Alibaba Terminal Technology

Apr 12, 2022 · Frontend Development

Accurate Text Measurement and Rendering in Canvas with Font Shaping and HarfBuzz

This article explains how to load custom fonts, handle text shaping, measure and wrap text accurately in HTML5 canvas, and overcome issues like Arabic glyph variations and letter‑spacing by using ctx.measureText, whole‑string measurement, performance‑aware algorithms, and the HarfBuzz shaping engine.