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https://github.com/python-pillow/Pillow.git
synced 2024-12-24 17:06:16 +03:00
Added PDF multipage saving
This commit is contained in:
Andrew Murray
parent
eecd489ccf
commit
4e31fb745f
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@ -51,17 +51,21 @@ def _endobj(fp):
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fp.write("endobj\n")
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def _save_all(im, fp, filename):
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_save(im, fp, filename, save_all=True)
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##
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# (Internal) Image save plugin for the PDF format.
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def _save(im, fp, filename):
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def _save(im, fp, filename, save_all=False):
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resolution = im.encoderinfo.get("resolution", 72.0)
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#
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# make sure image data is available
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im.load()
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xref = [0]*(5+1) # placeholders
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xref = [0]
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class TextWriter(object):
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def __init__(self, fp):
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@ -78,11 +82,6 @@ def _save(im, fp, filename):
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fp.write("%PDF-1.2\n")
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fp.write("% created by PIL PDF driver " + __version__ + "\n")
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#
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# Get image characteristics
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width, height = im.size
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# FIXME: Should replace ASCIIHexDecode with RunLengthDecode (packbits)
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# or LZWDecode (tiff/lzw compression). Note that PDF 1.2 also supports
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# Flatedecode (zip compression).
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@ -125,7 +124,7 @@ def _save(im, fp, filename):
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#
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# catalogue
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xref[1] = fp.tell()
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xref.append(fp.tell())
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_obj(
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fp, 1,
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Type="/Catalog",
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@ -134,89 +133,108 @@ def _save(im, fp, filename):
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#
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# pages
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numberOfPages = 1
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if save_all:
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try:
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numberOfPages = im.n_frames
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except AttributeError:
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# Image format does not have n_frames. It is a single frame image
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pass
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pages = [str(pageNumber*3+4)+" 0 R"
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for pageNumber in range(0, numberOfPages)]
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xref[2] = fp.tell()
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xref.append(fp.tell())
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_obj(
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fp, 2,
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Type="/Pages",
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Count=1,
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Kids="[4 0 R]")
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Count=len(pages),
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Kids="["+"\n".join(pages)+"]")
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_endobj(fp)
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#
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# image
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for pageNumber in range(0, numberOfPages):
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im.seek(pageNumber)
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op = io.BytesIO()
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#
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# image
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if filter == "/ASCIIHexDecode":
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if bits == 1:
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# FIXME: the hex encoder doesn't support packed 1-bit
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# images; do things the hard way...
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data = im.tobytes("raw", "1")
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im = Image.new("L", (len(data), 1), None)
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im.putdata(data)
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ImageFile._save(im, op, [("hex", (0, 0)+im.size, 0, im.mode)])
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elif filter == "/DCTDecode":
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Image.SAVE["JPEG"](im, op, filename)
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elif filter == "/FlateDecode":
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ImageFile._save(im, op, [("zip", (0, 0)+im.size, 0, im.mode)])
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elif filter == "/RunLengthDecode":
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ImageFile._save(im, op, [("packbits", (0, 0)+im.size, 0, im.mode)])
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else:
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raise ValueError("unsupported PDF filter (%s)" % filter)
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op = io.BytesIO()
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xref[3] = fp.tell()
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_obj(
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fp, 3,
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Type="/XObject",
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Subtype="/Image",
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Width=width, # * 72.0 / resolution,
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Height=height, # * 72.0 / resolution,
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Length=len(op.getvalue()),
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Filter=filter,
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BitsPerComponent=bits,
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DecodeParams=params,
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ColorSpace=colorspace)
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if filter == "/ASCIIHexDecode":
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if bits == 1:
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# FIXME: the hex encoder doesn't support packed 1-bit
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# images; do things the hard way...
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data = im.tobytes("raw", "1")
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im = Image.new("L", (len(data), 1), None)
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im.putdata(data)
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ImageFile._save(im, op, [("hex", (0, 0)+im.size, 0, im.mode)])
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elif filter == "/DCTDecode":
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Image.SAVE["JPEG"](im, op, filename)
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elif filter == "/FlateDecode":
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ImageFile._save(im, op, [("zip", (0, 0)+im.size, 0, im.mode)])
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elif filter == "/RunLengthDecode":
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ImageFile._save(im, op, [("packbits", (0, 0)+im.size, 0, im.mode)])
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else:
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raise ValueError("unsupported PDF filter (%s)" % filter)
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fp.write("stream\n")
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fp.fp.write(op.getvalue())
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fp.write("\nendstream\n")
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#
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# Get image characteristics
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_endobj(fp)
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width, height = im.size
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#
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# page
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xref.append(fp.tell())
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_obj(
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fp, pageNumber*3+3,
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Type="/XObject",
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Subtype="/Image",
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Width=width, # * 72.0 / resolution,
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Height=height, # * 72.0 / resolution,
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Length=len(op.getvalue()),
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Filter=filter,
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BitsPerComponent=bits,
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DecodeParams=params,
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ColorSpace=colorspace)
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xref[4] = fp.tell()
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_obj(fp, 4)
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fp.write(
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"<<\n/Type /Page\n/Parent 2 0 R\n"
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"/Resources <<\n/ProcSet [ /PDF %s ]\n"
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"/XObject << /image 3 0 R >>\n>>\n"
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"/MediaBox [ 0 0 %d %d ]\n/Contents 5 0 R\n>>\n" % (
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procset,
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int(width * 72.0 / resolution),
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int(height * 72.0 / resolution)))
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_endobj(fp)
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fp.write("stream\n")
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fp.fp.write(op.getvalue())
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fp.write("\nendstream\n")
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#
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# page contents
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_endobj(fp)
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op = TextWriter(io.BytesIO())
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#
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# page
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op.write(
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"q %d 0 0 %d 0 0 cm /image Do Q\n" % (
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int(width * 72.0 / resolution),
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int(height * 72.0 / resolution)))
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xref.append(fp.tell())
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_obj(fp, pageNumber*3+4)
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fp.write(
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"<<\n/Type /Page\n/Parent 2 0 R\n"
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"/Resources <<\n/ProcSet [ /PDF %s ]\n"
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"/XObject << /image %d 0 R >>\n>>\n"
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"/MediaBox [ 0 0 %d %d ]\n/Contents %d 0 R\n>>\n" % (
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procset,
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pageNumber*3+3,
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int(width * 72.0 / resolution),
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int(height * 72.0 / resolution),
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pageNumber*3+5))
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_endobj(fp)
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xref[5] = fp.tell()
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_obj(fp, 5, Length=len(op.fp.getvalue()))
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#
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# page contents
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fp.write("stream\n")
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fp.fp.write(op.fp.getvalue())
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fp.write("\nendstream\n")
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op = TextWriter(io.BytesIO())
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_endobj(fp)
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op.write(
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"q %d 0 0 %d 0 0 cm /image Do Q\n" % (
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int(width * 72.0 / resolution),
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int(height * 72.0 / resolution)))
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xref.append(fp.tell())
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_obj(fp, pageNumber*3+5, Length=len(op.fp.getvalue()))
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fp.write("stream\n")
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fp.fp.write(op.fp.getvalue())
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fp.write("\nendstream\n")
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_endobj(fp)
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#
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# trailer
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@ -232,6 +250,7 @@ def _save(im, fp, filename):
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# --------------------------------------------------------------------
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Image.register_save("PDF", _save)
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Image.register_save_all("PDF", _save_all)
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Image.register_extension("PDF", ".pdf")
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@ -1,17 +1,20 @@
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from helper import unittest, PillowTestCase, hopper
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from PIL import Image
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import os.path
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class TestFilePdf(PillowTestCase):
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def helper_save_as_pdf(self, mode):
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def helper_save_as_pdf(self, mode, save_all=False):
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# Arrange
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im = hopper(mode)
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outfile = self.tempfile("temp_" + mode + ".pdf")
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# Act
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im.save(outfile)
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if save_all:
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im.save(outfile, save_all=True)
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else:
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im.save(outfile)
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# Assert
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self.assertTrue(os.path.isfile(outfile))
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@ -58,6 +61,19 @@ class TestFilePdf(PillowTestCase):
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self.assertRaises(ValueError, lambda: im.save(outfile))
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def test_save_all(self):
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# Single frame image
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self.helper_save_as_pdf("RGB", save_all=True)
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# Multiframe image
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im = Image.open("Tests/images/dispose_bgnd.gif")
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outfile = self.tempfile('temp.pdf')
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im.save(outfile, save_all=True)
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self.assertTrue(os.path.isfile(outfile))
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self.assertGreater(os.path.getsize(outfile), 0)
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if __name__ == '__main__':
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unittest.main()
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