mirror of
https://github.com/python-pillow/Pillow.git
synced 2024-12-26 18:06:18 +03:00
429 lines
12 KiB
Python
429 lines
12 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)
|
|
# 2014-05-07 e Handling of EPS with binary preview and fixed resolution
|
|
# resizing
|
|
#
|
|
# 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.
|
|
#
|
|
|
|
import re
|
|
import io
|
|
import sys
|
|
from PIL import Image, ImageFile, _binary
|
|
|
|
__version__ = "0.5"
|
|
|
|
#
|
|
# --------------------------------------------------------------------
|
|
|
|
i32 = _binary.i32le
|
|
o32 = _binary.o32le
|
|
|
|
split = re.compile(r"^%%([^:]*):[ \t]*(.*)[ \t]*$")
|
|
field = re.compile(r"^%[%!\w]([^:]*)[ \t]*$")
|
|
|
|
gs_windows_binary = None
|
|
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 has_ghostscript():
|
|
if gs_windows_binary:
|
|
return True
|
|
if not sys.platform.startswith('win'):
|
|
import subprocess
|
|
try:
|
|
gs = subprocess.Popen(['gs', '--version'], stdout=subprocess.PIPE)
|
|
gs.stdout.read()
|
|
return True
|
|
except OSError:
|
|
# no ghostscript
|
|
pass
|
|
return False
|
|
|
|
|
|
def Ghostscript(tile, size, fp, scale=1):
|
|
"""Render an image using Ghostscript"""
|
|
|
|
# Unpack decoder tile
|
|
decoder, tile, offset, data = tile[0]
|
|
length, bbox = data
|
|
|
|
# Hack to support hi-res rendering
|
|
scale = int(scale) or 1
|
|
# orig_size = size
|
|
# orig_bbox = bbox
|
|
size = (size[0] * scale, size[1] * scale)
|
|
# resolution is dependent on bbox and size
|
|
res = (float((72.0 * size[0]) / (bbox[2]-bbox[0])),
|
|
float((72.0 * size[1]) / (bbox[3]-bbox[1])))
|
|
# print("Ghostscript", scale, size, orig_size, bbox, orig_bbox, res)
|
|
|
|
import os
|
|
import subprocess
|
|
import tempfile
|
|
|
|
out_fd, outfile = tempfile.mkstemp()
|
|
os.close(out_fd)
|
|
|
|
infile_temp = None
|
|
if hasattr(fp, 'name') and os.path.exists(fp.name):
|
|
infile = fp.name
|
|
else:
|
|
in_fd, infile_temp = tempfile.mkstemp()
|
|
os.close(in_fd)
|
|
infile = infile_temp
|
|
|
|
# ignore length and offset!
|
|
# ghostscript can read it
|
|
# copy whole file to read in ghostscript
|
|
with open(infile_temp, 'wb') as f:
|
|
# fetch length of fp
|
|
fp.seek(0, 2)
|
|
fsize = fp.tell()
|
|
# ensure start position
|
|
# go back
|
|
fp.seek(0)
|
|
lengthfile = fsize
|
|
while lengthfile > 0:
|
|
s = fp.read(min(lengthfile, 100*1024))
|
|
if not s:
|
|
break
|
|
lengthfile -= len(s)
|
|
f.write(s)
|
|
|
|
# Build ghostscript command
|
|
command = ["gs",
|
|
"-q", # quiet mode
|
|
"-g%dx%d" % size, # set output geometry (pixels)
|
|
"-r%fx%f" % res, # set input DPI (dots per inch)
|
|
"-dNOPAUSE -dSAFER", # don't pause between pages,
|
|
# safe mode
|
|
"-sDEVICE=ppmraw", # ppm driver
|
|
"-sOutputFile=%s" % outfile, # output file
|
|
"-c", "%d %d translate" % (-bbox[0], -bbox[1]),
|
|
# adjust for image origin
|
|
"-f", infile, # input file
|
|
]
|
|
|
|
if gs_windows_binary is not None:
|
|
if not gs_windows_binary:
|
|
raise WindowsError('Unable to locate Ghostscript on paths')
|
|
command[0] = gs_windows_binary
|
|
|
|
# push data through ghostscript
|
|
try:
|
|
gs = subprocess.Popen(command, stdin=subprocess.PIPE,
|
|
stdout=subprocess.PIPE)
|
|
gs.stdin.close()
|
|
status = gs.wait()
|
|
if status:
|
|
raise IOError("gs failed (status %d)" % status)
|
|
im = Image.core.open_ppm(outfile)
|
|
finally:
|
|
try:
|
|
os.unlink(outfile)
|
|
if infile_temp:
|
|
os.unlink(infile_temp)
|
|
except OSError:
|
|
pass
|
|
|
|
return im
|
|
|
|
|
|
class PSFile(object):
|
|
"""
|
|
Wrapper for bytesio object that treats either CR or LF as end of line.
|
|
"""
|
|
def __init__(self, fp):
|
|
self.fp = fp
|
|
self.char = None
|
|
|
|
def seek(self, offset, whence=0):
|
|
self.char = None
|
|
self.fp.seek(offset, whence)
|
|
|
|
def readline(self):
|
|
s = self.char or b""
|
|
self.char = None
|
|
|
|
c = self.fp.read(1)
|
|
while c not in b"\r\n":
|
|
s = s + c
|
|
c = self.fp.read(1)
|
|
|
|
self.char = self.fp.read(1)
|
|
# line endings can be 1 or 2 of \r \n, in either order
|
|
if self.char in b"\r\n":
|
|
self.char = None
|
|
|
|
return s.decode('latin-1')
|
|
|
|
|
|
def _accept(prefix):
|
|
return prefix[:4] == b"%!PS" or \
|
|
(len(prefix) >= 4 and 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"
|
|
|
|
mode_map = {1: "L", 2: "LAB", 3: "RGB"}
|
|
|
|
def _open(self):
|
|
(length, offset) = self._find_offset(self.fp)
|
|
|
|
# Rewrap the open file pointer in something that will
|
|
# convert line endings and decode to latin-1.
|
|
try:
|
|
if bytes is str:
|
|
# Python2, no encoding conversion necessary
|
|
fp = open(self.fp.name, "Ur")
|
|
else:
|
|
# Python3, can use bare open command.
|
|
fp = open(self.fp.name, "Ur", encoding='latin-1')
|
|
except:
|
|
# Expect this for bytesio/stringio
|
|
fp = PSFile(self.fp)
|
|
|
|
# go to offset - start of "%!PS"
|
|
fp.seek(offset)
|
|
|
|
box = None
|
|
|
|
self.mode = "RGB"
|
|
self.size = 1, 1 # FIXME: huh?
|
|
|
|
#
|
|
# Load EPS header
|
|
|
|
s = fp.readline().strip('\r\n')
|
|
|
|
while s:
|
|
if len(s) > 255:
|
|
raise SyntaxError("not an EPS file")
|
|
|
|
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(i)) for i 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] == '%':
|
|
# handle non-DSC Postscript comments that some
|
|
# tools mistakenly put in the Comments section
|
|
pass
|
|
else:
|
|
raise IOError("bad EPS header")
|
|
|
|
s = fp.readline().strip('\r\n')
|
|
|
|
if s[:1] != "%":
|
|
break
|
|
|
|
#
|
|
# Scan for an "ImageData" descriptor
|
|
|
|
while s[:1] == "%":
|
|
|
|
if len(s) > 255:
|
|
raise SyntaxError("not an EPS file")
|
|
|
|
if s[:11] == "%ImageData:":
|
|
# Encoded bitmapped image.
|
|
x, y, bi, mo = s[11:].split(None, 7)[:4]
|
|
|
|
if int(bi) != 8:
|
|
break
|
|
try:
|
|
self.mode = self.mode_map[int(mo)]
|
|
except:
|
|
break
|
|
|
|
self.size = int(x), int(y)
|
|
return
|
|
|
|
s = fp.readline().strip('\r\n')
|
|
if not s:
|
|
break
|
|
|
|
if not box:
|
|
raise IOError("cannot determine EPS bounding box")
|
|
|
|
def _find_offset(self, fp):
|
|
|
|
s = fp.read(160)
|
|
|
|
if s[:4] == b"%!PS":
|
|
# for HEAD without binary preview
|
|
fp.seek(0, 2)
|
|
length = fp.tell()
|
|
offset = 0
|
|
elif i32(s[0:4]) == 0xC6D3D0C5:
|
|
# FIX for: Some EPS file not handled correctly / issue #302
|
|
# EPS can contain binary data
|
|
# or start directly with latin coding
|
|
# more info see:
|
|
# http://partners.adobe.com/public/developer/en/ps/5002.EPSF_Spec.pdf
|
|
offset = i32(s[4:8])
|
|
length = i32(s[8:12])
|
|
else:
|
|
raise SyntaxError("not an EPS file")
|
|
|
|
return (length, offset)
|
|
|
|
def load(self, scale=1):
|
|
# Load EPS via Ghostscript
|
|
if not self.tile:
|
|
return
|
|
self.im = Ghostscript(self.tile, self.size, self.fp, scale)
|
|
self.mode = self.im.mode
|
|
self.size = self.im.size
|
|
self.tile = []
|
|
|
|
def load_seek(self, *args, **kwargs):
|
|
# we can't incrementally load, so force ImageFile.parser to
|
|
# use our custom load method by defining this method.
|
|
pass
|
|
|
|
|
|
#
|
|
# --------------------------------------------------------------------
|
|
|
|
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(object):
|
|
def __init__(self, fp):
|
|
self.fp = fp
|
|
|
|
def __getattr__(self, name):
|
|
return getattr(self.fp, name)
|
|
|
|
def close(self):
|
|
pass
|
|
|
|
base_fp = fp
|
|
if fp != sys.stdout:
|
|
fp = NoCloseStream(fp)
|
|
if sys.version_info[0] > 2:
|
|
fp = io.TextIOWrapper(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")
|
|
if hasattr(fp, "flush"):
|
|
fp.flush()
|
|
|
|
ImageFile._save(im, base_fp, [("eps", (0, 0)+im.size, 0, None)])
|
|
|
|
fp.write("\n%%%%EndBinary\n")
|
|
fp.write("grestore end\n")
|
|
if hasattr(fp, "flush"):
|
|
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")
|