fix(layout): detect and correct rotated page text (#10)

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PDFs that embed landscape content in portrait pages via a rotated text
matrix (e.g. [0, b, -b, 0, tx, ty] for 90° CCW) produced garbled output
because the layout engine assumed x=horizontal, y=vertical.

Track the dominant text direction from combined matrices during extraction.
When ≥67% of text operators are rotated, swap x↔y coordinates (with
y-negation for correct reading order) for all text items, rects, and lines.
Also estimate text widths from char count × font size since scale_x ≈ 0
for rotated text.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

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This commit is contained in:

Abimael Martell

2026-03-23 12:14:44 -07:00

committed by GitHub

co-authored by Claude Opus 4.6

parent aa387503c3

commit a199768c4e

3 changed files with 161 additions and 2 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

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tests/fixtures/tnagriculture_06_12.pdf

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