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#!/usr/bin/env python
'''
Simple example of watermarking using form xobjects (pdfrw).
usage: watermark.py [-u] my.pdf single_page.pdf
Creates watermark.my.pdf, with every page overlaid with
first page from single_page.pdf. If -u is selected, watermark
will be placed underneath page (painted first).
NB: At one point, this example was extremely complicated, with
multiple options. That only led to errors in implementation,
so it has been re-simplified in order to show basic principles
of the library operation and to match the other examples better.
'''
import sys
import os
from pdfrw import PdfReader, PdfWriter, PageMerge
argv = sys.argv[1:]
underneath = '-u' in argv
if underneath:
del argv[argv.index('-u')]
inpfn, wmarkfn = argv
outfn = 'watermark.' + os.path.basename(inpfn)
wmark = PageMerge().add(PdfReader(wmarkfn).pages[0])[0]
trailer = PdfReader(inpfn)
for page in trailer.pages:
PageMerge(page).add(wmark, prepend=underneath).render()
PdfWriter().write(outfn, trailer)
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