WebP Encoder/Decoder for Golang

WebP Encoder/Decoder for Golang based on official libwebp distribution

Install

go get -u github.com/nickalie/go-webpbin

Available env

All env can be override with option functions.

Name	Default	Desscription
SKIP_DOWNLOAD	false	Download webp bin automatically. Since there is no precompiled file for alpine, THE SKIP_DOWNLOAD MUST BE true AND ASSIGN A SOURCE FOR RUN.
VENDOR_PATH	.bin/webp	When there is no lib within and SKIP_DOWNLAOD is not true, it'll be downloaded.
LIBWEBP_VERSION	1.2.0	The latest version for now. (2021/07/16)

Example of usage

package main

import (
	"image"
	"image/color"
	"log"
	"os"
	"github.com/nickalie/go-webpbin"
)

func main() {
	const width, height = 256, 256

	// Create a colored image of the given width and height.
	img := image.NewNRGBA(image.Rect(0, 0, width, height))

	for y := 0; y < height; y++ {
		for x := 0; x < width; x++ {
			img.Set(x, y, color.NRGBA{
				R: uint8((x + y) & 255),
				G: uint8((x + y) << 1 & 255),
				B: uint8((x + y) << 2 & 255),
				A: 255,
			})
		}
	}

	f, err := os.Create("image.webp")
	if err != nil {
		log.Fatal(err)
	}

	if err := webpbin.Encode(f, img); err != nil {
		f.Close()
		log.Fatal(err)
	}

	if err := f.Close(); err != nil {
		log.Fatal(err)
	}
}

CWebP

CWebP is a wrapper for cwebp command line tool.

Example to convert image.png to image.webp:

err := webpbin.NewCWebP().
		Quality(80).
		InputFile("image.png").
		OutputFile("image.webp").
		Run()

DWebP

DWebP is a wrapper for dwebp command line tool.

Example to convert image.webp to image.png:

err := webpbin.NewDWebP().
		InputFile("image.webp").
		OutputFile("image.png").
		Run()

libwebp distribution

Under the hood library uses official libwebp distribution, so if you're going to use it on not supported platform (arm or alpine), you need to build libwebp from sources and set SKIP_DOWNLOAD=true.

Snippet to build libweb on alpine:

apk add --no-cache --update libpng-dev libjpeg-turbo-dev giflib-dev tiff-dev autoconf automake make gcc g++ wget

wget https://storage.googleapis.com/downloads.webmproject.org/releases/webp/libwebp-0.6.0.tar.gz && \
tar -xvzf libwebp-0.6.0.tar.gz && \
mv libwebp-0.6.0 libwebp && \
rm libwebp-0.6.0.tar.gz && \
cd /libwebp && \
./configure && \
make && \
make install && \
rm -rf libwebp