femtovg

GPU Antialiased 2D vector drawing library written in Rust.

• Cargo crate
• Book
• Join the femtovg Discord channel

---

Ported from https://github.com/memononen/nanovg

Most of the implementation is the same as the original C code with some bug fixes, some features added and several parts have been made more Rust-y. Rendering is done via one OpenGl (ES) 3.0+ backend.

Screenshots

Demo

Run with cargo run --example demo

Breakout

Run with cargo run --example breakout

SVG

Run with cargo run --example svg

Text

Run with cargo run --example text

Features

• Anti-aliasing
• Bézier paths filling and stroking
• Solid color and image pattern fills and strokes
• Gradients - box, linear, radial (including two-point / focal), and conic, with multi-stop colors and gradient transforms
• Stroke width and miterlimit
• Stroke caps: butt, round and square
• Stroke joins: miter, round and bevel
• Stroke dashing with dash offset
• Fill rules - EvenOdd/NonZero
• Rectangle scissoring (with rounded corners) and arbitrary-path clipping (Canvas 2D clip / SVG clip-path, nonzero and evenodd)
• Composition modes (SourceOver, SourceIn, SourceOut, Atop, etc..)
• Image filters - gaussian blur, color matrices (the CSS filter functions), Perlin turbulence (SVG feTurbulence) and the sRGB transfer curve, chained in a single call
• Layers - group capture with declared opacity and layer filters (Canvas 2D beginLayer/endLayer, SVG group effects)
• Layer masks - luminance and alpha (SVG mask / mask-type)
• Global alpha
• Text filling and stroking
• Text shaping
• Text alignment: (left center right), (top, middle, alphabetic, bottom)
• Nearest font matching
• Path hit testing
• OpenGl ES2 backend
• WGPU backend
• Color fonts

Not supported

• Custom shaders
• 3D transforms

Ecosystem

FemtoVG is used by these projects:

• pn-editor https://gitlab.com/porky11/pn-editor: view, edit, and simulate petri nets
• Slint https://slint.dev: A declarative GUI toolkit to build native user interfaces for embedded, desktop, and mobile application
• inlottie https://github.com/mhfan/inlottie: lib/tool in Rust for Lottie (Bodymovin) Animation
• Mapvas https://github.com/UdHo/mapvas: A map canvas showing OSM tiles with drawing functionality

License

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT) at your option.

Fonts used in examples:

• Roboto licensed under Apache license
• Entypo licensed under CC BY-SA 4.0.
• Amiri licensed under SIL Open Font License, Version 1.1