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409 lines
11 KiB
Python
409 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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# EPS file handling
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#
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# History:
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# 1995-09-01 fl Created (0.1)
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# 1996-05-18 fl Don't choke on "atend" fields, Ghostscript interface (0.2)
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# 1996-08-22 fl Don't choke on floating point BoundingBox values
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# 1996-08-23 fl Handle files from Macintosh (0.3)
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# 2001-02-17 fl Use 're' instead of 'regex' (Python 2.1) (0.4)
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# 2003-09-07 fl Check gs.close status (from Federico Di Gregorio) (0.5)
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#
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# Copyright (c) 1997-2003 by Secret Labs AB.
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# Copyright (c) 1995-2003 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__ = "0.5"
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import re
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import io
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from PIL import Image, ImageFile, _binary
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#
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# --------------------------------------------------------------------
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i32 = _binary.i32le
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o32 = _binary.o32le
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split = re.compile(r"^%%([^:]*):[ \t]*(.*)[ \t]*$")
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field = re.compile(r"^%[%!\w]([^:]*)[ \t]*$")
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gs_windows_binary = None
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import sys
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if sys.platform.startswith('win'):
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import shutil
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if hasattr(shutil, 'which'):
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which = shutil.which
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else:
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# Python < 3.3
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import distutils.spawn
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which = distutils.spawn.find_executable
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for binary in ('gswin32c', 'gswin64c', 'gs'):
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if which(binary) is not None:
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gs_windows_binary = binary
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break
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else:
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gs_windows_binary = False
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def Ghostscript(tile, size, fp, scale=1):
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"""Render an image using Ghostscript"""
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# Unpack decoder tile
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decoder, tile, offset, data = tile[0]
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length, bbox = data
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#Hack to support hi-res rendering
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scale = int(scale) or 1
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orig_size = size
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orig_bbox = bbox
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size = (size[0] * scale, size[1] * scale)
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bbox = [bbox[0], bbox[1], bbox[2] * scale, bbox[3] * scale]
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#print("Ghostscript", scale, size, orig_size, bbox, orig_bbox)
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import tempfile, os, subprocess
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outfile = tempfile.mktemp()
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infile = tempfile.mktemp()
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with open(infile, 'wb') as f:
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fp.seek(offset)
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while length >0:
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s = fp.read(100*1024)
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if not s:
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break
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length = length - len(s)
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f.write(s)
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# Build ghostscript command
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command = ["gs",
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"-q", # quiet mode
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"-g%dx%d" % size, # set output geometry (pixels)
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"-r%d" % (72*scale), # set input DPI (dots per inch)
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"-dNOPAUSE -dSAFER", # don't pause between pages, safe mode
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"-sDEVICE=ppmraw", # ppm driver
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"-sOutputFile=%s" % outfile, # output file
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"-c", "%d %d translate" % (-bbox[0], -bbox[1]),
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# adjust for image origin
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"-f", infile, # input file
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]
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if gs_windows_binary is not None:
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if not gs_windows_binary:
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raise WindowsError('Unable to locate Ghostscript on paths')
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command[0] = gs_windows_binary
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# push data through ghostscript
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try:
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gs = subprocess.Popen(command, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
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gs.stdin.close()
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status = gs.wait()
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if status:
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raise IOError("gs failed (status %d)" % status)
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im = Image.core.open_ppm(outfile)
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finally:
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try:
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os.unlink(outfile)
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os.unlink(infile)
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except: pass
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return im
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class PSFile:
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"""Wrapper that treats either CR or LF as end of line."""
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def __init__(self, fp):
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self.fp = fp
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self.char = None
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def __getattr__(self, id):
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v = getattr(self.fp, id)
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setattr(self, id, v)
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return v
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def seek(self, offset, whence=0):
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self.char = None
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self.fp.seek(offset, whence)
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def read(self, count):
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return self.fp.read(count).decode('latin-1')
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def tell(self):
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pos = self.fp.tell()
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if self.char:
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pos = pos - 1
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return pos
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def readline(self):
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s = b""
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if self.char:
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c = self.char
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self.char = None
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else:
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c = self.fp.read(1)
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while c not in b"\r\n":
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s = s + c
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c = self.fp.read(1)
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if c == b"\r":
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self.char = self.fp.read(1)
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if self.char == b"\n":
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self.char = None
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return s.decode('latin-1') + "\n"
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def _accept(prefix):
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return prefix[:4] == b"%!PS" or i32(prefix) == 0xC6D3D0C5
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##
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# Image plugin for Encapsulated Postscript. This plugin supports only
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# a few variants of this format.
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class EpsImageFile(ImageFile.ImageFile):
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"""EPS File Parser for the Python Imaging Library"""
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format = "EPS"
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format_description = "Encapsulated Postscript"
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def _open(self):
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# FIXME: should check the first 512 bytes to see if this
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# really is necessary (platform-dependent, though...)
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fp = PSFile(self.fp)
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# HEAD
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s = fp.read(512)
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if s[:4] == "%!PS":
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offset = 0
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fp.seek(0, 2)
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length = fp.tell()
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elif i32(s) == 0xC6D3D0C5:
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offset = i32(s[4:])
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length = i32(s[8:])
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fp.seek(offset)
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else:
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raise SyntaxError("not an EPS file")
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fp.seek(offset)
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box = None
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self.mode = "RGB"
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self.size = 1, 1 # FIXME: huh?
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#
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# Load EPS header
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s = fp.readline()
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while s:
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if len(s) > 255:
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raise SyntaxError("not an EPS file")
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if s[-2:] == '\r\n':
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s = s[:-2]
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elif s[-1:] == '\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 v:
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raise SyntaxError("not an EPS file")
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if m:
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k, v = m.group(1, 2)
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self.info[k] = v
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if k == "BoundingBox":
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try:
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# Note: The DSC spec says that BoundingBox
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# fields should be integers, but some drivers
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# put floating point values there anyway.
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box = [int(float(s)) for s in v.split()]
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self.size = box[2] - box[0], box[3] - box[1]
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self.tile = [("eps", (0,0) + self.size, offset,
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(length, box))]
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except:
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pass
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else:
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m = field.match(s)
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if m:
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k = m.group(1)
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if k == "EndComments":
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break
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if k[:8] == "PS-Adobe":
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self.info[k[:8]] = k[9:]
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else:
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self.info[k] = ""
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elif s[0:1] == '%':
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# handle non-DSC Postscript comments that some
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# tools mistakenly put in the Comments section
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pass
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else:
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raise IOError("bad EPS header")
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s = fp.readline()
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if s[:1] != "%":
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break
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#
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# Scan for an "ImageData" descriptor
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while s[0] == "%":
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if len(s) > 255:
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raise SyntaxError("not an EPS file")
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if s[-2:] == '\r\n':
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s = s[:-2]
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elif s[-1:] == '\n':
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s = s[:-1]
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if s[:11] == "%ImageData:":
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[x, y, bi, mo, z3, z4, en, id] =\
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s[11:].split(None, 7)
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x = int(x); y = int(y)
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bi = int(bi)
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mo = int(mo)
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en = int(en)
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if en == 1:
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decoder = "eps_binary"
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elif en == 2:
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decoder = "eps_hex"
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else:
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break
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if bi != 8:
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break
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if mo == 1:
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self.mode = "L"
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elif mo == 2:
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self.mode = "LAB"
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elif mo == 3:
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self.mode = "RGB"
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else:
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break
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if id[:1] == id[-1:] == '"':
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id = id[1:-1]
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# Scan forward to the actual image data
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while True:
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s = fp.readline()
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if not s:
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break
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if s[:len(id)] == id:
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self.size = x, y
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self.tile2 = [(decoder,
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(0, 0, x, y),
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fp.tell(),
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0)]
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return
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s = fp.readline()
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if not s:
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break
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if not box:
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raise IOError("cannot determine EPS bounding box")
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def load(self, scale=1):
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# Load EPS via Ghostscript
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if not self.tile:
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return
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self.im = Ghostscript(self.tile, self.size, self.fp, scale)
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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 load_seek(self,*args,**kwargs):
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# we can't incrementally load, so force ImageFile.parser to
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# use our custom load method by defining this method.
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pass
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#
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# --------------------------------------------------------------------
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def _save(im, fp, filename, eps=1):
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"""EPS Writer for the Python Imaging Library."""
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#
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# make sure image data is available
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im.load()
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#
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# determine postscript image mode
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if im.mode == "L":
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operator = (8, 1, "image")
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elif im.mode == "RGB":
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operator = (8, 3, "false 3 colorimage")
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elif im.mode == "CMYK":
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operator = (8, 4, "false 4 colorimage")
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else:
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raise ValueError("image mode is not supported")
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class NoCloseStream:
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def __init__(self, fp):
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self.fp = fp
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def __getattr__(self, name):
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return getattr(self.fp, name)
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def close(self):
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pass
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base_fp = fp
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fp = NoCloseStream(fp)
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if sys.version_info[0] > 2:
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fp = io.TextIOWrapper(fp, encoding='latin-1')
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if eps:
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#
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# write EPS header
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fp.write("%!PS-Adobe-3.0 EPSF-3.0\n")
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fp.write("%%Creator: PIL 0.1 EpsEncode\n")
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#fp.write("%%CreationDate: %s"...)
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fp.write("%%%%BoundingBox: 0 0 %d %d\n" % im.size)
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fp.write("%%Pages: 1\n")
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fp.write("%%EndComments\n")
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fp.write("%%Page: 1 1\n")
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fp.write("%%ImageData: %d %d " % im.size)
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fp.write("%d %d 0 1 1 \"%s\"\n" % operator)
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#
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# image header
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fp.write("gsave\n")
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fp.write("10 dict begin\n")
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fp.write("/buf %d string def\n" % (im.size[0] * operator[1]))
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fp.write("%d %d scale\n" % im.size)
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fp.write("%d %d 8\n" % im.size) # <= bits
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fp.write("[%d 0 0 -%d 0 %d]\n" % (im.size[0], im.size[1], im.size[1]))
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fp.write("{ currentfile buf readhexstring pop } bind\n")
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fp.write(operator[2] + "\n")
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fp.flush()
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ImageFile._save(im, base_fp, [("eps", (0,0)+im.size, 0, None)])
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fp.write("\n%%%%EndBinary\n")
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fp.write("grestore end\n")
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fp.flush()
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#
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# --------------------------------------------------------------------
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Image.register_open(EpsImageFile.format, EpsImageFile, _accept)
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Image.register_save(EpsImageFile.format, _save)
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Image.register_extension(EpsImageFile.format, ".ps")
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Image.register_extension(EpsImageFile.format, ".eps")
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Image.register_mime(EpsImageFile.format, "application/postscript")
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