Made Requested Changes

package.json

@@ -24,6 +24,7 @@
     "fisheyegl": "^0.1.2",
     "font-awesome": "~4.5.0",
     "jquery": "~2",
+    "jsqr": "^0.2.2",
     "urify": "^2.1.0"
   },
   "devDependencies": {

src/Modules.js

@@ -9,5 +9,6 @@ module.exports = {
   'invert': require('./modules/Invert/Module'),
   'crop': require('./modules/Crop/Module'),
   'segmented-colormap': require('./modules/SegmentedColormap/Module'),
+  'decode-qr': require('./modules/DecodeQr/Module'),
   'fisheye-gl': require('./modules/FisheyeGl/Module')
 }

src/modules/Crop/Crop.js

@@ -17,6 +17,8 @@ module.exports = function Crop(input,options,callback) {
     pixels.shape = [w,h,4];
     pixels.stride[1] = 4*w;
 
+    options.format = input.format;
+
     var chunks = [];
     var totalLength = 0;
     var r = savePixels(pixels, options.format);

src/modules/DecodeQr/Module.js

@@ -0,0 +1,36 @@
+/*
+ * Decodes QR from a given image.
+ */
+module.exports = function DoNothing(options,UI) {
+  options = options || {};
+  options.title = "Decode QR Code";
+  UI.onSetup(options.step);
+  var output;
+  var jsQR = require('jsqr');
+  var getPixels = require('get-pixels');
+
+  function draw(input,callback) {
+
+    UI.onDraw(options.step);
+
+    const step = this;
+    getPixels(input.src,function(err,pixels){
+      if(err) throw err;
+      var w = pixels.shape[0];
+      var h = pixels.shape[1];
+      var decoded = jsQR.decodeQRFromImage(pixels.data,w,h);
+      step.output = input;
+      step.output.data = decoded;
+      callback();
+      options.step.output = input.src;
+      UI.onComplete(options.step);
+    });
+  }
+
+  return {
+    options: options,
+    draw: draw,
+    output: output,
+    UI: UI
+  }
+}

test/image-manip.js

@@ -10,8 +10,9 @@ require('../src/ImageSequencer.js');
 //require image files as DataURLs so they can be tested alike on browser and Node.
 var sequencer = ImageSequencer({ ui: false });
 
-var test_png = require('../examples/images/test.png.js');
+var qr = require('./images/IS-QR.js');
-var test_gif = require('../examples/images/test.gif.js');
+var test_png = require('./images/test.png.js');
+var test_gif = require('./images/test.gif.js');
 
 sequencer.loadImages(test_png);
 sequencer.addSteps(['do-nothing-pix','invert','invert']);
@@ -32,6 +33,19 @@ test("Twice inverted image is identical to original image", function (t) {
   t.end();
 });
 
+test("Decode QR module works properly :: setup", function (t) {
+  sequencer.loadImage(qr,function(){
+    this.addSteps('decode-qr').run(function(){
+      t.end();
+    });
+  })
+});
+
+test("Decode QR module works properly :: teardown", function (t) {
+  t.equal("http://github.com/publiclab/image-sequencer",sequencer.images.image2.steps[1].output.data);
+  t.end();
+});
+
 test("PixelManipulation works for PNG images", function (t) {
   sequencer.loadImages(test_png,function(){
     this.addSteps('invert').run(function(out){

test/image-sequencer.js

@@ -42,11 +42,19 @@ test('loadImages loads a DataURL image and creates a step.', function (t){
 
 if(!sequencer.options.inBrowser)
   test('loadImage loads an image from URL and creates a step. (NodeJS)', function (t){
+    require('dns').resolve('www.github.com', function(err) {
+      if (err) {
+        console.log("Test aborted due to no internet");
+        t.end();
+      }
+      else {
         sequencer.loadImage('URL','https://ccpandhare.github.io/image-sequencer/examples/images/red.jpg', function(){
           t.equal(sequencer.images.URL.steps.length, 1, "Initial Step Created");
           t.equal(typeof(sequencer.images.URL.steps[0].output.src), "string", "Initial output exists");
           t.end();
         });
+      }
+    });
   });
 
 if(!sequencer.options.inBrowser)