forked from josch/img2pdf
Add support for pikepdf
This commit is contained in:
parent
65d9aed630
commit
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GPG key ID:
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4 changed files with 144 additions and 93 deletions
1
setup.py
1
setup.py
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@ -5,6 +5,7 @@ VERSION = "0.3.6"
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INSTALL_REQUIRES = (
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'Pillow',
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'pikepdf',
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)
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TESTS_REQUIRE = (
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224
src/img2pdf.py
224
src/img2pdf.py
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@ -40,6 +40,12 @@ try:
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except ImportError:
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have_pdfrw = False
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have_pikepdf = True
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try:
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import pikepdf
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except ImportError:
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have_pikepdf = False
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__version__ = "0.3.6"
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default_dpi = 96.0
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papersizes = {
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@ -483,13 +489,12 @@ class MyPdfArray(list):
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class MyPdfWriter:
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def __init__(self, version="1.3"):
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def __init__(self):
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self.objects = []
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# create an incomplete pages object so that a /Parent entry can be
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# added to each page
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self.pages = MyPdfDict(Type=MyPdfName.Pages, Kids=[], Count=0)
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self.catalog = MyPdfDict(Pages=self.pages, Type=MyPdfName.Catalog)
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self.version = version # default pdf version 1.3
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self.pagearray = []
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def addobj(self, obj):
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@ -497,7 +502,7 @@ class MyPdfWriter:
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obj.identifier = newid
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self.objects.append(obj)
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def tostream(self, info, stream):
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def tostream(self, info, stream, version="1.3"):
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xreftable = list()
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# justification of the random binary garbage in the header from
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@ -514,7 +519,7 @@ class MyPdfWriter:
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#
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# the choice of binary characters is arbitrary but those four seem to
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# be used elsewhere.
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pdfheader = ("%%PDF-%s\n" % self.version).encode("ascii")
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pdfheader = ("%%PDF-%s\n" % version).encode("ascii")
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pdfheader += b"%\xe2\xe3\xcf\xd3\n"
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stream.write(pdfheader)
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@ -616,12 +621,18 @@ class pdfdoc(object):
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fullscreen=False,
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):
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if engine is None:
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if have_pdfrw:
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if have_pikepdf:
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engine = Engine.pdfrw
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elif have_pdfrw:
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engine = Engine.pdfrw
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else:
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engine = Engine.internal
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if engine == Engine.pdfrw:
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if engine == Engine.pikepdf:
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PdfWriter = pikepdf.new
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PdfDict = pikepdf.Dictionary
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PdfName = pikepdf.Name
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elif engine == Engine.pdfrw:
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from pdfrw import PdfWriter, PdfDict, PdfName, PdfString
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elif engine == Engine.internal:
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PdfWriter = MyPdfWriter
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@ -631,49 +642,45 @@ class pdfdoc(object):
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else:
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raise ValueError("unknown engine: %s" % engine)
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now = datetime.now()
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self.info = PdfDict(indirect=True)
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self.writer = PdfWriter()
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if engine != Engine.pikepdf:
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self.writer.docinfo = PdfDict(indirect=True)
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def datetime_to_pdfdate(dt):
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return dt.strftime("%Y%m%d%H%M%SZ")
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if title is not None:
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self.info[PdfName.Title] = PdfString.encode(title)
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if author is not None:
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self.info[PdfName.Author] = PdfString.encode(author)
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if creator is not None:
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self.info[PdfName.Creator] = PdfString.encode(creator)
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if producer is not None and producer != "":
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self.info[PdfName.Producer] = PdfString.encode(producer)
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if creationdate is not None:
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self.info[PdfName.CreationDate] = PdfString.encode(
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"D:" + datetime_to_pdfdate(creationdate)
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)
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elif not nodate:
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self.info[PdfName.CreationDate] = PdfString.encode(
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"D:" + datetime_to_pdfdate(now)
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)
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if moddate is not None:
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self.info[PdfName.ModDate] = PdfString.encode(
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"D:" + datetime_to_pdfdate(moddate)
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)
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elif not nodate:
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self.info[PdfName.ModDate] = PdfString.encode(
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"D:" + datetime_to_pdfdate(now)
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)
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if subject is not None:
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self.info[PdfName.Subject] = PdfString.encode(subject)
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if keywords is not None:
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self.info[PdfName.Keywords] = PdfString.encode(",".join(keywords))
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for k in ["Title", "Author", "Creator", "Producer", "Subject"]:
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v = locals()[k.lower()]
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if v is None or v == "":
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continue
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if engine != Engine.pikepdf:
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v = PdfString.encode(v)
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self.writer.docinfo[getattr(PdfName,k)] = v
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self.writer = PdfWriter()
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self.writer.version = version
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# this is done because pdfrw adds info, catalog and pages as the first
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# three objects in this order
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if engine == Engine.internal:
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self.writer.addobj(self.info)
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self.writer.addobj(self.writer.catalog)
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self.writer.addobj(self.writer.pages)
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now = datetime.now()
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for k in ["CreationDate", "ModDate"]:
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v = locals()[k.lower()]
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if v is None and nodate:
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continue
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if v is None:
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v = now
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v = ("D:" + datetime_to_pdfdate(v)).encode("ascii")
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self.writer.docinfo[getattr(PdfName, k)] = v
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if keywords is not None:
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if engine == Engine.pikepdf:
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self.writer.docinfo[PdfName.Keywords] = ",".join(keywords)
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else:
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self.writer.docinfo[PdfName.Keywords] = PdfString.encode(
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",".join(keywords)
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)
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if engine != Engine.pikepdf:
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# this is done because pdfrw adds info, catalog and pages as the first
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# three objects in this order
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if engine == Engine.internal:
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self.writer.addobj(self.writer.docinfo)
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self.writer.addobj(self.writer.catalog)
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self.writer.addobj(self.writer.pages)
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self.panes = panes
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self.initial_page = initial_page
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@ -683,6 +690,7 @@ class pdfdoc(object):
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self.center_window = center_window
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self.fullscreen = fullscreen
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self.engine = engine
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self.output_version = version
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def add_imagepage(
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self,
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@ -707,9 +715,14 @@ class pdfdoc(object):
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trimborder=None,
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artborder=None,
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):
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if self.engine == Engine.pdfrw:
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if self.engine == Engine.pikepdf:
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PdfArray = pikepdf.Array
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PdfDict = pikepdf.Dictionary
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PdfName = pikepdf.Name
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elif self.engine == Engine.pdfrw:
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from pdfrw import PdfDict, PdfName, PdfObject, PdfString
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from pdfrw.py23_diffs import convert_load
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elif self.engine == Engine.internal:
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PdfDict = MyPdfDict
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PdfName = MyPdfName
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@ -718,6 +731,8 @@ class pdfdoc(object):
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convert_load = my_convert_load
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else:
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raise ValueError("unknown engine: %s" % self.engine)
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TrueObject = True if self.engine == Engine.pikepdf else PdfObject("true")
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FalseObject = False if self.engine == Engine.pikepdf else PdfObject("false")
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if color == Colorspace["1"] or color == Colorspace.L:
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colorspace = PdfName.DeviceGray
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@ -727,16 +742,27 @@ class pdfdoc(object):
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colorspace = PdfName.DeviceCMYK
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elif color == Colorspace.P:
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if self.engine == Engine.pdfrw:
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# https://github.com/pmaupin/pdfrw/issues/128
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# https://github.com/pmaupin/pdfrw/issues/147
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raise Exception(
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"pdfrw does not support hex strings for "
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"palette image input, re-run with "
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"--engine=internal"
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"--engine=internal or --engine=pikepdf"
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)
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assert len(palette) % 3 == 0
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colorspace = [
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PdfName.Indexed,
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PdfName.DeviceRGB,
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len(palette) - 1,
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PdfString.encode(palette, hextype=True),
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(len(palette) // 3) - 1,
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bytes(palette)
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if self.engine == Engine.pikepdf
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else PdfString.encode(
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[
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int.from_bytes(palette[i : i + 3], "big")
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for i in range(0, len(palette), 3)
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],
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hextype=True,
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),
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]
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else:
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raise UnsupportedColorspaceError("unsupported color space: %s" % color.name)
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@ -746,13 +772,16 @@ class pdfdoc(object):
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ofilter = PdfName.DCTDecode
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elif imgformat is ImageFormat.JPEG2000:
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ofilter = PdfName.JPXDecode
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self.writer.version = "1.5" # jpeg2000 needs pdf 1.5
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self.output_version = "1.5" # jpeg2000 needs pdf 1.5
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elif imgformat is ImageFormat.CCITTGroup4:
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ofilter = [PdfName.CCITTFaxDecode]
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else:
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ofilter = PdfName.FlateDecode
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image = PdfDict(stream=convert_load(imgdata))
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if self.engine == Engine.pikepdf:
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image = self.writer.make_stream(imgdata)
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else:
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image = PdfDict(stream=convert_load(imgdata))
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image[PdfName.Type] = PdfName.XObject
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image[PdfName.Subtype] = PdfName.Image
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@ -764,7 +793,7 @@ class pdfdoc(object):
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if color == Colorspace["CMYK;I"]:
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# Inverts all four channels
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image[PdfName.Decode] = [1.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 0.0]
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image[PdfName.Decode] = [1, 0, 1, 0, 1, 0, 1, 0]
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if imgformat is ImageFormat.CCITTGroup4:
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decodeparms = PdfDict()
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@ -772,9 +801,9 @@ class pdfdoc(object):
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# encoding. We set it to -1 because we want Group 4 encoding.
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decodeparms[PdfName.K] = -1
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if inverted:
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decodeparms[PdfName.BlackIs1] = PdfObject("false")
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decodeparms[PdfName.BlackIs1] = FalseObject
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else:
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decodeparms[PdfName.BlackIs1] = PdfObject("true")
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decodeparms[PdfName.BlackIs1] = TrueObject
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decodeparms[PdfName.Columns] = imgwidthpx
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decodeparms[PdfName.Rows] = imgheightpx
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image[PdfName.DecodeParms] = [decodeparms]
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@ -794,12 +823,18 @@ class pdfdoc(object):
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% (imgwidthpdf, imgheightpdf, imgxpdf, imgypdf)
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).encode("ascii")
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content = PdfDict(stream=convert_load(text))
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if self.engine == Engine.pikepdf:
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content = self.writer.make_stream(text)
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else:
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content = PdfDict(stream=convert_load(text))
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resources = PdfDict(XObject=PdfDict(Im0=image))
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page = PdfDict(indirect=True)
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page[PdfName.Type] = PdfName.Page
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page[PdfName.MediaBox] = [0, 0, pagewidth, pageheight]
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if self.engine == Engine.pikepdf:
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page = self.writer.add_blank_page(page_size=(pagewidth, pageheight))
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else:
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page = PdfDict(indirect=True)
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page[PdfName.Type] = PdfName.Page
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page[PdfName.MediaBox] = [0, 0, pagewidth, pageheight]
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# 14.11.2 Page Boundaries
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# ...
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# The crop, bleed, trim, and art boxes shall not ordinarily extend
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@ -848,15 +883,16 @@ class pdfdoc(object):
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page[PdfName.Rotate] = rotate
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if userunit is not None:
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# /UserUnit requires PDF 1.6
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if self.writer.version < "1.6":
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self.writer.version = "1.6"
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if self.output_version < "1.6":
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self.output_version = "1.6"
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page[PdfName.UserUnit] = userunit
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self.writer.addpage(page)
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if self.engine != Engine.pikepdf:
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self.writer.addpage(page)
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if self.engine == Engine.internal:
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self.writer.addobj(content)
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self.writer.addobj(image)
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if self.engine == Engine.internal:
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self.writer.addobj(content)
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self.writer.addobj(image)
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def tostring(self):
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stream = BytesIO()
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@ -864,8 +900,13 @@ class pdfdoc(object):
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return stream.getvalue()
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def tostream(self, outputstream):
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if self.engine == Engine.pdfrw:
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if self.engine == Engine.pikepdf:
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PdfArray = pikepdf.Array
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PdfDict = pikepdf.Dictionary
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PdfName = pikepdf.Name
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elif self.engine == Engine.pdfrw:
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from pdfrw import PdfDict, PdfName, PdfArray, PdfObject
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elif self.engine == Engine.internal:
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PdfDict = MyPdfDict
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PdfName = MyPdfName
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@ -873,8 +914,8 @@ class pdfdoc(object):
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PdfArray = MyPdfArray
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else:
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raise ValueError("unknown engine: %s" % self.engine)
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NullObject = PdfObject("null")
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TrueObject = PdfObject("true")
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NullObject = None if self.engine == Engine.pikepdf else PdfObject("null")
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TrueObject = True if self.engine == Engine.pikepdf else PdfObject("true")
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# We fill the catalog with more information like /ViewerPreferences,
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# /PageMode, /PageLayout or /OpenAction because the latter refers to a
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@ -884,7 +925,9 @@ class pdfdoc(object):
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# is added, so we can only start using it after all pages have been
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# written.
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if self.engine == Engine.pdfrw:
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if self.engine == Engine.pikepdf:
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catalog = self.writer.Root
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elif self.engine == Engine.pdfrw:
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catalog = self.writer.trailer.Root
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elif self.engine == Engine.internal:
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catalog = self.writer.catalog
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@ -945,13 +988,19 @@ class pdfdoc(object):
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# FitBV - Fits the height of the page bounding box to the window.
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# by default the initial page is the first one
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initial_page = self.writer.pagearray[0]
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if self.engine == Engine.pikepdf:
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initial_page = self.writer.pages[0]
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else:
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initial_page = self.writer.pagearray[0]
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# we set the open action here to make sure we open on the requested
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# initial page but this value might be overwritten by a custom open
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# action later while still taking the requested initial page into
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# account
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if self.initial_page is not None:
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initial_page = self.writer.pagearray[self.initial_page - 1]
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if self.engine == Engine.pikepdf:
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initial_page = self.writer.pages[self.initial_page - 1]
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else:
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initial_page = self.writer.pagearray[self.initial_page - 1]
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catalog[PdfName.OpenAction] = PdfArray(
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[initial_page, PdfName.XYZ, NullObject, NullObject, 0]
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)
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@ -992,11 +1041,16 @@ class pdfdoc(object):
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raise ValueError("unknown page layout: %s" % self.page_layout)
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# now write out the PDF
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if self.engine == Engine.pdfrw:
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self.writer.trailer.Info = self.info
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if self.engine == Engine.pikepdf:
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self.writer.save(outputstream, min_version=self.output_version, linearize=True)
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elif self.engine == Engine.pdfrw:
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self.writer.trailer.Info = self.writer.docinfo
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# setting the version attribute of the pdfrw PdfWriter object will
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# influence the behaviour of the write() function
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self.writer.version = self.output_version
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self.writer.write(outputstream)
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elif self.engine == Engine.internal:
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self.writer.tostream(self.info, outputstream)
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self.writer.tostream(self.writer.docinfo, outputstream, self.output_version)
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else:
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raise ValueError("unknown engine: %s" % self.engine)
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@ -1170,7 +1224,7 @@ def transcode_monochrome(imgdata):
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def parse_png(rawdata):
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pngidat = b""
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palette = []
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palette = b""
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i = 16
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while i < len(rawdata):
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# once we can require Python >= 3.2 we can use int.from_bytes() instead
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@ -1180,20 +1234,7 @@ def parse_png(rawdata):
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if rawdata[i - 4 : i] == b"IDAT":
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pngidat += rawdata[i : i + n]
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elif rawdata[i - 4 : i] == b"PLTE":
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# This could be as simple as saying "palette = rawdata[i:i+n]" but
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# pdfrw does only escape parenthesis and backslashes in the raw
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# byte stream. But raw carriage return bytes are interpreted as
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# line feed bytes by ghostscript. So instead we use the hex string
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# format. pdfrw cannot write it but at least ghostscript is happy
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# with it. We would also write out the palette in binary format
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# (and escape more bytes) but since we cannot use pdfrw anyways,
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# we choose the more human readable variant.
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# See https://github.com/pmaupin/pdfrw/issues/147
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for j in range(i, i + n, 3):
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# with int.from_bytes() we would not have to prepend extra
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# zeroes
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color, = struct.unpack(">I", b"\x00" + rawdata[j : j + 3])
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palette.append(color)
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palette += rawdata[i : i + n]
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i += n
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i += 12
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return pngidat, palette
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@ -3119,9 +3160,12 @@ RGB.""",
|
|||
"--engine",
|
||||
metavar="engine",
|
||||
type=parse_enginearg,
|
||||
help="Choose PDF engine. Can be either internal or pdfrw. The "
|
||||
"internal engine does not have additional requirements and writes out "
|
||||
"a human readable PDF. The pdfrw engine requires the pdfrw Python "
|
||||
help="Choose PDF engine. Can be either internal, pikepdf or pdfrw. "
|
||||
"The internal engine does not have additional requirements and writes "
|
||||
"out a human readable PDF. The pikepdf engine requires the pikepdf "
|
||||
"Python module and qpdf library, is most featureful, can "
|
||||
"linearize PDFs (\"fast web view\") and can compress more parts of it."
|
||||
"The pdfrw engine requires the pdfrw Python "
|
||||
"module but does not support unicode metadata (See "
|
||||
"https://github.com/pmaupin/pdfrw/issues/39) or palette data (See "
|
||||
"https://github.com/pmaupin/pdfrw/issues/128).",
|
||||
|
|
|
|||
|
|
@ -476,7 +476,7 @@ def test_suite():
|
|||
setattr(TestImg2Pdf, "test_layout_%03d_im2" % i, layout_handler_im2)
|
||||
|
||||
files = os.listdir(os.path.join(HERE, "input"))
|
||||
for engine, test_name in [(a, b) for a in [img2pdf.Engine.internal, img2pdf.Engine.pdfrw]
|
||||
for engine, test_name in [(a, b) for a in [img2pdf.Engine.internal, img2pdf.Engine.pdfrw, img2pdf.Engine.pikepdf]
|
||||
for b in files]:
|
||||
inputf = os.path.join(HERE, "input", test_name)
|
||||
if not os.path.isfile(inputf):
|
||||
|
|
@ -546,8 +546,9 @@ def test_suite():
|
|||
{"/XObject"})
|
||||
self.assertEqual(cur_page.Resources.XObject.keys(),
|
||||
{"/Im0"})
|
||||
self.assertEqual(cur_page.Contents.Length,
|
||||
len(cur_page.Contents.read_bytes()))
|
||||
if engine != img2pdf.Engine.pikepdf:
|
||||
self.assertEqual(cur_page.Contents.Length,
|
||||
len(cur_page.Contents.read_bytes()))
|
||||
self.assertEqual(cur_page.Contents.read_bytes(),
|
||||
b"q\n%.4f 0 0 %.4f 0.0000 0.0000 cm\n"
|
||||
b"/Im0 Do\nQ" % (pagewidth, pageheight))
|
||||
|
|
@ -666,6 +667,8 @@ def test_suite():
|
|||
pass
|
||||
if engine == img2pdf.Engine.internal:
|
||||
setattr(TestImg2Pdf, "test_%s_internal" % test_name, handle)
|
||||
elif engine == img2pdf.Engine.pikepdf:
|
||||
setattr(TestImg2Pdf, "test_%s_pikepdf" % test_name, handle)
|
||||
elif engine == img2pdf.Engine.pdfrw:
|
||||
setattr(TestImg2Pdf, "test_%s_pdfrw" % test_name, handle)
|
||||
else:
|
||||
|
|
|
|||
3
test.sh
3
test.sh
|
|
@ -137,6 +137,9 @@ available_engines="internal"
|
|||
if python3 -c "import pdfrw" 2>/dev/null; then
|
||||
available_engines="$available_engines pdfrw"
|
||||
fi
|
||||
if python3 -c "import pikepdf" 2>/dev/null; then
|
||||
available_engines="$available_engines pikepdf"
|
||||
fi
|
||||
|
||||
img2pdf()
|
||||
{
|
||||
|
|
|
|||
Loading…
Reference in a new issue