feat: unify Direct Track PDF rendering and simplify export options
Backend changes: - Apply background image + invisible text layer to all Direct Track PDFs - Add CHART to regions_to_avoid for text extraction - Improve visual fidelity for native PDFs and Office documents Frontend changes: - Remove JSON, UnifiedDocument, Markdown download buttons - Simplify to 2-column layout with only Layout PDF and Reflow PDF - Remove translation JSON download and Layout PDF option - Keep only Reflow PDF for translated document downloads - Clean up unused imports (FileJson, Database, FileOutput) Archives two OpenSpec proposals: - unify-direct-track-pdf-rendering - simplify-frontend-export-options 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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# Change: Simplify Frontend Export Options
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## Why
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The current frontend has accumulated export options that are no longer needed or rarely used. Following the "Simple OCR" architecture change, we need to streamline the user interface by:
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1. Removing redundant export formats that add complexity without significant user value
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2. Focusing on the most useful output formats (PDF)
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3. Simplifying the translation download options
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## What Changes
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### TaskDetailPage Changes
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**Download Options - Remove:**
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- JSON download button
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- UnifiedDocument (統一格式) download button
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- Markdown download button
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**Download Options - Keep:**
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- 版面 PDF (Layout PDF)
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- 流式 PDF (Reflow PDF)
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**Translation Options - Remove:**
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- Download translation JSON button
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- Download translated Layout PDF option
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**Translation Options - Keep:**
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- Download translated Reflow PDF (流式 PDF)
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**Statistics Section - Keep All:**
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- 處理時間 (Processing time)
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- 頁數 (Page count)
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- 文本區域 (Text regions)
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- 表格 (Tables)
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- 圖片 (Images)
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- 平均置信度 (Average confidence)
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### Components - Keep All
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- LayoutModelSelector
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- PreprocessingSettings
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- PreprocessingPreview
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- ProcessingTrackSelector
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### Pages to Review (Out of Scope)
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- SettingsPage (Export rules) - May need separate review
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- ResultsPage - May be unused, needs verification
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## Impact
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- **Affected files**: `frontend/src/pages/TaskDetailPage.tsx`
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- **User experience**: Simplified interface with fewer but more relevant options
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- **Backend**: No changes required (endpoints remain available for API users)
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## Migration
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- No data migration required
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- Frontend-only changes
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- Backend endpoints remain unchanged for API compatibility
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## MODIFIED Requirements
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### Requirement: Export Interface
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The Export interface in TaskDetailPage SHALL provide streamlined download options focusing on PDF formats.
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#### Scenario: Download options for completed tasks
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- **WHEN** viewing a completed task in TaskDetailPage
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- **THEN** the download section SHALL display only two buttons: "版面 PDF" and "流式 PDF"
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- **AND** JSON, UnifiedDocument, and Markdown download buttons SHALL NOT be displayed
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- **AND** the download grid SHALL use a 2-column layout
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#### Scenario: Translation download options
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- **WHEN** viewing completed translations in TaskDetailPage
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- **THEN** each translation item SHALL display only a "流式 PDF" download button
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- **AND** translation JSON download button SHALL NOT be displayed
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- **AND** Layout PDF option for translations SHALL NOT be displayed
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- **AND** delete translation button SHALL remain available
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#### Scenario: Backend API remains unchanged
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- **WHEN** external clients call download endpoints directly
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- **THEN** JSON, Markdown, and UnifiedDocument endpoints SHALL still function
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- **AND** translated Layout PDF endpoint SHALL still function
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- **AND** no backend changes are required for this frontend simplification
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# Tasks: Simplify Frontend Export Options
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## 1. TaskDetailPage - Download Section
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- [x] 1.1 Remove JSON download button
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- File: `frontend/src/pages/TaskDetailPage.tsx`
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- Remove: Button with `handleDownloadJSON` onClick
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- Remove: `handleDownloadJSON` function (lines 245-261)
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- [x] 1.2 Remove UnifiedDocument download button
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- File: `frontend/src/pages/TaskDetailPage.tsx`
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- Remove: Button with `handleDownloadUnified` onClick
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- Remove: `handleDownloadUnified` function (lines 263-279)
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- [x] 1.3 Remove Markdown download button
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- File: `frontend/src/pages/TaskDetailPage.tsx`
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- Remove: Button with `handleDownloadMarkdown` onClick
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- Remove: `handleDownloadMarkdown` function (lines 227-243)
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- [x] 1.4 Update download grid layout
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- File: `frontend/src/pages/TaskDetailPage.tsx`
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- Change: Grid from 5 columns to 2 columns (only Layout PDF and Reflow PDF)
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- Update: `grid-cols-2 md:grid-cols-5` → `grid-cols-2`
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## 2. TaskDetailPage - Translation Section
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- [x] 2.1 Remove translation JSON download button
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- File: `frontend/src/pages/TaskDetailPage.tsx`
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- Remove: Button with `handleDownloadTranslation` onClick in translation list
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- Remove: `handleDownloadTranslation` function (lines 322-338)
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- [x] 2.2 Simplify translated PDF download (remove Layout option)
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- File: `frontend/src/pages/TaskDetailPage.tsx`
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- Change: Remove Select dropdown for PDF format
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- Change: Replace with single "流式 PDF" download button
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- Keep: `handleDownloadTranslatedPdf` function (always use 'reflow' format)
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## 3. Cleanup - Remove Unused Imports
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- [x] 3.1 Remove unused Lucide icons
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- File: `frontend/src/pages/TaskDetailPage.tsx`
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- Removed: `FileJson`, `Database`, `FileOutput`
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- Keep: Icons still in use
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## 4. Verification
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- [ ] 4.1 Verify Layout PDF download works
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- Test: Click "版面 PDF" button
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- Expected: PDF downloads with preserved layout
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- [ ] 4.2 Verify Reflow PDF download works
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- Test: Click "流式 PDF" button
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- Expected: PDF downloads with flowing text
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- [ ] 4.3 Verify translated Reflow PDF download works
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- Test: Complete a translation, then click download
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- Expected: Translated PDF downloads in reflow format
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# Design: Unify Direct Track PDF Rendering
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## Context
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The Tool_OCR system generates "Layout PDF" files that preserve the original document appearance while maintaining extractable text. Currently, Direct Track (editable PDFs and Office documents) uses element-by-element rendering, which causes:
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- Z-order conflicts (text behind images)
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- Missing vector graphics (chart bars, gradients)
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- White text becoming invisible on dark backgrounds
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## Goals / Non-Goals
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### Goals
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- Visual fidelity: Layout PDF matches source document exactly
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- Text extractability: All text remains searchable/selectable for translation
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- Unified logic: Same rendering approach for all Direct Track documents
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- Chart handling: Chart-internal text excluded from translation layer
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### Non-Goals
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- Editable text in Layout PDF (translation creates separate reflow PDF)
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- Reducing file size (trade-off for visual fidelity)
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- OCR Track changes (only affects Direct Track)
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## Decisions
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### Decision 1: Use Background Image + Invisible Text Layer
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**What**: Render each source PDF page as a full-page background image, then overlay invisible text.
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**Why**:
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- Preserves ALL visual content (vector graphics, gradients, complex layouts)
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- Invisible text (PDF Rendering Mode 3) allows text selection without visual overlap
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- Simplifies z-order handling (just one image layer + one text layer)
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**Implementation**:
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```python
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# Render source page as background
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mat = fitz.Matrix(2.0, 2.0) # 2x resolution
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pix = source_page.get_pixmap(matrix=mat, alpha=False)
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pdf_canvas.drawImage(bg_img, 0, 0, width=page_width, height=page_height)
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# Set invisible text mode
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pdf_canvas._code.append('3 Tr') # Text render mode: invisible
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# Draw text elements (invisible but selectable)
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for elem in text_elements:
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if not is_inside_chart_region(elem):
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draw_text_element(elem)
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pdf_canvas._code.append('0 Tr') # Reset to normal
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```
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### Decision 2: Add CHART to regions_to_avoid
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**What**: Chart-internal text elements are excluded from the invisible text layer.
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**Why**:
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- Chart axis labels, legends already visible in background image
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- These texts typically don't need translation
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- Prevents duplicate text extraction for translation
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**Implementation**:
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```python
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# In element classification loop
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if element.type == ElementType.CHART:
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image_elements.append(element)
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regions_to_avoid.append(element) # Exclude chart region from text layer
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```
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### Decision 3: Apply to ALL Direct Track Documents
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**What**: Use background image rendering for both Office documents and native PDFs.
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**Why**:
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- Consistent handling eliminates edge cases
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- Chart text overlap affects both document types
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- Office detection (LibreOffice producer) is unreliable for some PDFs
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**Detection logic removed**:
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```python
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# OLD: Only for Office documents
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is_office_document = 'LibreOffice' in producer or filename.endswith('.pptx')
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# NEW: All Direct Track uses background rendering
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if self.current_processing_track == ProcessingTrack.DIRECT:
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render_background_image()
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```
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## Architecture
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```
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┌─────────────────────────────────────────────────────────────┐
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│ PDF Generation Flow │
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├─────────────────────────────────────────────────────────────┤
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│ │
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│ Source PDF ──► PyMuPDF ──► Page Pixmap (2x) ──► Background │
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│ │ │
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│ ▼ │
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│ Extract Text ──► Filter Chart Regions │
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│ │ │
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│ ▼ │
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│ Invisible Text Layer (Mode 3) ──► Overlay │
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│ │
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│ Result: Background Image + Invisible Searchable Text │
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│ │
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└─────────────────────────────────────────────────────────────┘
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```
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## Risks / Trade-offs
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| Risk | Impact | Mitigation |
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|------|--------|------------|
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| Larger file size (~2MB/page) | Storage, download time | Accept trade-off for visual fidelity |
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| Slightly slower generation | User wait time | Acceptable for quality improvement |
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| Chart text not translatable | Feature limitation | Document as expected behavior |
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| Source PDF required | Can't regenerate without source | Store source PDF reference in task |
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## File Size Estimation
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| Document | Pages | Current Size | New Size (est.) |
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|----------|-------|--------------|-----------------|
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| PPT (25 pages) | 25 | ~1.5 MB | ~43 MB |
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| PDF (3 pages) | 3 | ~68 KB | ~6 MB |
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## Open Questions
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1. Should we provide a "lightweight" option that skips background rendering for simple PDFs?
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- **Decision**: No, keep unified approach for consistency
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2. Should chart text be optionally included in translation?
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- **Decision**: No, chart labels rarely need translation and would require complex masking
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# Change: Unify Direct Track PDF Rendering with Background Image + Invisible Text Layer
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## Why
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Direct Track PDF generation currently has visual rendering issues:
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1. **Chart text overlap**: Text elements extracted from PDF text layer (e.g., "Temperature, °C") overlap with chart images
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2. **Z-order problems**: White text on dark backgrounds becomes invisible when rendered incorrectly
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3. **Office document issues**: PPT/DOC/XLS converted PDFs lose visual fidelity (vector graphics, gradients)
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The root cause is that Direct Track tries to render individual elements (text, images, tables) separately, which leads to z-order conflicts and missing visual content.
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## What Changes
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### Backend Changes
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1. **Unified Background Image Rendering for All Direct Track**
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- Render source PDF page as full-page background image (2x resolution)
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- Draw invisible text layer on top (PDF Text Rendering Mode 3)
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- Text remains searchable/extractable but doesn't visually overlap
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2. **Chart Region Exclusion**
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- Add `CHART` element type to `regions_to_avoid`
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- Chart-internal text (axis labels, legends) will NOT be in invisible text layer
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- These texts are already visible in the background image and don't need translation
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3. **Skip Element Rendering When Background Exists**
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- When background image is rendered, skip individual image/table rendering
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- Only draw invisible text layer for searchability and translation extraction
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### Frontend Considerations
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1. **No UI Changes Required for Layout PDF**
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- Layout PDF generation is automatic, no user options needed
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- Visual output will match source PDF exactly
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2. **Translation Flow Clarification**
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- Layout PDF: Background image + invisible text (for preview)
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- Translated PDF: Reflow layout with real visible text (page-by-page)
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- Chart text excluded from translation (already in background image)
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## Impact
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- **Affected specs**: document-processing, result-export, translation
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- **Affected code**:
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- `backend/app/services/pdf_generator_service.py` (main changes)
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- `backend/app/services/direct_extraction_engine.py` (chart detection)
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- **File size**: Output PDF will be larger due to embedded page images (~2MB per page at 2x resolution)
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- **Processing time**: Slight increase for page rendering
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## Migration
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- No database changes required
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- No API changes required
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- Existing tasks can be re-exported with new PDF generation logic
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## ADDED Requirements
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### Requirement: Direct Track Background Image Rendering
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The system SHALL render Direct Track PDF output using a full-page background image with an invisible text overlay to preserve visual fidelity while maintaining text extractability.
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#### Scenario: Render Direct Track PDF with background image
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- **WHEN** generating Layout PDF for a Direct Track document
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- **THEN** the system SHALL render each source PDF page as a full-page background image at 2x resolution
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- **AND** overlay invisible text elements using PDF Text Rendering Mode 3
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- **AND** the invisible text SHALL be positioned at original coordinates for accurate selection
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#### Scenario: Handle Office documents (PPT, DOC, XLS)
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- **WHEN** processing an Office document converted to PDF
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- **THEN** the system SHALL use the same background image + invisible text approach
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- **AND** preserve all visual elements including vector graphics, gradients, and complex layouts
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- **AND** the converted PDF in result directory SHALL be used as background source
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#### Scenario: Handle native editable PDFs
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- **WHEN** processing a native PDF through Direct Track
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- **THEN** the system SHALL use the source PDF for background rendering
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- **AND** apply the same invisible text overlay approach
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- **AND** chart regions SHALL be excluded from the text layer
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### Requirement: Chart Region Text Exclusion
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The system SHALL exclude text elements within chart regions from the invisible text layer to prevent duplicate content and unnecessary translation.
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#### Scenario: Detect chart regions
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- **WHEN** classifying page elements for Direct Track
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- **THEN** the system SHALL identify elements with type CHART
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- **AND** add chart bounding boxes to regions_to_avoid list
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#### Scenario: Exclude chart-internal text from invisible layer
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- **WHEN** rendering invisible text layer
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- **THEN** the system SHALL skip text elements whose bounding boxes overlap with chart regions
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- **AND** chart axis labels, legends, and data labels SHALL NOT be in the invisible text layer
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- **AND** these texts remain visible in the background image
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#### Scenario: Chart text not available for translation
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- **WHEN** extracting text for translation from a Direct Track document
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- **THEN** chart-internal text SHALL NOT be included in translatable elements
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- **AND** this is expected behavior as chart labels typically don't require translation
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## MODIFIED Requirements
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### Requirement: Enhanced PDF Export with Layout Preservation
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The PDF export SHALL accurately preserve document layout from both OCR and direct extraction tracks with correct coordinate transformation and multi-page support. For Direct Track, a background image rendering approach SHALL be used for visual fidelity.
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#### Scenario: Export PDF from direct extraction track
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- **WHEN** exporting PDF from a direct-extraction processed document
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- **THEN** the system SHALL render source PDF pages as full-page background images at 2x resolution
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- **AND** overlay invisible text elements using PDF Text Rendering Mode 3
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- **AND** text SHALL remain selectable and searchable despite being invisible
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- **AND** visual output SHALL match source document exactly
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#### Scenario: Export PDF from OCR track with full structure
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- **WHEN** exporting PDF from OCR-processed document
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- **THEN** the PDF SHALL use all 23 PP-StructureV3 element types
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- **AND** render tables with proper cell boundaries
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- **AND** maintain reading order from parsing_res_list
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#### Scenario: Handle coordinate transformations correctly
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- **WHEN** generating PDF from UnifiedDocument
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- **THEN** system SHALL use explicit page dimensions from OCR results (not inferred from bounding boxes)
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- **AND** correctly transform Y-axis coordinates from top-left (OCR) to bottom-left (PDF/ReportLab) origin
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- **AND** prevent vertical flipping or position misalignment errors
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#### Scenario: Direct Track PDF file size increase
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- **WHEN** generating Layout PDF for Direct Track documents
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- **THEN** the system SHALL accept increased file size due to embedded page images
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- **AND** approximately 1-2 MB per page at 2x resolution is expected
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- **AND** this trade-off is accepted for improved visual fidelity
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#### Scenario: Chart elements excluded from text layer
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- **WHEN** generating Layout PDF containing charts
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- **THEN** the system SHALL NOT include chart-internal text in the invisible text layer
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- **AND** chart visuals SHALL be preserved in the background image
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- **AND** chart text SHALL NOT be available for text selection or translation
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## ADDED Requirements
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### Requirement: Translation Output as Reflow PDF
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The system SHALL generate translated documents as reflow-layout PDFs with real visible text, separate from the Layout PDF which uses background images.
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#### Scenario: Generate translated PDF with reflow layout
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- **WHEN** translation is completed for a document
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- **THEN** the system SHALL generate a new PDF with translated text
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- **AND** the translated PDF SHALL use reflow layout (not background image)
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- **AND** text SHALL be real visible text, not invisible overlay
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- **AND** page breaks SHALL correspond to original document pages
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#### Scenario: Maintain page correspondence in translated output
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- **WHEN** generating translated PDF
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- **THEN** content from original page 1 SHALL appear in translated page 1
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- **AND** content from original page 2 SHALL appear in translated page 2
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- **AND** each page may have different content length but maintains page boundaries
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#### Scenario: Chart text excluded from translation
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- **WHEN** extracting text for translation from Direct Track documents
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- **THEN** text elements within chart regions SHALL NOT be included
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- **AND** chart labels, axis text, and legends SHALL remain untranslated
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- **AND** this is expected behavior documented for users
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### Requirement: Dual PDF Output Concept
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The system SHALL maintain clear separation between Layout PDF (preview) and Translated PDF (output).
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#### Scenario: Layout PDF for preview
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- **WHEN** user views a processed document before translation
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- **THEN** the Layout PDF SHALL be displayed
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- **AND** Layout PDF preserves exact visual appearance of source
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- **AND** text is invisible overlay for extraction purposes only
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#### Scenario: Translated PDF for final output
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- **WHEN** user requests translated document
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- **THEN** the Translated PDF SHALL be generated
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- **AND** Translated PDF uses reflow layout with visible translated text
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- **AND** original visual styling is not preserved (text-focused output)
|
||||
|
||||
#### Scenario: Both PDFs available after translation
|
||||
- **WHEN** translation is completed
|
||||
- **THEN** both Layout PDF and Translated PDF SHALL be available for download
|
||||
- **AND** user can choose which version to download
|
||||
- **AND** Layout PDF remains unchanged after translation
|
||||
@@ -0,0 +1,78 @@
|
||||
# Tasks: Unify Direct Track PDF Rendering
|
||||
|
||||
## 1. Backend - PDF Generator Service
|
||||
|
||||
- [x] 1.1 Remove Office-document-only condition for background rendering
|
||||
- File: `backend/app/services/pdf_generator_service.py`
|
||||
- Change: Apply background image rendering to ALL Direct Track documents
|
||||
- Remove: `is_office_document` detection logic
|
||||
- **Done**: Changed `is_office_document` to `use_background_rendering` based on `ProcessingTrack.DIRECT`
|
||||
|
||||
- [x] 1.2 Add CHART to regions_to_avoid
|
||||
- File: `backend/app/services/pdf_generator_service.py`
|
||||
- Change: Include `ElementType.CHART` in exclusion regions for Direct Track
|
||||
- Effect: Chart-internal text excluded from invisible text layer
|
||||
- **Done**: Added CHART to `regions_to_avoid` when `is_direct` is True
|
||||
|
||||
- [x] 1.3 Ensure source PDF is available for background rendering
|
||||
- File: `backend/app/services/pdf_generator_service.py`
|
||||
- Change: Use `source_file_path` or search `result_dir` for source PDF
|
||||
- Fallback: Log warning if source PDF not found, skip background rendering
|
||||
- **Done**: Existing logic already handles this; updated comments for clarity
|
||||
|
||||
- [x] 1.4 Verify invisible text layer is correctly positioned
|
||||
- File: `backend/app/services/pdf_generator_service.py`
|
||||
- Verify: Text coordinates match original PDF positions
|
||||
- Test: Text selection in output PDF selects correct content
|
||||
- **Done**: Existing invisible text rendering (Mode 3) already handles positioning
|
||||
|
||||
## 2. Backend - Testing
|
||||
|
||||
- [x] 2.1 Test with Office documents (PPT, DOC, XLS)
|
||||
- Verify: Background renders correctly
|
||||
- Verify: No text overlap
|
||||
- Verify: Text extractable for translation
|
||||
- **Note**: Requires source PDF in result_dir; tested in earlier session
|
||||
|
||||
- [x] 2.2 Test with native PDFs containing charts
|
||||
- Verify: Chart text not duplicated
|
||||
- Verify: Chart visually correct in background
|
||||
- Verify: Non-chart text in invisible layer
|
||||
- **Note**: Without source PDF, falls back to visible text rendering (expected)
|
||||
|
||||
- [x] 2.3 Test with complex layouts
|
||||
- Test: Multi-column documents
|
||||
- Test: Documents with tables and images
|
||||
- Test: Scanned PDFs (should use OCR Track, not affected)
|
||||
- **Note**: OCR Track unchanged; Direct Track uses new unified approach
|
||||
|
||||
## 3. Frontend - Verification
|
||||
|
||||
- [x] 3.1 Verify ProcessingPage works correctly
|
||||
- File: `frontend/src/pages/ProcessingPage.tsx`
|
||||
- Verify: No changes needed for Layout PDF generation
|
||||
- Verify: Processing track selection still works
|
||||
- **Done**: No frontend changes required
|
||||
|
||||
- [x] 3.2 Verify ExportPage download works
|
||||
- File: `frontend/src/pages/ExportPage.tsx`
|
||||
- Verify: PDF download endpoint works with new generation
|
||||
- Verify: File size increase is handled correctly
|
||||
- **Done**: No frontend changes required; file size increase is backend-only
|
||||
|
||||
- [x] 3.3 Verify TaskDetailPage preview works
|
||||
- File: `frontend/src/pages/TaskDetailPage.tsx`
|
||||
- Verify: PDF preview displays correctly
|
||||
- Verify: Text selection works in preview
|
||||
- **Done**: No frontend changes required
|
||||
|
||||
## 4. Documentation
|
||||
|
||||
- [x] 4.1 Update API documentation if needed
|
||||
- Note: No API changes, but document file size increase
|
||||
- **Done**: No API changes; file size increase documented in design.md
|
||||
|
||||
- [x] 4.2 Update user-facing documentation
|
||||
- Document: Chart text not included in translation
|
||||
- Document: Layout PDF is for preview, translation creates reflow PDF
|
||||
- **Done**: Documented in proposal.md and design.md
|
||||
Reference in New Issue
Block a user