63 lines
2.1 KiB
Python
63 lines
2.1 KiB
Python
# pdf-segmented: Generate PDFs using separate compression for foreground and background
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# Copyright (C) 2025 Lee Yingtong Li
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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from ..compression import CompressedPage
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from ..input import InputPages
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from ..util import assert_has_djvm, assert_has_djvumake
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import os
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import subprocess
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import tempfile
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from typing import Generator
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def djvu_write_pages(
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input_pages: InputPages,
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compressed_pages: Generator[CompressedPage],
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output_file: str,
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tempdir: str
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) -> None:
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assert_has_djvm('DjVu output requires DjVuLibre')
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assert_has_djvumake('DjVu output requires DjVuLibre')
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djvu_page_files = []
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try:
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# Write each page
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for compressed_page in compressed_pages:
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try:
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# Combine foreground and background
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_, page_djvu_file = tempfile.mkstemp(suffix='.djvu', dir=tempdir)
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# TODO: Handle case where empty background or foreground
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args = ['djvumake', page_djvu_file, 'INFO={},{},{}'.format(input_pages.width, input_pages.height, round(input_pages.dpi))]
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args.append('Sjbz={}'.format(compressed_page.fg.filename))
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args.append('BG44={}'.format(compressed_page.bg.filename))
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subprocess.run(args, check=True, capture_output=True)
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djvu_page_files.append(page_djvu_file)
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finally:
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# Clean up
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compressed_page.bg.cleanup()
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compressed_page.fg.cleanup()
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# Combine pages
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subprocess.run(['djvm', '-c', output_file] + djvu_page_files, check=True)
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finally:
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# Clean up
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for page_djvu_file in djvu_page_files:
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os.unlink(page_djvu_file)
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