You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
378 lines
10 KiB
Python
378 lines
10 KiB
Python
#
|
|
# The Python Imaging Library.
|
|
# $Id$
|
|
#
|
|
# IFUNC IM file handling for PIL
|
|
#
|
|
# history:
|
|
# 1995-09-01 fl Created.
|
|
# 1997-01-03 fl Save palette images
|
|
# 1997-01-08 fl Added sequence support
|
|
# 1997-01-23 fl Added P and RGB save support
|
|
# 1997-05-31 fl Read floating point images
|
|
# 1997-06-22 fl Save floating point images
|
|
# 1997-08-27 fl Read and save 1-bit images
|
|
# 1998-06-25 fl Added support for RGB+LUT images
|
|
# 1998-07-02 fl Added support for YCC images
|
|
# 1998-07-15 fl Renamed offset attribute to avoid name clash
|
|
# 1998-12-29 fl Added I;16 support
|
|
# 2001-02-17 fl Use 're' instead of 'regex' (Python 2.1) (0.7)
|
|
# 2003-09-26 fl Added LA/PA support
|
|
#
|
|
# Copyright (c) 1997-2003 by Secret Labs AB.
|
|
# Copyright (c) 1995-2001 by Fredrik Lundh.
|
|
#
|
|
# See the README file for information on usage and redistribution.
|
|
#
|
|
|
|
|
|
import os
|
|
import re
|
|
|
|
from . import Image, ImageFile, ImagePalette
|
|
from ._binary import i8
|
|
|
|
# --------------------------------------------------------------------
|
|
# Standard tags
|
|
|
|
COMMENT = "Comment"
|
|
DATE = "Date"
|
|
EQUIPMENT = "Digitalization equipment"
|
|
FRAMES = "File size (no of images)"
|
|
LUT = "Lut"
|
|
NAME = "Name"
|
|
SCALE = "Scale (x,y)"
|
|
SIZE = "Image size (x*y)"
|
|
MODE = "Image type"
|
|
|
|
TAGS = {
|
|
COMMENT: 0,
|
|
DATE: 0,
|
|
EQUIPMENT: 0,
|
|
FRAMES: 0,
|
|
LUT: 0,
|
|
NAME: 0,
|
|
SCALE: 0,
|
|
SIZE: 0,
|
|
MODE: 0,
|
|
}
|
|
|
|
OPEN = {
|
|
# ifunc93/p3cfunc formats
|
|
"0 1 image": ("1", "1"),
|
|
"L 1 image": ("1", "1"),
|
|
"Greyscale image": ("L", "L"),
|
|
"Grayscale image": ("L", "L"),
|
|
"RGB image": ("RGB", "RGB;L"),
|
|
"RLB image": ("RGB", "RLB"),
|
|
"RYB image": ("RGB", "RLB"),
|
|
"B1 image": ("1", "1"),
|
|
"B2 image": ("P", "P;2"),
|
|
"B4 image": ("P", "P;4"),
|
|
"X 24 image": ("RGB", "RGB"),
|
|
"L 32 S image": ("I", "I;32"),
|
|
"L 32 F image": ("F", "F;32"),
|
|
# old p3cfunc formats
|
|
"RGB3 image": ("RGB", "RGB;T"),
|
|
"RYB3 image": ("RGB", "RYB;T"),
|
|
# extensions
|
|
"LA image": ("LA", "LA;L"),
|
|
"PA image": ("LA", "PA;L"),
|
|
"RGBA image": ("RGBA", "RGBA;L"),
|
|
"RGBX image": ("RGBX", "RGBX;L"),
|
|
"CMYK image": ("CMYK", "CMYK;L"),
|
|
"YCC image": ("YCbCr", "YCbCr;L"),
|
|
}
|
|
|
|
# ifunc95 extensions
|
|
for i in ["8", "8S", "16", "16S", "32", "32F"]:
|
|
OPEN["L %s image" % i] = ("F", "F;%s" % i)
|
|
OPEN["L*%s image" % i] = ("F", "F;%s" % i)
|
|
for i in ["16", "16L", "16B"]:
|
|
OPEN["L %s image" % i] = ("I;%s" % i, "I;%s" % i)
|
|
OPEN["L*%s image" % i] = ("I;%s" % i, "I;%s" % i)
|
|
for i in ["32S"]:
|
|
OPEN["L %s image" % i] = ("I", "I;%s" % i)
|
|
OPEN["L*%s image" % i] = ("I", "I;%s" % i)
|
|
for i in range(2, 33):
|
|
OPEN["L*%s image" % i] = ("F", "F;%s" % i)
|
|
|
|
|
|
# --------------------------------------------------------------------
|
|
# Read IM directory
|
|
|
|
split = re.compile(br"^([A-Za-z][^:]*):[ \t]*(.*)[ \t]*$")
|
|
|
|
|
|
def number(s):
|
|
try:
|
|
return int(s)
|
|
except ValueError:
|
|
return float(s)
|
|
|
|
|
|
##
|
|
# Image plugin for the IFUNC IM file format.
|
|
|
|
|
|
class ImImageFile(ImageFile.ImageFile):
|
|
|
|
format = "IM"
|
|
format_description = "IFUNC Image Memory"
|
|
_close_exclusive_fp_after_loading = False
|
|
|
|
def _open(self):
|
|
|
|
# Quick rejection: if there's not an LF among the first
|
|
# 100 bytes, this is (probably) not a text header.
|
|
|
|
if b"\n" not in self.fp.read(100):
|
|
raise SyntaxError("not an IM file")
|
|
self.fp.seek(0)
|
|
|
|
n = 0
|
|
|
|
# Default values
|
|
self.info[MODE] = "L"
|
|
self.info[SIZE] = (512, 512)
|
|
self.info[FRAMES] = 1
|
|
|
|
self.rawmode = "L"
|
|
|
|
while True:
|
|
|
|
s = self.fp.read(1)
|
|
|
|
# Some versions of IFUNC uses \n\r instead of \r\n...
|
|
if s == b"\r":
|
|
continue
|
|
|
|
if not s or s == b"\0" or s == b"\x1A":
|
|
break
|
|
|
|
# FIXME: this may read whole file if not a text file
|
|
s = s + self.fp.readline()
|
|
|
|
if len(s) > 100:
|
|
raise SyntaxError("not an IM file")
|
|
|
|
if s[-2:] == b"\r\n":
|
|
s = s[:-2]
|
|
elif s[-1:] == b"\n":
|
|
s = s[:-1]
|
|
|
|
try:
|
|
m = split.match(s)
|
|
except re.error:
|
|
raise SyntaxError("not an IM file")
|
|
|
|
if m:
|
|
|
|
k, v = m.group(1, 2)
|
|
|
|
# Don't know if this is the correct encoding,
|
|
# but a decent guess (I guess)
|
|
k = k.decode("latin-1", "replace")
|
|
v = v.decode("latin-1", "replace")
|
|
|
|
# Convert value as appropriate
|
|
if k in [FRAMES, SCALE, SIZE]:
|
|
v = v.replace("*", ",")
|
|
v = tuple(map(number, v.split(",")))
|
|
if len(v) == 1:
|
|
v = v[0]
|
|
elif k == MODE and v in OPEN:
|
|
v, self.rawmode = OPEN[v]
|
|
|
|
# Add to dictionary. Note that COMMENT tags are
|
|
# combined into a list of strings.
|
|
if k == COMMENT:
|
|
if k in self.info:
|
|
self.info[k].append(v)
|
|
else:
|
|
self.info[k] = [v]
|
|
else:
|
|
self.info[k] = v
|
|
|
|
if k in TAGS:
|
|
n += 1
|
|
|
|
else:
|
|
|
|
raise SyntaxError(
|
|
"Syntax error in IM header: " + s.decode("ascii", "replace")
|
|
)
|
|
|
|
if not n:
|
|
raise SyntaxError("Not an IM file")
|
|
|
|
# Basic attributes
|
|
self._size = self.info[SIZE]
|
|
self.mode = self.info[MODE]
|
|
|
|
# Skip forward to start of image data
|
|
while s and s[0:1] != b"\x1A":
|
|
s = self.fp.read(1)
|
|
if not s:
|
|
raise SyntaxError("File truncated")
|
|
|
|
if LUT in self.info:
|
|
# convert lookup table to palette or lut attribute
|
|
palette = self.fp.read(768)
|
|
greyscale = 1 # greyscale palette
|
|
linear = 1 # linear greyscale palette
|
|
for i in range(256):
|
|
if palette[i] == palette[i + 256] == palette[i + 512]:
|
|
if i8(palette[i]) != i:
|
|
linear = 0
|
|
else:
|
|
greyscale = 0
|
|
if self.mode in ["L", "LA", "P", "PA"]:
|
|
if greyscale:
|
|
if not linear:
|
|
self.lut = [i8(c) for c in palette[:256]]
|
|
else:
|
|
if self.mode in ["L", "P"]:
|
|
self.mode = self.rawmode = "P"
|
|
elif self.mode in ["LA", "PA"]:
|
|
self.mode = "PA"
|
|
self.rawmode = "PA;L"
|
|
self.palette = ImagePalette.raw("RGB;L", palette)
|
|
elif self.mode == "RGB":
|
|
if not greyscale or not linear:
|
|
self.lut = [i8(c) for c in palette]
|
|
|
|
self.frame = 0
|
|
|
|
self.__offset = offs = self.fp.tell()
|
|
|
|
self.__fp = self.fp # FIXME: hack
|
|
|
|
if self.rawmode[:2] == "F;":
|
|
|
|
# ifunc95 formats
|
|
try:
|
|
# use bit decoder (if necessary)
|
|
bits = int(self.rawmode[2:])
|
|
if bits not in [8, 16, 32]:
|
|
self.tile = [("bit", (0, 0) + self.size, offs, (bits, 8, 3, 0, -1))]
|
|
return
|
|
except ValueError:
|
|
pass
|
|
|
|
if self.rawmode in ["RGB;T", "RYB;T"]:
|
|
# Old LabEye/3PC files. Would be very surprised if anyone
|
|
# ever stumbled upon such a file ;-)
|
|
size = self.size[0] * self.size[1]
|
|
self.tile = [
|
|
("raw", (0, 0) + self.size, offs, ("G", 0, -1)),
|
|
("raw", (0, 0) + self.size, offs + size, ("R", 0, -1)),
|
|
("raw", (0, 0) + self.size, offs + 2 * size, ("B", 0, -1)),
|
|
]
|
|
else:
|
|
# LabEye/IFUNC files
|
|
self.tile = [("raw", (0, 0) + self.size, offs, (self.rawmode, 0, -1))]
|
|
|
|
@property
|
|
def n_frames(self):
|
|
return self.info[FRAMES]
|
|
|
|
@property
|
|
def is_animated(self):
|
|
return self.info[FRAMES] > 1
|
|
|
|
def seek(self, frame):
|
|
if not self._seek_check(frame):
|
|
return
|
|
|
|
self.frame = frame
|
|
|
|
if self.mode == "1":
|
|
bits = 1
|
|
else:
|
|
bits = 8 * len(self.mode)
|
|
|
|
size = ((self.size[0] * bits + 7) // 8) * self.size[1]
|
|
offs = self.__offset + frame * size
|
|
|
|
self.fp = self.__fp
|
|
|
|
self.tile = [("raw", (0, 0) + self.size, offs, (self.rawmode, 0, -1))]
|
|
|
|
def tell(self):
|
|
return self.frame
|
|
|
|
def _close__fp(self):
|
|
try:
|
|
if self.__fp != self.fp:
|
|
self.__fp.close()
|
|
except AttributeError:
|
|
pass
|
|
finally:
|
|
self.__fp = None
|
|
|
|
|
|
#
|
|
# --------------------------------------------------------------------
|
|
# Save IM files
|
|
|
|
|
|
SAVE = {
|
|
# mode: (im type, raw mode)
|
|
"1": ("0 1", "1"),
|
|
"L": ("Greyscale", "L"),
|
|
"LA": ("LA", "LA;L"),
|
|
"P": ("Greyscale", "P"),
|
|
"PA": ("LA", "PA;L"),
|
|
"I": ("L 32S", "I;32S"),
|
|
"I;16": ("L 16", "I;16"),
|
|
"I;16L": ("L 16L", "I;16L"),
|
|
"I;16B": ("L 16B", "I;16B"),
|
|
"F": ("L 32F", "F;32F"),
|
|
"RGB": ("RGB", "RGB;L"),
|
|
"RGBA": ("RGBA", "RGBA;L"),
|
|
"RGBX": ("RGBX", "RGBX;L"),
|
|
"CMYK": ("CMYK", "CMYK;L"),
|
|
"YCbCr": ("YCC", "YCbCr;L"),
|
|
}
|
|
|
|
|
|
def _save(im, fp, filename):
|
|
|
|
try:
|
|
image_type, rawmode = SAVE[im.mode]
|
|
except KeyError:
|
|
raise ValueError("Cannot save %s images as IM" % im.mode)
|
|
|
|
frames = im.encoderinfo.get("frames", 1)
|
|
|
|
fp.write(("Image type: %s image\r\n" % image_type).encode("ascii"))
|
|
if filename:
|
|
# Each line must be 100 characters or less,
|
|
# or: SyntaxError("not an IM file")
|
|
# 8 characters are used for "Name: " and "\r\n"
|
|
# Keep just the filename, ditch the potentially overlong path
|
|
name, ext = os.path.splitext(os.path.basename(filename))
|
|
name = "".join([name[: 92 - len(ext)], ext])
|
|
|
|
fp.write(("Name: %s\r\n" % name).encode("ascii"))
|
|
fp.write(("Image size (x*y): %d*%d\r\n" % im.size).encode("ascii"))
|
|
fp.write(("File size (no of images): %d\r\n" % frames).encode("ascii"))
|
|
if im.mode in ["P", "PA"]:
|
|
fp.write(b"Lut: 1\r\n")
|
|
fp.write(b"\000" * (511 - fp.tell()) + b"\032")
|
|
if im.mode in ["P", "PA"]:
|
|
fp.write(im.im.getpalette("RGB", "RGB;L")) # 768 bytes
|
|
ImageFile._save(im, fp, [("raw", (0, 0) + im.size, 0, (rawmode, 0, -1))])
|
|
|
|
|
|
#
|
|
# --------------------------------------------------------------------
|
|
# Registry
|
|
|
|
|
|
Image.register_open(ImImageFile.format, ImImageFile)
|
|
Image.register_save(ImImageFile.format, _save)
|
|
|
|
Image.register_extension(ImImageFile.format, ".im")
|