27ae47117e
We've been running each Make command in a single thread, resulting in fairly slow builds for C++ codecs. This change instead runs all `make` invocations with `-j` defaulting to number of cores (retrieved via `nproc`). On my machine Docker uses a VM configured to 4 cores out of 8 available. This change brings total build time for C++ codecs down from 10m28s to 7m5s (~3.5 minutes difference). Note (1): I've converted imagequant builds to use built-in `make` as well to leverage this parallelisation and future-proof build script. Note (2): we don't need to do the same for Rust, since Cargo parallelises builds by default.
Codecs
This folder contains a self-contained sub-project for each encoder and decoder that squoosh supplies.
Build
Each subproject can be built using Docker the following commands:
$ npm install
$ npm run build
This will build two files: <codec name>_<enc or dec>.js and <codec name>_<enc or dec>.wasm. It will most likely be necessary to set Module["locateFile"] to successfully load the .wasm file. When the .js file is loaded, a global <codec name>_<enc or dec> is created with the same API as an Emscripten Module.
Each codec will document its API in its README.