apng

Fast APNG encoding with concurrent frame encoding.

Installation

go get github.com/setanarut/apng

20 frames animation encoding benchmark

Image Size	kettek	setanarut
125x125	173 ms	43 ms
250x250	655 ms	153 ms
500x500	2542 ms	565 ms
1000x1000	10174 ms	2213 ms
2000x2000	40745 ms	8831 ms

Example

package main

import (
	"image"
	"image/color"
	"math/rand/v2"

	"github.com/setanarut/apng"
)

func main() {
	frames := make([]image.Image, 8)
	for i := range 8 {
		frames[i] = generateNoiseImage(600, 200)
	}
	apng.Save("out.png", frames, 7)
}

func generateNoiseImage(width, height int) *image.RGBA {
	img := image.NewRGBA(image.Rect(0, 0, width, height))
	for y := range height {
		for x := range width {
			col := noisePalette[rand.IntN(4)]
			img.SetRGBA(x, y, col)
		}
	}
	return img
}

var noisePalette = []color.RGBA{
	{R: 0, G: 0, B: 0, A: 255},   // Black
	{R: 255, G: 0, B: 0, A: 255}, // Red
	{R: 0, G: 255, B: 0, A: 255}, // Green
	{R: 0, G: 0, B: 255, A: 255}, // Blue
}