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photocraft/examples/plugins/invert-rs/README.md

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Invert: an example PhotoCraft plug-in

A complete WebAssembly filter plug-in in about 70 lines of no_std Rust: no allocator, no imports, under 1 KiB built. It inverts the colour channels and leaves alpha alone, matching Image › Adjustments › Invert. The ABI is documented in docs/plugins.md.

Build

rustup target add wasm32-unknown-unknown
./build.sh

build.sh runs cargo build --release --target wasm32-unknown-unknown and copies the module to crates/plugins/tests/fixtures/invert.wasm, the test fixture the host's tests use. This crate is not a member of the PhotoCraft workspace.

Install

# Into a running app (control channel) or the CLI, as a command:
plugin.install {"path": "examples/plugins/invert-rs/target/wasm32-unknown-unknown/release/photocraft_plugin_invert.wasm"}
plugin.run {"id": "org.photocraft.example.invert"}

Or copy the .wasm into the folder set in Edit › Preferences › Plug-ins (with Use Additional Plug-ins Folder on); it then appears under Filter › Plug-ins.