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Use jbig2enc jbig2topdf.py to create PDF files, as standalone JBIG2 images are now supported upstream

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RunasSudo 2024-11-16 19:16:40 +11:00
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COPYING.APACHE2
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4
README.md
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@ -4,7 +4,9 @@ GIMP 3.0 plug-in for exporting lossless JBIG2-encoded PDF files
## Usage ## Usage
file-jbig2pdf has only been tested on Linux. It requires [jbig2enc](https://github.com/agl/jbig2enc) to be installed, and its *jbig2* command to be available on PATH. file-jbig2pdf has only been tested on Linux. It requires [jbig2enc](https://github.com/agl/jbig2enc) to be installed, and its *jbig2* and *jbig2topdf.py* commands to be available on PATH.
**Important:** file-jbig2pdf requires *jbig2topdf.py* to have support for ‘standalone’ JBIG2 images, which was implemented in jbig2enc commit [bc9ec13](https://github.com/agl/jbig2enc/commit/bc9ec13d64657ff52dca79964acdc9ed1ff0ee30). At the time of writing (November 2024), this is available only in the git version of jbig2enc (e.g. Arch Linux [jbig2enc-git](https://aur.archlinux.org/packages/jbig2enc-git)).
Install *file-jbig2pdf.py* and *jbig2topdf_lossless.py* under *$HOME/.config/GIMP/3.0/plug-ins/file-jbig2pdf/* and ensure that *file-jbig2pdf.py* is executable. Install *file-jbig2pdf.py* and *jbig2topdf_lossless.py* under *$HOME/.config/GIMP/3.0/plug-ins/file-jbig2pdf/* and ensure that *file-jbig2pdf.py* is executable.

26
file-jbig2pdf.py
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@ -27,20 +27,21 @@ from gi.repository import GLib
from gi.repository import Gio from gi.repository import Gio
import os import os
import shutil
import subprocess import subprocess
import sys import sys
import tempfile import tempfile
import jbig2topdf_lossless
def export_jbig2pdf(procedure, run_mode, image, file, options, metadata, config, data): def export_jbig2pdf(procedure, run_mode, image, file, options, metadata, config, data):
# Check jbig2enc version # Check jbig2enc version
try: if shutil.which('jbig2') is None:
subprocess.run(['jbig2', '-V'])
except FileNotFoundError:
Gimp.message('jbig2 command (from jbig2enc) not in PATH') Gimp.message('jbig2 command (from jbig2enc) not in PATH')
return Gimp.ValueArray.new_from_values([GObject.Value(Gimp.PDBStatusType, Gimp.PDBStatusType.EXECUTION_ERROR)]) return Gimp.ValueArray.new_from_values([GObject.Value(Gimp.PDBStatusType, Gimp.PDBStatusType.EXECUTION_ERROR)])
if shutil.which('jbig2topdf.py') is None:
Gimp.message('jbig2topdf.py command (from jbig2enc) not in PATH')
return Gimp.ValueArray.new_from_values([GObject.Value(Gimp.PDBStatusType, Gimp.PDBStatusType.EXECUTION_ERROR)])
# jbig2enc OK! # jbig2enc OK!
Gimp.progress_init('Exporting PDF JBIG2 image') Gimp.progress_init('Exporting PDF JBIG2 image')
@ -97,7 +98,6 @@ def export_jbig2pdf(procedure, run_mode, image, file, options, metadata, config,
subprocess.run(['jbig2', '-p', '-v', png_out], cwd=tempdir, check=True, stdout=jb2_file) subprocess.run(['jbig2', '-p', '-v', png_out], cwd=tempdir, check=True, stdout=jb2_file)
except subprocess.CalledProcessError: except subprocess.CalledProcessError:
Gimp.message('Unknown error in jbig2enc') Gimp.message('Unknown error in jbig2enc')
os.rmdir(tempdir)
Gimp.progress_end() Gimp.progress_end()
return Gimp.ValueArray.new_from_values([GObject.Value(Gimp.PDBStatusType, Gimp.PDBStatusType.EXECUTION_ERROR)]) return Gimp.ValueArray.new_from_values([GObject.Value(Gimp.PDBStatusType, Gimp.PDBStatusType.EXECUTION_ERROR)])
@ -110,19 +110,13 @@ def export_jbig2pdf(procedure, run_mode, image, file, options, metadata, config,
try: try:
with open(pdf_tmpout, 'wb') as pdf_file: with open(pdf_tmpout, 'wb') as pdf_file:
# The Python script supplied with jbig2enc only supports lossy JBIG2 encoding (https://github.com/agl/jbig2enc/pull/77) subprocess.run(['jbig2topdf.py', '-s'] + jb2s_out, check=True, stdout=pdf_file)
# So therefore we bundle a modified script which works on lossless JBIG2 images
jbig2topdf_lossless.create_pdf(None, jb2s_out, pdf_file)
success = True success = True
except Exception: except subprocess.CalledProcessError:
success = False success = False
Gimp.message('Unknown error converting JBIG2 images to PDF') Gimp.message('Unknown error in jbig2topdf.py')
os.rmdir(tempdir)
Gimp.progress_end() Gimp.progress_end()
return Gimp.ValueArray.new_from_values([GObject.Value(Gimp.PDBStatusType, Gimp.PDBStatusType.EXECUTION_ERROR)]) return Gimp.ValueArray.new_from_values([GObject.Value(Gimp.PDBStatusType, Gimp.PDBStatusType.EXECUTION_ERROR)])
finally:
if not success:
os.unlink(pdf_tmpout)
# Success! - Finalise and clean up # Success! - Finalise and clean up
@ -164,7 +158,7 @@ class FileJBIG2PDF(Gimp.PlugIn):
procedure.set_attribution( procedure.set_attribution(
'Lee Yingtong Li (RunasSudo)', # Author 'Lee Yingtong Li (RunasSudo)', # Author
'Lee Yingtong Li (RunasSudo)', # Copyright 'Lee Yingtong Li (RunasSudo)', # Copyright
'Lee Yingtong Li (RunasSudo)' # Year '2024' # Year
) )
return procedure return procedure

234
jbig2topdf_lossless.py
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@ -1,234 +0,0 @@
#!/usr/bin/env python3
# GIMP plug-in for JBIG2-encoded PDF files
# Copyright (C) 2024 Lee Yingtong Li (RunasSudo)
#
# Adapted from jbig2enc by Adam Langley <agl@imperialviolet.org> - Copyright (C) 2006 Google Inc., licensed under Apache v2
# Loosely adapted from file-openraster.py - Copyright (C) 2009 by Jon Nordby <jononor@gmail.com>, licensed under the GPLv3
# In turn based on MyPaint source code by Martin Renold
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
import glob
import struct
import sys
from pathlib import Path
dpi = 72 # Default DPI value
class Ref:
def __init__(self, x: int):
self.x = x
def __str__(self) -> str:
return f"{self.x} 0 R"
class Dict:
def __init__(self, values: dict = None):
if values is None:
values = {}
self.d = values.copy()
def __str__(self) -> str:
entries = [f"/{key} {value}" for key, value in self.d.items()]
return f"<< {' '.join(entries)} >>\n"
class Obj:
next_id = 1
def __init__(self, d: dict = None, stream: str = None):
if d is None:
d = {}
if stream is not None:
d["Length"] = str(len(stream))
self.d = Dict(d)
self.stream = stream
self.id = Obj.next_id
Obj.next_id += 1
def __str__(self) -> str:
result = [str(self.d)]
if self.stream is not None:
result.append(f"stream\n{self.stream}\nendstream\n")
result.append("endobj\n")
return "".join(result)
class Doc:
def __init__(self):
self.objs = []
self.pages = []
def add_object(self, obj: Obj) -> Obj:
"""Adds an object to the document."""
self.objs.append(obj)
return obj
def add_page(self, page: Obj) -> Obj:
"""Adds a page to the document and the list of objects."""
self.pages.append(page)
return self.add_object(page)
def __str__(self) -> str:
output = []
offsets = []
current_offset = 0
def add_line(line: str):
nonlocal current_offset
output.append(line)
current_offset += len(line) + 1 # Adding 1 for the newline character
# PDF header
add_line("%PDF-1.4")
# Add each object and track its byte offset
for obj in self.objs:
offsets.append(current_offset)
add_line(f"{obj.id} 0 obj")
add_line(str(obj))
# Cross-reference table
xref_start = current_offset
add_line("xref")
add_line(f"0 {len(offsets) + 1}")
add_line("0000000000 65535 f ")
for offset in offsets:
add_line(f"{offset:010} 00000 n ")
# Trailer and EOF
add_line("trailer")
add_line(f"<< /Size {len(offsets) + 1}\n/Root 1 0 R >>")
add_line("startxref")
add_line(str(xref_start))
add_line("%%EOF")
return "\n".join(output)
def ref(x: int) -> str:
"""Creates a PDF reference string."""
return f"{x} 0 R"
def create_pdf(symboltable: str = "symboltable", pagefiles: list = None, outf = sys.stdout.buffer):
"""Creates a PDF document from a symbol table and a list of page files."""
if pagefiles is None:
pagefiles = glob.glob("page-*")
doc = Doc()
# Add catalog and outlines objects
catalog_obj = Obj({"Type": "/Catalog", "Outlines": ref(2), "Pages": ref(3)})
outlines_obj = Obj({"Type": "/Outlines", "Count": "0"})
pages_obj = Obj({"Type": "/Pages"})
doc.add_object(catalog_obj)
doc.add_object(outlines_obj)
doc.add_object(pages_obj)
# Read the symbol table
# RUNASSUDO: Remove this as unnecessary with lossless encoding
#try:
# with open(symboltable, "rb") as sym_file:
# symd = doc.add_object(Obj({}, sym_file.read().decode("latin1")))
#except IOError:
# sys.stderr.write(f"Error reading symbol table: {symboltable}\n")
# return
page_objs = []
pagefiles.sort()
for p in pagefiles:
try:
with open(p, mode="rb") as page_file:
contents = page_file.read()
except IOError:
sys.stderr.write(f"Error reading page file: {p}\n")
continue
try:
width, height, xres, yres = struct.unpack(">IIII", contents[11:27])
except struct.error:
sys.stderr.write(f"Error unpacking page file: {p}\n")
continue
# Set default resolution if missing
xres = xres or dpi
yres = yres or dpi
# Create XObject (image) for the page
xobj = Obj(
{
"Type": "/XObject",
"Subtype": "/Image",
"Width": str(width),
"Height": str(height),
"ColorSpace": "/DeviceGray",
"BitsPerComponent": "1",
"Filter": "/JBIG2Decode",
#"DecodeParms": f"<< /JBIG2Globals {symd.id} 0 R >>", # RUNASSUDO: Remove this as unnecessary with lossless encoding
},
contents.decode("latin1"),
)
# Create content stream for the page
contents_obj = Obj(
{},
f"q {float(width * 72) / xres} 0 0 {float(height * 72) / yres} 0 0 cm /Im1 Do Q",
)
# Create resource dictionary for the page
resources_obj = Obj(
{"ProcSet": "[/PDF /ImageB]", "XObject": f"<< /Im1 {xobj.id} 0 R >>"}
)
# Create the page object
page_obj = Obj(
{
"Type": "/Page",
"Parent": "3 0 R",
"MediaBox": f"[ 0 0 {float(width * 72) / xres} {float(height * 72) / yres} ]",
"Contents": ref(contents_obj.id),
"Resources": ref(resources_obj.id),
}
)
# Add objects to the document
for obj in (xobj, contents_obj, resources_obj, page_obj):
doc.add_object(obj)
page_objs.append(page_obj)
# Update pages object
pages_obj.d.d["Count"] = str(len(page_objs))
pages_obj.d.d["Kids"] = "[" + " ".join([ref(x.id) for x in page_objs]) + "]"
# Output the final PDF document to stdout
outf.write(str(doc).encode("latin1"))
def usage(script, msg):
"""Display usage information and an optional error message."""
if msg:
sys.stderr.write("%s: %s\n" % (script, msg))
sys.stderr.write("Usage: %s [file_basename] > out.pdf\n" % script)
sys.exit(1)
if __name__ == "__main__":
# RUNASSUDO: Overhauled to use lossless encoding
pages = sys.argv[1:]
# Validate that pages were found
if not pages:
usage(sys.argv[0], "no pages found!")
create_pdf(None, pages)