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| Current File : //proc/self/root/home/saurabh/.npm/_npx/249ca9fcd30c476a/node_modules/pngjs/lib/packer-async.js |
'use strict';
var util = require('util');
var Stream = require('stream');
var constants = require('./constants');
var Packer = require('./packer');
var PackerAsync = module.exports = function(opt) {
Stream.call(this);
var options = opt || {};
this._packer = new Packer(options);
this._deflate = this._packer.createDeflate();
this.readable = true;
};
util.inherits(PackerAsync, Stream);
PackerAsync.prototype.pack = function(data, width, height, gamma) {
// Signature
this.emit('data', new Buffer(constants.PNG_SIGNATURE));
this.emit('data', this._packer.packIHDR(width, height));
if (gamma) {
this.emit('data', this._packer.packGAMA(gamma));
}
var filteredData = this._packer.filterData(data, width, height);
// compress it
this._deflate.on('error', this.emit.bind(this, 'error'));
this._deflate.on('data', function(compressedData) {
this.emit('data', this._packer.packIDAT(compressedData));
}.bind(this));
this._deflate.on('end', function() {
this.emit('data', this._packer.packIEND());
this.emit('end');
}.bind(this));
this._deflate.end(filteredData);
};
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