mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-02 07:05:24 +00:00
81 lines
2.9 KiB
C++
81 lines
2.9 KiB
C++
/* -*- 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 http://mozilla.org/MPL/2.0/. */
|
|
|
|
#ifndef GFX_READBACKPROCESSOR_H
|
|
#define GFX_READBACKPROCESSOR_H
|
|
|
|
#include <stdint.h> // for uint64_t
|
|
#include "nsRect.h" // for mozilla::gfx::IntRect
|
|
#include "nsRegionFwd.h" // for nsIntRegion
|
|
#include "nsTArray.h" // for nsTArray
|
|
|
|
namespace mozilla {
|
|
namespace layers {
|
|
|
|
class ContainerLayer;
|
|
class ReadbackLayer;
|
|
class PaintedLayer;
|
|
|
|
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 PaintedLayers).
|
|
*
|
|
* This method recomputes the relationship between ReadbackLayers and
|
|
* sibling layers, and dispatches changes to ReadbackLayers. Except that
|
|
* if a PaintedLayer needs its contents sent to some ReadbackLayer, we'll
|
|
* just record that internally and later the PaintedLayer should call
|
|
* GetPaintedLayerUpdates 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 PaintedLayer should send its contents to.
|
|
*/
|
|
ReadbackLayer* mLayer;
|
|
/**
|
|
* The rectangle of content that it should send, in the PaintedLayer's
|
|
* coordinate system. This rectangle is guaranteed to be in the PaintedLayer's
|
|
* visible region. Translate it to mLayer's coordinate system
|
|
* by adding mLayer->GetBackgroundLayerOffset().
|
|
*/
|
|
gfx::IntRect mUpdateRect;
|
|
/**
|
|
* The sequence counter value to use when calling DoUpdate
|
|
*/
|
|
uint64_t 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 PaintedLayers
|
|
* that have been marked UsedForReadback().
|
|
* Each Update's mLayer's mBackgroundLayer will have been set to aLayer.
|
|
* If a PaintedLayer doesn't call GetPaintedLayerUpdates, then all the
|
|
* ReadbackLayers that needed data from that PaintedLayer will be marked
|
|
* as having unknown backgrounds.
|
|
* @param aUpdateRegion if non-null, this region is set to the union
|
|
* of the mUpdateRects.
|
|
*/
|
|
void GetPaintedLayerUpdates(PaintedLayer* aLayer,
|
|
nsTArray<Update>* aUpdates,
|
|
nsIntRegion* aUpdateRegion = nullptr);
|
|
|
|
~ReadbackProcessor();
|
|
|
|
protected:
|
|
void BuildUpdatesForLayer(ReadbackLayer* aLayer);
|
|
|
|
nsTArray<Update> mAllUpdates;
|
|
};
|
|
|
|
} // namespace layers
|
|
} // namespace mozilla
|
|
|
|
#endif /* GFX_READBACKPROCESSOR_H */
|