mirror of
https://github.com/ocrmypdf/OCRmyPDF.git
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740f67091c
Technically OCROptions is more Pythonic but we have several pre-existing classes named OcrWhatever. Go with the local flow.
600 lines
20 KiB
Python
600 lines
20 KiB
Python
# SPDX-FileCopyrightText: 2025 James R. Barlow
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# SPDX-License-Identifier: MPL-2.0
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"""Tests for the --rasterizer CLI option."""
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from __future__ import annotations
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from io import BytesIO
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import img2pdf
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import pikepdf
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import pytest
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from PIL import Image
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from ocrmypdf._options import OcrOptions
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from ocrmypdf._plugin_manager import get_plugin_manager
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from ocrmypdf.helpers import IMG2PDF_KWARGS, Resolution
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from .conftest import check_ocrmypdf
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# Check if pypdfium2 is available
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try:
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import pypdfium2 # noqa: F401
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PYPDFIUM_AVAILABLE = True
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except ImportError:
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PYPDFIUM_AVAILABLE = False
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class TestRasterizerOption:
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"""Test the --rasterizer CLI option."""
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def test_rasterizer_auto_default(self, resources, outpdf):
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"""Test that --rasterizer auto (default) works."""
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check_ocrmypdf(
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resources / 'graph.pdf',
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outpdf,
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'--rasterizer',
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'auto',
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'--plugin',
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'tests/plugins/tesseract_noop.py',
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)
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def test_rasterizer_ghostscript(self, resources, outpdf):
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"""Test that --rasterizer ghostscript works."""
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check_ocrmypdf(
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resources / 'graph.pdf',
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outpdf,
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'--rasterizer',
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'ghostscript',
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'--plugin',
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'tests/plugins/tesseract_noop.py',
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)
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@pytest.mark.skipif(not PYPDFIUM_AVAILABLE, reason="pypdfium2 not installed")
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def test_rasterizer_pypdfium(self, resources, outpdf):
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"""Test that --rasterizer pypdfium works when pypdfium2 is installed."""
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check_ocrmypdf(
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resources / 'graph.pdf',
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outpdf,
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'--rasterizer',
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'pypdfium',
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'--plugin',
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'tests/plugins/tesseract_noop.py',
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)
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def test_rasterizer_invalid(self):
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"""Test that an invalid rasterizer value is rejected."""
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with pytest.raises(ValueError, match="rasterizer must be one of"):
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OcrOptions(
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input_file='test.pdf', output_file='out.pdf', rasterizer='invalid'
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)
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class TestRasterizerWithRotation:
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"""Test --rasterizer interaction with --rotate-pages."""
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def test_ghostscript_with_rotation(self, resources, outpdf):
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"""Test Ghostscript rasterizer with page rotation."""
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check_ocrmypdf(
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resources / 'cardinal.pdf',
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outpdf,
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'--rasterizer',
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'ghostscript',
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'--rotate-pages',
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'--rotate-pages-threshold',
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'0.1',
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'--plugin',
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'tests/plugins/tesseract_cache.py',
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)
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@pytest.mark.skipif(not PYPDFIUM_AVAILABLE, reason="pypdfium2 not installed")
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def test_pypdfium_with_rotation(self, resources, outpdf):
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"""Test pypdfium rasterizer with page rotation."""
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check_ocrmypdf(
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resources / 'cardinal.pdf',
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outpdf,
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'--rasterizer',
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'pypdfium',
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'--rotate-pages',
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'--rotate-pages-threshold',
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'0.1',
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'--plugin',
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'tests/plugins/tesseract_cache.py',
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)
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def test_auto_with_rotation(self, resources, outpdf):
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"""Test auto rasterizer with page rotation."""
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check_ocrmypdf(
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resources / 'cardinal.pdf',
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outpdf,
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'--rasterizer',
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'auto',
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'--rotate-pages',
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'--rotate-pages-threshold',
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'0.1',
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'--plugin',
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'tests/plugins/tesseract_cache.py',
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)
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class TestRasterizerHookDirect:
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"""Test rasterize_pdf_page hook directly with different rasterizer options."""
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def test_ghostscript_hook_respects_option(self, resources, tmp_path):
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"""Test that Ghostscript hook returns None when pypdfium is requested."""
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pm = get_plugin_manager([])
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# Create options requesting pypdfium
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options = OcrOptions(
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input_file=resources / 'graph.pdf',
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output_file=tmp_path / 'out.pdf',
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rasterizer='pypdfium',
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)
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img = tmp_path / 'ghostscript_test.png'
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result = pm.rasterize_pdf_page(
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input_file=resources / 'graph.pdf',
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output_file=img,
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raster_device='pngmono',
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raster_dpi=Resolution(50, 50),
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page_dpi=Resolution(50, 50),
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pageno=1,
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rotation=0,
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filter_vector=False,
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stop_on_soft_error=True,
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options=options,
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use_cropbox=False,
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)
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# When pypdfium is requested:
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# - If pypdfium IS available, pypdfium handles it and returns the path
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# - If pypdfium is NOT available, both plugins return None
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# (ghostscript returns None because pypdfium was requested,
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# pypdfium returns None because it's not installed)
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if PYPDFIUM_AVAILABLE:
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assert result == img
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else:
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assert result is None
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def test_pypdfium_hook_respects_option(self, resources, tmp_path):
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"""Test that pypdfium hook returns None when ghostscript is requested."""
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pm = get_plugin_manager([])
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# Create options requesting ghostscript
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options = OcrOptions(
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input_file=resources / 'graph.pdf',
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output_file=tmp_path / 'out.pdf',
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rasterizer='ghostscript',
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)
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img = tmp_path / 'pypdfium_test.png'
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result = pm.rasterize_pdf_page(
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input_file=resources / 'graph.pdf',
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output_file=img,
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raster_device='pngmono',
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raster_dpi=Resolution(50, 50),
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page_dpi=Resolution(50, 50),
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pageno=1,
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rotation=0,
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filter_vector=False,
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stop_on_soft_error=True,
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options=options,
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use_cropbox=False,
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)
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# Ghostscript should handle it
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assert result == img
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assert img.exists()
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def test_auto_uses_pypdfium_when_available(self, resources, tmp_path):
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"""Test that auto mode uses pypdfium when available."""
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pm = get_plugin_manager([])
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options = OcrOptions(
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input_file=resources / 'graph.pdf',
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output_file=tmp_path / 'out.pdf',
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rasterizer='auto',
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)
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img = tmp_path / 'auto_test.png'
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result = pm.rasterize_pdf_page(
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input_file=resources / 'graph.pdf',
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output_file=img,
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raster_device='pngmono',
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raster_dpi=Resolution(50, 50),
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page_dpi=Resolution(50, 50),
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pageno=1,
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rotation=0,
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filter_vector=False,
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stop_on_soft_error=True,
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options=options,
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use_cropbox=False,
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)
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assert result == img
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assert img.exists()
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def _create_gradient_image(width: int, height: int) -> Image.Image:
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"""Create an image with multiple gradients to detect rasterization errors.
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The image contains:
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- Horizontal gradient from red to blue
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- Vertical gradient overlay from green to transparent
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- Diagonal bands for edge detection
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"""
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img = Image.new('RGB', (width, height))
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pixels = img.load()
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for y in range(height):
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for x in range(width):
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# Horizontal gradient: red to blue
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r = int(255 * (1 - x / width))
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b = int(255 * (x / width))
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# Vertical gradient: add green component
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g = int(255 * (y / height))
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# Add diagonal bands for edge detection
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band = ((x + y) // 20) % 2
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if band:
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r = min(255, r + 40)
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g = min(255, g + 40)
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b = min(255, b + 40)
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pixels[x, y] = (r, g, b)
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return img
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@pytest.fixture
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def pdf_with_nonstandard_boxes(tmp_path):
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"""Create a PDF with nonstandard MediaBox, TrimBox and CropBox."""
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# Create an image with gradients to detect rasterization errors
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img = _create_gradient_image(200, 300)
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img_bytes = BytesIO()
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img.save(img_bytes, format='PNG')
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img_bytes.seek(0)
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# Convert to PDF
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pdf_bytes = BytesIO()
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img2pdf.convert(
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img_bytes.read(),
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layout_fun=img2pdf.get_fixed_dpi_layout_fun((72, 72)),
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outputstream=pdf_bytes,
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**IMG2PDF_KWARGS,
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)
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pdf_bytes.seek(0)
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# Modify the PDF to have nonstandard boxes
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pdf_path = tmp_path / 'nonstandard_boxes.pdf'
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with pikepdf.open(pdf_bytes) as pdf:
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page = pdf.pages[0]
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# Set MediaBox larger than content
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page.MediaBox = pikepdf.Array([0, 0, 400, 500])
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# Set CropBox smaller - this is what viewers typically show
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page.CropBox = pikepdf.Array([50, 50, 350, 450])
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# Set TrimBox even smaller - indicates intended trim area
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page.TrimBox = pikepdf.Array([75, 75, 325, 425])
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pdf.save(pdf_path)
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return pdf_path
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@pytest.fixture
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def pdf_with_negative_mediabox(tmp_path):
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"""Create a PDF with MediaBox that has negative origin coordinates."""
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# Create an image with gradients to detect rasterization errors
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img = _create_gradient_image(200, 300)
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img_bytes = BytesIO()
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img.save(img_bytes, format='PNG')
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img_bytes.seek(0)
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pdf_bytes = BytesIO()
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img2pdf.convert(
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img_bytes.read(),
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layout_fun=img2pdf.get_fixed_dpi_layout_fun((72, 72)),
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outputstream=pdf_bytes,
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**IMG2PDF_KWARGS,
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)
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pdf_bytes.seek(0)
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pdf_path = tmp_path / 'negative_mediabox.pdf'
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with pikepdf.open(pdf_bytes) as pdf:
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page = pdf.pages[0]
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# MediaBox with negative origin (valid PDF but unusual)
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page.MediaBox = pikepdf.Array([-100, -100, 300, 400])
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pdf.save(pdf_path)
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return pdf_path
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class TestRasterizerWithNonStandardBoxes:
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"""Test rasterizers with PDFs having nonstandard MediaBox/TrimBox/CropBox."""
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def test_ghostscript_nonstandard_boxes(self, pdf_with_nonstandard_boxes, outpdf):
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"""Test Ghostscript handles nonstandard page boxes correctly."""
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check_ocrmypdf(
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pdf_with_nonstandard_boxes,
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outpdf,
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'--rasterizer',
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'ghostscript',
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'--plugin',
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'tests/plugins/tesseract_noop.py',
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)
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@pytest.mark.skipif(not PYPDFIUM_AVAILABLE, reason="pypdfium2 not installed")
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def test_pypdfium_nonstandard_boxes(self, pdf_with_nonstandard_boxes, outpdf):
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"""Test pypdfium handles nonstandard page boxes correctly."""
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check_ocrmypdf(
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pdf_with_nonstandard_boxes,
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outpdf,
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'--rasterizer',
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'pypdfium',
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'--plugin',
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'tests/plugins/tesseract_noop.py',
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)
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def test_ghostscript_negative_mediabox(self, pdf_with_negative_mediabox, outpdf):
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"""Test Ghostscript handles negative MediaBox origin."""
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check_ocrmypdf(
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pdf_with_negative_mediabox,
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outpdf,
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'--rasterizer',
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'ghostscript',
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'--plugin',
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'tests/plugins/tesseract_noop.py',
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)
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@pytest.mark.skipif(not PYPDFIUM_AVAILABLE, reason="pypdfium2 not installed")
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def test_pypdfium_negative_mediabox(self, pdf_with_negative_mediabox, outpdf):
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"""Test pypdfium handles negative MediaBox origin."""
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check_ocrmypdf(
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pdf_with_negative_mediabox,
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outpdf,
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'--rasterizer',
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'pypdfium',
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'--plugin',
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'tests/plugins/tesseract_noop.py',
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)
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def test_compare_rasterizers_nonstandard_boxes(
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self, pdf_with_nonstandard_boxes, tmp_path
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):
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"""Compare output dimensions between rasterizers for nonstandard boxes."""
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pm = get_plugin_manager([])
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options_gs = OcrOptions(
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input_file=pdf_with_nonstandard_boxes,
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output_file=tmp_path / 'out_gs.pdf',
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rasterizer='ghostscript',
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)
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img_gs = tmp_path / 'gs.png'
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pm.rasterize_pdf_page(
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input_file=pdf_with_nonstandard_boxes,
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output_file=img_gs,
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raster_device='png16m',
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raster_dpi=Resolution(72, 72),
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page_dpi=Resolution(72, 72),
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pageno=1,
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rotation=0,
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filter_vector=False,
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stop_on_soft_error=True,
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options=options_gs,
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use_cropbox=False,
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)
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with Image.open(img_gs) as im_gs:
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gs_size = im_gs.size
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if PYPDFIUM_AVAILABLE:
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options_pdfium = OcrOptions(
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input_file=pdf_with_nonstandard_boxes,
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output_file=tmp_path / 'out_pdfium.pdf',
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rasterizer='pypdfium',
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)
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img_pdfium = tmp_path / 'pdfium.png'
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pm.rasterize_pdf_page(
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input_file=pdf_with_nonstandard_boxes,
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output_file=img_pdfium,
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raster_device='png16m',
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raster_dpi=Resolution(72, 72),
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page_dpi=Resolution(72, 72),
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pageno=1,
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rotation=0,
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filter_vector=False,
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stop_on_soft_error=True,
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options=options_pdfium,
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use_cropbox=False,
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)
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with Image.open(img_pdfium) as im_pdfium:
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pdfium_size = im_pdfium.size
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# Both rasterizers should now produce MediaBox dimensions (400x500)
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# when use_cropbox=False (the default)
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assert gs_size == (400, 500), f"Ghostscript size: {gs_size}"
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assert pdfium_size == (400, 500), f"pypdfium size: {pdfium_size}"
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class TestRasterizerWithRotationAndBoxes:
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"""Test rasterizer + rotation + nonstandard boxes combinations."""
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# The pdf_with_nonstandard_boxes fixture creates a PDF with:
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# - MediaBox: [0, 0, 400, 500] → 400x500 points
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# - CropBox: [50, 50, 350, 450] → 300x400 points
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# - TrimBox: [75, 75, 325, 425] → 250x350 points
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#
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# With use_cropbox=False (default), both rasterizers use MediaBox
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MEDIABOX_WIDTH = 400
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MEDIABOX_HEIGHT = 500
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def _get_expected_size(self, rotation: int) -> tuple[int, int]:
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"""Get expected image dimensions after rotation."""
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width, height = self.MEDIABOX_WIDTH, self.MEDIABOX_HEIGHT
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if rotation in (0, 180):
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return (width, height)
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else: # 90, 270
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return (height, width)
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def test_ghostscript_rotation_dimensions(
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self, pdf_with_nonstandard_boxes, tmp_path
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):
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"""Test Ghostscript produces correct dimensions with rotation."""
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pm = get_plugin_manager([])
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options = OcrOptions(
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input_file=pdf_with_nonstandard_boxes,
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output_file=tmp_path / 'out.pdf',
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rasterizer='ghostscript',
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)
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for rotation in [0, 90, 180, 270]:
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img_path = tmp_path / f'gs_rot{rotation}.png'
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pm.rasterize_pdf_page(
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input_file=pdf_with_nonstandard_boxes,
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output_file=img_path,
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raster_device='png16m',
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raster_dpi=Resolution(72, 72),
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page_dpi=Resolution(72, 72),
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pageno=1,
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rotation=rotation,
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filter_vector=False,
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stop_on_soft_error=True,
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options=options,
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use_cropbox=False,
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)
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assert img_path.exists(), f"Failed to rasterize with rotation {rotation}"
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with Image.open(img_path) as img:
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expected = self._get_expected_size(rotation)
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# Allow small tolerance for rounding
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assert abs(img.size[0] - expected[0]) <= 2, (
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f"Width mismatch at {rotation}°: got {img.size[0]}, "
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f"expected {expected[0]}"
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)
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assert abs(img.size[1] - expected[1]) <= 2, (
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f"Height mismatch at {rotation}°: got {img.size[1]}, "
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f"expected {expected[1]}"
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)
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@pytest.mark.skipif(not PYPDFIUM_AVAILABLE, reason="pypdfium2 not installed")
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def test_pypdfium_rotation_dimensions(self, pdf_with_nonstandard_boxes, tmp_path):
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"""Test pypdfium produces correct dimensions with rotation."""
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pm = get_plugin_manager([])
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options = OcrOptions(
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input_file=pdf_with_nonstandard_boxes,
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output_file=tmp_path / 'out.pdf',
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rasterizer='pypdfium',
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)
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for rotation in [0, 90, 180, 270]:
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img_path = tmp_path / f'pdfium_rot{rotation}.png'
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pm.rasterize_pdf_page(
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input_file=pdf_with_nonstandard_boxes,
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output_file=img_path,
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raster_device='png16m',
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raster_dpi=Resolution(72, 72),
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page_dpi=Resolution(72, 72),
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pageno=1,
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rotation=rotation,
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filter_vector=False,
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stop_on_soft_error=True,
|
|
options=options,
|
|
use_cropbox=False,
|
|
)
|
|
assert img_path.exists(), f"Failed to rasterize with rotation {rotation}"
|
|
|
|
with Image.open(img_path) as img:
|
|
expected = self._get_expected_size(rotation)
|
|
# Allow small tolerance for rounding
|
|
assert abs(img.size[0] - expected[0]) <= 2, (
|
|
f"Width mismatch at {rotation}°: got {img.size[0]}, "
|
|
f"expected {expected[0]}"
|
|
)
|
|
assert abs(img.size[1] - expected[1]) <= 2, (
|
|
f"Height mismatch at {rotation}°: got {img.size[1]}, "
|
|
f"expected {expected[1]}"
|
|
)
|
|
|
|
@pytest.mark.skipif(not PYPDFIUM_AVAILABLE, reason="pypdfium2 not installed")
|
|
def test_rasterizers_produce_same_dimensions(
|
|
self, pdf_with_nonstandard_boxes, tmp_path
|
|
):
|
|
"""Verify ghostscript and pypdfium produce the same MediaBox dimensions.
|
|
|
|
With use_cropbox=False (the default), both rasterizers should render
|
|
to the MediaBox and produce identical dimensions.
|
|
"""
|
|
pm = get_plugin_manager([])
|
|
|
|
for rotation in [0, 90, 180, 270]:
|
|
# Rasterize with Ghostscript
|
|
gs_options = OcrOptions(
|
|
input_file=pdf_with_nonstandard_boxes,
|
|
output_file=tmp_path / 'out.pdf',
|
|
rasterizer='ghostscript',
|
|
)
|
|
gs_img_path = tmp_path / f'gs_cmp_rot{rotation}.png'
|
|
pm.rasterize_pdf_page(
|
|
input_file=pdf_with_nonstandard_boxes,
|
|
output_file=gs_img_path,
|
|
raster_device='png16m',
|
|
raster_dpi=Resolution(72, 72),
|
|
page_dpi=Resolution(72, 72),
|
|
pageno=1,
|
|
rotation=rotation,
|
|
filter_vector=False,
|
|
stop_on_soft_error=True,
|
|
options=gs_options,
|
|
use_cropbox=False,
|
|
)
|
|
|
|
# Rasterize with pypdfium
|
|
pdfium_options = OcrOptions(
|
|
input_file=pdf_with_nonstandard_boxes,
|
|
output_file=tmp_path / 'out.pdf',
|
|
rasterizer='pypdfium',
|
|
)
|
|
pdfium_img_path = tmp_path / f'pdfium_cmp_rot{rotation}.png'
|
|
pm.rasterize_pdf_page(
|
|
input_file=pdf_with_nonstandard_boxes,
|
|
output_file=pdfium_img_path,
|
|
raster_device='png16m',
|
|
raster_dpi=Resolution(72, 72),
|
|
page_dpi=Resolution(72, 72),
|
|
pageno=1,
|
|
rotation=rotation,
|
|
filter_vector=False,
|
|
stop_on_soft_error=True,
|
|
options=pdfium_options,
|
|
use_cropbox=False,
|
|
)
|
|
|
|
# Verify both produce the same MediaBox dimensions
|
|
with (
|
|
Image.open(gs_img_path) as gs_img,
|
|
Image.open(pdfium_img_path) as pdfium_img,
|
|
):
|
|
expected = self._get_expected_size(rotation)
|
|
|
|
assert abs(gs_img.size[0] - expected[0]) <= 2, (
|
|
f"GS width at {rotation}°: {gs_img.size[0]}, "
|
|
f"expected {expected[0]}"
|
|
)
|
|
assert abs(gs_img.size[1] - expected[1]) <= 2, (
|
|
f"GS height at {rotation}°: {gs_img.size[1]}, "
|
|
f"expected {expected[1]}"
|
|
)
|
|
assert abs(pdfium_img.size[0] - expected[0]) <= 2, (
|
|
f"pdfium width at {rotation}°: {pdfium_img.size[0]}, "
|
|
f"expected {expected[0]}"
|
|
)
|
|
assert abs(pdfium_img.size[1] - expected[1]) <= 2, (
|
|
f"pdfium height at {rotation}°: {pdfium_img.size[1]}, "
|
|
f"expected {expected[1]}"
|
|
)
|