mirror of
https://github.com/python-pillow/Pillow.git
synced 2025-10-31 16:07:30 +03:00
390 lines
11 KiB
Python
390 lines
11 KiB
Python
#
|
|
# The Python Imaging Library.
|
|
# $Id$
|
|
#
|
|
# EPS file handling
|
|
#
|
|
# History:
|
|
# 1995-09-01 fl Created (0.1)
|
|
# 1996-05-18 fl Don't choke on "atend" fields, Ghostscript interface (0.2)
|
|
# 1996-08-22 fl Don't choke on floating point BoundingBox values
|
|
# 1996-08-23 fl Handle files from Macintosh (0.3)
|
|
# 2001-02-17 fl Use 're' instead of 'regex' (Python 2.1) (0.4)
|
|
# 2003-09-07 fl Check gs.close status (from Federico Di Gregorio) (0.5)
|
|
#
|
|
# Copyright (c) 1997-2003 by Secret Labs AB.
|
|
# Copyright (c) 1995-2003 by Fredrik Lundh
|
|
#
|
|
# See the README file for information on usage and redistribution.
|
|
#
|
|
|
|
__version__ = "0.5"
|
|
|
|
import re
|
|
import io
|
|
from PIL import Image, ImageFile, _binary
|
|
|
|
#
|
|
# --------------------------------------------------------------------
|
|
|
|
i32 = _binary.i32le
|
|
o32 = _binary.o32le
|
|
|
|
split = re.compile(r"^%%([^:]*):[ \t]*(.*)[ \t]*$")
|
|
field = re.compile(r"^%[%!\w]([^:]*)[ \t]*$")
|
|
|
|
gs_windows_binary = None
|
|
import sys
|
|
if sys.platform.startswith('win'):
|
|
import shutil
|
|
if hasattr(shutil, 'which'):
|
|
which = shutil.which
|
|
else:
|
|
# Python < 3.3
|
|
import distutils.spawn
|
|
which = distutils.spawn.find_executable
|
|
for binary in ('gswin32c', 'gswin64c', 'gs'):
|
|
if which(binary) is not None:
|
|
gs_windows_binary = binary
|
|
break
|
|
else:
|
|
gs_windows_binary = False
|
|
|
|
def Ghostscript(tile, size, fp):
|
|
"""Render an image using Ghostscript"""
|
|
|
|
# Unpack decoder tile
|
|
decoder, tile, offset, data = tile[0]
|
|
length, bbox = data
|
|
|
|
import tempfile, os
|
|
|
|
file = tempfile.mktemp()
|
|
|
|
# Build ghostscript command
|
|
command = ["gs",
|
|
"-q", # quite mode
|
|
"-g%dx%d" % size, # set output geometry (pixels)
|
|
"-dNOPAUSE -dSAFER", # don't pause between pages, safe mode
|
|
"-sDEVICE=ppmraw", # ppm driver
|
|
"-sOutputFile=%s" % file,# output file
|
|
"- >/dev/null 2>/dev/null"]
|
|
|
|
if gs_windows_binary is not None:
|
|
if gs_windows_binary is False:
|
|
raise WindowsError('Unable to locate Ghostscript on paths')
|
|
command[0] = gs_windows_binary
|
|
command[-1] = '- >nul 2>nul'
|
|
|
|
command = " ".join(command)
|
|
|
|
# push data through ghostscript
|
|
try:
|
|
gs = os.popen(command, "w")
|
|
# adjust for image origin
|
|
if bbox[0] != 0 or bbox[1] != 0:
|
|
gs.write("%d %d translate\n" % (-bbox[0], -bbox[1]))
|
|
fp.seek(offset)
|
|
while length > 0:
|
|
s = fp.read(8192)
|
|
if not s:
|
|
break
|
|
length = length - len(s)
|
|
gs.write(s)
|
|
status = gs.close()
|
|
if status:
|
|
raise IOError("gs failed (status %d)" % status)
|
|
im = Image.core.open_ppm(file)
|
|
finally:
|
|
try: os.unlink(file)
|
|
except: pass
|
|
|
|
return im
|
|
|
|
|
|
class PSFile:
|
|
"""Wrapper that treats either CR or LF as end of line."""
|
|
def __init__(self, fp):
|
|
self.fp = fp
|
|
self.char = None
|
|
def __getattr__(self, id):
|
|
v = getattr(self.fp, id)
|
|
setattr(self, id, v)
|
|
return v
|
|
def seek(self, offset, whence=0):
|
|
self.char = None
|
|
self.fp.seek(offset, whence)
|
|
def read(self, count):
|
|
return self.fp.read(count).decode('latin-1')
|
|
def tell(self):
|
|
pos = self.fp.tell()
|
|
if self.char:
|
|
pos = pos - 1
|
|
return pos
|
|
def readline(self):
|
|
s = b""
|
|
if self.char:
|
|
c = self.char
|
|
self.char = None
|
|
else:
|
|
c = self.fp.read(1)
|
|
while c not in b"\r\n":
|
|
s = s + c
|
|
c = self.fp.read(1)
|
|
if c == b"\r":
|
|
self.char = self.fp.read(1)
|
|
if self.char == b"\n":
|
|
self.char = None
|
|
return s.decode('latin-1') + "\n"
|
|
|
|
|
|
def _accept(prefix):
|
|
return prefix[:4] == b"%!PS" or i32(prefix) == 0xC6D3D0C5
|
|
|
|
##
|
|
# Image plugin for Encapsulated Postscript. This plugin supports only
|
|
# a few variants of this format.
|
|
|
|
class EpsImageFile(ImageFile.ImageFile):
|
|
"""EPS File Parser for the Python Imaging Library"""
|
|
|
|
format = "EPS"
|
|
format_description = "Encapsulated Postscript"
|
|
|
|
def _open(self):
|
|
|
|
# FIXME: should check the first 512 bytes to see if this
|
|
# really is necessary (platform-dependent, though...)
|
|
|
|
fp = PSFile(self.fp)
|
|
|
|
# HEAD
|
|
s = fp.read(512)
|
|
if s[:4] == "%!PS":
|
|
offset = 0
|
|
fp.seek(0, 2)
|
|
length = fp.tell()
|
|
elif i32(s) == 0xC6D3D0C5:
|
|
offset = i32(s[4:])
|
|
length = i32(s[8:])
|
|
fp.seek(offset)
|
|
else:
|
|
raise SyntaxError("not an EPS file")
|
|
|
|
fp.seek(offset)
|
|
|
|
box = None
|
|
|
|
self.mode = "RGB"
|
|
self.size = 1, 1 # FIXME: huh?
|
|
|
|
#
|
|
# Load EPS header
|
|
|
|
s = fp.readline()
|
|
|
|
while s:
|
|
|
|
if len(s) > 255:
|
|
raise SyntaxError("not an EPS file")
|
|
|
|
if s[-2:] == '\r\n':
|
|
s = s[:-2]
|
|
elif s[-1:] == '\n':
|
|
s = s[:-1]
|
|
|
|
try:
|
|
m = split.match(s)
|
|
except re.error as v:
|
|
raise SyntaxError("not an EPS file")
|
|
|
|
if m:
|
|
k, v = m.group(1, 2)
|
|
self.info[k] = v
|
|
if k == "BoundingBox":
|
|
try:
|
|
# Note: The DSC spec says that BoundingBox
|
|
# fields should be integers, but some drivers
|
|
# put floating point values there anyway.
|
|
box = [int(float(s)) for s in v.split()]
|
|
self.size = box[2] - box[0], box[3] - box[1]
|
|
self.tile = [("eps", (0,0) + self.size, offset,
|
|
(length, box))]
|
|
except:
|
|
pass
|
|
|
|
else:
|
|
|
|
m = field.match(s)
|
|
|
|
if m:
|
|
k = m.group(1)
|
|
|
|
if k == "EndComments":
|
|
break
|
|
if k[:8] == "PS-Adobe":
|
|
self.info[k[:8]] = k[9:]
|
|
else:
|
|
self.info[k] = ""
|
|
elif s[0:1] == '%':
|
|
# handle non-DSC Postscript comments that some
|
|
# tools mistakenly put in the Comments section
|
|
pass
|
|
else:
|
|
raise IOError("bad EPS header")
|
|
|
|
s = fp.readline()
|
|
|
|
if s[:1] != "%":
|
|
break
|
|
|
|
|
|
#
|
|
# Scan for an "ImageData" descriptor
|
|
|
|
while s[0] == "%":
|
|
|
|
if len(s) > 255:
|
|
raise SyntaxError("not an EPS file")
|
|
|
|
if s[-2:] == '\r\n':
|
|
s = s[:-2]
|
|
elif s[-1:] == '\n':
|
|
s = s[:-1]
|
|
|
|
if s[:11] == "%ImageData:":
|
|
|
|
[x, y, bi, mo, z3, z4, en, id] =\
|
|
s[11:].split(None, 7)
|
|
|
|
x = int(x); y = int(y)
|
|
|
|
bi = int(bi)
|
|
mo = int(mo)
|
|
|
|
en = int(en)
|
|
|
|
if en == 1:
|
|
decoder = "eps_binary"
|
|
elif en == 2:
|
|
decoder = "eps_hex"
|
|
else:
|
|
break
|
|
if bi != 8:
|
|
break
|
|
if mo == 1:
|
|
self.mode = "L"
|
|
elif mo == 2:
|
|
self.mode = "LAB"
|
|
elif mo == 3:
|
|
self.mode = "RGB"
|
|
else:
|
|
break
|
|
|
|
if id[:1] == id[-1:] == '"':
|
|
id = id[1:-1]
|
|
|
|
# Scan forward to the actual image data
|
|
while True:
|
|
s = fp.readline()
|
|
if not s:
|
|
break
|
|
if s[:len(id)] == id:
|
|
self.size = x, y
|
|
self.tile2 = [(decoder,
|
|
(0, 0, x, y),
|
|
fp.tell(),
|
|
0)]
|
|
return
|
|
|
|
s = fp.readline()
|
|
if not s:
|
|
break
|
|
|
|
if not box:
|
|
raise IOError("cannot determine EPS bounding box")
|
|
|
|
def load(self):
|
|
# Load EPS via Ghostscript
|
|
if not self.tile:
|
|
return
|
|
self.im = Ghostscript(self.tile, self.size, self.fp)
|
|
self.mode = self.im.mode
|
|
self.size = self.im.size
|
|
self.tile = []
|
|
|
|
#
|
|
# --------------------------------------------------------------------
|
|
|
|
def _save(im, fp, filename, eps=1):
|
|
"""EPS Writer for the Python Imaging Library."""
|
|
|
|
#
|
|
# make sure image data is available
|
|
im.load()
|
|
|
|
#
|
|
# determine postscript image mode
|
|
if im.mode == "L":
|
|
operator = (8, 1, "image")
|
|
elif im.mode == "RGB":
|
|
operator = (8, 3, "false 3 colorimage")
|
|
elif im.mode == "CMYK":
|
|
operator = (8, 4, "false 4 colorimage")
|
|
else:
|
|
raise ValueError("image mode is not supported")
|
|
|
|
class NoCloseStream:
|
|
def __init__(self, fp):
|
|
self.fp = fp
|
|
def __getattr__(self, name):
|
|
return getattr(self.fp, name)
|
|
def close(self):
|
|
pass
|
|
|
|
base_fp = fp
|
|
fp = io.TextIOWrapper(NoCloseStream(fp), encoding='latin-1')
|
|
|
|
if eps:
|
|
#
|
|
# write EPS header
|
|
fp.write("%!PS-Adobe-3.0 EPSF-3.0\n")
|
|
fp.write("%%Creator: PIL 0.1 EpsEncode\n")
|
|
#fp.write("%%CreationDate: %s"...)
|
|
fp.write("%%%%BoundingBox: 0 0 %d %d\n" % im.size)
|
|
fp.write("%%Pages: 1\n")
|
|
fp.write("%%EndComments\n")
|
|
fp.write("%%Page: 1 1\n")
|
|
fp.write("%%ImageData: %d %d " % im.size)
|
|
fp.write("%d %d 0 1 1 \"%s\"\n" % operator)
|
|
|
|
#
|
|
# image header
|
|
fp.write("gsave\n")
|
|
fp.write("10 dict begin\n")
|
|
fp.write("/buf %d string def\n" % (im.size[0] * operator[1]))
|
|
fp.write("%d %d scale\n" % im.size)
|
|
fp.write("%d %d 8\n" % im.size) # <= bits
|
|
fp.write("[%d 0 0 -%d 0 %d]\n" % (im.size[0], im.size[1], im.size[1]))
|
|
fp.write("{ currentfile buf readhexstring pop } bind\n")
|
|
fp.write(operator[2] + "\n")
|
|
fp.flush()
|
|
|
|
ImageFile._save(im, base_fp, [("eps", (0,0)+im.size, 0, None)])
|
|
|
|
fp.write("\n%%%%EndBinary\n")
|
|
fp.write("grestore end\n")
|
|
fp.flush()
|
|
|
|
#
|
|
# --------------------------------------------------------------------
|
|
|
|
Image.register_open(EpsImageFile.format, EpsImageFile, _accept)
|
|
|
|
Image.register_save(EpsImageFile.format, _save)
|
|
|
|
Image.register_extension(EpsImageFile.format, ".ps")
|
|
Image.register_extension(EpsImageFile.format, ".eps")
|
|
|
|
Image.register_mime(EpsImageFile.format, "application/postscript")
|