gecko/gfx/layers/ReadbackProcessor.h

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Corporation code.
*
* The Initial Developer of the Original Code is Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2011
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Robert O'Callahan <robert@ocallahan.org>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef GFX_READBACKPROCESSOR_H
#define GFX_READBACKPROCESSOR_H
#include "ReadbackLayer.h"
#include "ThebesLayerBuffer.h"
namespace mozilla {
namespace layers {
class ReadbackProcessor {
public:
/**
* 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 = nsnull);
~ReadbackProcessor();
protected:
void BuildUpdatesForLayer(ReadbackLayer* aLayer);
nsTArray<Update> mAllUpdates;
};
}
}
#endif /* GFX_READBACKPROCESSOR_H */