This project is a minimal, cross-platform demonstration of how to use Dart‘s build hooks, with code assets and dart:ffi to call a simple function from a popular C library. This project uses stbi_info from the stb_image.h library to read an image’s dimensions and color channels without loading the entire file into memory.
The native code is built by the hook/build.dart, which is run by the Dart SDK CLI tools. This build hook compiles the C code from third_party/stb_image.c into a dynamic library.
The Dart FFI bindings to the C code are generated by tool/ffigen.dart. FFIgen generates Dart FFI bindings from third_party/stb_image.h into lib/src/third_party/stb_image.g.dart.
The Dart code in lib/stb_image.dart uses the generated FFI bindings to provide a Dart API (not exposing any C types).