# PDF Layout Restoration and Preservation

## Problem
Currently, the PDF generation from both OCR and Direct extraction tracks produces documents that are **severely degraded compared to the original**, with multiple critical issues:

### 1. Images Never Appear
- **OCR track**: `pp_structure_enhanced._save_image()` is an empty implementation (lines 262, 414), so detected images are never saved
- **Direct track**: Image paths are saved as `content["saved_path"]` but converter looks for `content.get("path")`, causing a mismatch
- **Result**: All PDFs are text-only, with no images whatsoever

### 2. Tables Never Render
- Table elements use fake `table_*.png` references that don't exist as actual files
- `draw_table_region()` tries to find these non-existent images to get bbox coordinates
- When images aren't found, table rendering is skipped entirely
- **Result**: No tables appear in generated PDFs

### 3. Text Layout is Broken
- All text uses single `drawString()` call with entire block as one line
- No line breaks, paragraph alignment, or text styling preserved
- Direct track extracts `StyleInfo` but it's completely ignored during PDF generation
- **Result**: Text appears as unformatted blocks at wrong positions

### 4. Information Loss in Conversion
- Direct track data gets converted to legacy OCR format, losing rich metadata
- Span-level information (fonts, colors, styles) is discarded
- Precise positioning information is reduced to simple bboxes

## Solution
Implement proper layout preservation for PDF generation:

1. **Fix image handling**: Actually save images and use correct path references
2. **Fix table rendering**: Use element's own bbox instead of looking for fake images
3. **Preserve text formatting**: Use StyleInfo and span-level data for accurate rendering
4. **Track-specific rendering**: Different approaches for OCR vs Direct tracks

## Impact
- **User Experience**: Output PDFs will actually be usable and readable
- **Functionality**: Tables and images will finally appear in outputs
- **Quality**: Direct track PDFs will closely match original formatting
- **Performance**: No negative impact, possibly faster by avoiding unnecessary conversions

## Tasks
- Fix image saving and path references (Critical)
- Fix table rendering using actual bbox data (Critical)
- Implement track-specific PDF generation (Important)
- Preserve text styling and formatting (Important)
- Add span-level text rendering (Nice-to-have)

## Deltas

### result-export
```delta
+ image_handling: Proper image saving and path resolution
+ table_rendering: Direct bbox usage for table positioning
+ text_formatting: StyleInfo preservation and application
+ track_specific_rendering: OCR vs Direct track differentiation
```