Roadmap: The “Galley Pro” Ambitions#

Galley is currently a focused, lightweight viewer. The following features are under consideration or in early exploration.

1. Universal SyncTeX Bridge: pandoc-synctex#

A bidirectional synchronization bridge between structured text formats and Galley. By leveraging ASTs (like Pandoc’s +sourcepos) and custom Lua filters, enabling Forward / Inverse Search from Typst, SATySFi, Vivliostyle (VFM), AsciiDoc, and Re:VIEW sources.

2. Hybrid Rendering Engine & Typography Inspector#

A hybrid backend (Poppler + HarfBuzz + FreeType) to go beyond PDFKit’s screen rendering:

  • Output Preview — CMYK and Spot Color extraction in /Separation and /DeviceN modes.
  • Typography Inspector — Embedded font names, raw CIDs/GIDs, and subset statuses from the PDF stream.
  • OpenType Shaping Validation — Verify glyph positioning against kerning, ligatures, and complex text layout rules.

3. PDF/X & PDF/A Preflight and Fixup#

Native PDF/X (X-1a, X-4) and PDF/A validation and fixup, including transparency flattening, bleed box generation, color conversions via macOS ColorSync, and ICC profile tagging.

4. Extended URL Scheme API#

Expanding the galleypdf:// scheme for advanced navigation, build integration, dynamic configuration, preflight visualization, document diff, and export / conversion.

5. Command Line Interface (CLI)#

Providing CLI access to preflight, export, imposition, and viewer control so that any GUI operation can also be scripted from the terminal.

Backward UserDefaults Keys