commit d4b9c8f4bddc9dad2130bf5050bf664f4a4ec0cf Author: RunasSudo Date: Thu May 8 19:27:05 2025 +1000 Initial commit diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..8d35cb3 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +__pycache__ +*.pyc diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..be3f7b2 --- /dev/null +++ b/COPYING @@ -0,0 +1,661 @@ + GNU AFFERO GENERAL PUBLIC LICENSE + Version 3, 19 November 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU Affero General Public License is a free, copyleft license for +software and other kinds of works, specifically designed to ensure +cooperation with the community in the case of network server software. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If your software can interact with users remotely through a computer +network, you should also make sure that it provides a way for users to +get its source. For example, if your program is a web application, its +interface could display a "Source" link that leads users to an archive +of the code. There are many ways you could offer source, and different +solutions will be better for different programs; see section 13 for the +specific requirements. + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU AGPL, see +. diff --git a/pdf_segmented/__init__.py b/pdf_segmented/__init__.py new file mode 100644 index 0000000..5b45ea2 --- /dev/null +++ b/pdf_segmented/__init__.py @@ -0,0 +1,82 @@ +# pdf-segmented: Generate PDFs using separate compression for foreground and background +# Copyright (C) 2025 Lee Yingtong Li +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU Affero 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 Affero General Public License for more details. +# +# You should have received a copy of the GNU Affero General Public License +# along with this program. If not, see . + +from .compression import compress_pages +from .input.xcf import xcf_get_pages +from .output.pdf import pdf_write_pages +from .segmentation import segment_pages + +import os +import sys +import tempfile +from typing import Optional + +def convert_file( + input_file: str, + output_file: str, + input_format: Optional[str] = None, + output_format: Optional[str] = None, + fg_compression: str = 'jbig2', + bg_compression: str = 'jpeg', + jpeg_quality: Optional[float] = None +) -> None: + # Create temporary directory + tempdir = tempfile.mkdtemp('pdf-segmented') + + try: + # Impute arguments + if input_format is None: + if input_file.endswith('.xcf'): + input_format = 'xcf' + else: + print('Warning: Unknown input file extension, assuming XCF', file=sys.stderr) + if output_format is None: + if output_file.endswith('.pdf'): + output_format = 'pdf' + else: + print('Warning: Unknown output file extension, assuming PDF', file=sys.stderr) + + # Get input pages + if input_format == 'xcf': + input_pages = xcf_get_pages(input_file) + else: + raise NotImplementedError() + + # Segment foreground and background + segmented_pages = segment_pages(input_pages) + + # Compress layers + compressed_pages = compress_pages( + segmented_pages=segmented_pages, + fg_compression=fg_compression, + bg_compression=bg_compression, + jpeg_quality=jpeg_quality, + tempdir=tempdir + ) + + # Convert to output format + if output_format == 'pdf': + pdf_write_pages( + input_pages=input_pages, + compressed_pages=compressed_pages, + output_file=output_file + ) + else: + raise NotImplementedError() + finally: + # Clean up + if os.path.exists(tempdir): + os.rmdir(tempdir) diff --git a/pdf_segmented/__main__.py b/pdf_segmented/__main__.py new file mode 100644 index 0000000..d8c4f0b --- /dev/null +++ b/pdf_segmented/__main__.py @@ -0,0 +1,45 @@ +# pdf-segmented: Generate PDFs using separate compression for foreground and background +# Copyright (C) 2025 Lee Yingtong Li +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU Affero 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 Affero General Public License for more details. +# +# You should have received a copy of the GNU Affero General Public License +# along with this program. If not, see . + +from . import convert_file + +import argparse + +# Parse CLI arguments +parser = argparse.ArgumentParser( + prog='pdf-segmented', + description='Generate PDFs using separate compression for foreground and background' +) +parser.add_argument('input_file') +parser.add_argument('output_file') +parser.add_argument('--input-format', choices=['xcf']) +parser.add_argument('--output-format', choices=['pdf']) +parser.add_argument('--fg-compression', default='jbig2', choices=['jbig2']) +parser.add_argument('--bg-compression', default='jpeg', choices=['jpeg']) +parser.add_argument('--jpeg-quality', type=float) + +args = parser.parse_args() + +# Run app +convert_file( + input_file=args.input_file, + output_file=args.output_file, + input_format=args.input_format, + output_format=args.output_format, + fg_compression=args.fg_compression, + bg_compression=args.bg_compression, + jpeg_quality=args.jpeg_quality +) diff --git a/pdf_segmented/compression/__init__.py b/pdf_segmented/compression/__init__.py new file mode 100644 index 0000000..900973f --- /dev/null +++ b/pdf_segmented/compression/__init__.py @@ -0,0 +1,93 @@ +# pdf-segmented: Generate PDFs using separate compression for foreground and background +# Copyright (C) 2025 Lee Yingtong Li +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU Affero 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 Affero General Public License for more details. +# +# You should have received a copy of the GNU Affero General Public License +# along with this program. If not, see . + +class CompressedLayer: + # Superclass for all compressed layer types (JPEG, JBIG2, etc.) + + def cleanup(): + # Clean up any temporary files, etc. + pass + +from .jbig2 import jbig2_compress_layer +from .jpeg import jpeg_compress_layer +from ..segmentation import SegmentedPage + +from PIL import Image + +from dataclasses import dataclass +from typing import Generator, Iterable, Optional + +@dataclass +class CompressedPage: + fg: CompressedLayer + bg: CompressedLayer + +def compress_pages( + segmented_pages: Iterable[SegmentedPage], + fg_compression: str, + bg_compression: str, + jpeg_quality: Optional[float], + tempdir: str +) -> Generator[CompressedPage]: + + # Compress foreground and background layers on each segmented page + for segmented_page in segmented_pages: + yield compress_page( + segmented_page=segmented_page, + fg_compression=fg_compression, + bg_compression=bg_compression, + jpeg_quality=jpeg_quality, + tempdir=tempdir + ) + +def compress_page( + segmented_page: SegmentedPage, + fg_compression: str, + bg_compression: str, + jpeg_quality: Optional[float], + tempdir: str +) -> CompressedPage: + + # Compress foreground and background layers + return CompressedPage( + fg=compress_layer( + layer=segmented_page.fg, + compression=fg_compression, + jpeg_quality=jpeg_quality, + tempdir=tempdir + ), + bg=compress_layer( + layer=segmented_page.bg, + compression=bg_compression, + jpeg_quality=jpeg_quality, + tempdir=tempdir + ) + ) + +def compress_layer( + layer: Image, + compression: str, + jpeg_quality: Optional[float], + tempdir: str +) -> CompressedLayer: + + # Compress the given layer + if compression == 'jbig2': + return jbig2_compress_layer(layer=layer, tempdir=tempdir) + elif compression == 'jpeg': + return jpeg_compress_layer(layer=layer, jpeg_quality=jpeg_quality) + else: + raise NotImplementedError() diff --git a/pdf_segmented/compression/jbig2.py b/pdf_segmented/compression/jbig2.py new file mode 100644 index 0000000..728a93f --- /dev/null +++ b/pdf_segmented/compression/jbig2.py @@ -0,0 +1,48 @@ +# pdf-segmented: Generate PDFs using separate compression for foreground and background +# Copyright (C) 2025 Lee Yingtong Li +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU Affero 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 Affero General Public License for more details. +# +# You should have received a copy of the GNU Affero General Public License +# along with this program. If not, see . + +from . import CompressedLayer +from ..util import assert_has_jbig2 + +from PIL import Image + +from dataclasses import dataclass +import os +import subprocess +import tempfile + +@dataclass +class JBIG2Layer(CompressedLayer): + data: bytes + +def jbig2_compress_layer(layer: Image, tempdir: str) -> JBIG2Layer: + assert_has_jbig2('JBIG2 compression requires jbig2enc') + + # Save image to PNG temporarily + _, png_file = tempfile.mkstemp(suffix='.png', dir=tempdir) + + try: + layer.save(png_file, format='png') + + # Compress using JBIG2 + # Passing "-s" uses lossly JBIG2 encoding, so we do not pass this option + jbig2_proc = subprocess.run(['jbig2', '-p', '-v', png_file], cwd=tempdir, check=True, capture_output=True) + jbig2_data = jbig2_proc.stdout + finally: + # Clean up + os.unlink(png_file) + + return JBIG2Layer(data=jbig2_data) diff --git a/pdf_segmented/compression/jpeg.py b/pdf_segmented/compression/jpeg.py new file mode 100644 index 0000000..28d4528 --- /dev/null +++ b/pdf_segmented/compression/jpeg.py @@ -0,0 +1,38 @@ +# pdf-segmented: Generate PDFs using separate compression for foreground and background +# Copyright (C) 2025 Lee Yingtong Li +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU Affero 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 Affero General Public License for more details. +# +# You should have received a copy of the GNU Affero General Public License +# along with this program. If not, see . + +from . import CompressedLayer + +from PIL import Image + +from dataclasses import dataclass +import io +from typing import Optional + +@dataclass +class JPEGLayer(CompressedLayer): + data: bytes + +def jpeg_compress_layer(layer: Image, jpeg_quality: Optional[float]) -> JPEGLayer: + save_kwargs = {} + if jpeg_quality is not None: + save_kwargs['quality'] = jpeg_quality + + # Save image to JPEG + bytesio = io.BytesIO() + layer.save(bytesio, format='jpeg', **save_kwargs) + + return JPEGLayer(data=bytesio.getvalue()) diff --git a/pdf_segmented/input/__init__.py b/pdf_segmented/input/__init__.py new file mode 100644 index 0000000..93fa8f2 --- /dev/null +++ b/pdf_segmented/input/__init__.py @@ -0,0 +1,29 @@ +# pdf-segmented: Generate PDFs using separate compression for foreground and background +# Copyright (C) 2025 Lee Yingtong Li +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU Affero 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 Affero General Public License for more details. +# +# You should have received a copy of the GNU Affero General Public License +# along with this program. If not, see . + +from PIL import Image + +from dataclasses import dataclass +from typing import Generator + +@dataclass +class InputPages: + file_name: str + num_pages: int + width: int + height: int + dpi: float + pages: Generator[Image] diff --git a/pdf_segmented/input/xcf.py b/pdf_segmented/input/xcf.py new file mode 100644 index 0000000..d7c2fb5 --- /dev/null +++ b/pdf_segmented/input/xcf.py @@ -0,0 +1,92 @@ +# pdf-segmented: Generate PDFs using separate compression for foreground and background +# Copyright (C) 2025 Lee Yingtong Li +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU Affero 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 Affero General Public License for more details. +# +# You should have received a copy of the GNU Affero General Public License +# along with this program. If not, see . + +from . import InputPages +from ..util import assert_has_imagemagick + +from PIL import Image + +import io +import subprocess +import sys +from typing import Generator, List + +def xcf_get_pages(input_file: str) -> InputPages: + # Check ImageMagick support + assert_has_imagemagick('XCF support requires ImageMagick') + + # Init metadata + num_layers = 0 + dpi = None + width = None + height = None + + # Read metadata + proc = subprocess.run(['magick', 'identify', '-verbose', input_file], capture_output=True, encoding='utf-8', check=True) + for line in proc.stdout.splitlines(): + if line == 'Image:': + num_layers += 1 + elif line.startswith(' Geometry: '): + layer_width = float(line[len(' Geometry: '):line.index('x')]) + layer_height = float(line[line.index('x')+1:line.index('+')]) + if (width is not None and layer_width != width) or (height is not None and layer_height != height): + print('Error: Image with variable-dimension layers is not supported ({}x{} vs {}x{})'.format(layer_width, layer_height, width, height)) + sys.exit(1) + width = layer_width + height = layer_height + elif line.startswith(' Resolution: '): + resolution_x = float(line[len(' Resolution: '):line.index('x')]) + resolution_y = float(line[line.index('x')+1:]) + if resolution_x != resolution_y: + raise Exception('Unexpected non-square DPI ({}x{})'.format(resolution_x, resolution_y)) + if dpi is not None and resolution_x != dpi: + raise Exception('Unexpected variable DPI image ({} vs {})'.format(resolution_x, dpi)) + dpi = resolution_x + elif line.startswith(' Units: '): + if line != ' Units: PixelsPerInch': + raise Exception('Unexpected Units (expected PixelsPerInch, got {})'.format(line[len(' Units: '):])) + + if num_layers == 0: + raise Exception('Unexpected 0 layers') + if dpi is None: + raise Exception('Unexpected no DPI information') + if width is None: + raise Exception('Unexpected no width information') + if height is None: + raise Exception('Unexpected no height information') + + return InputPages( + file_name=input_file, + num_pages=num_layers, + width=width, + height=height, + dpi=dpi, + pages=_do_get_pages(input_file, num_layers) + ) + +def _do_get_pages(input_file: str, num_layers: int) -> Generator[Image]: + for layer_num in range(num_layers): + # Extract layer as PNG (to proc.stdout) + proc = subprocess.run(['magick', '{}[{}]'.format(input_file, layer_num), 'png:-'], capture_output=True) + + if proc.returncode != 0: + raise Exception('ImageMagick error') + + # Read into PIL Image + png_data = io.BytesIO(proc.stdout) + image = Image.open(png_data) + + yield image diff --git a/pdf_segmented/output/pdf.py b/pdf_segmented/output/pdf.py new file mode 100644 index 0000000..56073a7 --- /dev/null +++ b/pdf_segmented/output/pdf.py @@ -0,0 +1,121 @@ +# pdf-segmented: Generate PDFs using separate compression for foreground and background +# Copyright (C) 2025 Lee Yingtong Li +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU Affero 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 Affero General Public License for more details. +# +# You should have received a copy of the GNU Affero General Public License +# along with this program. If not, see . + +from ..compression import CompressedLayer, CompressedPage +from ..compression.jbig2 import JBIG2Layer +from ..compression.jpeg import JPEGLayer +from ..input import InputPages + +from pikepdf import ContentStreamInstruction, Name, Operator, Page, Pdf, Stream, unparse_content_stream + +from typing import Generator + +def pdf_write_pages( + input_pages: InputPages, + compressed_pages: Generator[CompressedPage], + output_file: str +) -> None: + # Get size of image in PostScript points + width_pt = input_pages.width / input_pages.dpi * 72 + height_pt = input_pages.height / input_pages.dpi * 72 + + # Build PDF + pdf = Pdf.new() + + # Write each page + for compressed_page in compressed_pages: + page = pdf.add_blank_page(page_size=(width_pt, height_pt)) + + # Write each layer to the page + content_instructions = [] + pdf_write_layer(input_pages=input_pages, pdf=pdf, page=page, layer=compressed_page.bg, content_instructions=content_instructions) + pdf_write_layer(input_pages=input_pages, pdf=pdf, page=page, layer=compressed_page.fg, content_instructions=content_instructions) + + # Generate content stream + wrapped_instructions = [ + ContentStreamInstruction([], Operator('q')), + ContentStreamInstruction([width_pt, 0, 0, height_pt, 0, 0], Operator('cm')) + ] + content_instructions + [ + ContentStreamInstruction([], Operator('Q')), + ] + content_stream = unparse_content_stream(wrapped_instructions) + page.Contents.write(content_stream) + + # Save PDF + pdf.save(output_file) + +def pdf_write_layer( + input_pages: InputPages, + pdf: Pdf, + page: Page, + layer: CompressedLayer, + content_instructions, +) -> None: + + # Write the layer to PDF + if isinstance(layer, JBIG2Layer): + pdf_write_image( + input_pages=input_pages, + pdf=pdf, + page=page, + value=layer.data, + content_instructions=content_instructions, + ColorSpace=Name.DeviceGray, + Filter=Name.JBIG2Decode, + BitsPerComponent=1, + Mask=[1, 1] # Layer mask + ) + elif isinstance(layer, JPEGLayer): + pdf_write_image( + input_pages=input_pages, + pdf=pdf, + page=page, + value=layer.data, + content_instructions=content_instructions, + ColorSpace=Name.DeviceRGB, + Filter=Name.DCTDecode, + BitsPerComponent=8 + ) + else: + raise NotImplementedError() + +def pdf_write_image( + input_pages: InputPages, + pdf: Pdf, + page: Page, + value: bytes, + content_instructions, + **kwargs +) -> None: + + # Write the layer as an Image + + # Insert the Image as an XObject resource + xobj = Stream( + pdf, + value, + Type=Name.XObject, + Subtype=Name.Image, + Width=input_pages.width, + Height=input_pages.height, + **kwargs + ) + xobj_name = page.add_resource(xobj, '/XObject') + + # Add render instruction to the content stream + content_instructions.append( + ContentStreamInstruction([xobj_name], Operator('Do')) + ) diff --git a/pdf_segmented/segmentation.py b/pdf_segmented/segmentation.py new file mode 100644 index 0000000..7254e23 --- /dev/null +++ b/pdf_segmented/segmentation.py @@ -0,0 +1,56 @@ +# pdf-segmented: Generate PDFs using separate compression for foreground and background +# Copyright (C) 2025 Lee Yingtong Li +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU Affero 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 Affero General Public License for more details. +# +# You should have received a copy of the GNU Affero General Public License +# along with this program. If not, see . + +from .input import InputPages + +import numpy +from PIL import Image + +from dataclasses import dataclass +from typing import Generator, List + +@dataclass +class SegmentedPage: + fg: Image + bg: Image + +def segment_pages(input_pages: InputPages) -> Generator[SegmentedPage]: + for page_num, input_page in enumerate(input_pages.pages): + print('Page {} of {}'.format(page_num + 1, input_pages.num_pages)) + + yield segment_page(input_page) + +def segment_page(input_page: Image) -> SegmentedPage: + # Segment the input page into foreground and background + + # Convert image to foreground/background + image_rgb = input_page.convert('RGB') + numpy_rgb = numpy.asarray(image_rgb) + black_pixels = (numpy_rgb[:,:,0] == 0) & (numpy_rgb[:,:,1] == 0) & (numpy_rgb[:,:,2] == 0) + + # Foreground is only black + numpy_fg = numpy_rgb.copy() + numpy_fg[~black_pixels,:] = [255, 255, 255] + image_fg = Image.fromarray(numpy_fg, image_rgb.mode) + + # Background is only non-black + numpy_bg = numpy_rgb.copy() + numpy_bg[black_pixels,:] = [255, 255, 255] + image_bg = Image.fromarray(numpy_bg, image_rgb.mode) + + # TODO: Handle case where empty background or foreground + + return SegmentedPage(fg=image_fg, bg=image_bg) diff --git a/pdf_segmented/util.py b/pdf_segmented/util.py new file mode 100644 index 0000000..7ae2547 --- /dev/null +++ b/pdf_segmented/util.py @@ -0,0 +1,28 @@ +# pdf-segmented: Generate PDFs using separate compression for foreground and background +# Copyright (C) 2025 Lee Yingtong Li +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU Affero 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 Affero General Public License for more details. +# +# You should have received a copy of the GNU Affero General Public License +# along with this program. If not, see . + +import shutil +import sys + +def assert_has_imagemagick(error_message: str = 'ImageMagick is required') -> None: + if shutil.which('magick') is None: + print('Error: {} (magick not found on PATH)'.format(error_message), file=sys.stderr) + sys.exit(1) + +def assert_has_jbig2(error_message: str = 'jbig2enc is required') -> None: + if shutil.which('jbig2') is None: + print('Error: {} (jbig2 not found on PATH)'.format(error_message), file=sys.stderr) + sys.exit(1)