The Tor Browser / file revision

 /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-

  * This Source Code Form is subject to the terms of the Mozilla Public

  * License, v. 2.0. If a copy of the MPL was not distributed with this

  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

 package org.mozilla.gecko.gfx;

 public class VirtualLayer extends Layer {

     public VirtualLayer(IntSize size) {

         super(size);

     }

     @Override

     public void draw(RenderContext context) {

         // No-op.

     }

     void setPositionAndResolution(int left, int top, int right, int bottom, float newResolution) {

         // This is an optimized version of the following code:

         // beginTransaction();

         // try {

         //     setPosition(new Rect(left, top, right, bottom));

         //     setResolution(newResolution);

         //     performUpdates(null);

         // } finally {

         //     endTransaction();

         // }

         // it is safe to drop the transaction lock in this instance (i.e. for the

         // VirtualLayer that is just a shadow of what gecko is painting) because

         // the position and resolution of this layer are always touched on the compositor

         // thread, and therefore do not require synchronization.

         mPosition.set(left, top, right, bottom);

         mResolution = newResolution;

     }

 }