libspiro ☆

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Description:
Library to simplify the drawing of curves

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: Developer tools

Tags: graphics font vector c-library curve

Install: brew install libspiro

About:
Libspiro is a C library that provides an interface for interpolating a set of Spiro control points into a smooth Bézier path. It simplifies the process of creating and editing smooth curves for font design and other graphics applications. The library handles the complex mathematical calculations, allowing developers to focus on the curve's shape.

Key Features:

Interpolates Spiro control points into Bézier curves
C library with a simple API for easy integration
Enables creation of smooth curves with fewer control points
Open source and cross-platform

Use Cases:

Font design and glyph drawing in applications like FontForge
Vector graphics editors requiring smooth curve generation
Computer-aided design (CAD) software

Alternatives:

OpenType.js – Higher-level library for font rendering in browsers, whereas Libspiro provides the low-level curve generation algorithm.
HarfBuzz – Focuses on text shaping and layout, not specifically on curve interpolation like Libspiro.

Version History

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