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Previously if we found vectors of any sort on a page, we would bump the DPI up to 400. We did nothing about pages with text. As a result, pages with a low image resolution and printable text would have the text downgraded to image resolution when --force-ocr was used. We don't try to determine if the text is visible or invisible OCR text, since that is a slower test. --redo-ocr would improve such cases anyway.
64 lines
2.0 KiB
Python
64 lines
2.0 KiB
Python
# © 2021 James R. Barlow: github.com/jbarlow83
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#
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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from unittest.mock import Mock
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import pytest
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from PIL import Image
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from reportlab.lib.units import inch
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from reportlab.lib.utils import ImageReader
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from reportlab.pdfgen.canvas import Canvas
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from ocrmypdf import _pipeline, pdfinfo
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from ocrmypdf.helpers import Resolution
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@pytest.fixture(scope='session')
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def rgb_image():
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im = Image.new('RGB', (8, 8))
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im.putpixel((4, 4), (255, 0, 0))
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im.putpixel((5, 5), (0, 255, 0))
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im.putpixel((6, 6), (0, 0, 255))
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return ImageReader(im)
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DUMMY_OVERSAMPLE_RESOLUTION = Resolution(42.0, 42.0)
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VECTOR_RESOLUTION = Resolution(_pipeline.VECTOR_PAGE_DPI, _pipeline.VECTOR_PAGE_DPI)
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@pytest.mark.parametrize(
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'image, text, vector, result',
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[
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(False, False, False, VECTOR_RESOLUTION),
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(False, True, False, VECTOR_RESOLUTION),
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(True, False, False, DUMMY_OVERSAMPLE_RESOLUTION),
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(True, True, False, VECTOR_RESOLUTION),
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(False, False, True, VECTOR_RESOLUTION),
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(False, True, True, VECTOR_RESOLUTION),
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(True, False, True, VECTOR_RESOLUTION),
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(True, True, True, VECTOR_RESOLUTION),
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],
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)
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def test_dpi_needed(image, text, vector, result, rgb_image, outdir):
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c = Canvas(str(outdir / 'dpi.pdf'), pagesize=(5 * inch, 5 * inch))
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if image:
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c.drawImage(rgb_image, 1 * inch, 1 * inch, width=1 * inch, height=1 * inch)
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if text:
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c.drawString(1 * inch, 4 * inch, "Actual text")
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if vector:
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c.ellipse(3 * inch, 3 * inch, 4 * inch, 4 * inch)
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c.showPage()
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c.save()
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mock = Mock()
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mock.oversample = DUMMY_OVERSAMPLE_RESOLUTION[0]
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pi = pdfinfo.PdfInfo(outdir / 'dpi.pdf')
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assert _pipeline.get_canvas_square_dpi(pi[0], mock) == result
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assert _pipeline.get_page_square_dpi(pi[0], mock) == result
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