pixelbutler/build/loaders/BitmapLoader.js

Low-res bitmap render engine for big screens

'use strict';
var Bitmap = require('../core/Bitmap');
var ImageDataLoader = require('./ImageDataLoader');
var BitmapLoader = (function () {
    function BitmapLoader(url, useAlpha) {
        if (typeof useAlpha === "undefined") { useAlpha = false; }
        this.url = url;
        this.useAlpha = useAlpha;
    }
    BitmapLoader.prototype.load = function (callback) {
        var _this = this;
        new ImageDataLoader(this.url).load(function (err, image) {
            if (err) {
                callback(err, null);
                return;
            }
            if (_this.useAlpha) {
                callback(null, new Bitmap(image.width, image.height, true, image.data.buffer));
            } else {
                var bitmap = new Bitmap(image.width, image.height, false);
                var data = image.data;
                var width = image.width;
                for (var iy = 0; iy < image.height; iy++) {
                    for (var ix = 0; ix < width; ix++) {
                        var read = (iy * width + ix) * 4;
                        var write = (iy * width + ix) * 3;
                        bitmap.data[write] = data[read];
                        bitmap.data[write + 1] = data[read + 1];
                        bitmap.data[write + 2] = data[read + 2];
                    }
                }
                callback(null, bitmap);
            }
        });
    };
    return BitmapLoader;
})();
module.exports = BitmapLoader;