zeno

Zeno is a pure Rust crate that provides a high performance, low level 2D rasterization library with support for rendering paths of various styles into alpha or subpixel masks.

Features

• 256x anti-aliased rasterization (8-bit alpha or 32-bit RGBA subpixel alpha)
• Pixel perfect hit testing with customizable coverage threshold
• Non-zero and even-odd fills
• Stroking with the standard set of joins and caps (separate start and end caps are possible)
• Numerically stable dashing for smooth dash offset animation
• Vertex traversal for marker placement
• Stepped distance traversal for animation or text-on-path support
• Abstract representation of path data that imposes no policy on storage

Usage

Add this to your Cargo.toml:

[dependencies]
zeno = "0.2.0"

Rendering a dashed stroke of a triangle:

use zeno::{Cap, Join, Mask, PathData, Stroke};

// Buffer to store the mask
let mut mask = [0u8; 64 * 64];

/// Create a mask builder with some path data
Mask::new("M 8,56 32,8 56,56 Z")
    .style(
        // Stroke style with a width of 4
        Stroke::new(4.0)
            // Round line joins
            .join(Join::Round)
            // And round line caps
            .cap(Cap::Round)
            // Dash pattern followed by a dash offset
            .dash(&[10.0, 12.0, 0.0], 0.0),
    )
    // Set the target dimensions
    .size(64, 64)
    // Render into the target buffer
    .render_into(&mut mask, None);

Resulting in the following mask:

For detail on additional features and more advanced usage, see the full API documentation.