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        <h1><a href="index.html">All files</a> packer-async.js</h1>
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">"use strict";
&nbsp;
let util = require("util");
let Stream = require("stream");
let constants = require("./constants");
let Packer = require("./packer");
&nbsp;
let PackerAsync = (module.exports = function (opt) {
  Stream.call(this);
&nbsp;
  let options = opt || <span class="branch-1 cbranch-no" title="branch not covered" >{};</span>
&nbsp;
  this._packer = new Packer(options);
  this._deflate = this._packer.createDeflate();
&nbsp;
  this.readable = true;
});
util.inherits(PackerAsync, Stream);
&nbsp;
PackerAsync.prototype.pack = function (data, width, height, gamma) {
  // Signature
  this.emit("data", Buffer.from(constants.PNG_SIGNATURE));
  this.emit("data", this._packer.packIHDR(width, height));
&nbsp;
  if (gamma) {
    this.emit("data", this._packer.packGAMA(gamma));
  }
&nbsp;
  let filteredData = this._packer.filterData(data, width, height);
&nbsp;
  // compress it
  this._deflate.on("error", this.emit.bind(this, "error"));
&nbsp;
  this._deflate.on(
    "data",
    function (compressedData) {
      this.emit("data", this._packer.packIDAT(compressedData));
    }.bind(this)
  );
&nbsp;
  this._deflate.on(
    "end",
    function () {
      this.emit("data", this._packer.packIEND());
      this.emit("end");
    }.bind(this)
  );
&nbsp;
  this._deflate.end(filteredData);
};
&nbsp;</pre></td></tr></table></pre>

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