mirror of
https://github.com/python-pillow/Pillow.git
synced 2024-12-26 18:06:18 +03:00
c68044bf7f
when the jpeg encoder sees the flags optimize or progressive (or progression) it will write the full image in one shot. The bufsize needs to be big enough to hold the entire image. The current heuristic is that the entire compressed image will fit in width * height bytes, but this heuristic is only applied to save operations with the flag "optimize" and not to save operations with the flag "progressive". This patch fixes this oversight. (Btw, it will probably be a good idea to have a loop that retries with a bigger bufsize in case this guess is not big enough.)
593 lines
20 KiB
Python
593 lines
20 KiB
Python
#
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# The Python Imaging Library.
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# $Id$
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#
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# JPEG (JFIF) file handling
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#
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# See "Digital Compression and Coding of Continous-Tone Still Images,
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# Part 1, Requirements and Guidelines" (CCITT T.81 / ISO 10918-1)
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#
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# History:
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# 1995-09-09 fl Created
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# 1995-09-13 fl Added full parser
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# 1996-03-25 fl Added hack to use the IJG command line utilities
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# 1996-05-05 fl Workaround Photoshop 2.5 CMYK polarity bug
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# 1996-05-28 fl Added draft support, JFIF version (0.1)
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# 1996-12-30 fl Added encoder options, added progression property (0.2)
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# 1997-08-27 fl Save mode 1 images as BW (0.3)
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# 1998-07-12 fl Added YCbCr to draft and save methods (0.4)
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# 1998-10-19 fl Don't hang on files using 16-bit DQT's (0.4.1)
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# 2001-04-16 fl Extract DPI settings from JFIF files (0.4.2)
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# 2002-07-01 fl Skip pad bytes before markers; identify Exif files (0.4.3)
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# 2003-04-25 fl Added experimental EXIF decoder (0.5)
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# 2003-06-06 fl Added experimental EXIF GPSinfo decoder
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# 2003-09-13 fl Extract COM markers
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# 2009-09-06 fl Added icc_profile support (from Florian Hoech)
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# 2009-03-06 fl Changed CMYK handling; always use Adobe polarity (0.6)
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# 2009-03-08 fl Added subsampling support (from Justin Huff).
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#
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# Copyright (c) 1997-2003 by Secret Labs AB.
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# Copyright (c) 1995-1996 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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__version__ = "0.6"
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import array, struct
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from PIL import Image, ImageFile, _binary
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from PIL.JpegPresets import presets
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from PIL._util import isStringType
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i8 = _binary.i8
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o8 = _binary.o8
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i16 = _binary.i16be
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i32 = _binary.i32be
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#
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# Parser
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def Skip(self, marker):
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n = i16(self.fp.read(2))-2
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ImageFile._safe_read(self.fp, n)
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def APP(self, marker):
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#
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# Application marker. Store these in the APP dictionary.
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# Also look for well-known application markers.
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n = i16(self.fp.read(2))-2
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s = ImageFile._safe_read(self.fp, n)
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app = "APP%d" % (marker&15)
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self.app[app] = s # compatibility
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self.applist.append((app, s))
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if marker == 0xFFE0 and s[:4] == b"JFIF":
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# extract JFIF information
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self.info["jfif"] = version = i16(s, 5) # version
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self.info["jfif_version"] = divmod(version, 256)
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# extract JFIF properties
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try:
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jfif_unit = i8(s[7])
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jfif_density = i16(s, 8), i16(s, 10)
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except:
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pass
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else:
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if jfif_unit == 1:
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self.info["dpi"] = jfif_density
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self.info["jfif_unit"] = jfif_unit
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self.info["jfif_density"] = jfif_density
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elif marker == 0xFFE1 and s[:5] == b"Exif\0":
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# extract Exif information (incomplete)
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self.info["exif"] = s # FIXME: value will change
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elif marker == 0xFFE2 and s[:5] == b"FPXR\0":
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# extract FlashPix information (incomplete)
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self.info["flashpix"] = s # FIXME: value will change
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elif marker == 0xFFE2 and s[:12] == b"ICC_PROFILE\0":
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# Since an ICC profile can be larger than the maximum size of
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# a JPEG marker (64K), we need provisions to split it into
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# multiple markers. The format defined by the ICC specifies
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# one or more APP2 markers containing the following data:
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# Identifying string ASCII "ICC_PROFILE\0" (12 bytes)
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# Marker sequence number 1, 2, etc (1 byte)
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# Number of markers Total of APP2's used (1 byte)
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# Profile data (remainder of APP2 data)
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# Decoders should use the marker sequence numbers to
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# reassemble the profile, rather than assuming that the APP2
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# markers appear in the correct sequence.
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self.icclist.append(s)
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elif marker == 0xFFEE and s[:5] == b"Adobe":
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self.info["adobe"] = i16(s, 5)
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# extract Adobe custom properties
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try:
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adobe_transform = i8(s[1])
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except:
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pass
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else:
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self.info["adobe_transform"] = adobe_transform
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def COM(self, marker):
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#
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# Comment marker. Store these in the APP dictionary.
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n = i16(self.fp.read(2))-2
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s = ImageFile._safe_read(self.fp, n)
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self.app["COM"] = s # compatibility
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self.applist.append(("COM", s))
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def SOF(self, marker):
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#
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# Start of frame marker. Defines the size and mode of the
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# image. JPEG is colour blind, so we use some simple
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# heuristics to map the number of layers to an appropriate
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# mode. Note that this could be made a bit brighter, by
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# looking for JFIF and Adobe APP markers.
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n = i16(self.fp.read(2))-2
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s = ImageFile._safe_read(self.fp, n)
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self.size = i16(s[3:]), i16(s[1:])
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self.bits = i8(s[0])
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if self.bits != 8:
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raise SyntaxError("cannot handle %d-bit layers" % self.bits)
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self.layers = i8(s[5])
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if self.layers == 1:
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self.mode = "L"
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elif self.layers == 3:
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self.mode = "RGB"
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elif self.layers == 4:
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self.mode = "CMYK"
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else:
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raise SyntaxError("cannot handle %d-layer images" % self.layers)
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if marker in [0xFFC2, 0xFFC6, 0xFFCA, 0xFFCE]:
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self.info["progressive"] = self.info["progression"] = 1
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if self.icclist:
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# fixup icc profile
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self.icclist.sort() # sort by sequence number
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if i8(self.icclist[0][13]) == len(self.icclist):
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profile = []
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for p in self.icclist:
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profile.append(p[14:])
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icc_profile = b"".join(profile)
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else:
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icc_profile = None # wrong number of fragments
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self.info["icc_profile"] = icc_profile
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self.icclist = None
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for i in range(6, len(s), 3):
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t = s[i:i+3]
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# 4-tuples: id, vsamp, hsamp, qtable
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self.layer.append((t[0], i8(t[1])//16, i8(t[1])&15, i8(t[2])))
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def DQT(self, marker):
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#
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# Define quantization table. Support baseline 8-bit tables
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# only. Note that there might be more than one table in
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# each marker.
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# FIXME: The quantization tables can be used to estimate the
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# compression quality.
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n = i16(self.fp.read(2))-2
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s = ImageFile._safe_read(self.fp, n)
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while len(s):
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if len(s) < 65:
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raise SyntaxError("bad quantization table marker")
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v = i8(s[0])
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if v//16 == 0:
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self.quantization[v&15] = array.array("b", s[1:65])
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s = s[65:]
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else:
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return # FIXME: add code to read 16-bit tables!
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# raise SyntaxError, "bad quantization table element size"
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#
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# JPEG marker table
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MARKER = {
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0xFFC0: ("SOF0", "Baseline DCT", SOF),
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0xFFC1: ("SOF1", "Extended Sequential DCT", SOF),
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0xFFC2: ("SOF2", "Progressive DCT", SOF),
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0xFFC3: ("SOF3", "Spatial lossless", SOF),
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0xFFC4: ("DHT", "Define Huffman table", Skip),
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0xFFC5: ("SOF5", "Differential sequential DCT", SOF),
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0xFFC6: ("SOF6", "Differential progressive DCT", SOF),
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0xFFC7: ("SOF7", "Differential spatial", SOF),
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0xFFC8: ("JPG", "Extension", None),
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0xFFC9: ("SOF9", "Extended sequential DCT (AC)", SOF),
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0xFFCA: ("SOF10", "Progressive DCT (AC)", SOF),
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0xFFCB: ("SOF11", "Spatial lossless DCT (AC)", SOF),
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0xFFCC: ("DAC", "Define arithmetic coding conditioning", Skip),
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0xFFCD: ("SOF13", "Differential sequential DCT (AC)", SOF),
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0xFFCE: ("SOF14", "Differential progressive DCT (AC)", SOF),
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0xFFCF: ("SOF15", "Differential spatial (AC)", SOF),
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0xFFD0: ("RST0", "Restart 0", None),
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0xFFD1: ("RST1", "Restart 1", None),
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0xFFD2: ("RST2", "Restart 2", None),
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0xFFD3: ("RST3", "Restart 3", None),
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0xFFD4: ("RST4", "Restart 4", None),
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0xFFD5: ("RST5", "Restart 5", None),
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0xFFD6: ("RST6", "Restart 6", None),
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0xFFD7: ("RST7", "Restart 7", None),
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0xFFD8: ("SOI", "Start of image", None),
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0xFFD9: ("EOI", "End of image", None),
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0xFFDA: ("SOS", "Start of scan", Skip),
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0xFFDB: ("DQT", "Define quantization table", DQT),
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0xFFDC: ("DNL", "Define number of lines", Skip),
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0xFFDD: ("DRI", "Define restart interval", Skip),
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0xFFDE: ("DHP", "Define hierarchical progression", SOF),
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0xFFDF: ("EXP", "Expand reference component", Skip),
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0xFFE0: ("APP0", "Application segment 0", APP),
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0xFFE1: ("APP1", "Application segment 1", APP),
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0xFFE2: ("APP2", "Application segment 2", APP),
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0xFFE3: ("APP3", "Application segment 3", APP),
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0xFFE4: ("APP4", "Application segment 4", APP),
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0xFFE5: ("APP5", "Application segment 5", APP),
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0xFFE6: ("APP6", "Application segment 6", APP),
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0xFFE7: ("APP7", "Application segment 7", APP),
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0xFFE8: ("APP8", "Application segment 8", APP),
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0xFFE9: ("APP9", "Application segment 9", APP),
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0xFFEA: ("APP10", "Application segment 10", APP),
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0xFFEB: ("APP11", "Application segment 11", APP),
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0xFFEC: ("APP12", "Application segment 12", APP),
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0xFFED: ("APP13", "Application segment 13", APP),
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0xFFEE: ("APP14", "Application segment 14", APP),
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0xFFEF: ("APP15", "Application segment 15", APP),
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0xFFF0: ("JPG0", "Extension 0", None),
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0xFFF1: ("JPG1", "Extension 1", None),
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0xFFF2: ("JPG2", "Extension 2", None),
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0xFFF3: ("JPG3", "Extension 3", None),
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0xFFF4: ("JPG4", "Extension 4", None),
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0xFFF5: ("JPG5", "Extension 5", None),
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0xFFF6: ("JPG6", "Extension 6", None),
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0xFFF7: ("JPG7", "Extension 7", None),
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0xFFF8: ("JPG8", "Extension 8", None),
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0xFFF9: ("JPG9", "Extension 9", None),
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0xFFFA: ("JPG10", "Extension 10", None),
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0xFFFB: ("JPG11", "Extension 11", None),
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0xFFFC: ("JPG12", "Extension 12", None),
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0xFFFD: ("JPG13", "Extension 13", None),
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0xFFFE: ("COM", "Comment", COM)
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}
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def _accept(prefix):
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return prefix[0:1] == b"\377"
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##
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# Image plugin for JPEG and JFIF images.
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class JpegImageFile(ImageFile.ImageFile):
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format = "JPEG"
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format_description = "JPEG (ISO 10918)"
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def _open(self):
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s = self.fp.read(1)
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if i8(s[0]) != 255:
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raise SyntaxError("not a JPEG file")
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# Create attributes
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self.bits = self.layers = 0
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# JPEG specifics (internal)
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self.layer = []
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self.huffman_dc = {}
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self.huffman_ac = {}
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self.quantization = {}
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self.app = {} # compatibility
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self.applist = []
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self.icclist = []
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while True:
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s = s + self.fp.read(1)
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i = i16(s)
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if i in MARKER:
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name, description, handler = MARKER[i]
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# print hex(i), name, description
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if handler is not None:
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handler(self, i)
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if i == 0xFFDA: # start of scan
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rawmode = self.mode
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if self.mode == "CMYK":
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rawmode = "CMYK;I" # assume adobe conventions
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self.tile = [("jpeg", (0,0) + self.size, 0, (rawmode, ""))]
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# self.__offset = self.fp.tell()
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break
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s = self.fp.read(1)
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elif i == 0 or i == 65535:
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# padded marker or junk; move on
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s = "\xff"
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else:
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raise SyntaxError("no marker found")
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def draft(self, mode, size):
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if len(self.tile) != 1:
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return
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d, e, o, a = self.tile[0]
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scale = 0
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if a[0] == "RGB" and mode in ["L", "YCbCr"]:
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self.mode = mode
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a = mode, ""
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if size:
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scale = max(self.size[0] // size[0], self.size[1] // size[1])
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for s in [8, 4, 2, 1]:
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if scale >= s:
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break
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e = e[0], e[1], (e[2]-e[0]+s-1)//s+e[0], (e[3]-e[1]+s-1)//s+e[1]
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self.size = ((self.size[0]+s-1)//s, (self.size[1]+s-1)//s)
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scale = s
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self.tile = [(d, e, o, a)]
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self.decoderconfig = (scale, 1)
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return self
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def load_djpeg(self):
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# ALTERNATIVE: handle JPEGs via the IJG command line utilities
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import tempfile, os
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file = tempfile.mktemp()
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os.system("djpeg %s >%s" % (self.filename, file))
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try:
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self.im = Image.core.open_ppm(file)
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finally:
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try: os.unlink(file)
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except: pass
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self.mode = self.im.mode
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self.size = self.im.size
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self.tile = []
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def _getexif(self):
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# Extract EXIF information. This method is highly experimental,
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# and is likely to be replaced with something better in a future
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# version.
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from PIL import TiffImagePlugin
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import io
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def fixup(value):
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if len(value) == 1:
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return value[0]
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return value
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# The EXIF record consists of a TIFF file embedded in a JPEG
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# application marker (!).
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try:
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data = self.info["exif"]
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except KeyError:
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return None
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file = io.BytesIO(data[6:])
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head = file.read(8)
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exif = {}
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# process dictionary
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info = TiffImagePlugin.ImageFileDirectory(head)
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info.load(file)
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for key, value in info.items():
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exif[key] = fixup(value)
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# get exif extension
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try:
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file.seek(exif[0x8769])
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except KeyError:
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pass
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else:
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info = TiffImagePlugin.ImageFileDirectory(head)
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info.load(file)
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for key, value in info.items():
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exif[key] = fixup(value)
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# get gpsinfo extension
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try:
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file.seek(exif[0x8825])
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except KeyError:
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pass
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else:
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info = TiffImagePlugin.ImageFileDirectory(head)
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info.load(file)
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exif[0x8825] = gps = {}
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for key, value in info.items():
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gps[key] = fixup(value)
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return exif
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# --------------------------------------------------------------------
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# stuff to save JPEG files
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RAWMODE = {
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"1": "L",
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"L": "L",
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"RGB": "RGB",
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"RGBA": "RGB",
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"RGBX": "RGB",
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"CMYK": "CMYK;I", # assume adobe conventions
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"YCbCr": "YCbCr",
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}
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zigzag_index = ( 0, 1, 5, 6, 14, 15, 27, 28,
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2, 4, 7, 13, 16, 26, 29, 42,
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3, 8, 12, 17, 25, 30, 41, 43,
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9, 11, 18, 24, 31, 40, 44, 53,
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10, 19, 23, 32, 39, 45, 52, 54,
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20, 22, 33, 38, 46, 51, 55, 60,
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21, 34, 37, 47, 50, 56, 59, 61,
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35, 36, 48, 49, 57, 58, 62, 63)
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samplings = {
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(1, 1, 1, 1, 1, 1): 0,
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(2, 1, 1, 1, 1, 1): 1,
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(2, 2, 1, 1, 1, 1): 2,
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}
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def convert_dict_qtables(qtables):
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qtables = [qtables[key] for key in xrange(len(qtables)) if qtables.has_key(key)]
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for idx, table in enumerate(qtables):
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qtables[idx] = [table[i] for i in zigzag_index]
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return qtables
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def get_sampling(im):
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sampling = im.layer[0][1:3] + im.layer[1][1:3] + im.layer[2][1:3]
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return samplings.get(sampling, -1)
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def _save(im, fp, filename):
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try:
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rawmode = RAWMODE[im.mode]
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except KeyError:
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raise IOError("cannot write mode %s as JPEG" % im.mode)
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info = im.encoderinfo
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dpi = info.get("dpi", (0, 0))
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quality = info.get("quality", 0)
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subsampling = info.get("subsampling", -1)
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qtables = info.get("qtables")
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if quality == "keep":
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quality = 0
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subsampling = "keep"
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qtables = "keep"
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elif quality in presets:
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preset = presets[quality]
|
|
quality = 0
|
|
subsampling = preset.get('subsampling', -1)
|
|
qtables = preset.get('quantization')
|
|
elif not isinstance(quality, int):
|
|
raise ValueError("Invalid quality setting")
|
|
else:
|
|
if subsampling in presets:
|
|
subsampling = presets[subsampling].get('subsampling', -1)
|
|
if qtables in presets:
|
|
qtables = presets[qtables].get('quantization')
|
|
|
|
if subsampling == "4:4:4":
|
|
subsampling = 0
|
|
elif subsampling == "4:2:2":
|
|
subsampling = 1
|
|
elif subsampling == "4:1:1":
|
|
subsampling = 2
|
|
elif subsampling == "keep":
|
|
if im.format != "JPEG":
|
|
raise ValueError("Cannot use 'keep' when original image is not a JPEG")
|
|
subsampling = get_sampling(im)
|
|
|
|
def validate_qtables(qtables):
|
|
if qtables is None:
|
|
return qtables
|
|
if isStringType(qtables):
|
|
try:
|
|
lines = [int(num) for line in qtables.splitlines()
|
|
for num in line.split('#', 1)[0].split()]
|
|
except ValueError:
|
|
raise ValueError("Invalid quantization table")
|
|
else:
|
|
qtables = [lines[s:s+64] for s in xrange(0, len(lines), 64)]
|
|
if isinstance(qtables, (tuple, list, dict)):
|
|
if isinstance(qtables, dict):
|
|
qtables = convert_dict_qtables(qtables)
|
|
elif isinstance(qtables, tuple):
|
|
qtables = list(qtables)
|
|
if not (0 < len(qtables) < 5):
|
|
raise ValueError("None or too many quantization tables")
|
|
for idx, table in enumerate(qtables):
|
|
try:
|
|
if len(table) != 64:
|
|
raise
|
|
table = array.array('b', table)
|
|
except TypeError:
|
|
raise ValueError("Invalid quantization table")
|
|
else:
|
|
qtables[idx] = list(table)
|
|
return qtables
|
|
|
|
if qtables == "keep":
|
|
if im.format != "JPEG":
|
|
raise ValueError("Cannot use 'keep' when original image is not a JPEG")
|
|
qtables = getattr(im, "quantization", None)
|
|
qtables = validate_qtables(qtables)
|
|
|
|
extra = b""
|
|
|
|
icc_profile = info.get("icc_profile")
|
|
if icc_profile:
|
|
ICC_OVERHEAD_LEN = 14
|
|
MAX_BYTES_IN_MARKER = 65533
|
|
MAX_DATA_BYTES_IN_MARKER = MAX_BYTES_IN_MARKER - ICC_OVERHEAD_LEN
|
|
markers = []
|
|
while icc_profile:
|
|
markers.append(icc_profile[:MAX_DATA_BYTES_IN_MARKER])
|
|
icc_profile = icc_profile[MAX_DATA_BYTES_IN_MARKER:]
|
|
i = 1
|
|
for marker in markers:
|
|
size = struct.pack(">H", 2 + ICC_OVERHEAD_LEN + len(marker))
|
|
extra = extra + (b"\xFF\xE2" + size + b"ICC_PROFILE\0" + o8(i) + o8(len(markers)) + marker)
|
|
i = i + 1
|
|
|
|
# get keyword arguments
|
|
im.encoderconfig = (
|
|
quality,
|
|
# "progressive" is the official name, but older documentation
|
|
# says "progression"
|
|
# FIXME: issue a warning if the wrong form is used (post-1.1.7)
|
|
"progressive" in info or "progression" in info,
|
|
info.get("smooth", 0),
|
|
"optimize" in info,
|
|
info.get("streamtype", 0),
|
|
dpi[0], dpi[1],
|
|
subsampling,
|
|
qtables,
|
|
extra,
|
|
info.get("exif", b"")
|
|
)
|
|
|
|
|
|
# if we optimize, libjpeg needs a buffer big enough to hold the whole image in a shot.
|
|
# Guessing on the size, at im.size bytes. (raw pizel size is channels*size, this
|
|
# is a value that's been used in a django patch.
|
|
# https://github.com/jdriscoll/django-imagekit/issues/50
|
|
bufsize=0
|
|
if "optimize" in info or "progressive" in info or "progression" in info:
|
|
bufsize = im.size[0]*im.size[1]
|
|
|
|
# The exif info needs to be written as one block, + APP1, + one spare byte.
|
|
# Ensure that our buffer is big enough
|
|
bufsize = max(ImageFile.MAXBLOCK, bufsize, len(info.get("exif",b"")) + 5 )
|
|
|
|
ImageFile._save(im, fp, [("jpeg", (0,0)+im.size, 0, rawmode)], bufsize)
|
|
|
|
def _save_cjpeg(im, fp, filename):
|
|
# ALTERNATIVE: handle JPEGs via the IJG command line utilities.
|
|
import os
|
|
file = im._dump()
|
|
os.system("cjpeg %s >%s" % (file, filename))
|
|
try: os.unlink(file)
|
|
except: pass
|
|
|
|
# -------------------------------------------------------------------q-
|
|
# Registry stuff
|
|
|
|
Image.register_open("JPEG", JpegImageFile, _accept)
|
|
Image.register_save("JPEG", _save)
|
|
|
|
Image.register_extension("JPEG", ".jfif")
|
|
Image.register_extension("JPEG", ".jpe")
|
|
Image.register_extension("JPEG", ".jpg")
|
|
Image.register_extension("JPEG", ".jpeg")
|
|
|
|
Image.register_mime("JPEG", "image/jpeg")
|