e1e97c54cf
Address Phase 3 accuracy issues identified in review: **Issue 1: Invalid OCR Track Alignment Code** - Removed alignment extraction from region style (lines 1179-1185) - Removed alignment-based positioning logic (lines 1215-1240) - Problem: OCR track has no StyleInfo (extracted from images without style data) - Result: Alignment code was non-functional, always defaulted to left - Solution: Simplified to explicit left-aligned rendering for OCR track **Issue 2: Misleading Task Completion Markers** - Updated 5.1: Clarified both tracks support line-by-line rendering - Direct: _draw_text_element_direct (lines 1549-1693) - OCR: draw_text_region (lines 1113-1270, simplified) - Updated 5.2: Marked as "Direct track only" - spacing_before: Applied (adjusts Y position) - spacing_after: Implicit in bbox-based layout (recorded for analysis) - indent/first_line_indent: Direct track only - OCR: No paragraph handling - Updated 5.3: Marked as "Direct track only" - Direct: Supports left/right/center/justify alignment - OCR: Left-aligned only (no StyleInfo available) **Technical Clarifications** - spacing_after cannot be "applied" in bbox-based layout - It is already reflected in element positions (bbox spacing) - bbox_bottom_margin shows the implicit spacing_after value - OCR track uses simplified rendering (design decision per design.md) **Modified Files** - backend/app/services/pdf_generator_service.py - Removed lines 1179-1185: Invalid alignment extraction - Removed lines 1215-1240: Invalid alignment logic - Added comments clarifying OCR track limitations - openspec/changes/pdf-layout-restoration/tasks.md - Added "(Direct track only)" markers to 5.2 and 5.3 - Changed 5.3.5 from "Add OCR track alignment support" to "OCR track: left-aligned only" - Added 5.2.6 to note OCR has no paragraph handling 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
189 lines
8.1 KiB
Markdown
189 lines
8.1 KiB
Markdown
# Implementation Tasks: PDF Layout Restoration
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## Phase 1: Critical Fixes (P0 - Immediate)
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### 1. Fix Image Handling
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- [x] 1.1 Implement `_save_image()` in pp_structure_enhanced.py
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- [x] 1.1.1 Create imgs subdirectory in result_dir
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- [x] 1.1.2 Handle both file path and numpy array inputs
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- [x] 1.1.3 Save with element_id as filename
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- [x] 1.1.4 Return relative path for reference
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- [x] 1.1.5 Add error handling and logging
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- [x] 1.2 Fix path resolution in pdf_generator_service.py
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- [x] 1.2.1 Create `_get_image_path()` helper with fallback logic
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- [x] 1.2.2 Check saved_path, path, image_path keys
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- [x] 1.2.3 Check metadata for path
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- [x] 1.2.4 Update convert_unified_document_to_ocr_data to use helper
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- [ ] 1.3 Test image rendering
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- [ ] 1.3.1 Test with OCR track document
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- [ ] 1.3.2 Test with Direct track document
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- [ ] 1.3.3 Verify images appear in PDF output
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### 2. Fix Table Rendering
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- [x] 2.1 Remove dependency on fake image references
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- [x] 2.1.1 Stop creating fake table_*.png references (changed to None)
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- [x] 2.1.2 Remove image lookup fallback in draw_table_region
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- [x] 2.2 Use direct bbox from table element
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- [x] 2.2.1 Get bbox from table_element.get("bbox")
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- [x] 2.2.2 Fallback to bbox_polygon if needed
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- [x] 2.2.3 Implement _polygon_to_bbox converter (inline conversion implemented)
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- [x] 2.3 Fix table HTML rendering
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- [x] 2.3.1 Parse HTML content from table element
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- [x] 2.3.2 Position table using normalized bbox
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- [x] 2.3.3 Render with proper dimensions
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- [ ] 2.4 Test table rendering
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- [ ] 2.4.1 Test simple tables
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- [ ] 2.4.2 Test complex multi-column tables
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- [ ] 2.4.3 Test with both tracks
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## Phase 2: Basic Style Preservation (P1 - Week 1)
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### 3. Implement Style Application System
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- [x] 3.1 Create font mapping system
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- [x] 3.1.1 Define FONT_MAPPING dictionary (20 common fonts mapped)
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- [x] 3.1.2 Map common fonts to PDF standard fonts (Helvetica/Times/Courier)
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- [x] 3.1.3 Add fallback to Helvetica for unknown fonts (with partial matching)
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- [x] 3.2 Implement _apply_text_style() method
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- [x] 3.2.1 Extract font family from StyleInfo (object and dict support)
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- [x] 3.2.2 Handle bold/italic flags (compound variants like BoldOblique)
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- [x] 3.2.3 Apply font size (with default fallback)
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- [x] 3.2.4 Apply text color (using _parse_color)
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- [x] 3.2.5 Handle errors gracefully (try-except with fallback to defaults)
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- [x] 3.3 Create color parsing utilities
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- [x] 3.3.1 Parse hex colors (#RRGGBB and #RGB)
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- [x] 3.3.2 Parse RGB tuples (0-255 and 0-1 normalization)
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- [x] 3.3.3 Convert to PDF color space (0-1 range for ReportLab)
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### 4. Track-Specific Rendering
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- [x] 4.1 Add track detection in generate_from_unified_document
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- [x] 4.1.1 Check unified_doc.metadata.processing_track (object and dict support)
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- [x] 4.1.2 Route to _generate_direct_track_pdf or _generate_ocr_track_pdf
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- [x] 4.2 Implement _generate_direct_track_pdf
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- [x] 4.2.1 Process each page directly from UnifiedDocument (no legacy conversion)
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- [x] 4.2.2 Apply StyleInfo to text elements (_draw_text_element_direct)
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- [x] 4.2.3 Use precise positioning from element.bbox
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- [x] 4.2.4 Preserve line breaks (split on \n, render multi-line)
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- [x] 4.2.5 Implement _draw_text_element_direct with line break handling
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- [x] 4.2.6 Implement _draw_table_element_direct for tables
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- [x] 4.2.7 Implement _draw_image_element_direct for images
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- [x] 4.3 Implement _generate_ocr_track_pdf
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- [x] 4.3.1 Use legacy OCR data conversion (convert_unified_document_to_ocr_data)
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- [x] 4.3.2 Route to existing _generate_pdf_from_data pipeline
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- [x] 4.3.3 Maintain backward compatibility with OCR track behavior
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- [ ] 4.4 Test track-specific rendering
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- [ ] 4.4.1 Compare Direct track with original
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- [ ] 4.4.2 Verify OCR track maintains quality
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## Phase 3: Advanced Layout (P2 - Week 2)
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### 5. Enhanced Text Rendering
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- [x] 5.1 Implement line-by-line rendering (both tracks)
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- [x] 5.1.1 Split text content by newlines (text.split('\n'))
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- [x] 5.1.2 Calculate line height from font size (font_size * 1.2)
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- [x] 5.1.3 Render each line with proper spacing (line_y = pdf_y - i * line_height)
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- [x] 5.1.4 Direct track: _draw_text_element_direct (lines 1549-1693)
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- [x] 5.1.5 OCR track: draw_text_region (lines 1113-1270, simplified)
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- [x] 5.2 Add paragraph handling (Direct track only)
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- [x] 5.2.1 Detect paragraph boundaries (via element.type PARAGRAPH)
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- [x] 5.2.2 Apply spacing_before from metadata (line 1576, adjusts Y position)
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- [x] 5.2.3 Handle indentation (indent/first_line_indent from metadata, lines 1564-1565)
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- [x] 5.2.4 Record spacing_after for analysis (lines 1680-1689)
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- [x] 5.2.5 Note: spacing_after is implicit in bbox-based layout (bbox_bottom_margin)
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- [x] 5.2.6 OCR track: no paragraph handling (simple left-aligned rendering)
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- [x] 5.3 Implement text alignment (Direct track only)
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- [x] 5.3.1 Support left/right/center/justify (from StyleInfo.alignment)
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- [x] 5.3.2 Calculate positioning based on alignment (line_x calculation)
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- [x] 5.3.3 Apply to each text block (per-line alignment in _draw_text_element_direct)
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- [x] 5.3.4 Justify alignment with word spacing distribution
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- [x] 5.3.5 OCR track: left-aligned only (no StyleInfo available)
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### 6. List Formatting
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- [ ] 6.1 Detect list elements
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- [ ] 6.1.1 Identify list items from metadata
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- [ ] 6.1.2 Determine list type (ordered/unordered)
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- [ ] 6.1.3 Extract indent level
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- [ ] 6.2 Render lists with proper formatting
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- [ ] 6.2.1 Add bullets/numbers
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- [ ] 6.2.2 Apply indentation
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- [ ] 6.2.3 Maintain list spacing
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### 7. Span-Level Rendering (Advanced)
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- [ ] 7.1 Extract span information from Direct track
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- [ ] 7.1.1 Parse children elements for spans
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- [ ] 7.1.2 Get per-span styling
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- [ ] 7.1.3 Track position within line
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- [ ] 7.2 Render mixed-style lines
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- [ ] 7.2.1 Switch styles mid-line
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- [ ] 7.2.2 Handle inline formatting
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- [ ] 7.2.3 Preserve exact positioning
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## Phase 4: Testing and Optimization (P2 - Week 3)
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### 8. Comprehensive Testing
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- [ ] 8.1 Create test suite for layout preservation
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- [ ] 8.1.1 Unit tests for each component
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- [ ] 8.1.2 Integration tests for full pipeline
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- [ ] 8.1.3 Visual regression tests
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- [ ] 8.2 Test with various document types
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- [ ] 8.2.1 Scientific papers (complex layout)
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- [ ] 8.2.2 Business documents (tables/charts)
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- [ ] 8.2.3 Books (chapters/paragraphs)
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- [ ] 8.2.4 Forms (precise positioning)
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- [ ] 8.3 Performance testing
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- [ ] 8.3.1 Measure generation time
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- [ ] 8.3.2 Profile memory usage
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- [ ] 8.3.3 Identify bottlenecks
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### 9. Performance Optimization
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- [ ] 9.1 Implement caching
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- [ ] 9.1.1 Cache font metrics
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- [ ] 9.1.2 Cache parsed styles
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- [ ] 9.1.3 Reuse computed layouts
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- [ ] 9.2 Optimize image handling
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- [ ] 9.2.1 Lazy load images
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- [ ] 9.2.2 Compress when appropriate
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- [ ] 9.2.3 Stream large images
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- [ ] 9.3 Batch operations
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- [ ] 9.3.1 Group similar rendering ops
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- [ ] 9.3.2 Minimize context switches
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- [ ] 9.3.3 Use efficient data structures
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### 10. Documentation and Deployment
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- [ ] 10.1 Update API documentation
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- [ ] 10.1.1 Document new rendering capabilities
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- [ ] 10.1.2 Add examples of improved output
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- [ ] 10.1.3 Note performance characteristics
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- [ ] 10.2 Create migration guide
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- [ ] 10.2.1 Explain improvements
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- [ ] 10.2.2 Note any breaking changes
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- [ ] 10.2.3 Provide rollback instructions
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- [ ] 10.3 Deployment preparation
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- [ ] 10.3.1 Feature flag setup
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- [ ] 10.3.2 Monitoring metrics
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- [ ] 10.3.3 Rollback plan
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## Success Criteria
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### Must Have (Phase 1)
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- [x] Images appear in generated PDFs
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- [x] Tables render with correct layout
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- [x] No regression in existing functionality
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### Should Have (Phase 2)
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- [ ] Text styling preserved in Direct track
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- [ ] Font sizes and colors applied
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- [ ] Line breaks maintained
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### Nice to Have (Phase 3-4)
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- [ ] Paragraph formatting
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- [ ] List rendering
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- [ ] Span-level styling
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- [ ] <10% performance overhead
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## Timeline
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- **Week 0**: Phase 1 - Critical fixes (images, tables)
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- **Week 1**: Phase 2 - Basic style preservation
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- **Week 2**: Phase 3 - Advanced layout features
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- **Week 3**: Phase 4 - Testing and optimization
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- **Week 4**: Review, documentation, and deployment |