375 lines
11 KiB
Python
375 lines
11 KiB
Python
#
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# The Python Imaging Library.
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# $Id$
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#
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# IFUNC IM file handling for PIL
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#
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# history:
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# 1995-09-01 fl Created.
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# 1997-01-03 fl Save palette images
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# 1997-01-08 fl Added sequence support
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# 1997-01-23 fl Added P and RGB save support
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# 1997-05-31 fl Read floating point images
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# 1997-06-22 fl Save floating point images
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# 1997-08-27 fl Read and save 1-bit images
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# 1998-06-25 fl Added support for RGB+LUT images
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# 1998-07-02 fl Added support for YCC images
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# 1998-07-15 fl Renamed offset attribute to avoid name clash
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# 1998-12-29 fl Added I;16 support
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# 2001-02-17 fl Use 're' instead of 'regex' (Python 2.1) (0.7)
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# 2003-09-26 fl Added LA/PA support
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#
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# Copyright (c) 1997-2003 by Secret Labs AB.
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# Copyright (c) 1995-2001 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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from __future__ import annotations
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import os
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import re
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from typing import IO, Any
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from . import Image, ImageFile, ImagePalette
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# --------------------------------------------------------------------
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# Standard tags
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COMMENT = "Comment"
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DATE = "Date"
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EQUIPMENT = "Digitalization equipment"
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FRAMES = "File size (no of images)"
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LUT = "Lut"
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NAME = "Name"
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SCALE = "Scale (x,y)"
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SIZE = "Image size (x*y)"
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MODE = "Image type"
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TAGS = {
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COMMENT: 0,
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DATE: 0,
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EQUIPMENT: 0,
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FRAMES: 0,
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LUT: 0,
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NAME: 0,
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SCALE: 0,
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SIZE: 0,
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MODE: 0,
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}
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OPEN = {
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# ifunc93/p3cfunc formats
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"0 1 image": ("1", "1"),
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"L 1 image": ("1", "1"),
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"Greyscale image": ("L", "L"),
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"Grayscale image": ("L", "L"),
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"RGB image": ("RGB", "RGB;L"),
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"RLB image": ("RGB", "RLB"),
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"RYB image": ("RGB", "RLB"),
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"B1 image": ("1", "1"),
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"B2 image": ("P", "P;2"),
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"B4 image": ("P", "P;4"),
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"X 24 image": ("RGB", "RGB"),
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"L 32 S image": ("I", "I;32"),
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"L 32 F image": ("F", "F;32"),
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# old p3cfunc formats
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"RGB3 image": ("RGB", "RGB;T"),
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"RYB3 image": ("RGB", "RYB;T"),
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# extensions
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"LA image": ("LA", "LA;L"),
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"PA image": ("LA", "PA;L"),
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"RGBA image": ("RGBA", "RGBA;L"),
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"RGBX image": ("RGB", "RGBX;L"),
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"CMYK image": ("CMYK", "CMYK;L"),
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"YCC image": ("YCbCr", "YCbCr;L"),
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}
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# ifunc95 extensions
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for i in ["8", "8S", "16", "16S", "32", "32F"]:
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OPEN[f"L {i} image"] = ("F", f"F;{i}")
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OPEN[f"L*{i} image"] = ("F", f"F;{i}")
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for i in ["16", "16L", "16B"]:
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OPEN[f"L {i} image"] = (f"I;{i}", f"I;{i}")
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OPEN[f"L*{i} image"] = (f"I;{i}", f"I;{i}")
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for i in ["32S"]:
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OPEN[f"L {i} image"] = ("I", f"I;{i}")
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OPEN[f"L*{i} image"] = ("I", f"I;{i}")
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for j in range(2, 33):
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OPEN[f"L*{j} image"] = ("F", f"F;{j}")
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# --------------------------------------------------------------------
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# Read IM directory
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split = re.compile(rb"^([A-Za-z][^:]*):[ \t]*(.*)[ \t]*$")
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def number(s: Any) -> float:
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try:
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return int(s)
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except ValueError:
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return float(s)
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##
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# Image plugin for the IFUNC IM file format.
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class ImImageFile(ImageFile.ImageFile):
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format = "IM"
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format_description = "IFUNC Image Memory"
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_close_exclusive_fp_after_loading = False
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def _open(self) -> None:
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# Quick rejection: if there's not an LF among the first
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# 100 bytes, this is (probably) not a text header.
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if b"\n" not in self.fp.read(100):
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msg = "not an IM file"
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raise SyntaxError(msg)
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self.fp.seek(0)
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n = 0
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# Default values
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self.info[MODE] = "L"
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self.info[SIZE] = (512, 512)
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self.info[FRAMES] = 1
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self.rawmode = "L"
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while True:
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s = self.fp.read(1)
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# Some versions of IFUNC uses \n\r instead of \r\n...
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if s == b"\r":
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continue
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if not s or s == b"\0" or s == b"\x1A":
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break
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# FIXME: this may read whole file if not a text file
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s = s + self.fp.readline()
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if len(s) > 100:
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msg = "not an IM file"
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raise SyntaxError(msg)
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if s[-2:] == b"\r\n":
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s = s[:-2]
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elif s[-1:] == b"\n":
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s = s[:-1]
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try:
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m = split.match(s)
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except re.error as e:
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msg = "not an IM file"
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raise SyntaxError(msg) from e
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if m:
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k, v = m.group(1, 2)
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# Don't know if this is the correct encoding,
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# but a decent guess (I guess)
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k = k.decode("latin-1", "replace")
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v = v.decode("latin-1", "replace")
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# Convert value as appropriate
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if k in [FRAMES, SCALE, SIZE]:
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v = v.replace("*", ",")
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v = tuple(map(number, v.split(",")))
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if len(v) == 1:
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v = v[0]
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elif k == MODE and v in OPEN:
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v, self.rawmode = OPEN[v]
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# Add to dictionary. Note that COMMENT tags are
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# combined into a list of strings.
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if k == COMMENT:
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if k in self.info:
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self.info[k].append(v)
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else:
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self.info[k] = [v]
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else:
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self.info[k] = v
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if k in TAGS:
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n += 1
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else:
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msg = f"Syntax error in IM header: {s.decode('ascii', 'replace')}"
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raise SyntaxError(msg)
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if not n:
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msg = "Not an IM file"
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raise SyntaxError(msg)
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# Basic attributes
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self._size = self.info[SIZE]
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self._mode = self.info[MODE]
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# Skip forward to start of image data
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while s and s[:1] != b"\x1A":
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s = self.fp.read(1)
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if not s:
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msg = "File truncated"
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raise SyntaxError(msg)
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if LUT in self.info:
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# convert lookup table to palette or lut attribute
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palette = self.fp.read(768)
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greyscale = 1 # greyscale palette
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linear = 1 # linear greyscale palette
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for i in range(256):
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if palette[i] == palette[i + 256] == palette[i + 512]:
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if palette[i] != i:
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linear = 0
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else:
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greyscale = 0
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if self.mode in ["L", "LA", "P", "PA"]:
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if greyscale:
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if not linear:
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self.lut = list(palette[:256])
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else:
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if self.mode in ["L", "P"]:
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self._mode = self.rawmode = "P"
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elif self.mode in ["LA", "PA"]:
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self._mode = "PA"
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self.rawmode = "PA;L"
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self.palette = ImagePalette.raw("RGB;L", palette)
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elif self.mode == "RGB":
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if not greyscale or not linear:
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self.lut = list(palette)
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self.frame = 0
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self.__offset = offs = self.fp.tell()
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self._fp = self.fp # FIXME: hack
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if self.rawmode[:2] == "F;":
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# ifunc95 formats
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try:
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# use bit decoder (if necessary)
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bits = int(self.rawmode[2:])
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if bits not in [8, 16, 32]:
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self.tile = [("bit", (0, 0) + self.size, offs, (bits, 8, 3, 0, -1))]
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return
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except ValueError:
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pass
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if self.rawmode in ["RGB;T", "RYB;T"]:
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# Old LabEye/3PC files. Would be very surprised if anyone
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# ever stumbled upon such a file ;-)
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size = self.size[0] * self.size[1]
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self.tile = [
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("raw", (0, 0) + self.size, offs, ("G", 0, -1)),
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("raw", (0, 0) + self.size, offs + size, ("R", 0, -1)),
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("raw", (0, 0) + self.size, offs + 2 * size, ("B", 0, -1)),
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]
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else:
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# LabEye/IFUNC files
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self.tile = [("raw", (0, 0) + self.size, offs, (self.rawmode, 0, -1))]
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@property
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def n_frames(self) -> int:
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return self.info[FRAMES]
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@property
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def is_animated(self) -> bool:
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return self.info[FRAMES] > 1
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def seek(self, frame: int) -> None:
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if not self._seek_check(frame):
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return
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self.frame = frame
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if self.mode == "1":
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bits = 1
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else:
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bits = 8 * len(self.mode)
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size = ((self.size[0] * bits + 7) // 8) * self.size[1]
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offs = self.__offset + frame * size
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self.fp = self._fp
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self.tile = [("raw", (0, 0) + self.size, offs, (self.rawmode, 0, -1))]
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def tell(self) -> int:
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return self.frame
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#
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# --------------------------------------------------------------------
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# Save IM files
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SAVE = {
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# mode: (im type, raw mode)
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"1": ("0 1", "1"),
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"L": ("Greyscale", "L"),
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"LA": ("LA", "LA;L"),
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"P": ("Greyscale", "P"),
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"PA": ("LA", "PA;L"),
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"I": ("L 32S", "I;32S"),
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"I;16": ("L 16", "I;16"),
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"I;16L": ("L 16L", "I;16L"),
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"I;16B": ("L 16B", "I;16B"),
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"F": ("L 32F", "F;32F"),
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"RGB": ("RGB", "RGB;L"),
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"RGBA": ("RGBA", "RGBA;L"),
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"RGBX": ("RGBX", "RGBX;L"),
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"CMYK": ("CMYK", "CMYK;L"),
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"YCbCr": ("YCC", "YCbCr;L"),
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}
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def _save(im: Image.Image, fp: IO[bytes], filename: str | bytes) -> None:
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try:
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image_type, rawmode = SAVE[im.mode]
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except KeyError as e:
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msg = f"Cannot save {im.mode} images as IM"
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raise ValueError(msg) from e
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frames = im.encoderinfo.get("frames", 1)
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fp.write(f"Image type: {image_type} image\r\n".encode("ascii"))
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if filename:
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# Each line must be 100 characters or less,
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# or: SyntaxError("not an IM file")
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# 8 characters are used for "Name: " and "\r\n"
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# Keep just the filename, ditch the potentially overlong path
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if isinstance(filename, bytes):
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filename = filename.decode("ascii")
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name, ext = os.path.splitext(os.path.basename(filename))
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name = "".join([name[: 92 - len(ext)], ext])
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fp.write(f"Name: {name}\r\n".encode("ascii"))
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fp.write(("Image size (x*y): %d*%d\r\n" % im.size).encode("ascii"))
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fp.write(f"File size (no of images): {frames}\r\n".encode("ascii"))
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if im.mode in ["P", "PA"]:
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fp.write(b"Lut: 1\r\n")
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fp.write(b"\000" * (511 - fp.tell()) + b"\032")
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if im.mode in ["P", "PA"]:
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im_palette = im.im.getpalette("RGB", "RGB;L")
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colors = len(im_palette) // 3
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palette = b""
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for i in range(3):
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palette += im_palette[colors * i : colors * (i + 1)]
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palette += b"\x00" * (256 - colors)
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fp.write(palette) # 768 bytes
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ImageFile._save(im, fp, [("raw", (0, 0) + im.size, 0, (rawmode, 0, -1))])
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#
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# --------------------------------------------------------------------
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# Registry
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Image.register_open(ImImageFile.format, ImImageFile)
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Image.register_save(ImImageFile.format, _save)
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Image.register_extension(ImImageFile.format, ".im")
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