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comparison: gfx/layers/ReadbackProcessor.h
gfx/layers/ReadbackProcessor.h
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
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| -1:000000000000 | 0:f91bbc8dd7de |
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| 1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- | |
| 2 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #ifndef GFX_READBACKPROCESSOR_H | |
| 7 #define GFX_READBACKPROCESSOR_H | |
| 8 | |
| 9 #include <stdint.h> // for uint64_t | |
| 10 #include "nsRect.h" // for nsIntRect | |
| 11 #include "nsTArray.h" // for nsTArray | |
| 12 | |
| 13 class nsIntRegion; | |
| 14 | |
| 15 namespace mozilla { | |
| 16 namespace layers { | |
| 17 | |
| 18 class ContainerLayer; | |
| 19 class ReadbackLayer; | |
| 20 class ThebesLayer; | |
| 21 | |
| 22 class ReadbackProcessor { | |
| 23 public: | |
| 24 /** | |
| 25 * Called by the container before processing any child layers. Call this | |
| 26 * if any child layer might have changed in any way (other than content-only | |
| 27 * changes to layers other than ColorLayers and ThebesLayers). | |
| 28 * | |
| 29 * This method recomputes the relationship between ReadbackLayers and | |
| 30 * sibling layers, and dispatches changes to ReadbackLayers. Except that | |
| 31 * if a ThebesLayer needs its contents sent to some ReadbackLayer, we'll | |
| 32 * just record that internally and later the ThebesLayer should call | |
| 33 * GetThebesLayerUpdates when it paints, to find out which rectangle needs | |
| 34 * to be sent, and the ReadbackLayer it needs to be sent to. | |
| 35 */ | |
| 36 void BuildUpdates(ContainerLayer* aContainer); | |
| 37 | |
| 38 struct Update { | |
| 39 /** | |
| 40 * The layer a ThebesLayer should send its contents to. | |
| 41 */ | |
| 42 ReadbackLayer* mLayer; | |
| 43 /** | |
| 44 * The rectangle of content that it should send, in the ThebesLayer's | |
| 45 * coordinate system. This rectangle is guaranteed to be in the ThebesLayer's | |
| 46 * visible region. Translate it to mLayer's coordinate system | |
| 47 * by adding mLayer->GetBackgroundLayerOffset(). | |
| 48 */ | |
| 49 nsIntRect mUpdateRect; | |
| 50 /** | |
| 51 * The sequence counter value to use when calling DoUpdate | |
| 52 */ | |
| 53 uint64_t mSequenceCounter; | |
| 54 }; | |
| 55 /** | |
| 56 * Appends any ReadbackLayers that need to be updated, and the rects that | |
| 57 * need to be updated, to aUpdates. Only need to call this for ThebesLayers | |
| 58 * that have been marked UsedForReadback(). | |
| 59 * Each Update's mLayer's mBackgroundLayer will have been set to aLayer. | |
| 60 * If a ThebesLayer doesn't call GetThebesLayerUpdates, then all the | |
| 61 * ReadbackLayers that needed data from that ThebesLayer will be marked | |
| 62 * as having unknown backgrounds. | |
| 63 * @param aUpdateRegion if non-null, this region is set to the union | |
| 64 * of the mUpdateRects. | |
| 65 */ | |
| 66 void GetThebesLayerUpdates(ThebesLayer* aLayer, | |
| 67 nsTArray<Update>* aUpdates, | |
| 68 nsIntRegion* aUpdateRegion = nullptr); | |
| 69 | |
| 70 ~ReadbackProcessor(); | |
| 71 | |
| 72 protected: | |
| 73 void BuildUpdatesForLayer(ReadbackLayer* aLayer); | |
| 74 | |
| 75 nsTArray<Update> mAllUpdates; | |
| 76 }; | |
| 77 | |
| 78 } | |
| 79 } | |
| 80 #endif /* GFX_READBACKPROCESSOR_H */ |
