add steps api functions (#293)

* add steps api functions

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

* optimize getHeight and getWidth

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

* add tests

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

* update tests

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

dist/image-sequencer.js

@@ -48280,7 +48280,7 @@ module.exports = function Dynamic(options, UI, util) {
     // save first image's pixels
     var priorStep = this.getStep(-2);
 
-    getPixels(priorStep.output.src, function (err, pixels) {
+    getPixels(priorStep.output.src, function(err, pixels) {
       options.firstImagePixels = pixels;
 
       function changePixel(r2, g2, b2, a2, x, y) {
@@ -48302,7 +48302,7 @@ module.exports = function Dynamic(options, UI, util) {
 
       }
 
-      // run PixelManipulatin on second image's pixels 
+      // run PixelManipulatin on second image's pixels
       return require('../_nomodule/PixelManipulation.js')(input, {
         output: output,
         changePixel: changePixel,
@@ -50236,21 +50236,52 @@ module.exports = function GetFormat(src) {
 
 },{}],198:[function(require,module,exports){
 module.exports = {
-    getPreviousStep : function () {
+    getPreviousStep: function() {
         return this.getStep(-1);
     },
 
-    getNextStep : function() {
+    getNextStep: function() {
         return this.getStep(1);
     },
 
-    getInput : function(offset){
+    getInput: function(offset) {
-        if(offset + this.getIndex() === 0) offset++;
+        if (offset + this.getIndex() === 0) offset++;
         return this.getStep(offset - 1).output;
     },
 
-    getOuput : function(offset){
+    getOutput: function(offset) {
         return this.getStep(offset).output;
+    },
+
+    getOptions: function() {
+        return this.getStep(0).options;
+    },
+
+    setOptions: function(optionsObj) {
+        let options = this.getStep(0).options;
+        for (let key in optionsObj) {
+            if (options[key]) options[key] = optionsObj[key];
+        }
+    },
+
+    getFormat: function() {
+        return this.getStep(-1).output.format;
+    },
+
+    getHeight: function(callback) {
+        let img = new Image();
+        img.onload = function() {
+            callback(img.height);
+        };
+        img.src = this.getInput(0).src;
+    },
+
+    getWidth: function(callback) {
+        let img = new Image();
+        img.onload = function() {
+            callback(img.width);
+        };
+        img.src = this.getInput(0).src;
     }
 }
 },{}]},{},[139]);

src/modules/Blend/Module.js

@@ -20,7 +20,7 @@ module.exports = function Dynamic(options, UI, util) {
     // save first image's pixels
     var priorStep = this.getStep(-2);
 
-    getPixels(priorStep.output.src, function (err, pixels) {
+    getPixels(priorStep.output.src, function(err, pixels) {
       options.firstImagePixels = pixels;
 
       function changePixel(r2, g2, b2, a2, x, y) {
@@ -42,7 +42,7 @@ module.exports = function Dynamic(options, UI, util) {
 
       }
 
-      // run PixelManipulatin on second image's pixels 
+      // run PixelManipulatin on second image's pixels
       return require('../_nomodule/PixelManipulation.js')(input, {
         output: output,
         changePixel: changePixel,

src/util/getStep.js

@@ -1,18 +1,49 @@
 module.exports = {
-    getPreviousStep : function () {
+    getPreviousStep: function() {
         return this.getStep(-1);
     },
 
-    getNextStep : function() {
+    getNextStep: function() {
         return this.getStep(1);
     },
 
-    getInput : function(offset){
+    getInput: function(offset) {
-        if(offset + this.getIndex() === 0) offset++;
+        if (offset + this.getIndex() === 0) offset++;
         return this.getStep(offset - 1).output;
     },
 
-    getOuput : function(offset){
+    getOutput: function(offset) {
         return this.getStep(offset).output;
+    },
+
+    getOptions: function() {
+        return this.getStep(0).options;
+    },
+
+    setOptions: function(optionsObj) {
+        let options = this.getStep(0).options;
+        for (let key in optionsObj) {
+            if (options[key]) options[key] = optionsObj[key];
+        }
+    },
+
+    getFormat: function() {
+        return this.getStep(-1).output.format;
+    },
+
+    getHeight: function(callback) {
+        let img = new Image();
+        img.onload = function() {
+            callback(img.height);
+        };
+        img.src = this.getInput(0).src;
+    },
+
+    getWidth: function(callback) {
+        let img = new Image();
+        img.onload = function() {
+            callback(img.width);
+        };
+        img.src = this.getInput(0).src;
     }
 }

test/modules/testModule/Module.js

@@ -1,14 +1,27 @@
-module.exports = function testModule(options, UI) {
+module.exports = function Dynamic(options, UI, util) {
+  // Tests for functions that are available inside modules only
 
   var output;
+
+  // This function is called on every draw.
   function draw(input, callback) {
 
-    var output = function(input) {
+    var step = this;
-      return input;
+
+    if (this.getPreviousStep().options.name != "invert") throw new Error("getPreviousStep not working");
+    if (this.getNextStep().options.name != "invert") throw new Error("getNextStep not working");
+    if (this.getInput(0) != this.getOutput(-1)) throw new Error("getInput and getOuput now working")
+    if (this.getFormat() != "jpeg") throw new Error("getFormat not working");
+    if (this.getOptions().name != "test") throw new Error("getOptions not working");
+    this.setOptions({ name: "test-1" });
+    if (this.getOptions().name != "test-1") throw new Error("setOptions not working not working");
+    this.getHeight(((h) => { if (h != 16) throw new Error("getHeight not working") }));
+    this.getWidth((w) => { if (w != 16) throw new Error("getWidth not working") });
+
+    function output(image, datauri, mimetype) {
+      step.output = input;
     }
 
-    this.output = output(input); // run the output and assign it to this.output
-    callback();
   }
 
   return {

test/modules/testModule/info.json

@@ -1,5 +1,5 @@
 {
     "name": "test",
-    "description": "Outputs the same image.",
+    "description": "Functions that are scoped inside modules are tested with this. This Module is dynamically loaded.",
     "inputs": {}
 }