add canvas resize module (#994)

* add canvas resize module

Signed-off-by: tech4GT <varun.gupta1798@gmail.com>

* add tests

Signed-off-by: tech4GT <varun.gupta1798@gmail.com>

src/modules/CanvasResize/Module.js

@@ -0,0 +1,63 @@
+/*
+* 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
+    }
+}