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Rust JVM bindings to zune-image

This contains the rust bindings to zune-image used by Pixly as the native backend for image processing (loading, saving, processing)

They are needed by the Jvm endpoints which include Desktop and Android.

So here is how to build for those endpoints

Building

Prerequisites

  • We assume you have installed rust and cargo, if not please see how to do that here
  • We assume you have installed Android NDK tools, if not see here on how to do that.

Steps to compile

I'm on Linux, so I'll be explaining how to build Android and Linux from there, there is a guide explaining how to build Windows dlls later on

Building Android

  1. Get rust endpoints by running the following

     rustup target add aarch64-linux-android armv7-linux-androideabi i686-linux-android

  2. Depending on where your ndk files are stored, modify ./cargo/config to change the linkers, the current base linker is opt/android-sdk/ndk/26.1.10909125/ for my machine, so this is the only thing that needs to change

  3. Run the commands to build for each target

    cargo build --target aarch64-linux-android --release
cargo build --target armv7-linux-androideabi --release
cargo build --target i686-linux-android --release

    In case you get linker errors like

    error adding symbols: file in wrong format
      collect2: error: ld returned 1 exit status

    Means step 2 was done wrongly, repeat that

  4. Copy the generated files to composeApp/src/androidMain/jniLibs/{ARCH}

    We assume you are in the directory rust

    cp ./target/aarch64-linux-android/release/libzune_jni_bindings.so ../composeApp/src/androidMain/jniLibs/arm64-v8a/
cp ./target/armv7-linux-androideabi/release/libzune_jni_bindings.so ../composeApp/src/androidMain/jniLibs/armeabi-v7a/
cp ./target/i686-linux-android/release/libzune_jni_bindings.so ../composeApp/src/androidMain/jniLibs/x86/

  5. You are all done, the libraries should be picked up by Gradle and android automatically