core — the render engine

In short core is the heart of paged — a Rust workspace that reads an IDML package and renders it pixel-faithfully. It's public (dual-licensed) and is the only repo every other consumer depends on, across a wasm/package boundary.

What it does

• Parses full Adobe IDML — the design map, spreads, frames, stories with threading, cascade-resolved styles, gradients, and placed images.
• Lays out text with an InDesign-calibrated Knuth–Plass composer (hyphenation, tab stops, multi-font runs).
• Renders through WebGPU (Vello) for forward output, with a tiny-skia CPU backend kept for headless fidelity testing.
• Offers a mutation layer (insert/delete/edit, all undoable), a headless ViewerSession, PDF export, and byte-faithful round-trip serialization.

How it's organized

A multi-crate workspace following the pipeline: paged-parse → paged-scene → paged-text → paged-compose → paged-gpu, with paged-renderer orchestrating and paged-fidelity running the ΔE2000/SSIM diff harness. The scripting surface lives in paged-script (Boa) + paged-run (headless CLI), and the public scripting catalog in paged-introspect.

How you consume it

Published to npm as @paged-media/canvas-wasm, introspect-wasm, and idml-viewer (versioned 0.<protocol>.<patch>). No consumer takes a source dependency. The renderer reference documents its behavior; the scripting layer documents its paged.* surface.

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