Manray

Streaming image renderer for fabric.js canvas JSON data

Takes your canvas JSON from fabric and returns a stream of image data from phantomjs

Why?

Capturing screenshots from canvas can be tricky, especially if you're using SVGs. SVGs when drawn on canvas using drawImage(), even from same-origin or using base64 data will taint your canvas and prevent you from calling getImageData() on your canvas.

This is a simple way to sidestep that restriction by having Manray do the rendering for you from JSON.

How?

var Manray = require('manray');

var canvasData = {canvases:[{...}]}; // canvas data from fabric.Canvas.prototype.toDatalessJSON()

var pool = new Manray.pool(5);       // Pool with 5 workers

var stream = pool.render(canvasData, 
    {  
        output: 'base64'             // one of 'base64' (string) or 'binary' (buffer)
    }
);

stream.pipe(toWherever);

Don't want a stream? Use a callback instead.

var Manray = require('manray');

var canvasData = {canvases:[{...}]}; // canvas data from fabric.Canvas.prototype.toDatalessJSON()

var pool = new Manray.pool(5);       // Pool with 5 workers

pool.render(canvasData, 
    {  
        output: 'base64'
    },
    function (buff) {
    
    }
);