image-sequencer/src/modules/CanvasResize/Module.js

/*
* Changes the Canvas Size
*/
module.exports = function canvasResize(options, UI) {

    var defaults = require('./../../util/getDefaults.js')(require('./info.json'));
    var output;



    function draw(input, callback, progressObj) {

        options.width = options.width || defaults.width;
        options.height = options.height || defaults.height;
        options.x = options.x || defaults.x;
        options.y = options.y || defaults.y;

        progressObj.stop(true);
        progressObj.overrideFlag = true;

        var step = this;

        function extraManipulation(pixels) {

            let newPixels = require('ndarray')(new Uint8Array(4 * options.width * options.height).fill(255), [options.width, options.height, 4]);
            let iMax = options.width - options.x,
                jMax = options.height - options.y;
            for (let i = 0; i < iMax && i < pixels.shape[0]; i++) {
                for (let j = 0; j < jMax && j < pixels.shape[1]; j++) {
                    let x = i + options.x, y = j + options.y;
                    newPixels.set(x, y, 0, pixels.get(i, j, 0));
                    newPixels.set(x, y, 1, pixels.get(i, j, 1));
                    newPixels.set(x, y, 2, pixels.get(i, j, 2));
                    newPixels.set(x, y, 3, pixels.get(i, j, 3));
                }
            }
            return newPixels;
        }

        function output(image, datauri, mimetype) {

            // This output is accessible by Image Sequencer
            step.output = { src: datauri, format: mimetype };

        }

        return require('../_nomodule/PixelManipulation.js')(input, {
            output: output,
            extraManipulation: extraManipulation,
            format: input.format,
            image: options.image,
            inBrowser: options.inBrowser,
            callback: callback
        });

    }
    return {
        options: options,
        draw: draw,
        output: output,
        UI: UI
    }
}