42 lines
2.0 KiB
Markdown
42 lines
2.0 KiB
Markdown
# Change: Reflow Layout PDF Export for All Tracks
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## Why
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When generating translated PDFs, text often doesn't fit within original bounding boxes due to language expansion/contraction differences. Additionally, users may want a readable flowing document format even without translation.
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**Example from task c79df0ad-f9a6-4c04-8139-13eaef25fa83:**
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- Original Chinese: "华天科技（宝鸡）有限公司设备版块报价单" (19 characters)
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- Translated English: "Huatian Technology (Baoji) Co., Ltd. Equipment Division Quotation" (65+ characters)
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- Same bounding box: 703×111 pixels
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- Current result: Font reduced to minimum (3pt), text unreadable
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## What Changes
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- **NEW**: Add reflow layout PDF generation for both OCR and Direct tracks
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- Preserve semantic structure (headings, tables, lists) in reflow mode
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- Use consistent, readable font sizes (12pt body, 16pt headings)
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- Embed images inline within flowing content
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- **IMPORTANT**: Original layout preservation PDF generation remains unchanged
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- Support both tracks with proper reading order:
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- **OCR track**: Use existing `reading_order` array from PP-StructureV3
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- **Direct track**: Use PyMuPDF's implicit order (with option for column detection)
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- **FIX**: Remove outdated MADLAD-400 references from frontend (now uses Dify cloud translation)
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## Download Options
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| Scenario | Layout PDF | Reflow PDF |
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|----------|------------|------------|
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| **Without Translation** | Available | Available (NEW) |
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| **With Translation** | - | Available (single option, unchanged) |
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## Impact
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- Affected specs: `specs/result-export/spec.md`
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- Affected code:
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- `backend/app/services/pdf_generator_service.py` - add reflow generation method
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- `backend/app/routers/tasks.py` - add reflow PDF download endpoint
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- `backend/app/routers/translate.py` - use reflow mode for translated PDFs
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- `frontend/src/pages/TaskDetailPage.tsx`:
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- Add "Download Reflow PDF" button for original documents
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- Remove MADLAD-400 badge and outdated description text
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