forked from josch/img2pdf
major refactoring
This commit is contained in:
josch
parent
50aff1474f
commit
46a510d2b9
1 changed files with 158 additions and 138 deletions
226
img2pdf.py
226
img2pdf.py
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@ -29,7 +29,7 @@ def parse(cont, indent=1):
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elif type(cont) is int or type(cont) is float:
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return str(cont)
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elif isinstance(cont, obj):
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return "%d 0 R"%cont.get_identifier()
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return "%d 0 R"%cont.identifier
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elif type(cont) is str:
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return cont
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elif type(cont) is list:
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@ -40,34 +40,20 @@ class obj():
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self.content = content
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self.stream = stream
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def tostring(self, identifier):
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self.identifier = identifier
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def tostring(self):
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if self.stream:
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return "%d 0 obj "%identifier+parse(self.content)+"\nstream\n"+self.stream+"\nendstream\nendobj\n"
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return "%d 0 obj "%self.identifier+parse(self.content)+"\nstream\n"+self.stream+"\nendstream\nendobj\n"
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else:
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return "%d 0 obj "%identifier+parse(self.content)+" endobj\n"
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return "%d 0 obj "%self.identifier+parse(self.content)+" endobj\n"
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def get_identifier(self):
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if not hasattr(self, 'identifier'):
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raise Exception("no id set yet, call tostring() on obj first")
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return self.identifier
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def main(images, dpi, title=None, author=None, creator=None, producer=None,
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creationdate=None, moddate=None, subject=None, keywords=None,
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colorspace=None, verbose=False):
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version = 3 # default pdf version 1.3
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class pdfdoc():
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objects = list()
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def __init__(self, version=3, title=None, author=None, creator=None, producer=None,
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creationdate=None, moddate=None, subject=None, keywords=None):
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self.version = version # default pdf version 1.3
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now = datetime.now()
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def debug_out(message):
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if verbose:
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sys.stderr.write("D: "+message+"\n")
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def error_out(message):
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sys.stderr.write("E: "+message+"\n")
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def warning_out(message):
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sys.stderr.write("W: "+message+"\n")
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info = dict()
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if title:
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info["/Title"] = "("+title+")"
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@ -90,67 +76,37 @@ def main(images, dpi, title=None, author=None, creator=None, producer=None,
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if keywords:
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info["/Keywords"] = "("+",".join(keywords)+")"
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info = obj(info)
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pagestuples = list()
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self.info = obj(info)
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# create an incomplete pages object so that a /Parent entry can be added to each page
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pages = obj({
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"/Type": "/Pages"
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self.pages = obj({
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"/Type": "/Pages",
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"/Kids": [],
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"/Count": 0
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})
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for im in images:
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rawdata = im.read()
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im.seek(0)
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try:
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imgdata = Image.open(im)
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except IOError as e:
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# test if it is a jpeg2000 image
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if rawdata[:12] != "\x00\x00\x00\x0C\x6A\x50\x20\x20\x0D\x0A\x87\x0A":
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error_out("cannot read input image (not jpeg2000)")
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error_out("PIL: %s"%e)
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exit(1)
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# image is jpeg2000
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width, height, ics = parsejp2(rawdata)
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imgformat = "JP2"
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if colorspace:
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color = colorspace
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else:
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color = ics
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debug_out("input colorspace = %s"%(ics))
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if dpi:
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dpi_x, dpi_y = dpi, dpi
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else:
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dpi_x, dpi_y = (96, 96) # TODO: read real dpi
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else:
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width, height = imgdata.size
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if dpi:
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dpi_x, dpi_y = dpi, dpi
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else:
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dpi_x, dpi_y = imgdata.info.get("dpi", (96, 96))
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debug_out("input dpi = %d x %d"%(dpi_x,dpi_y))
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imgformat = imgdata.format
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if colorspace:
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color = colorspace
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else:
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color = imgdata.mode
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debug_out("input colorspace = %s"%(color))
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self.catalog = obj({
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"/Pages": self.pages,
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"/Type": "/Catalog"
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})
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self.addobj(self.catalog)
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self.addobj(self.pages)
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debug_out("width x height = %d x %d"%(width,height))
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def addobj(self, obj):
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newid = len(self.objects)+1
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obj.identifier = newid
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self.objects.append(obj)
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def addimage(self, color, width, height, dpi, imgformat, imgdata):
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if color == 'L':
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color = "/DeviceGray"
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elif color == 'RGB':
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color = "/DeviceRGB"
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elif color == '1':
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# TODO: /CCITTFaxDecode monochrome images
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imgdata = imgdata.convert('L')
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color = "/DeviceGray"
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else:
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error_out("unsupported color space: %s"%color)
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exit(1)
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pdf_x, pdf_y = 72.0*width/dpi_x, 72.0*height/dpi_y # pdf units = 1/72 inch
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pdf_x, pdf_y = 72.0*width/dpi[0], 72.0*height/dpi[1] # pdf units = 1/72 inch
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if pdf_x < 3.00 or pdf_y < 3.00:
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warning_out("pdf width or height is below 3.00 - decrease the dpi")
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@ -158,16 +114,11 @@ def main(images, dpi, title=None, author=None, creator=None, producer=None,
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# either embed the whole jpeg or deflate the bitmap representation
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if imgformat is "JPEG":
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ofilter = [ "/DCTDecode" ]
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imgdata = rawdata
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elif imgformat is "JP2":
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ofilter = [ "/JPXDecode" ]
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imgdata = rawdata
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version = 5 # jpeg2000 needs pdf 1.5
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self.version = 5 # jpeg2000 needs pdf 1.5
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else:
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ofilter = [ "/FlateDecode" ]
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imgdata = zlib.compress(imgdata.tostring())
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im.close()
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image = obj({
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"/Type": "/XObject",
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"/Subtype": "/Image",
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@ -187,7 +138,7 @@ def main(images, dpi, title=None, author=None, creator=None, producer=None,
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page = obj({
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"/Type": "/Page",
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"/Parent": pages,
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"/Parent": self.pages,
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"/Resources": {
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"/XObject": {
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"/Im0": image
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@ -196,37 +147,24 @@ def main(images, dpi, title=None, author=None, creator=None, producer=None,
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"/MediaBox": [0, 0, pdf_x, pdf_y],
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"/Contents": content
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})
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self.pages.content["/Kids"].append(page)
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self.pages.content["/Count"] += 1
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self.addobj(page)
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self.addobj(content)
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self.addobj(image)
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pagestuples.append((image, content, page))
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# complete pages object with page information
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pages.content["/Kids"] = [ pagetuple[2] for pagetuple in pagestuples ]
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pages.content["/Count"] = len(pagestuples)
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catalog = obj({
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"/Pages": pages,
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"/Type": "/Catalog"
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})
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objects = list()
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objects.append(info.tostring(3*(len(pagestuples)+1)))
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pages.identifier = 2 # manually set it because each page references to it
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for i, (image, content, page) in enumerate(reversed(pagestuples)):
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objects.append(image.tostring(3*(len(pagestuples)-i+1)-1))
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objects.append(content.tostring(3*(len(pagestuples)-i+1)-2))
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objects.append(page.tostring(3*(len(pagestuples)-i+1)-3))
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objects.append(pages.tostring(2))
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objects.append(catalog.tostring(1))
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objects.reverse()
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def tostring(self):
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# add info as last object
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self.addobj(self.info)
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xreftable = list()
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result = "%%PDF-1.%d\n"%version
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result = "%%PDF-1.%d\n"%self.version
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xreftable.append("0000000000 65535 f \n")
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for o in objects:
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for o in self.objects:
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xreftable.append("%010d 00000 n \n"%len(result))
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result += o
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result += o.tostring()
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xrefoffset = len(result)
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result += "xref\n"
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@ -234,13 +172,95 @@ def main(images, dpi, title=None, author=None, creator=None, producer=None,
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for x in xreftable:
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result += x
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result += "trailer\n"
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result += parse({"/Size": len(xreftable), "/Info": info, "/Root": catalog})+"\n"
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result += parse({"/Size": len(xreftable), "/Info": self.info, "/Root": self.catalog})+"\n"
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result += "startxref\n"
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result += "%d\n"%xrefoffset
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result += "%%EOF\n"
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return result
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def main(images, dpi, title=None, author=None, creator=None, producer=None,
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creationdate=None, moddate=None, subject=None, keywords=None,
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colorspace=None, verbose=False):
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def debug_out(message):
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if verbose:
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sys.stderr.write("D: "+message+"\n")
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def error_out(message):
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sys.stderr.write("E: "+message+"\n")
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def warning_out(message):
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sys.stderr.write("W: "+message+"\n")
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pdf = pdfdoc()
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for im in images:
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rawdata = im.read()
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im.seek(0)
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try:
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imgdata = Image.open(im)
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except IOError as e:
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# test if it is a jpeg2000 image
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if rawdata[:12] != "\x00\x00\x00\x0C\x6A\x50\x20\x20\x0D\x0A\x87\x0A":
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error_out("cannot read input image (not jpeg2000)")
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error_out("PIL: %s"%e)
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exit(1)
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# image is jpeg2000
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width, height, ics = parsejp2(rawdata)
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imgformat = "JP2"
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if dpi:
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dpi = dpi, dpi
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debug_out("input dpi (forced) = %d x %d"%dpi)
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else:
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dpi = (96, 96) # TODO: read real dpi
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debug_out("input dpi = %d x %d"%dpi)
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if colorspace:
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color = colorspace
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debug_out("input colorspace (forced) = %s"%(ics))
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else:
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color = ics
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debug_out("input colorspace = %s"%(ics))
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else:
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width, height = imgdata.size
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imgformat = imgdata.format
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if dpi:
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dpi = dpi, dpi
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debug_out("input dpi (forced) = %d x %d"%dpi)
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else:
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dpi = imgdata.info.get("dpi", (96, 96))
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debug_out("input dpi = %d x %d"%dpi)
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if colorspace:
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color = colorspace
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debug_out("input colorspace (forced) = %s"%(color))
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else:
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color = imgdata.mode
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debug_out("input colorspace = %s"%(color))
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debug_out("width x height = %d x %d"%(width,height))
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debug_out("imgformat = %s"%imgformat)
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# depending on the input format, determine whether to pass the raw
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# image or the zlib compressed color information
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if imgformat is "JPEG" or imgformat is "JP2":
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if color == '1':
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error_out("jpeg can't be monochrome")
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exit(1)
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imgdata = rawdata
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else:
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# because we do not support /CCITTFaxDecode
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if color == '1':
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imgdata = imgdata.convert('L')
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color = 'L'
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imgdata = zlib.compress(imgdata.tostring())
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pdf.addimage(color, width, height, dpi, imgformat, imgdata)
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im.close()
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return pdf.tostring()
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if __name__ == "__main__":
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parser = argparse.ArgumentParser(description='lossless conversion/embedding of images (in)to pdf')
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parser.add_argument('images', metavar='infile', type=argparse.FileType('rb'),
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