Mirrors/Stirling-PDF
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d4c702f96c
Stirling-PDF/docs/pdf-json-editor-backlog.md
Anthony Stirling d4c702f96c json size clenaup 450 to 35mb
2025-11-05 23:35:08 +00:00

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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.