1 files changed, 52 insertions, 0 deletions
diff --git a/third_party/webkit/PerformanceTests/MotionMark/tests/master/resources/canvas-stage.js b/third_party/webkit/PerformanceTests/MotionMark/tests/master/resources/canvas-stage.js
new file mode 100644
index 0000000000..22002eccd6
--- /dev/null
+++ b/third_party/webkit/PerformanceTests/MotionMark/tests/master/resources/canvas-stage.js
@@ -0,0 +1,52 @@
+SimpleCanvasStage = Utilities.createSubclass(Stage,
+    function(canvasObject)
+    {
+        Stage.call(this);
+        this._canvasObject = canvasObject;
+        this.objects = [];
+        this.offsetIndex = 0;
+    }, {
+
+    initialize: function(benchmark, options)
+    {
+        Stage.prototype.initialize.call(this, benchmark, options);
+        this.context = this.element.getContext("2d");
+    },
+
+    tune: function(count)
+    {
+        if (count == 0)
+            return;
+
+        if (count < 0) {
+            this.offsetIndex = Math.min(this.offsetIndex - count, this.objects.length);
+            return;
+        }
+
+        var newIndex = this.offsetIndex - count;
+        if (newIndex < 0) {
+            this.offsetIndex = 0;
+            newIndex = -newIndex;
+            for (var i = 0; i < newIndex; ++i) {
+                if (this._canvasObject.constructor === Array)
+                    this.objects.push(new (Stage.randomElementInArray(this._canvasObject))(this));
+                else
+                    this.objects.push(new this._canvasObject(this));
+            }
+        } else
+            this.offsetIndex = newIndex;
+    },
+
+    animate: function()
+    {
+        var context = this.context;
+        context.clearRect(0, 0, this.size.x, this.size.y);
+        for (var i = this.offsetIndex, length = this.objects.length; i < length; ++i)
+            this.objects[i].draw(context);
+    },
+
+    complexity: function()
+    {
+        return this.objects.length - this.offsetIndex;
+    }
+});