moebius-web

tools/export.js

function exportTool(editor) {
    "use strict";

    function createElement(elementName, args) {
        var element;

        args = args || {};
        element = document.createElement(elementName);

        Object.getOwnPropertyNames(args).forEach(function (name) {
            if (typeof args[name] === "object") {
                Object.getOwnPropertyNames(args[name]).forEach(function (subName) {
                    element[name][subName] = args[name][subName];
                });
            } else {
                element[name] = args[name];
            }
        });

        return element;
    }

    function toDataURL(bytes) {
        return "data:application/octet-stream;base64," + btoa(String.fromCharCode.apply(null, bytes));
    }

    function toBinFormat(input) {
        var output, inputIndex, outputIndex, highest, end;
        highest = 26;
        for (inputIndex = 0; inputIndex < input.length; inputIndex += 3) {
            if (input[inputIndex]) {
                highest = Math.max(Math.ceil(inputIndex / 240), highest);
            }
        }
        output = new Uint8Array((input.length / 3 * 2) + 11);
        output.set(new Uint8Array([88, 66, 73, 78, 26, 80, 0, highest, 0, 16, 0]), 0);
        for (inputIndex = 0, outputIndex = 11, end = highest * 80 * 3; inputIndex < end; inputIndex += 3, outputIndex += 2) {
            output[outputIndex] = input[inputIndex];
            output[outputIndex + 1] = input[inputIndex + 1] + (input[inputIndex + 2] << 4);
        }
        return output;
    }

    function removeLink() {
        var divExport;
        divExport = document.getElementById("export");
        if (divExport.firstChild) {
            divExport.removeChild(divExport.firstChild);
        }
    }

    function init() {
        var anchor;
        removeLink();
        anchor = createElement("a", {"href": toDataURL(toBinFormat(editor.image)), "onclick": removeLink, "textContent": "Download", "download": "ansiedit.xb"});
        document.getElementById("export").appendChild(anchor);
        return false;
    }

    function toString() {
        return "Export";
    }

    return {
        "init": init,
        "toString": toString,
        "uid": "export"
    };
}