Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | 1x 1x 1x 1x 1x 353x 353x 353x 353x 353x 1x 1x 325x 325x 325x 290x 325x 325x 325x 652x 325x 325x 325x 325x | "use strict";
let util = require("util");
let Stream = require("stream");
let constants = require("./constants");
let Packer = require("./packer");
let PackerAsync = (module.exports = function (opt) {
Stream.call(this);
let 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", Buffer.from(constants.PNG_SIGNATURE));
this.emit("data", this._packer.packIHDR(width, height));
if (gamma) {
this.emit("data", this._packer.packGAMA(gamma));
}
let 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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