pixler.js

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
var __generator = (this && this.__generator) || function (thisArg, body) {
    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
    return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
    function verb(n) { return function (v) { return step([n, v]); }; }
    function step(op) {
        if (f) throw new TypeError("Generator is already executing.");
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            if (y = 0, t) op = [op[0] & 2, t.value];
            switch (op[0]) {
                case 0: case 1: t = op; break;
                case 4: _.label++; return { value: op[1], done: false };
                case 5: _.label++; y = op[1]; op = [0]; continue;
                case 7: op = _.ops.pop(); _.trys.pop(); continue;
                default:
                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
                    if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
                    if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
                    if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
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        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
    }
};
Object.defineProperty(exports, "__esModule", { value: true });
var pixler = /** @class */ (function () {
    function pixler() {
    }
    pixler.prototype.pixelate = function (source, size, callback) {
        return __awaiter(this, void 0, void 0, function () {
            var url, image;
            return __generator(this, function (_a) {
                url = typeof source === 'string' ? source : window.URL.createObjectURL(source);
                size = Math.abs(size); // positive only
                image = new Image();
                image.src = url;
                image.crossOrigin = "anonymous";
                image.onload = function () {
                    var origin = { width: image.naturalWidth, height: image.naturalHeight };
                    var pixelated = { width: image.naturalWidth / size, height: image.naturalHeight / size };
                    var canvas = document.createElement('canvas');
                    canvas.width = origin.width;
                    canvas.height = origin.height;
                    var context = canvas.getContext('2d');
                    if (context) {
                        context.mozImageSmoothingEnabled = false;
                        context.webkitImageSmoothingEnabled = false;
                        context.oImageSmoothingEnabled = false;
                        context.imageSmoothingEnabled = false;
                        canvas.style.cssText = 'image-rendering: optimizeSpeed;' + // FireFox < 6.0
                            'image-rendering: -moz-crisp-edges;' + // FireFox
                            'image-rendering: -o-crisp-edges;' + // Opera
                            'image-rendering: -webkit-crisp-edges;' + // Chrome
                            'image-rendering: crisp-edges;' + // Chrome
                            'image-rendering: -webkit-optimize-contrast;' + // Safari
                            'image-rendering: pixelated; ' + // Future browsers
                            '-ms-interpolation-mode: nearest-neighbor;'; // IE
                        context.drawImage(image, 0, 0, pixelated.width, pixelated.height);
                        context.drawImage(canvas, 0, 0, pixelated.width, pixelated.height, 0, 0, origin.width, origin.height);
                        callback(canvas.toDataURL('image/png'));
                    }
                };
                return [2 /*return*/];
            });
        });
    };
    return pixler;
}());
exports.default = new pixler();
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