feature : zoom :

- Extracted layers rendering logic from DrawingController to dedicated
  class
- Turned RendererManager into Composite renderer (extends
  AbstractRenderer)
- AbstractRenderer no longer contains a render(frame) method, implementing
  the render differs too much between my current renderers to impose a
  single signature, but I should improve this later if too much time on ma
  hands

js/rendering/AbstractRenderer.js

@@ -3,7 +3,6 @@
 
   ns.AbstractRenderer = function () {};
 
-  ns.AbstractRenderer.prototype.render =         function (frame)  {throw 'abstract method should be implemented';};
   ns.AbstractRenderer.prototype.clear =          function ()       {throw 'abstract method should be implemented';};
 
   ns.AbstractRenderer.prototype.getCoordinates = function (x, y)   {throw 'abstract method should be implemented';};

js/rendering/RendererManager.js

@@ -1,30 +0,0 @@
-(function () {
-  var ns = $.namespace('pskl.rendering');
-
-  ns.RendererManager = function () {
-    this.renderers = [];
-  };
-
-  ns.RendererManager.prototype.add = function (renderer) {
-    this.renderers.push(renderer);
-    return this;
-  };
-
-  ns.RendererManager.prototype.setZoom = function (zoom) {
-    this.renderers.forEach(function (renderer) {
-      renderer.setZoom(zoom);
-    });
-  };
-
-  ns.RendererManager.prototype.setDisplaySize = function (w, h) {
-    this.renderers.forEach(function (renderer) {
-      renderer.setDisplaySize(w, h);
-    });
-  };
-
-  ns.RendererManager.prototype.moveOffset = function (offsetX, offsetY) {
-    this.renderers.forEach(function (renderer) {
-      renderer.moveOffset(offsetX, offsetY);
-    });
-  };
-})();

js/rendering/frame/FrameRenderer.js

@@ -61,6 +61,8 @@
     $.subscribe(Events.USER_SETTINGS_CHANGED, $.proxy(this.onUserSettingsChange_, this));
   };
 
+  pskl.utils.inherit(pskl.rendering.frame.FrameRenderer, pskl.rendering.AbstractRenderer);
+
   ns.FrameRenderer.prototype.render = function (frame) {
     if (frame) {
       this.clear();