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57 lines
4.4 KiB
Markdown
57 lines
4.4 KiB
Markdown
# PDF Text Editor Backlog
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- **Type3 Font Support (Text Additions)**
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- Parse Type3 charprocs to extract glyph outlines, build a synthetic TrueType/OpenType font (FontTools, Ghostscript `ps2ttf`, etc.), and store it in `webProgram` / `pdfProgram` for client use.
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- Preserve the original Type3 resources for round-trip fidelity; use the synthesized font only for edited elements while reusing the original stream elsewhere.
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- Extend conversion logic so fallback kicks in only when conversion fails, and track which elements rely on the synthetic font to avoid mixing source glyphs (`PdfJsonConversionService.java:998-1090`, `1840-2012`).
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- Update the viewer/renderer to surface conversion errors and block editing when no faithful font can be produced.
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- **Lazy Fetch Endpoints**
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- Provide separate endpoints to fetch:
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1. Raw COS dictionaries/font programs when the user opens advanced panels.
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2. Page-level raster/vector previews to avoid sending large `imageData` upfront.
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- Reuse the existing job cache (`documentCache`) to serve these on demand and clean up after timeouts (`PdfJsonConversionService.java:3608-3687`).
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- **Editor UX Safeguards**
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- Mark groups using fallback glyphs so the UI can warn about possible appearance shifts. Font family matching is now implemented (Liberation fonts), but weight matching is still TODO, so bold/italic text using fallbacks may appear lighter than original.
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- Surface when Type3 conversion was downgraded (e.g., rasterized glyphs) and limit editing to operations that keep the PDF stable.
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- Reference: `frontend/src/proprietary/components/tools/pdfTextEditor/PdfTextEditorView.tsx:1260-1287`
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- **Canonical Font Sharing**
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- Emit fonts once per unique embedded program. Add a `canonicalFonts` array containing the full payload (program, ToUnicode, metadata) and a compact `fontAliases` mapping `{pageNumber, fontId, canonicalUid}` so text elements can still reference per-page IDs.
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- Note: COS dictionaries are currently preserved for TrueType/Type0 fonts (needed for ToUnicode CMap). The canonical approach should maintain this preservation while deduplicating font programs.
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- Update `buildFontMap` to resolve aliases when recreating PDFBox fonts, and adjust the front end to load programs via the canonical UID.
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- Optional: expose a lazy endpoint for the original COS dictionary if the canonical record strips it, so export still reconstructs untouched fonts.
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- **Font Weight Matching for Fallback Fonts** ✓ COMPLETED (January 2025)
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- Font family matching is now implemented:
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- Liberation fonts (metric-compatible with Microsoft core): Arial/Helvetica→LiberationSans, Times→LiberationSerif, Courier→LiberationMono
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- DejaVu fonts (widely used open source): DejaVu→DejaVuSans, DejaVuSerif, DejaVuMono
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- Noto fonts (Google universal font): Noto→NotoSans
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- Font weight/style matching is now implemented for multiple font families:
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- Liberation Sans/Serif/Mono: Regular, Bold, Italic, BoldItalic (full support)
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- Noto Sans: Regular, Bold, Italic, BoldItalic (full support)
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- DejaVu Sans/Serif/Mono: Regular, Bold, Italic/Oblique, BoldItalic/BoldOblique (full support)
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- All font variants registered in `BUILT_IN_FALLBACK_FONTS` map (`PdfJsonFallbackFontService.java:63-267`)
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- Weight/style detection implemented in `resolveFallbackFontId()`:
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- `detectBold()`: Detects "bold", "heavy", "black", or numeric weights 600-900 (e.g., "700wght")
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- `detectItalic()`: Detects "italic" or "oblique"
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- `applyWeightStyle()`: Applies appropriate suffix (handles both "italic" and "oblique" naming)
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- All fonts consolidated from Type3 library into main fonts directory for unified fallback support
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- Benefits: Comprehensive visual consistency when editing text in bold/italic fonts across many font families
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- **Font Text Color Support**
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- Add support for reading and preserving text color information from PDF content streams
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- Enable color editing in the editor UI
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- Ensure proper round-trip conversion maintains color fidelity
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- **Space Character Handling**
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- Improve handling of space characters as proper text elements
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- Ensure spaces are correctly preserved during text extraction and reconstruction
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- Fix any issues with space positioning and width calculations
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- **Textbox Selection Enhancement**
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- Improve textbox selection behavior in the editor
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- Enhance user experience for selecting and manipulating text boxes
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- Address any selection precision or interaction issues
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