Encode JBIG2 losslessly
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COPYING.APACHE2
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COPYING.APACHE2
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12
README.md
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README.md
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# file-jbig2pdf
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# file-jbig2pdf
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GIMP 3.0 plug-in for exporting JBIG2-encoded PDF files
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GIMP 3.0 plug-in for exporting lossless JBIG2-encoded PDF files
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## Usage
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## Usage
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file-jbig2pdf has only been tested on Linux. It requires [jbig2enc](https://github.com/agl/jbig2enc) version 0.28 to be installed, and its *jbig2* and *pdf.py* commands to be available on PATH.
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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.
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Install *file-jbig2pdf.py* at *$HOME/.config/GIMP/3.0/plug-ins/file-jbig2pdf/file-jbig2pdf.py* and ensure that the file is executable.
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Install *file-jbig2pdf.py* and *jbig2topdf_lossless.py* under *$HOME/.config/GIMP/3.0/plug-ins/file-jbig2pdf/* and ensure that *file-jbig2pdf.py* is executable.
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Set up your GIMP image as desired in the standard fashion for PDF export (one layer per page, bottom layer first) and under *File* → *Export As…*, expand *Select File Type (By Extension)* and select *Portable Document Format (JBIG2)*.
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Set up your GIMP image as desired in the standard fashion for PDF export (one layer per page, bottom layer first) and under *File* → *Export As…*, expand *Select File Type (By Extension)* and select *Portable Document Format (JBIG2)*.
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@ -14,7 +14,9 @@ Set up your GIMP image as desired in the standard fashion for PDF export (one la
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Copyright © 2024 Lee Yingtong Li (RunasSudo)
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Copyright © 2024 Lee Yingtong Li (RunasSudo)
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Loosely adapted from GIMP file-openraster.py – Copyright © 2009 by Jon Nordby \<jononor@gmail.com\>, licensed under the GPLv3\
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*file-jbig2pdf.py* loosely adapted from GIMP file-openraster.py – Copyright © 2009 by Jon Nordby \<jononor@gmail.com\>, licensed under the GPLv3\
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In turn based on MyPaint source code by Martin Renold
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In turn based on MyPaint source code by Martin Renold
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Licensed under the GNU General Public License version 3 or later.
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*jbig2topdf_lossless.py* adapted from jbig2enc by Adam Langley <agl@imperialviolet.org> - Copyright (C) 2006 Google Inc., licensed under Apache v2
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The file-jbig2pdf project is licensed under the GNU General Public License version 3 or later.
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@ -31,19 +31,16 @@ import subprocess
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import sys
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import sys
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import tempfile
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import tempfile
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import jbig2topdf_lossless
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def export_jbig2pdf(procedure, run_mode, image, file, options, metadata, config, data):
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def export_jbig2pdf(procedure, run_mode, image, file, options, metadata, config, data):
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# Check jbig2enc version
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# Check jbig2enc version
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try:
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try:
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jbig2version = subprocess.run(['jbig2', '-V'], capture_output=True)
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subprocess.run(['jbig2', '-V'])
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except FileNotFoundError:
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except FileNotFoundError:
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Gimp.message('jbig2 command (from jbig2enc) not in PATH')
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Gimp.message('jbig2 command (from jbig2enc) not in PATH')
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return Gimp.ValueArray.new_from_values([GObject.Value(Gimp.PDBStatusType, Gimp.PDBStatusType.EXECUTION_ERROR)])
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return Gimp.ValueArray.new_from_values([GObject.Value(Gimp.PDBStatusType, Gimp.PDBStatusType.EXECUTION_ERROR)])
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if jbig2version.stderr != b'jbig2enc 0.28\n':
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# We only support 0.28 for now, because from 0.29 pdf.py is renamed to jbig2topdf.py
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Gimp.message('Unsupported version of jbig2enc (expected 0.28, got "{}")'.format(jbig2version.stderr.decode('utf-8').strip()))
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return Gimp.ValueArray.new_from_values([GObject.Value(Gimp.PDBStatusType, Gimp.PDBStatusType.EXECUTION_ERROR)])
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# jbig2enc OK!
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# jbig2enc OK!
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Gimp.progress_init('Exporting PDF JBIG2 image')
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Gimp.progress_init('Exporting PDF JBIG2 image')
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@ -57,7 +54,7 @@ def export_jbig2pdf(procedure, run_mode, image, file, options, metadata, config,
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for sublayer in unroll_layers(layer.get_children()):
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for sublayer in unroll_layers(layer.get_children()):
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yield sublayer
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yield sublayer
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pngs_out = []
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jb2s_out = []
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# Export image layer by layer (bottom layer first)
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# Export image layer by layer (bottom layer first)
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for i, layer in enumerate(reversed(list(unroll_layers(image.get_layers())))):
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for i, layer in enumerate(reversed(list(unroll_layers(image.get_layers())))):
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@ -91,33 +88,35 @@ def export_jbig2pdf(procedure, run_mode, image, file, options, metadata, config,
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tmp_img.delete() # Clean up buffer
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tmp_img.delete() # Clean up buffer
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if os.path.exists(png_out):
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pngs_out.append(png_out)
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else:
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Gimp.message('Unknown error exporting layer {}'.format(i))
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os.rmdir(tempdir)
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Gimp.progress_end()
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return Gimp.ValueArray.new_from_values([GObject.Value(Gimp.PDBStatusType, Gimp.PDBStatusType.EXECUTION_ERROR)])
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# Execute jbig2enc
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# Execute jbig2enc
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jb2_out = os.path.join(tempdir, '{:03d}.jb2'.format(i))
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try:
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try:
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subprocess.run(['jbig2', '-s', '-p', '-v'] + pngs_out, cwd=tempdir, check=True)
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with open(jb2_out, 'wb') as jb2_file:
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# Passing "-s" uses lossly JBIG2 encoding, so we do not pass this option
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subprocess.run(['jbig2', '-p', '-v', png_out], cwd=tempdir, check=True, stdout=jb2_file)
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except subprocess.CalledProcessError:
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except subprocess.CalledProcessError:
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Gimp.message('Unknown error in jbig2enc')
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Gimp.message('Unknown error in jbig2enc')
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os.rmdir(tempdir)
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os.rmdir(tempdir)
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Gimp.progress_end()
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Gimp.progress_end()
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return Gimp.ValueArray.new_from_values([GObject.Value(Gimp.PDBStatusType, Gimp.PDBStatusType.EXECUTION_ERROR)])
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return Gimp.ValueArray.new_from_values([GObject.Value(Gimp.PDBStatusType, Gimp.PDBStatusType.EXECUTION_ERROR)])
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# Execute pdf.py
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os.unlink(png_out)
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jb2s_out.append(jb2_out)
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# Convert to PDF
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# Use .tmpsave extension, so we don't overwrite a valid file if there is an exception
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# Use .tmpsave extension, so we don't overwrite a valid file if there is an exception
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pdf_tmpout = file.peek_path() + '.tmpsave'
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pdf_tmpout = file.peek_path() + '.tmpsave'
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try:
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try:
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with open(pdf_tmpout, 'wb') as pdf_file:
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with open(pdf_tmpout, 'wb') as pdf_file:
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subprocess.run(['pdf.py', 'output'], cwd=tempdir, check=True, stdout=pdf_file)
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# The Python script supplied with jbig2enc only supports lossy JBIG2 encoding (https://github.com/agl/jbig2enc/pull/77)
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# So therefore we bundle a modified script which works on lossless JBIG2 images
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jbig2topdf_lossless.create_pdf(None, jb2s_out, pdf_file)
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success = True
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success = True
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except subprocess.CalledProcessError:
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except Exception:
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success = False
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success = False
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Gimp.message('Unknown error in jbig2enc pdf.py')
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Gimp.message('Unknown error converting JBIG2 images to PDF')
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os.rmdir(tempdir)
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os.rmdir(tempdir)
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Gimp.progress_end()
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Gimp.progress_end()
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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)])
|
||||||
@ -127,16 +126,11 @@ def export_jbig2pdf(procedure, run_mode, image, file, options, metadata, config,
|
|||||||
|
|
||||||
# Success! - Finalise and clean up
|
# Success! - Finalise and clean up
|
||||||
|
|
||||||
# Remove intermediate PNG files
|
|
||||||
for png_out in pngs_out:
|
|
||||||
os.unlink(png_out)
|
|
||||||
|
|
||||||
# Remove intermediate JBIG2 files
|
# Remove intermediate JBIG2 files
|
||||||
for i in range(len(pngs_out)):
|
for i in range(len(jb2s_out)):
|
||||||
os.unlink(os.path.join(tempdir, 'output.{:04d}'.format(i)))
|
os.unlink(os.path.join(tempdir, '{:03d}.jb2'.format(i)))
|
||||||
|
|
||||||
# Remove intermediate JBIG2 symbol file and temp directory
|
# Remove temp directory
|
||||||
os.unlink(os.path.join(tempdir, 'output.sym'))
|
|
||||||
os.rmdir(tempdir)
|
os.rmdir(tempdir)
|
||||||
|
|
||||||
# Save over destination file
|
# Save over destination file
|
||||||
|
234
jbig2topdf_lossless.py
Normal file
234
jbig2topdf_lossless.py
Normal file
@ -0,0 +1,234 @@
|
|||||||
|
#!/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)
|
Loading…
Reference in New Issue
Block a user