@slideglance/measure

Deterministic OpenType text-width / line-metrics measurement as a WebAssembly module.

Part of the SlideGlance project — published to npm.

What it does

Exposes the text-measurement entry point of slideglance-font as a small WebAssembly bundle (~10× smaller than @slideglance/core). For consumers that only need to measure text widths — typically an upstream layout engine that wants to share metrics with the SlideGlance renderer for pixel parity.

Three target builds ship under dist/{bundler,web,node}/. Pick the exports subpath that matches your bundler.

Why a separate package from @slideglance/core

@slideglance/core ships the full PPTX → SVG / PNG pipeline (~5 MiB compressed wasm). A measurement-only consumer doesn't need any of that. The two packages release on independent cadences.

Install

pnpm add @slideglance/measure

Quick start

import { measureTextWidth } from "@slideglance/measure";

const widthPx = measureTextWidth({
  text: "Hello",
  fontFamily: "Inter",
  fontSize: 16,
  fontBytes: await fetch("/fonts/Inter-Regular.otf").then((r) => r.arrayBuffer()),
});

Measurement never reads system fonts — supply the font bytes explicitly via fontBytes. This is what makes the result deterministic across machines and environments.

Status

Pre-release — APIs may change before 1.0.

License

MIT — see LICENSE.