New :

 - *libwebp update to  1.4.0
 - *go  1.21.1
 - *giflib 5.2.2
 - *Add method for converting GIF to WebP. See example in the file hello_animate.go.

I referred to the sizeofint/animatewebp（https://github.com/sizeofint/webpanimation） project, but due to the limited support of Go for GIF handling, the conversion results were less than ideal. Consequently, I opted to use C methods for decoding GIFs instead. Drawing inspiration from the gif2webp example within the libwebp library, I facilitated its invocation from Go. So far, this approach has proven to be effective, yielding satisfactory results.

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webp

██╗    ██╗███████╗██████╗ ██████╗
██║    ██║██╔════╝██╔══██╗██╔══██╗
██║ █╗ ██║█████╗  ██████╔╝██████╔╝
██║███╗██║██╔══╝  ██╔══██╗██╔═══╝
╚███╔███╔╝███████╗██████╔╝██║
 ╚══╝╚══╝ ╚══════╝╚═════╝ ╚═╝

Benchmark

Install

Install GCC or MinGW (download here) at first, and then run these commands:

1. go get github.com/chai2010/webp
2. go run hello.go

Example

This is a simple example:

package main

import (
	"bytes"
	"fmt"
	"io/ioutil"
	"log"

	"github.com/chai2010/webp"
)

func main() {
	var buf bytes.Buffer
	var width, height int
	var data []byte
	var err error

	// Load file data
	if data, err = ioutil.ReadFile("./testdata/1_webp_ll.webp"); err != nil {
		log.Println(err)
	}

	// GetInfo
	if width, height, _, err = webp.GetInfo(data); err != nil {
		log.Println(err)
	}
	fmt.Printf("width = %d, height = %d\n", width, height)

	// GetMetadata
	if metadata, err := webp.GetMetadata(data, "ICCP"); err != nil {
		fmt.Printf("Metadata: err = %v\n", err)
	} else {
		fmt.Printf("Metadata: %s\n", string(metadata))
	}

	// Decode webp
	m, err := webp.Decode(bytes.NewReader(data))
	if err != nil {
		log.Println(err)
	}

	// Encode lossless webp
	if err = webp.Encode(&buf, m, &webp.Options{Lossless: true}); err != nil {
		log.Println(err)
	}
	if err = ioutil.WriteFile("output.webp", buf.Bytes(), 0666); err != nil {
		log.Println(err)
	}
    
    fmt.Println("Save output.webp ok")
}

Decode and Encode as RGB format:

m, err := webp.DecodeRGB(data)
if err != nil {
	log.Fatal(err)
}

data, err := webp.EncodeRGB(m)
if err != nil {
	log.Fatal(err)
}

Notes

Change the libwebp to fast method:

internal/libwebp/src/enc/config.c
WebPConfigInitInternal
config->method = 0; // 4;

BUGS

Report bugs to [email protected].

Thanks!