gifencoder
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:
Installation
This module is installed via npm:
$ npm install gifencoder
Streaming API - Duplex Piping with Writes
You 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
.
Example: Streaming API - Reads
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);
encoder.createReadStream().pipe(fs.createWriteStream('myanimated.gif'));
encoder.start();
encoder.setRepeat(0);
encoder.setDelay(500);
encoder.setQuality(10);
var canvas = new Canvas(320, 240);
var ctx = canvas.getContext('2d');
ctx.fillStyle = '#ff0000';
ctx.fillRect(0, 0, 320, 240);
encoder.addFrame(ctx);
ctx.fillStyle = '#00ff00';
ctx.fillRect(0, 0, 320, 240);
encoder.addFrame(ctx);
ctx.fillStyle = '#0000ff';
ctx.fillRect(0, 0, 320, 240);
encoder.addFrame(ctx);
encoder.finish();
The above code will generate the following animated GIF: