Openpdf-renderer: Improve PDF rendering and display

[andreasrosdal]

https://github.com/LibrePDF/OpenPDF/tree/master/openpdf-renderer

• Some ideas here: https://github.com/katjas/PDFrenderer

• In general openpdf-renderer need to be updated to support modern PDF files.

• Add support for JPEG images in a PDF which are included as reference.

💡 Ideas to Improve openpdf-renderer (PDFRenderer)

1. Improve performance for large PDF files

   • 🛠 Optimize rendering pipeline with better caching and memory usage.
   • 📈 Benefit: Faster page load and scrolling for large documents.

2. Add text selection and copy support

   • ⛔ Currently not interactive
   • 📈 Benefit: Users can copy text directly from rendered PDFs.

3. Add search and highlight feature

   • 🔍 Implement text search with page navigation and result highlighting.
   • 📈 Benefit: Improves usability for long or scanned documents.

4. Support form field rendering (AcroForm)

   • 🛠 Add visual support for PDF form elements (text fields, checkboxes).
   • 📈 Benefit: Viewers can see what kind of form they’re working with.

5. Support rendering of PDF annotations

   • 🖊 Display highlights, comments, and other markup stored in the PDF.
   • 📈 Benefit: Makes reviewing annotated PDFs possible.

6. Add zoom and fit-to-page modes

   • 🔍 Improve UX with options for fit-to-width, fit-to-height, and zoom.
   • 📈 Benefit: Gives more control over how PDFs are viewed in apps.

7. Support high-DPI (Retina) rendering

   • 🛠 Use resolution-independent rendering for crisp display on modern screens.
   • 📈 Benefit: Sharper text and images on high-resolution monitors.

8. Support progressive (lazy) rendering

   • 🧠 Render pages on-demand instead of all at once.
   • 📈 Benefit: Better performance and memory usage for multi-page documents.

9. Enable page thumbnails and navigation sidebar

   • 🖼 Display clickable thumbnails for quick navigation between pages.
   • 📈 Benefit: Better UX for navigating multi-page documents.

10. Add support for PDF layers (Optional Content Groups)

    • 📄 Allow showing/hiding layers when rendering.
    • 📈 Benefit: Supports architectural or technical drawings with toggled content.