Fixed CanvasRenderer regression + added unit test

src/js/rendering/CanvasRenderer.js

@@ -50,10 +50,11 @@
   };
 
   ns.CanvasRenderer.prototype.renderLine_ = function (color, x, y, width, context) {
-    if(color != Constants.TRANSPARENT_COLOR) {
+    if(color == Constants.TRANSPARENT_COLOR) {
+      color = this.transparentColor_;
+    }
     context.fillStyle = color;
     context.fillRect(x, y, 1, width);
-    }
   };
 
   ns.CanvasRenderer.prototype.createCanvas_ = function (zoom) {

test/js/rendering/CanvasRendererTest.js

@@ -0,0 +1,39 @@
+describe("Canvas Renderer test", function() {
+  var BLACK = '#000000';
+  var WHITE = '#ffffff';
+  var TRANS = Constants.TRANSPARENT_COLOR;
+
+  var toFrameGrid = function (normalGrid) {
+    var frameGrid = [];
+    var w = normalGrid[0].length;
+    var h = normalGrid.length;
+    for (var x = 0 ; x < w ; x++) {
+      frameGrid[x] = [];
+      for (var y = 0 ; y < h ; y++) {
+        frameGrid[x][y] = normalGrid[y][x];
+      }
+    }
+    return frameGrid;
+  };
+
+  beforeEach(function() {});
+  afterEach(function() {});
+
+  it("draws transparent as white by default", function() {
+    // create frame
+    var frame = pskl.model.Frame.fromPixelGrid(toFrameGrid([
+      [BLACK, TRANS],
+      [TRANS, BLACK]
+    ]));
+
+    var renderer = new pskl.rendering.CanvasRenderer(frame, 1);
+    var canvas = renderer.render();
+
+    var frameFromCanvas = pskl.utils.FrameUtils.createFromImage(canvas);
+
+    expect(frameFromCanvas.getPixel(0,0)).toBe(BLACK);
+    expect(frameFromCanvas.getPixel(0,1)).toBe(WHITE);
+    expect(frameFromCanvas.getPixel(1,0)).toBe(WHITE);
+    expect(frameFromCanvas.getPixel(1,1)).toBe(BLACK);
+  });
+});