#?-*-?coding:?utf-8?-*-

#?去除原PDF文件中的水印，可從簡書下載
#?OpenCV?3.x?with?Python?By?Example?2nd
#?https://www.jianshu.com/p/a4d306dc3b5b

#?Remove?watermark?with?PyPDF2
#?http://blog.uorz.me/2018/06/19/removeing-watermark-with-PyPDF2.html

#?Goshin/Remove-PDF-Watermark
#?https://github.com/Goshin/Remove-PDF-Watermark

from?PyPDF2?import?PdfFileMerger
from?PyPDF2.pdf?import?ContentStream
from?PyPDF2.utils?import?b_
from?PyPDF2.generic?import?Nameobject?Numberobject
import?numpy?as?np

import?argparse
import?logging

class?PdfFileModifyMerger（PdfFileMerger）:

????#?書簽向前差了一頁，退回原位
????def?bookmarks_plus_one（self?bookmarks=None）:
????????if?bookmarks?==?None:
????????????bookmarks?=?self.bookmarks

????????for?b?in?bookmarks:
????????????if?isinstance（b?list）:
????????????????self.bookmarks_plus_one（b）
????????????????continue

????????????bp?=?b[‘/Page‘]

????????????if?isinstance（bp?Numberobject）:
????????????????#b[‘/Page‘]?=?Numberobject（bp.as_numeric（）?-?1）
????????????????b.__setitem__（Nameobject（‘/Page‘）?Numberobject（bp.as_numeric（）?-?1））
????????????????continue

????def?merge（self?*args?after_page_append=[]?**kwargs）:
????????super（PdfFileModifyMerger?self）.merge（*args?**kwargs）

????????pdfr?=?self.inputs[-1][1]

????????position?=?args[0]
????????pages?=?kwargs.get（‘pages‘?None）
????????if?pages?is?None:
????????????pages?=?（0?pdfr.getNumPages（））
????????elif?isinstance（pages?PageRange）:
????????????pages?=?pages.indices（pdfr.getNumPages（））
????????elif?not?isinstance（pages?tuple）:
????????????raise?TypeError（‘“pages“?must?be?a?tuple?of?（start?stop[?step]）‘）

???????