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docs/pdf-json-editor-backlog.md

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+# PDF JSON Editor Backlog
+
+- **Type3 Font Support (Text Additions)**
+  - 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.
+  - Preserve the original Type3 resources for round-trip fidelity; use the synthesized font only for edited elements while reusing the original stream elsewhere.
+  - 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`).
+  - Update the viewer/renderer to surface conversion errors and block editing when no faithful font can be produced.
+
+- **Vector Artwork Preview**
+  - Reuse `contentStreams` already emitted by the backend to render vector paths alongside text/images in the React workspace (`frontend/src/proprietary/components/tools/pdfJsonEditor/PdfJsonEditorView.tsx:1048-1285`).
+  - Either render via Canvas/SVG on the client or call back to a server-rendered bitmap for the background. Keep edited text/images layered on top.
+  - Maintain export fidelity by writing any untouched vector stream back during PDF regeneration (`PdfJsonConversionService.java:1714-1799`, `520-612`).
+
+- **Lazy Fetch Endpoints**
+  - Provide separate endpoints to fetch:
+    1. Raw COS dictionaries/font programs when the user opens advanced panels.
+    2. Page-level raster/vector previews to avoid sending large `imageData` upfront.
+  - Reuse the existing job cache (`documentCache`) to serve these on demand and clean up after timeouts (`PdfJsonConversionService.java:3608-3687`).
+
+- **Editor UX Safeguards**
+  - Respect `fallbackFontService` indicators; mark groups using fallback glyphs so the UI can warn about possible appearance shifts (`frontend/src/proprietary/components/tools/pdfJsonEditor/PdfJsonEditorView.tsx:1260-1287`).
+  - Surface when Type3 conversion was downgraded (e.g., rasterized glyphs) and limit editing to operations that keep the PDF stable.
+
+- **Canonical Font Sharing**
+  - 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.
+  - Store COS dictionaries only on canonical entries; aliases should keep light fields (e.g., size adjustments) if they differ.
+  - Update `buildFontMap` to resolve aliases when recreating PDFBox fonts, and adjust the front end to load programs via the canonical UID.
+  - Optional: expose a lazy endpoint for the original COS dictionary if the canonical record strips it, so export still reconstructs untouched fonts.