mirror of
https://github.com/python-pillow/Pillow.git
synced 2025-11-04 09:57:43 +03:00
259 lines
6.6 KiB
Python
259 lines
6.6 KiB
Python
#
|
|
# The Python Imaging Library.
|
|
# $Id$
|
|
#
|
|
# PDF (Acrobat) file handling
|
|
#
|
|
# History:
|
|
# 1996-07-16 fl Created
|
|
# 1997-01-18 fl Fixed header
|
|
# 2004-02-21 fl Fixes for 1/L/CMYK images, etc.
|
|
# 2004-02-24 fl Fixes for 1 and P images.
|
|
#
|
|
# Copyright (c) 1997-2004 by Secret Labs AB. All rights reserved.
|
|
# Copyright (c) 1996-1997 by Fredrik Lundh.
|
|
#
|
|
# See the README file for information on usage and redistribution.
|
|
#
|
|
|
|
##
|
|
# Image plugin for PDF images (output only).
|
|
##
|
|
|
|
from PIL import Image, ImageFile
|
|
from PIL._binary import i8
|
|
import io
|
|
|
|
__version__ = "0.4"
|
|
|
|
|
|
#
|
|
# --------------------------------------------------------------------
|
|
|
|
# object ids:
|
|
# 1. catalogue
|
|
# 2. pages
|
|
# 3. image
|
|
# 4. page
|
|
# 5. page contents
|
|
|
|
def _obj(fp, obj, **dict):
|
|
fp.write("%d 0 obj\n" % obj)
|
|
if dict:
|
|
fp.write("<<\n")
|
|
for k, v in dict.items():
|
|
if v is not None:
|
|
fp.write("/%s %s\n" % (k, v))
|
|
fp.write(">>\n")
|
|
|
|
|
|
def _endobj(fp):
|
|
fp.write("endobj\n")
|
|
|
|
|
|
def _save_all(im, fp, filename):
|
|
_save(im, fp, filename, save_all=True)
|
|
|
|
|
|
##
|
|
# (Internal) Image save plugin for the PDF format.
|
|
|
|
def _save(im, fp, filename, save_all=False):
|
|
resolution = im.encoderinfo.get("resolution", 72.0)
|
|
|
|
#
|
|
# make sure image data is available
|
|
im.load()
|
|
|
|
xref = [0]
|
|
|
|
class TextWriter(object):
|
|
def __init__(self, fp):
|
|
self.fp = fp
|
|
|
|
def __getattr__(self, name):
|
|
return getattr(self.fp, name)
|
|
|
|
def write(self, value):
|
|
self.fp.write(value.encode('latin-1'))
|
|
|
|
fp = TextWriter(fp)
|
|
|
|
fp.write("%PDF-1.2\n")
|
|
fp.write("% created by PIL PDF driver " + __version__ + "\n")
|
|
|
|
# FIXME: Should replace ASCIIHexDecode with RunLengthDecode (packbits)
|
|
# or LZWDecode (tiff/lzw compression). Note that PDF 1.2 also supports
|
|
# Flatedecode (zip compression).
|
|
|
|
bits = 8
|
|
params = None
|
|
|
|
if im.mode == "1":
|
|
filter = "/ASCIIHexDecode"
|
|
colorspace = "/DeviceGray"
|
|
procset = "/ImageB" # grayscale
|
|
bits = 1
|
|
elif im.mode == "L":
|
|
filter = "/DCTDecode"
|
|
# params = "<< /Predictor 15 /Columns %d >>" % (width-2)
|
|
colorspace = "/DeviceGray"
|
|
procset = "/ImageB" # grayscale
|
|
elif im.mode == "P":
|
|
filter = "/ASCIIHexDecode"
|
|
colorspace = "[ /Indexed /DeviceRGB 255 <"
|
|
palette = im.im.getpalette("RGB")
|
|
for i in range(256):
|
|
r = i8(palette[i*3])
|
|
g = i8(palette[i*3+1])
|
|
b = i8(palette[i*3+2])
|
|
colorspace += "%02x%02x%02x " % (r, g, b)
|
|
colorspace += "> ]"
|
|
procset = "/ImageI" # indexed color
|
|
elif im.mode == "RGB":
|
|
filter = "/DCTDecode"
|
|
colorspace = "/DeviceRGB"
|
|
procset = "/ImageC" # color images
|
|
elif im.mode == "CMYK":
|
|
filter = "/DCTDecode"
|
|
colorspace = "/DeviceCMYK"
|
|
procset = "/ImageC" # color images
|
|
else:
|
|
raise ValueError("cannot save mode %s" % im.mode)
|
|
|
|
#
|
|
# catalogue
|
|
|
|
xref.append(fp.tell())
|
|
_obj(
|
|
fp, 1,
|
|
Type="/Catalog",
|
|
Pages="2 0 R")
|
|
_endobj(fp)
|
|
|
|
#
|
|
# pages
|
|
numberOfPages = 1
|
|
if save_all:
|
|
try:
|
|
numberOfPages = im.n_frames
|
|
except AttributeError:
|
|
# Image format does not have n_frames. It is a single frame image
|
|
pass
|
|
pages = [str(pageNumber*3+4)+" 0 R"
|
|
for pageNumber in range(0, numberOfPages)]
|
|
|
|
xref.append(fp.tell())
|
|
_obj(
|
|
fp, 2,
|
|
Type="/Pages",
|
|
Count=len(pages),
|
|
Kids="["+"\n".join(pages)+"]")
|
|
_endobj(fp)
|
|
|
|
for pageNumber in range(0, numberOfPages):
|
|
im.seek(pageNumber)
|
|
|
|
#
|
|
# image
|
|
|
|
op = io.BytesIO()
|
|
|
|
if filter == "/ASCIIHexDecode":
|
|
if bits == 1:
|
|
# FIXME: the hex encoder doesn't support packed 1-bit
|
|
# images; do things the hard way...
|
|
data = im.tobytes("raw", "1")
|
|
im = Image.new("L", (len(data), 1), None)
|
|
im.putdata(data)
|
|
ImageFile._save(im, op, [("hex", (0, 0)+im.size, 0, im.mode)])
|
|
elif filter == "/DCTDecode":
|
|
Image.SAVE["JPEG"](im, op, filename)
|
|
elif filter == "/FlateDecode":
|
|
ImageFile._save(im, op, [("zip", (0, 0)+im.size, 0, im.mode)])
|
|
elif filter == "/RunLengthDecode":
|
|
ImageFile._save(im, op, [("packbits", (0, 0)+im.size, 0, im.mode)])
|
|
else:
|
|
raise ValueError("unsupported PDF filter (%s)" % filter)
|
|
|
|
#
|
|
# Get image characteristics
|
|
|
|
width, height = im.size
|
|
|
|
xref.append(fp.tell())
|
|
_obj(
|
|
fp, pageNumber*3+3,
|
|
Type="/XObject",
|
|
Subtype="/Image",
|
|
Width=width, # * 72.0 / resolution,
|
|
Height=height, # * 72.0 / resolution,
|
|
Length=len(op.getvalue()),
|
|
Filter=filter,
|
|
BitsPerComponent=bits,
|
|
DecodeParams=params,
|
|
ColorSpace=colorspace)
|
|
|
|
fp.write("stream\n")
|
|
fp.fp.write(op.getvalue())
|
|
fp.write("\nendstream\n")
|
|
|
|
_endobj(fp)
|
|
|
|
#
|
|
# page
|
|
|
|
xref.append(fp.tell())
|
|
_obj(fp, pageNumber*3+4)
|
|
fp.write(
|
|
"<<\n/Type /Page\n/Parent 2 0 R\n"
|
|
"/Resources <<\n/ProcSet [ /PDF %s ]\n"
|
|
"/XObject << /image %d 0 R >>\n>>\n"
|
|
"/MediaBox [ 0 0 %d %d ]\n/Contents %d 0 R\n>>\n" % (
|
|
procset,
|
|
pageNumber*3+3,
|
|
int(width * 72.0 / resolution),
|
|
int(height * 72.0 / resolution),
|
|
pageNumber*3+5))
|
|
_endobj(fp)
|
|
|
|
#
|
|
# page contents
|
|
|
|
op = TextWriter(io.BytesIO())
|
|
|
|
op.write(
|
|
"q %d 0 0 %d 0 0 cm /image Do Q\n" % (
|
|
int(width * 72.0 / resolution),
|
|
int(height * 72.0 / resolution)))
|
|
|
|
xref.append(fp.tell())
|
|
_obj(fp, pageNumber*3+5, Length=len(op.fp.getvalue()))
|
|
|
|
fp.write("stream\n")
|
|
fp.fp.write(op.fp.getvalue())
|
|
fp.write("\nendstream\n")
|
|
|
|
_endobj(fp)
|
|
|
|
#
|
|
# trailer
|
|
startxref = fp.tell()
|
|
fp.write("xref\n0 %d\n0000000000 65535 f \n" % len(xref))
|
|
for x in xref[1:]:
|
|
fp.write("%010d 00000 n \n" % x)
|
|
fp.write("trailer\n<<\n/Size %d\n/Root 1 0 R\n>>\n" % len(xref))
|
|
fp.write("startxref\n%d\n%%%%EOF\n" % startxref)
|
|
if hasattr(fp, "flush"):
|
|
fp.flush()
|
|
|
|
#
|
|
# --------------------------------------------------------------------
|
|
|
|
Image.register_save("PDF", _save)
|
|
Image.register_save_all("PDF", _save_all)
|
|
|
|
Image.register_extension("PDF", ".pdf")
|
|
|
|
Image.register_mime("PDF", "application/pdf")
|