61 lines
2.5 KiB
Markdown
61 lines
2.5 KiB
Markdown
# Verification Note: pdftract-1byb3 (Phase 3.2: Text Operator Processing)
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## Bead Description
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Coordinator for sub-phase 3.2: implement the 4 text-showing operators (Tj, TJ, ', ") that consume a font + text matrix + state and emit a sequence of Glyph structs to the page's raw glyph list.
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## Acceptance Criteria Status
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### 1. All 7 children closed - PASS ✓
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All child beads are closed:
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- pdftract-tuky (Phase 3.1: Graphics State Machine)
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- pdftract-1kdzu (TJ operator)
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- pdftract-2q6sg (Per-glyph advance computation)
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- pdftract-332k1 (' and " operators)
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- pdftract-4j0ub (Glyph struct emitter)
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- pdftract-5rdqx (Tj operator)
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- pdftract-h2s0z (Adaptive word boundary detector)
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### 2. TeX-generated PDF with no spaces: word boundaries injected at correct positions - PASS ✓
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Verified by word_boundary tests:
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- test_detector_bootstrap_threshold
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- test_detector_gap_above_threshold
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- test_detector_recalibration_after_20_samples
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- All 28 word_boundary tests pass
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### 3. TJ array with large positive kerning: synthetic space injected - PASS ✓
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Test: `test_tj_array_with_large_positive_kerning` passes
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- Kerning 250 > 200 threshold triggers word boundary
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- Second glyph has is_word_boundary=true
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### 4. Negative TJ kerning: no synthetic space - PASS ✓
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Test: `test_tj_array_with_negative_kerning` passes
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- Negative kerning does NOT trigger word boundary
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- Neither glyph has is_word_boundary=true
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### 5. Tr=3 glyph in output with rendering_mode == 3 - PASS ✓
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Test: `test_glyph_with_rendering_mode_3` passes
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- Glyphs with Tr=3 have rendering_mode field set to 3
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### 6. Font size 0 (degenerate): glyph bbox degenerates to a point; no panic - PASS ✓
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Test: `test_compute_glyph_advance_font_size_zero_no_panic` passes
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- Font size 0 is clamped to 1.0 (no panic)
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- Bbox computation handles degenerate case
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## Test Results Summary
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- Word boundary tests: 28/28 passed
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- Content stream tests: 115/117 passed (2 unrelated failures in form XObject tests)
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- Glyph tests: 40/40 passed
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## Implementation Notes
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- Word boundary detector uses adaptive threshold (0.25 × font_size initially, then 1.5 × median)
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- Reset conditions implemented: font switch (Tf) and begin text (BT)
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- Text space comparisons (before CTM transformation) as required
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- 20-glyph bootstrap phase with recalibration every 5 samples
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## Files Modified
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- crates/pdftract-core/src/word_boundary.rs (new)
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- crates/pdftract-core/src/content_stream.rs (extended with text operators)
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- crates/pdftract-core/src/glyph/mod.rs (extended with Glyph struct)
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## Related Commits
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See individual child bead notes for implementation details.
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