penpot/render-wasm
Alonso Torres b609a964be
🐛 Fix boolean issues on the wasm render
* 🐛 Fix sharp angles in text-to-path due to wrong quad/conic degree elevation

* 🐛 Preserve even-odd fill type through Skia path conversions

* 🐛 Fix wrong quadratic-to-cubic degree elevation in push_bezier

* 🐛 Skip zero-length degenerate close segments in path_to_beziers

* 🐛 Replace BTreeMap for Vec for bool calculation

* 🐛 Fix even_odd missing when creating Path
2026-05-26 15:11:52 +02:00
..
2026-03-18 18:05:30 +01:00
2026-05-26 15:11:52 +02:00
2026-05-08 11:10:14 +02:00
2026-02-25 10:30:29 +01:00
2026-02-25 10:30:29 +01:00
2026-02-18 09:57:25 +01:00
2026-02-25 10:30:29 +01:00

Penpot WASM render

This is the canvas-based WebAssembly render engine for Penpot.

Rust & Emscripten

This project is a Rust crate that targets Emscripten (wasm32-unknown-emscripten).

We use wasm32-unknown-emscripten compilation target:

  • It compiles Rust code into WASM
  • It generates the JavaScript code (“glue”) to load and run the WASM code

How Rust, Emscripten, and WASM are connected

Skia

We use Skia, an Open Source 2D graphics library. In particular, the render engine uses Skia via custom binaries of the rust-skia crate.

How to build

With the Penpot Development Environment running, create a new tab in the tmux.

cd penpot/render-wasm
./build

You can also use ./watch to run the build on every change.

The build script will compile the project and copy the .js and .wasm files to their correct location within the frontend app.

Architecture overview

Edit your local frontend/resources/public/js/config.js to add the following flags:

  • enable-feature-render-wasm to enable this render engine.
  • enable-render-wasm-dpr (optional), to enable using the device pixel ratio.

How to test

We currently have two types of tests:

  • Unit tests
cd penpot/render-wasm
./test

Technical documentation