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feat: add OCR track alignment support and spacing_after analysis

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Complete text alignment parity between OCR and Direct tracks:

**OCR Track Alignment Support (Task 5.3.5)**
- Extract alignment from region style (StyleInfo or dict)
- Support left/right/center/justify alignment in draw_text_region
- Calculate line_x position based on alignment setting:
  - Left: line_x = pdf_x (default)
  - Center: line_x = pdf_x + (bbox_width - text_width) / 2
  - Right: line_x = pdf_x + bbox_width - text_width
  - Justify: word spacing distribution (except last line)
- Lines 1179-1247 in pdf_generator_service.py
- OCR track now has feature parity with Direct track for alignment

**Enhanced spacing_after Handling (Task 5.2.4-5.2.5)**
- Calculate actual text height: len(lines) * line_height
- Compute bbox_bottom_margin to show implicit spacing
- Add detailed logging with actual_height and bbox_bottom_margin
- Document that spacing_after is inherent in bbox-based layout
- If text is shorter than bbox, remaining space acts as spacing
- Lines 1680-1689 in pdf_generator_service.py

**Technical Details**
- Both tracks now support identical alignment modes
- spacing_after is implicitly present in element positioning
- bbox_bottom_margin = bbox_height - actual_text_height - spacing_before
- This shows how much space remains below the text (implicit spacing_after)

**Modified Files**
- backend/app/services/pdf_generator_service.py
  - Lines 1179-1185: Alignment extraction for OCR track
  - Lines 1222-1247: OCR track alignment calculation and rendering
  - Lines 1680-1689: spacing_after analysis with bbox_bottom_margin
- openspec/changes/pdf-layout-restoration/tasks.md
  - Added 5.2.5: bbox_bottom_margin calculation
  - Added 5.3.5: OCR track alignment support

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
egg
2025-11-24 08:35:01 +08:00
parent 93bd9f5fee
commit 8ba61f51b3
2 changed files with 50 additions and 5 deletions
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6
openspec/changes/pdf-layout-restoration/tasks.md
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@@ -81,17 +81,19 @@
- [x] 5.1.1 Split text content by newlines (text.split('\n'))
- [x] 5.1.2 Calculate line height from font size (font_size * 1.2)
- [x] 5.1.3 Render each line with proper spacing (line_y = pdf_y - i * line_height)
- [x] 5.1.4 Add OCR track support in draw_text_region (lines 1191-1218)
- [x] 5.1.4 Add OCR track support in draw_text_region (lines 1199-1254)
- [x] 5.2 Add paragraph handling
- [x] 5.2.1 Detect paragraph boundaries (via element.type PARAGRAPH)
- [x] 5.2.2 Apply paragraph spacing (spacing_before/spacing_after from metadata)
- [x] 5.2.3 Handle indentation (indent/first_line_indent from metadata)
- [x] 5.2.4 Record spacing_after for debugging (included in logs)
- [x] 5.2.4 Record spacing_after with actual text height analysis (lines 1680-1689)
- [x] 5.2.5 Calculate bbox_bottom_margin to show implicit spacing
- [x] 5.3 Implement text alignment
- [x] 5.3.1 Support left/right/center/justify (from StyleInfo.alignment)
- [x] 5.3.2 Calculate positioning based on alignment (line_x calculation)
- [x] 5.3.3 Apply to each text block (per-line alignment in _draw_text_element_direct)
- [x] 5.3.4 Justify alignment with word spacing distribution
- [x] 5.3.5 Add OCR track alignment support (extract from style, lines 1179-1247)
### 6. List Formatting
- [ ] 6.1 Detect list elements