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Pixer

Pixer is a cross-platform library for image manipulation: resize, crop, rotate, create thumbnails, combine images, and more. It uses Rust's image crate via FFI to provide high-performance image processing.

Project Structure

  • /native - Rust crate (pixer) with image processing logic
  • /packages/pixer - Main Dart package with FFI bindings
  • /packages/benchmarks - Performance benchmarks
  • /packages/upscale_flutter - Flutter demo app

Useful Commands

# Build native library locally
# Examples: -omacos -aarm64, -olinux -ax64, -oandroid -aarm64
dart tool/build.dart -o<os> -a<arch>
# Generate FFI bindings (after changing native/src/ffi.rs)
dart run ffigen --config ffigen.yaml

Release

  1. Push changes via PR to main
  2. Tag and push: git tag pixer-assets-v1.0.0 && git push origin pixer-assets-v1.0.0
  3. CI builds all platforms and creates GitHub Release

Architecture

  • Rust code in native/src/: lib.rs (entry), api.rs (image ops), ffi.rs (C-compatible API)
  • Dart bindings generated via ffigen into lib/src/bindings/
  • Native assets delivered via Dart build hooks (see hook/ directory)