pngjs/lib/filter-parse-async.js

'use strict';

var util = require('util');
var ChunkStream = require('./chunkstream');
var Filter = require('./filter-parse');


var FilterAsync = module.exports = function(bitmapInfo) {
  ChunkStream.call(this);

  var buffers = [];
  var that = this;
  this._filter = new Filter(bitmapInfo, {
    read: this.read.bind(this),
    write: function(buffer) {
      buffers.push(buffer);
    },
    complete: function() {
      that.emit('complete', Buffer.concat(buffers));
    }
  });

  this._filter.start();
};
util.inherits(FilterAsync, ChunkStream);