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106 lines
4.1 KiB
C++
106 lines
4.1 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Corporation code.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2011
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Robert O'Callahan <robert@ocallahan.org>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef GFX_READBACKPROCESSOR_H
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#define GFX_READBACKPROCESSOR_H
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#include "ReadbackLayer.h"
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#include "ThebesLayerBuffer.h"
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namespace mozilla {
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namespace layers {
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class ReadbackProcessor {
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public:
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/**
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* Called by the container before processing any child layers. Call this
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* if any child layer might have changed in any way (other than content-only
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* changes to layers other than ColorLayers and ThebesLayers).
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*
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* This method recomputes the relationship between ReadbackLayers and
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* sibling layers, and dispatches changes to ReadbackLayers. Except that
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* if a ThebesLayer needs its contents sent to some ReadbackLayer, we'll
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* just record that internally and later the ThebesLayer should call
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* GetThebesLayerUpdates when it paints, to find out which rectangle needs
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* to be sent, and the ReadbackLayer it needs to be sent to.
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*/
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void BuildUpdates(ContainerLayer* aContainer);
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struct Update {
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/**
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* The layer a ThebesLayer should send its contents to.
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*/
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ReadbackLayer* mLayer;
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/**
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* The rectangle of content that it should send, in the ThebesLayer's
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* coordinate system. This rectangle is guaranteed to be in the ThebesLayer's
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* visible region. Translate it to mLayer's coordinate system
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* by adding mLayer->GetBackgroundLayerOffset().
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*/
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nsIntRect mUpdateRect;
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/**
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* The sequence counter value to use when calling DoUpdate
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*/
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PRUint64 mSequenceCounter;
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};
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/**
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* Appends any ReadbackLayers that need to be updated, and the rects that
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* need to be updated, to aUpdates. Only need to call this for ThebesLayers
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* that have been marked UsedForReadback().
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* Each Update's mLayer's mBackgroundLayer will have been set to aLayer.
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* If a ThebesLayer doesn't call GetThebesLayerUpdates, then all the
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* ReadbackLayers that needed data from that ThebesLayer will be marked
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* as having unknown backgrounds.
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* @param aUpdateRegion if non-null, this region is set to the union
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* of the mUpdateRects.
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*/
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void GetThebesLayerUpdates(ThebesLayer* aLayer,
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nsTArray<Update>* aUpdates,
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nsIntRegion* aUpdateRegion = nsnull);
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~ReadbackProcessor();
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protected:
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void BuildUpdatesForLayer(ReadbackLayer* aLayer);
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nsTArray<Update> mAllUpdates;
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};
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}
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}
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#endif /* GFX_READBACKPROCESSOR_H */
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