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77 lines
2.6 KiB
C++
77 lines
2.6 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef GFX_READBACKPROCESSOR_H
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#define GFX_READBACKPROCESSOR_H
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#include "ThebesLayerBuffer.h"
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#include "nsTArray.h"
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namespace mozilla {
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namespace layers {
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class ContainerLayer;
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class ReadbackLayer;
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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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uint64_t 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 = nullptr);
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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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