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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /gfx/layers/ReadbackProcessor.h
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
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+/* -*- 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 */