = rawmode.replace(";16L", ";16N")
|
|
|
|
# Offset in the tile tuple is 0, we go from 0,0 to
|
|
# w,h, and we only do this once -- eds
|
|
a = (rawmode, self._compression, False, self.tag_v2.offset)
|
|
self.tile.append(("libtiff", (0, 0, xsize, ysize), 0, a))
|
|
|
|
elif STRIPOFFSETS in self.tag_v2 or TILEOFFSETS in self.tag_v2:
|
|
# striped image
|
|
if STRIPOFFSETS in self.tag_v2:
|
|
offsets = self.tag_v2[STRIPOFFSETS]
|
|
h = self.tag_v2.get(ROWSPERSTRIP, ysize)
|
|
w = self.size[0]
|
|
else:
|
|
# tiled image
|
|
offsets = self.tag_v2[TILEOFFSETS]
|
|
w = self.tag_v2.get(322)
|
|
h = self.tag_v2.get(323)
|
|
|
|
for offset in offsets:
|
|
if x + w > xsize:
|
|
stride = w * sum(bps_tuple) / 8 # bytes per line
|
|
else:
|
|
stride = 0
|
|
|
|
tile_rawmode = rawmode
|
|
if self._planar_configuration == 2:
|
|
# each band on it's own layer
|
|
tile_rawmode = rawmode[layer]
|
|
# adjust stride width accordingly
|
|
stride /= bps_count
|
|
|
|
a = (tile_rawmode, int(stride), 1)
|
|
self.tile.append(
|
|
(
|
|
self._compression,
|
|
(x, y, min(x + w, xsize), min(y + h, ysize)),
|
|
offset,
|
|
a,
|
|
)
|
|
)
|
|
x = x + w
|
|
if x >= self.size[0]:
|
|
x, y = 0, y + h
|
|
if y >= self.size[1]:
|
|
x = y = 0
|
|
layer += 1
|
|
else:
|
|
if DEBUG:
|
|
print("- unsupported data organization")
|
|
raise SyntaxError("unknown data organization")
|
|
|
|
# Fix up info.
|
|
if ICCPROFILE in self.tag_v2:
|
|
self.info["icc_profile"] = self.tag_v2[ICCPROFILE]
|
|
|
|
# fixup palette descriptor
|
|
|
|
if self.mode in ["P", "PA"]:
|
|
palette = [o8(b // 256) for b in self.tag_v2[COLORMAP]]
|
|
self.palette = ImagePalette.raw("RGB;L", b"".join(palette))
|
|
|
|
self._tile_orientation = self.tag_v2.get(0x0112)
|
|
|
|
def _close__fp(self):
|
|
try:
|
|
if self.__fp != self.fp:
|
|
self.__fp.close()
|
|
except AttributeError:
|
|
pass
|
|
finally:
|
|
self.__fp = None
|
|
|
|
|
|
#
|
|
# --------------------------------------------------------------------
|
|
# Write TIFF files
|
|
|
|
# little endian is default except for image modes with
|
|
# explicit big endian byte-order
|
|
|
|
SAVE_INFO = {
|
|
# mode => rawmode, byteorder, photometrics,
|
|
# sampleformat, bitspersample, extra
|
|
"1": ("1", II, 1, 1, (1,), None),
|
|
"L": ("L", II, 1, 1, (8,), None),
|
|
"LA": ("LA", II, 1, 1, (8, 8), 2),
|
|
"P": ("P", II, 3, 1, (8,), None),
|
|
"PA": ("PA", II, 3, 1, (8, 8), 2),
|
|
"I": ("I;32S", II, 1, 2, (32,), None),
|
|
"I;16": ("I;16", II, 1, 1, (16,), None),
|
|
"I;16S": ("I;16S", II, 1, 2, (16,), None),
|
|
"F": ("F;32F", II, 1, 3, (32,), None),
|
|
"RGB": ("RGB", II, 2, 1, (8, 8, 8), None),
|
|
"RGBX": ("RGBX", II, 2, 1, (8, 8, 8, 8), 0),
|
|
"RGBA": ("RGBA", II, 2, 1, (8, 8, 8, 8), 2),
|
|
"CMYK": ("CMYK", II, 5, 1, (8, 8, 8, 8), None),
|
|
"YCbCr": ("YCbCr", II, 6, 1, (8, 8, 8), None),
|
|
"LAB": ("LAB", II, 8, 1, (8, 8, 8), None),
|
|
"I;32BS": ("I;32BS", MM, 1, 2, (32,), None),
|
|
"I;16B": ("I;16B", MM, 1, 1, (16,), None),
|
|
"I;16BS": ("I;16BS", MM, 1, 2, (16,), None),
|
|
"F;32BF": ("F;32BF", MM, 1, 3, (32,), None),
|
|
}
|
|
|
|
|
|
def _save(im, fp, filename):
|
|
|
|
try:
|
|
rawmode, prefix, photo, format, bits, extra = SAVE_INFO[im.mode]
|
|
except KeyError:
|
|
raise OSError("cannot write mode %s as TIFF" % im.mode)
|
|
|
|
ifd = ImageFileDirectory_v2(prefix=prefix)
|
|
|
|
compression = im.encoderinfo.get("compression", im.info.get("compression"))
|
|
if compression is None:
|
|
compression = "raw"
|
|
|
|
libtiff = WRITE_LIBTIFF or compression != "raw"
|
|
|
|
# required for color libtiff images
|
|
ifd[PLANAR_CONFIGURATION] = getattr(im, "_planar_configuration", 1)
|
|
|
|
ifd[IMAGEWIDTH] = im.size[0]
|
|
ifd[IMAGELENGTH] = im.size[1]
|
|
|
|
# write any arbitrary tags passed in as an ImageFileDirectory
|
|
info = im.encoderinfo.get("tiffinfo", {})
|
|
if DEBUG:
|
|
print("Tiffinfo Keys: %s" % list(info))
|
|
if isinstance(info, ImageFileDirectory_v1):
|
|
info = info.to_v2()
|
|
for key in info:
|
|
ifd[key] = info.get(key)
|
|
try:
|
|
ifd.tagtype[key] = info.tagtype[key]
|
|
except Exception:
|
|
pass # might not be an IFD. Might not have populated type
|
|
|
|
# additions written by Greg Couch, gregc@cgl.ucsf.edu
|
|
# inspired by image-sig posting from Kevin Cazabon, kcazabon@home.com
|
|
if hasattr(im, "tag_v2"):
|
|
# preserve tags from original TIFF image file
|
|
for key in (
|
|
RESOLUTION_UNIT,
|
|
X_RESOLUTION,
|
|
Y_RESOLUTION,
|
|
IPTC_NAA_CHUNK,
|
|
PHOTOSHOP_CHUNK,
|
|
XMP,
|
|
):
|
|
if key in im.tag_v2:
|
|
ifd[key] = im.tag_v2[key]
|
|
ifd.tagtype[key] = im.tag_v2.tagtype[key]
|
|
|
|
# preserve ICC profile (should also work when saving other formats
|
|
# which support profiles as TIFF) -- 2008-06-06 Florian Hoech
|
|
if "icc_profile" in im.info:
|
|
ifd[ICCPROFILE] = im.info["icc_profile"]
|
|
|
|
for key, name in [
|
|
(IMAGEDESCRIPTION, "description"),
|
|
(X_RESOLUTION, "resolution"),
|
|
(Y_RESOLUTION, "resolution"),
|
|
(X_RESOLUTION, "x_resolution"),
|
|
(Y_RESOLUTION, "y_resolution"),
|
|
(RESOLUTION_UNIT, "resolution_unit"),
|
|
(SOFTWARE, "software"),
|
|
(DATE_TIME, "date_time"),
|
|
(ARTIST, "artist"),
|
|
(COPYRIGHT, "copyright"),
|
|
]:
|
|
if name in im.encoderinfo:
|
|
ifd[key] = im.encoderinfo[name]
|
|
|
|
dpi = im.encoderinfo.get("dpi")
|
|
if dpi:
|
|
ifd[RESOLUTION_UNIT] = 2
|
|
ifd[X_RESOLUTION] = int(dpi[0] + 0.5)
|
|
ifd[Y_RESOLUTION] = int(dpi[1] + 0.5)
|
|
|
|
if bits != (1,):
|
|
ifd[BITSPERSAMPLE] = bits
|
|
if len(bits) != 1:
|
|
ifd[SAMPLESPERPIXEL] = len(bits)
|
|
if extra is not None:
|
|
ifd[EXTRASAMPLES] = extra
|
|
if format != 1:
|
|
ifd[SAMPLEFORMAT] = format
|
|
|
|
ifd[PHOTOMETRIC_INTERPRETATION] = photo
|
|
|
|
if im.mode in ["P", "PA"]:
|
|
lut = im.im.getpalette("RGB", "RGB;L")
|
|
ifd[COLORMAP] = tuple(i8(v) * 256 for v in lut)
|
|
# data orientation
|
|
stride = len(bits) * ((im.size[0] * bits[0] + 7) // 8)
|
|
ifd[ROWSPERSTRIP] = im.size[1]
|
|
ifd[STRIPBYTECOUNTS] = stride * im.size[1]
|
|
ifd[STRIPOFFSETS] = 0 # this is adjusted by IFD writer
|
|
# no compression by default:
|
|
ifd[COMPRESSION] = COMPRESSION_INFO_REV.get(compression, 1)
|
|
|
|
if libtiff:
|
|
if "quality" in im.encoderinfo:
|
|
quality = im.encoderinfo["quality"]
|
|
if not isinstance(quality, int) or quality < 0 or quality > 100:
|
|
raise ValueError("Invalid quality setting")
|
|
if compression != "jpeg":
|
|
raise ValueError(
|
|
"quality setting only supported for 'jpeg' compression"
|
|
)
|
|
ifd[JPEGQUALITY] = quality
|
|
|
|
if DEBUG:
|
|
print("Saving using libtiff encoder")
|
|
print("Items: %s" % sorted(ifd.items()))
|
|
_fp = 0
|
|
if hasattr(fp, "fileno"):
|
|
try:
|
|
fp.seek(0)
|
|
_fp = os.dup(fp.fileno())
|
|
except io.UnsupportedOperation:
|
|
pass
|
|
|
|
# optional types for non core tags
|
|
types = {}
|
|
# SAMPLEFORMAT is determined by the image format and should not be copied
|
|
# from legacy_ifd.
|
|
# STRIPOFFSETS and STRIPBYTECOUNTS are added by the library
|
|
# based on the data in the strip.
|
|
# The other tags expect arrays with a certain length (fixed or depending on
|
|
# BITSPERSAMPLE, etc), passing arrays with a different length will result in
|
|
# segfaults. Block these tags until we add extra validation.
|
|
blocklist = [
|
|
COLORMAP,
|
|
REFERENCEBLACKWHITE,
|
|
SAMPLEFORMAT,
|
|
STRIPBYTECOUNTS,
|
|
STRIPOFFSETS,
|
|
TRANSFERFUNCTION,
|
|
]
|
|
|
|
atts = {}
|
|
# bits per sample is a single short in the tiff directory, not a list.
|
|
atts[BITSPERSAMPLE] = bits[0]
|
|
# Merge the ones that we have with (optional) more bits from
|
|
# the original file, e.g x,y resolution so that we can
|
|
# save(load('')) == original file.
|
|
legacy_ifd = {}
|
|
if hasattr(im, "tag"):
|
|
legacy_ifd = im.tag.to_v2()
|
|
for tag, value in itertools.chain(
|
|
ifd.items(), getattr(im, "tag_v2", {}).items(), legacy_ifd.items()
|
|
):
|
|
# Libtiff can only process certain core items without adding
|
|
# them to the custom dictionary.
|
|
# Custom items are supported for int, float, unicode, string and byte
|
|
# values. Other types and tuples require a tagtype.
|
|
if tag not in TiffTags.LIBTIFF_CORE:
|
|
if (
|
|
TiffTags.lookup(tag).type == TiffTags.UNDEFINED
|
|
or not Image.core.libtiff_support_custom_tags
|
|
):
|
|
continue
|
|
|
|
if tag in ifd.tagtype:
|
|
types[tag] = ifd.tagtype[tag]
|
|
elif not (isinstance(value, (int, float, str, bytes))):
|
|
continue
|
|
if tag not in atts and tag not in blocklist:
|
|
if isinstance(value, str):
|
|
atts[tag] = value.encode("ascii", "replace") + b"\0"
|
|
elif isinstance(value, IFDRational):
|
|
atts[tag] = float(value)
|
|
else:
|
|
atts[tag] = value
|
|
|
|
if DEBUG:
|
|
print("Converted items: %s" % sorted(atts.items()))
|
|
|
|
# libtiff always expects the bytes in native order.
|
|
# we're storing image byte order. So, if the rawmode
|
|
# contains I;16, we need to convert from native to image
|
|
# byte order.
|
|
if im.mode in ("I;16B", "I;16"):
|
|
rawmode = "I;16N"
|
|
|
|
# Pass tags as sorted list so that the tags are set in a fixed order.
|
|
# This is required by libtiff for some tags. For example, the JPEGQUALITY
|
|
# pseudo tag requires that the COMPRESS tag was already set.
|
|
tags = list(atts.items())
|
|
tags.sort()
|
|
a = (rawmode, compression, _fp, filename, tags, types)
|
|
e = Image._getencoder(im.mode, "libtiff", a, im.encoderconfig)
|
|
e.setimage(im.im, (0, 0) + im.size)
|
|
while True:
|
|
# undone, change to self.decodermaxblock:
|
|
l, s, d = e.encode(16 * 1024)
|
|
if not _fp:
|
|
fp.write(d)
|
|
if s:
|
|
break
|
|
if s < 0:
|
|
raise OSError("encoder error %d when writing image file" % s)
|
|
|
|
else:
|
|
offset = ifd.save(fp)
|
|
|
|
ImageFile._save(
|
|
im, fp, [("raw", (0, 0) + im.size, offset, (rawmode, stride, 1))]
|
|
)
|
|
|
|
# -- helper for multi-page save --
|
|
if "_debug_multipage" in im.encoderinfo:
|
|
# just to access o32 and o16 (using correct byte order)
|
|
im._debug_multipage = ifd
|
|
|
|
|
|
class AppendingTiffWriter:
|
|
fieldSizes = [
|
|
0, # None
|
|
1, # byte
|
|
1, # ascii
|
|
2, # short
|
|
4, # long
|
|
8, # rational
|
|
1, # sbyte
|
|
1, # undefined
|
|
2, # sshort
|
|
4, # slong
|
|
8, # srational
|
|
4, # float
|
|
8, # double
|
|
]
|
|
|
|
# StripOffsets = 273
|
|
# FreeOffsets = 288
|
|
# TileOffsets = 324
|
|
# JPEGQTables = 519
|
|
# JPEGDCTables = 520
|
|
# JPEGACTables = 521
|
|
Tags = {273, 288, 324, 519, 520, 521}
|
|
|
|
def __init__(self, fn, new=False):
|
|
if hasattr(fn, "read"):
|
|
self.f = fn
|
|
self.close_fp = False
|
|
else:
|
|
self.name = fn
|
|
self.close_fp = True
|
|
try:
|
|
self.f = open(fn, "w+b" if new else "r+b")
|
|
except OSError:
|
|
self.f = open(fn, "w+b")
|
|
self.beginning = self.f.tell()
|
|
self.setup()
|
|
|
|
def setup(self):
|
|
# Reset everything.
|
|
self.f.seek(self.beginning, os.SEEK_SET)
|
|
|
|
self.whereToWriteNewIFDOffset = None
|
|
self.offsetOfNewPage = 0
|
|
|
|
self.IIMM = IIMM = self.f.read(4)
|
|
if not IIMM:
|
|
# empty file - first page
|
|
self.isFirst = True
|
|
return
|
|
|
|
self.isFirst = False
|
|
if IIMM == b"II\x2a\x00":
|
|
self.setEndian("<")
|
|
elif IIMM == b"MM\x00\x2a":
|
|
self.setEndian(">")
|
|
else:
|
|
raise RuntimeError("Invalid TIFF file header")
|
|
|
|
self.skipIFDs()
|
|
self.goToEnd()
|
|
|
|
def finalize(self):
|
|
if self.isFirst:
|
|
return
|
|
|
|
# fix offsets
|
|
self.f.seek(self.offsetOfNewPage)
|
|
|
|
IIMM = self.f.read(4)
|
|
if not IIMM:
|
|
# raise RuntimeError("nothing written into new page")
|
|
# Make it easy to finish a frame without committing to a new one.
|
|
return
|
|
|
|
if IIMM != self.IIMM:
|
|
raise RuntimeError("IIMM of new page doesn't match IIMM of first page")
|
|
|
|
IFDoffset = self.readLong()
|
|
IFDoffset += self.offsetOfNewPage
|
|
self.f.seek(self.whereToWriteNewIFDOffset)
|
|
self.writeLong(IFDoffset)
|
|
self.f.seek(IFDoffset)
|
|
self.fixIFD()
|
|
|
|
def newFrame(self):
|
|
# Call this to finish a frame.
|
|
self.finalize()
|
|
self.setup()
|
|
|
|
def __enter__(self):
|
|
return self
|
|
|
|
def __exit__(self, exc_type, exc_value, traceback):
|
|
if self.close_fp:
|
|
self.close()
|
|
return False
|
|
|
|
def tell(self):
|
|
return self.f.tell() - self.offsetOfNewPage
|
|
|
|
def seek(self, offset, whence=io.SEEK_SET):
|
|
if whence == os.SEEK_SET:
|
|
offset += self.offsetOfNewPage
|
|
|
|
self.f.seek(offset, whence)
|
|
return self.tell()
|
|
|
|
def goToEnd(self):
|
|
self.f.seek(0, os.SEEK_END)
|
|
pos = self.f.tell()
|
|
|
|
# pad to 16 byte boundary
|
|
padBytes = 16 - pos % 16
|
|
if 0 < padBytes < 16:
|
|
self.f.write(bytes(padBytes))
|
|
self.offsetOfNewPage = self.f.tell()
|
|
|
|
def setEndian(self, endian):
|
|
self.endian = endian
|
|
self.longFmt = self.endian + "L"
|
|
self.shortFmt = self.endian + "H"
|
|
self.tagFormat = self.endian + "HHL"
|
|
|
|
def skipIFDs(self):
|
|
while True:
|
|
IFDoffset = self.readLong()
|
|
if IFDoffset == 0:
|
|
self.whereToWriteNewIFDOffset = self.f.tell() - 4
|
|
break
|
|
|
|
self.f.seek(IFDoffset)
|
|
numTags = self.readShort()
|
|
self.f.seek(numTags * 12, os.SEEK_CUR)
|
|
|
|
def write(self, data):
|
|
return self.f.write(data)
|
|
|
|
def readShort(self):
|
|
(value,) = struct.unpack(self.shortFmt, self.f.read(2))
|
|
return value
|
|
|
|
def readLong(self):
|
|
(value,) = struct.unpack(self.longFmt, self.f.read(4))
|
|
return value
|
|
|
|
def rewriteLastShortToLong(self, value):
|
|
self.f.seek(-2, os.SEEK_CUR)
|
|
bytesWritten = self.f.write(struct.pack(self.longFmt, value))
|
|
if bytesWritten is not None and bytesWritten != 4:
|
|
raise RuntimeError("wrote only %u bytes but wanted 4" % bytesWritten)
|
|
|
|
def rewriteLastShort(self, value):
|
|
self.f.seek(-2, os.SEEK_CUR)
|
|
bytesWritten = self.f.write(struct.pack(self.shortFmt, value))
|
|
if bytesWritten is not None and bytesWritten != 2:
|
|
raise RuntimeError("wrote only %u bytes but wanted 2" % bytesWritten)
|
|
|
|
def rewriteLastLong(self, value):
|
|
self.f.seek(-4, os.SEEK_CUR)
|
|
bytesWritten = self.f.write(struct.pack(self.longFmt, value))
|
|
if bytesWritten is not None and bytesWritten != 4:
|
|
raise RuntimeError("wrote only %u bytes but wanted 4" % bytesWritten)
|
|
|
|
def writeShort(self, value):
|
|
bytesWritten = self.f.write(struct.pack(self.shortFmt, value))
|
|
if bytesWritten is not None and bytesWritten != 2:
|
|
raise RuntimeError("wrote only %u bytes but wanted 2" % bytesWritten)
|
|
|
|
def writeLong(self, value):
|
|
bytesWritten = self.f.write(struct.pack(self.longFmt, value))
|
|
if bytesWritten is not None and bytesWritten != 4:
|
|
raise RuntimeError("wrote only %u bytes but wanted 4" % bytesWritten)
|
|
|
|
def close(self):
|
|
self.finalize()
|
|
self.f.close()
|
|
|
|
def fixIFD(self):
|
|
numTags = self.readShort()
|
|
|
|
for i in range(numTags):
|
|
tag, fieldType, count = struct.unpack(self.tagFormat, self.f.read(8))
|
|
|
|
fieldSize = self.fieldSizes[fieldType]
|
|
totalSize = fieldSize * count
|
|
isLocal = totalSize <= 4
|
|
if not isLocal:
|
|
offset = self.readLong()
|
|
offset += self.offsetOfNewPage
|
|
self.rewriteLastLong(offset)
|
|
|
|
if tag in self.Tags:
|
|
curPos = self.f.tell()
|
|
|
|
if isLocal:
|
|
self.fixOffsets(
|
|
count, isShort=(fieldSize == 2), isLong=(fieldSize == 4)
|
|
)
|
|
self.f.seek(curPos + 4)
|
|
else:
|
|
self.f.seek(offset)
|
|
self.fixOffsets(
|
|
count, isShort=(fieldSize == 2), isLong=(fieldSize == 4)
|
|
)
|
|
self.f.seek(curPos)
|
|
|
|
offset = curPos = None
|
|
|
|
elif isLocal:
|
|
# skip the locally stored value that is not an offset
|
|
self.f.seek(4, os.SEEK_CUR)
|
|
|
|
def fixOffsets(self, count, isShort=False, isLong=False):
|
|
if not isShort and not isLong:
|
|
raise RuntimeError("offset is neither short nor long")
|
|
|
|
for i in range(count):
|
|
offset = self.readShort() if isShort else self.readLong()
|
|
offset += self.offsetOfNewPage
|
|
if isShort and offset >= 65536:
|
|
# offset is now too large - we must convert shorts to longs
|
|
if count != 1:
|
|
raise RuntimeError("not implemented") # XXX TODO
|
|
|
|
# simple case - the offset is just one and therefore it is
|
|
# local (not referenced with another offset)
|
|
self.rewriteLastShortToLong(offset)
|
|
self.f.seek(-10, os.SEEK_CUR)
|
|
self.writeShort(TiffTags.LONG) # rewrite the type to LONG
|
|
self.f.seek(8, os.SEEK_CUR)
|
|
elif isShort:
|
|
self.rewriteLastShort(offset)
|
|
else:
|
|
self.rewriteLastLong(offset)
|
|
|
|
|
|
def _save_all(im, fp, filename):
|
|
encoderinfo = im.encoderinfo.copy()
|
|
encoderconfig = im.encoderconfig
|
|
append_images = list(encoderinfo.get("append_images", []))
|
|
if not hasattr(im, "n_frames") and not append_images:
|
|
return _save(im, fp, filename)
|
|
|
|
cur_idx = im.tell()
|
|
try:
|
|
with AppendingTiffWriter(fp) as tf:
|
|
for ims in [im] + append_images:
|
|
ims.encoderinfo = encoderinfo
|
|
ims.encoderconfig = encoderconfig
|
|
if not hasattr(ims, "n_frames"):
|
|
nfr = 1
|
|
else:
|
|
nfr = ims.n_frames
|
|
|
|
for idx in range(nfr):
|
|
ims.seek(idx)
|
|
ims.load()
|
|
_save(ims, tf, filename)
|
|
tf.newFrame()
|
|
finally:
|
|
im.seek(cur_idx)
|
|
|
|
|
|
#
|
|
# --------------------------------------------------------------------
|
|
# Register
|
|
|
|
Image.register_open(TiffImageFile.format, TiffImageFile, _accept)
|
|
Image.register_save(TiffImageFile.format, _save)
|
|
Image.register_save_all(TiffImageFile.format, _save_all)
|
|
|
|
Image.register_extensions(TiffImageFile.format, [".tif", ".tiff"])
|
|
|
|
Image.register_mime(TiffImageFile.format, "image/tiff")
|