author Aryeh Gregor <>
Mon, 30 Jul 2012 17:20:58 +0300
changeset 101232 b5c4b792f3f2a047e3517472d72842a76afb77cd
parent 94846 f4157e8c410708d76703f19e4dfb61859bfe32d8
child 103252 3000e30d082c63adf8222aa82e47245646806ea6
permissions -rw-r--r--
Bug 777292 part 2 - Change all nsnull to nullptr

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * 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 */


#include "ReadbackLayer.h"
#include "ThebesLayerBuffer.h"
#include "nsTArray.h"

namespace mozilla {
namespace layers {

class ReadbackProcessor {
   * Called by the container before processing any child layers. Call this
   * if any child layer might have changed in any way (other than content-only
   * changes to layers other than ColorLayers and ThebesLayers).
   * This method recomputes the relationship between ReadbackLayers and
   * sibling layers, and dispatches changes to ReadbackLayers. Except that
   * if a ThebesLayer needs its contents sent to some ReadbackLayer, we'll
   * just record that internally and later the ThebesLayer should call
   * GetThebesLayerUpdates when it paints, to find out which rectangle needs
   * to be sent, and the ReadbackLayer it needs to be sent to.
  void BuildUpdates(ContainerLayer* aContainer);

  struct Update {
     * The layer a ThebesLayer should send its contents to.
    ReadbackLayer* mLayer;
     * The rectangle of content that it should send, in the ThebesLayer's
     * coordinate system. This rectangle is guaranteed to be in the ThebesLayer's
     * visible region. Translate it to mLayer's coordinate system
     * by adding mLayer->GetBackgroundLayerOffset().
    nsIntRect      mUpdateRect;
     * The sequence counter value to use when calling DoUpdate
    PRUint64       mSequenceCounter;
   * Appends any ReadbackLayers that need to be updated, and the rects that
   * need to be updated, to aUpdates. Only need to call this for ThebesLayers
   * that have been marked UsedForReadback().
   * Each Update's mLayer's mBackgroundLayer will have been set to aLayer.
   * If a ThebesLayer doesn't call GetThebesLayerUpdates, then all the
   * ReadbackLayers that needed data from that ThebesLayer will be marked
   * as having unknown backgrounds.
   * @param aUpdateRegion if non-null, this region is set to the union
   * of the mUpdateRects.
  void GetThebesLayerUpdates(ThebesLayer* aLayer,
                             nsTArray<Update>* aUpdates,
                             nsIntRegion* aUpdateRegion = nullptr);


  void BuildUpdatesForLayer(ReadbackLayer* aLayer);

  nsTArray<Update> mAllUpdates;