mirror of
https://github.com/Llewellynvdm/pdflayers.git
synced 2024-11-16 01:07:08 +00:00
26e1f6a543
Shouldn't have any issues with excpetions anymore at least. Need to read the PDF reference manual properly to see if this is the right thing to do... Fixes #2
94 lines
2.6 KiB
Python
94 lines
2.6 KiB
Python
#!/usr/bin/env python3
|
|
"""Script for editing PDF to change layer (OCG) visibility.
|
|
|
|
The output should display correctly in the PDF viwer in google-chrome,
|
|
evince, okular, and Adobe Reader (with JavaScript disabled).
|
|
|
|
pdf.js in firefox might not work: https://github.com/mozilla/pdf.js/issues/4841
|
|
|
|
Requirements:
|
|
Install pikepdf:
|
|
pip3 install --user pikepdf
|
|
and run the script with python3.
|
|
|
|
References:
|
|
https://www.adobe.com/content/dam/acom/en/devnet/pdf/pdf_reference_archive/PDFReference16.pdf
|
|
https://pikepdf.readthedocs.io/
|
|
"""
|
|
import argparse
|
|
import logging
|
|
import sys
|
|
|
|
import pikepdf
|
|
|
|
|
|
def set_layer_visibility(pdf, layers_to_show):
|
|
"""Set visibility of layers."""
|
|
try:
|
|
ocgs = pdf.root.OCProperties.OCGs
|
|
except (AttributeError, KeyError):
|
|
logging.error("Unable to locate layers in PDF.")
|
|
sys.exit(1)
|
|
|
|
ocgs_on = []
|
|
for ocg in ocgs:
|
|
if ocg.Name in layers_to_show:
|
|
logging.info("Layer %s will be visible.", ocg.Name)
|
|
ocgs_on.append(ocg)
|
|
else:
|
|
logging.info("Layer %s will be hidden.", ocg.Name)
|
|
|
|
ocgs_config = pikepdf.Dictionary(
|
|
BaseState=pikepdf.Name('/OFF'),
|
|
ON=ocgs_on,
|
|
Order=ocgs,
|
|
)
|
|
|
|
pdf.root.OCProperties = pikepdf.Dictionary(
|
|
D=ocgs_config,
|
|
OCGs=ocgs,
|
|
)
|
|
|
|
# Needed for the PDF viwer in google-chrome (at least):
|
|
for ocg in ocgs:
|
|
if '/View' in ocg.Usage:
|
|
del ocg.Usage.View
|
|
if '/Print' in ocg.Usage:
|
|
del ocg.Usage.Print
|
|
|
|
|
|
def main():
|
|
"""Main."""
|
|
logging.basicConfig(level=logging.INFO)
|
|
parser = argparse.ArgumentParser(
|
|
description='Tool for changing default visibility of PDF layers.'
|
|
)
|
|
parser.add_argument('input',
|
|
help='input file')
|
|
parser.add_argument('output',
|
|
help='output file')
|
|
parser.add_argument('--password', default='',
|
|
help='user password (for encrypted files)')
|
|
parser.add_argument('--show', nargs='+', default=(),
|
|
help='layers to be visible in output')
|
|
parser.add_argument('--qdf', action='store_true',
|
|
help='Use qdf to save the output. (Debug option)')
|
|
args = parser.parse_args()
|
|
|
|
pdf = pikepdf.open(args.input, password=args.password)
|
|
|
|
set_layer_visibility(pdf, args.show)
|
|
pdf.remove_unreferenced_resources()
|
|
|
|
save_options = {
|
|
'compress_streams': False,
|
|
'qdf': True,
|
|
} if args.qdf else {
|
|
}
|
|
|
|
pdf.save(args.output, **save_options)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|