skia-rs-skottie

Lottie animation support for skia-rs, providing a Rust implementation of Skia's Skottie library.

Features

• JSON Parsing: Full Lottie JSON format support
• Animation Playback: Timeline-based animation with frame interpolation
• Shape Layers: Paths, fills, strokes, gradients
• Transform Animations: Position, scale, rotation, opacity
• Masks & Mattes: Alpha masks, track mattes
• Expressions: Subset of Lottie expressions

Usage

use skia_rs_skottie::{Animation, AnimationBuilder};

// Load from JSON string
let animation = Animation::from_json(json_string)?;

// Get animation properties
println!("Duration: {} seconds", animation.duration());
println!("Frame rate: {} fps", animation.fps());
println!("Size: {}x{}", animation.width(), animation.height());

// Render a specific frame
let canvas = /* your canvas */;
animation.render(canvas, frame_time);

// Or seek to normalized time (0.0 - 1.0)
animation.seek(0.5); // Seek to 50%
animation.render(canvas, None);

Supported Features

Layers

• Shape layers
• Solid layers
• Image layers (references)
• Precomposition layers
• Null layers

Shapes

• Rectangle
• Ellipse
• Path
• Polystar
• Fill
• Stroke
• Gradient fill/stroke
• Group
• Trim paths

Transforms

• Position
• Anchor point
• Scale
• Rotation
• Opacity
• Skew

Effects

• Masks (Add, Subtract, Intersect, Difference)
• Track mattes (Alpha, Alpha Inverted, Luma, Luma Inverted)

License

MIT OR Apache-2.0