AGG.rs — Anti-Grain Geometry for Rust

A pure Rust port of Anti-Grain Geometry (AGG) 2.6 — the legendary high-quality 2D software rendering library originally written in C++ by Maxim Shemanarev. Zero external dependencies. Pixel-perfect anti-aliased output. No GPU required.

Try the Interactive Demo — 64 demos running entirely in your browser via WebAssembly.

Crate listing: agg-rust on crates.io.

Features

AGG is a software rendering engine that produces pixel images in memory from vectorial data. It is platform-independent and achieves exceptional rendering quality through:

• Anti-Aliasing — subpixel-accurate scanline rasterization
• Affine & Perspective Transforms — rotation, scaling, skewing, and full perspective warps
• Gradient Fills — linear, radial, focal-point, and custom gradient functions with multi-stop color interpolation
• Gouraud Shading — smooth per-vertex color interpolation across triangles and meshes
• Image Filtering — 17 interpolation filters including bilinear, bicubic, sinc, Blackman, and more
• 30+ Compositing Modes — full SVG 1.2 compatible Porter-Duff and blend operations
• Stroke & Dash Generation — configurable line joins, caps, dashes, and markers
• Alpha Masking — arbitrary clip regions through grayscale alpha masks
• Stack Blur — fast approximate Gaussian blur with adjustable radius
• Pattern Fills — tiled and resampled pattern rendering with perspective support
• Built-in Fonts — 34 embedded bitmap fonts plus vector text via GSV text engine
• Boolean Operations — scanline-level union, intersection, difference, and XOR

Architecture

AGG uses a five-stage rendering pipeline with interchangeable components:

Vertex Source → Coordinate Conversion → Scanline Rasterizer → Scanline Container → Renderer

Each stage is a trait in the Rust port, allowing components to be freely mixed and matched:

Stage	Purpose	Examples
Vertex Source	Generates path vertices	PathStorage, Ellipse, RoundedRect, GsvText
Coordinate Conversion	Transforms and processes paths	ConvCurve, ConvStroke, ConvDash, ConvTransform
Scanline Rasterizer	Converts paths to scanlines	RasterizerScanlineAa, RasterizerCompoundAa
Scanline Container	Stores scanline coverage data	ScanlineU8, ScanlineP8, ScanlineBin
Renderer	Writes pixels to the buffer	RendererScanlineAaSolid, RendererBase, pixel formats

Interactive Demos

All 64 demos run in-browser via WebAssembly with no server-side processing. Categories include:

Category	Demos	Highlights
Anti-Aliasing	AA Demo, Rasterizers, Gamma, AA Test	Subpixel rendering quality visualization
Rendering	Lion, Perspective, Circles, Alpha Masks, Blur	Complex vector scenes with transforms
Gradients	Linear/Radial, Gouraud, Focal Point, Mesh	Multi-stop color interpolation
Paths & Strokes	Stroke, Contour, Dash, Line Patterns	Join/cap styles, dash patterns
Curves	Bezier, B-Spline, Text on Curve	Interactive control point editing
Images & Filters	17 Filter Types, Perspective, Resample	Image transform and filter quality
Compositing	SVG Blend Modes, Flash Rasterizer	Porter-Duff and blend operations
Patterns	Pattern Fill, Perspective, Resample	Tiled pattern rendering
Text	GSV Vector Text, 34 Raster Fonts	Built-in font rendering

Browse all demos →

Quick Start

[dependencies]
agg-rust = "1.0"

use agg_rust::*;

// Create a rendering buffer
let mut buf = vec![0u8; width * height * 4];
let mut rbuf = RenderingBuffer::new(&mut buf, width, height, width * 4);

// Set up the pixel format and renderer
let mut pixfmt = PixfmtRgba32::new(&mut rbuf);
let mut ren_base = RendererBase::new(&mut pixfmt);
ren_base.clear(&Rgba8::new(255, 255, 255, 255));

// Create a path and rasterize it
let mut path = PathStorage::new();
path.move_to(10.0, 10.0);
path.line_to(100.0, 50.0);
path.line_to(50.0, 100.0);
path.close_polygon();

let mut ras = RasterizerScanlineAa::new();
let mut sl = ScanlineU8::new();
ras.add_path(&mut path);
render_scanlines_aa_solid(&mut ras, &mut sl, &mut ren_base, &Rgba8::new(200, 80, 80, 255));

Development

Prerequisites

• Rust 1.70+ (rustup install stable)
• wasm-pack (for WASM demos)
• Bun (for demo dev server)

Building & Testing

cargo build
cargo test                    # 903 tests
cargo clippy -- -D warnings

Running the Demo Locally

cd demo
bun install
bun run build:wasm
bun run dev

Then open http://localhost:3000 in your browser.

Project Status

All 88 core library modules have been ported from the C++ original with 903 tests passing. All 64 applicable demos are fully implemented and running via WebAssembly.

Metric	Value
Core modules ported	88
Tests passing	903
Interactive demos	64
External dependencies	0
GPU dependencies	0

License

BSD-3-Clause — see LICENSE.

Based on the original Anti-Grain Geometry library by Maxim Shemanarev, dual-licensed under the Modified BSD License and the Anti-Grain Geometry Public License.

Note: The GPC (General Polygon Clipper) component from the original library is excluded from this port due to its non-commercial license restriction.

Acknowledgments

• Maxim Shemanarev (1966–2013) — creator of Anti-Grain Geometry, a masterwork of C++ library design
• ghaerr/agg-2.6 — the GitHub mirror of AGG 2.6 used as reference
• Ported by Lars Brubaker, sponsored by MatterHackers