@skyra/gifenc

A very fast server-side animated GIF generation for Node.js

Features

@skyra/gifenc is a GIF encoding utility library to build your next GIFs.
Supports CommonJS and ES Module.
Heavily based on gifencoder, this module wouldn't have existed without its author.

Installation

You can use the following command to install this package, or replace npm install with your package manager of choice.

npm install @skyra/gifenc

Usage

@skyra/gifenc is very close to a drop-in replacement for gifencoder. There are only 2 differences to account for. First of all, the encoder class is named GifEncoder and not GIFEncoder, and secondly, the metadata methods are chainable.

Streaming API - Writing to a file

const { GifEncoder } = require('@skyra/gifenc');
const { createWriteStream } = require('node:fs');

const encoder = new GifEncoder(400, 400);
    // Set the repeat mode: 0 for repeat, -1 for no-repeat:
    .setRepeat(0)
    // Set the frame delay in milliseconds:
    .setDelay(500)
    // Set the image quality, 10 is default:
    .setQuality(10);

// Create a read stream and pipe it into a file write stream:
encoder.createReadStream()
    .pipe(createWriteStream('my-file.gif'));

encoder.start();

// `getFrames` enumerates over frames
for (const frame of getFrames()) {
    encoder.addFrame(frame);
}

encoder.finish();

Streaming API - Get resulting Buffer

We can use streamConsumers.buffer() from Node.js to convert the stream into a buffer starting with Node.js v16.7.0, if you're using an older version, consider making a function using stream's async iterator (Node.js v10+) or use a package.

const { GifEncoder } = require('@skyra/gifenc');
const { buffer } = require('node:stream/consumers');

const encoder = new GifEncoder(400, 400);

const stream = encoder.createReadStream();
encoder.setRepeat(0).setDelay(500).setQuality(10).start();

// `getFrames` enumerates over frames
for (const frame of getFrames()) {
    encoder.addFrame(frame);
}

encoder.finish();
const result = await buffer(stream);

Using with canvas-constructor

const { GifEncoder } = require('@skyra/gifenc');
const { Canvas } = require('canvas-constructor/skia');
// const { Canvas } = require('canvas-constructor/cairo');

const canvas = new Canvas(400, 400);
const encoder = new GifEncoder(400, 400);

const stream = encoder.createReadStream();
encoder.setRepeat(0).setDelay(500).setQuality(10).start();

const colors = ['#98DDCA', '#D5ECC2', '#FFD3B4', '#FFAAA7'];
for (const color of colors) {
    canvas.setColor(color).printRectangle(0, 0, 400, 400);
    encoder.addFrame(canvas);
}

// ...

Using with ECMAScript Modules

@skyra/gifenc supports ESM out of the box. To import the GifEncoder class, you use the following statement:

import { GifEncoder } from '@skyra/gifenc';

Buy us some doughnuts

Skyra Project is open source and always will be, even if we don't get donations. That said, we know there are amazing people who may still want to donate just to show their appreciation. Thanks you very much in advance!

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