This is a tiny cgo wrapper around the MozJPEG API. It only supports the quality and the progressive parameters, as it is still a work in progress.

Requirements

mozjpego assumes that MozJPEG C header files as well as the shared librairies, resulting from running make && make install in the official MozJPEG project, are already present in the host system. mozjpego makes the assumption that the host system is Linux, so it expects that:

• The header files are present under /opt/mozjpeg/include/
• The shared libraries files are present under /opt/mozjpeg/lib64/

If you are using a different operation system or your MozJPEG installation happens to be in a different location, you can use the CGO_CFLAGS and CGO_LDFLAGS environment variables to override the #cgo directives here, for example:

export CGO_CFLAGS="-I/your/custom/headers/location"
export CGO_LDFLAGS="-L/your/custom/location -lturbojpeg -ljpeg -Wl,-rpath=/your/custom/location "

This is the solution that I found to avoid bloating the repo with the many .h and .so files required. If you have a better suggestion, please let me know.

Usage Example:

package main

import (
	"log"
	"os"

	"github.com/imager200/mozjpego"
)

func main() {
	p := mozjpego.Parameters{Quality: 85, Progressive: false}

	b, err := os.ReadFile("jpeg_image.jpeg")
	if err != nil {
		log.Fatal(err.Error())
	}

	res, err := mozjpego.Compress(b, p)
	if err != nil {
		log.Fatal(err.Error())
	}

	if err := os.WriteFile("result.jpeg", res, 0644); err != nil {
		log.Fatal(err.Error())
	}
}

Similar projects:

• https://github.com/pixiv/go-libjpeg