Streaming server-side animated (and non-animated) gif generation for node.js
This code is based on the fine work of the following developers, but adds server-side generation with node-canvas and support for node.js Buffers:
- Kevin Weiner (original Java version - [email protected])
- Thibault Imbert (AS3 version - bytearray.org)
- Johan Nordberg (gif.js - [email protected])
This module is installed via npm:
$ npm install gifencoderYou can also stream writes of pixel data (or canvas contexts) to the encoder:
var GIFEncoder = require('gifencoder');
var encoder = new GIFEncoder(854, 480);
var pngFileStream = require('png-file-stream');
pngFileStream('test/**/frame?.png')
.pipe(encoder.createWriteStream({ repeat: -1, delay: 500, quality: 10 }))
.pipe(fs.createWriteStream('myanimated.gif')));NB: The chunks that get emitted by your read stream must either by a 1-dimensional bitmap of RGBA
data (either an array or Buffer), or a canvas 2D context.
You can also use a streaming API to receive data:
var GIFEncoder = require('gifencoder');
var Canvas = require('canvas');
var fs = require('fs');
var encoder = new GIFEncoder(320, 240);
// stream the results as they are available into myanimated.gif
encoder.createReadStream().pipe(fs.createWriteStream('myanimated.gif'));
encoder.start();
encoder.setRepeat(0); // 0 for repeat, -1 for no-repeat
encoder.setDelay(500); // frame delay in ms
encoder.setQuality(10); // image quality. 10 is default.
// use node-canvas
var canvas = new Canvas(320, 240);
var ctx = canvas.getContext('2d');
// red rectangle
ctx.fillStyle = '#ff0000';
ctx.fillRect(0, 0, 320, 240);
encoder.addFrame(ctx);
// green rectangle
ctx.fillStyle = '#00ff00';
ctx.fillRect(0, 0, 320, 240);
encoder.addFrame(ctx);
// blue rectangle
ctx.fillStyle = '#0000ff';
ctx.fillRect(0, 0, 320, 240);
encoder.addFrame(ctx);
encoder.finish();The above code will generate the following animated GIF:
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent