gfx/layers/ReadbackProcessor.h@6474c204b198 (annotated)
gfx/layers/ReadbackProcessor.h
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- |
| michael@0 | 2 | * This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 3 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 4 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 5 | |
| michael@0 | 6 | #ifndef GFX_READBACKPROCESSOR_H |
| michael@0 | 7 | #define GFX_READBACKPROCESSOR_H |
| michael@0 | 8 | |
| michael@0 | 9 | #include <stdint.h> // for uint64_t |
| michael@0 | 10 | #include "nsRect.h" // for nsIntRect |
| michael@0 | 11 | #include "nsTArray.h" // for nsTArray |
| michael@0 | 12 | |
| michael@0 | 13 | class nsIntRegion; |
| michael@0 | 14 | |
| michael@0 | 15 | namespace mozilla { |
| michael@0 | 16 | namespace layers { |
| michael@0 | 17 | |
| michael@0 | 18 | class ContainerLayer; |
| michael@0 | 19 | class ReadbackLayer; |
| michael@0 | 20 | class ThebesLayer; |
| michael@0 | 21 | |
| michael@0 | 22 | class ReadbackProcessor { |
| michael@0 | 23 | public: |
| michael@0 | 24 | /** |
| michael@0 | 25 | * Called by the container before processing any child layers. Call this |
| michael@0 | 26 | * if any child layer might have changed in any way (other than content-only |
| michael@0 | 27 | * changes to layers other than ColorLayers and ThebesLayers). |
| michael@0 | 28 | * |
| michael@0 | 29 | * This method recomputes the relationship between ReadbackLayers and |
| michael@0 | 30 | * sibling layers, and dispatches changes to ReadbackLayers. Except that |
| michael@0 | 31 | * if a ThebesLayer needs its contents sent to some ReadbackLayer, we'll |
| michael@0 | 32 | * just record that internally and later the ThebesLayer should call |
| michael@0 | 33 | * GetThebesLayerUpdates when it paints, to find out which rectangle needs |
| michael@0 | 34 | * to be sent, and the ReadbackLayer it needs to be sent to. |
| michael@0 | 35 | */ |
| michael@0 | 36 | void BuildUpdates(ContainerLayer* aContainer); |
| michael@0 | 37 | |
| michael@0 | 38 | struct Update { |
| michael@0 | 39 | /** |
| michael@0 | 40 | * The layer a ThebesLayer should send its contents to. |
| michael@0 | 41 | */ |
| michael@0 | 42 | ReadbackLayer* mLayer; |
| michael@0 | 43 | /** |
| michael@0 | 44 | * The rectangle of content that it should send, in the ThebesLayer's |
| michael@0 | 45 | * coordinate system. This rectangle is guaranteed to be in the ThebesLayer's |
| michael@0 | 46 | * visible region. Translate it to mLayer's coordinate system |
| michael@0 | 47 | * by adding mLayer->GetBackgroundLayerOffset(). |
| michael@0 | 48 | */ |
| michael@0 | 49 | nsIntRect mUpdateRect; |
| michael@0 | 50 | /** |
| michael@0 | 51 | * The sequence counter value to use when calling DoUpdate |
| michael@0 | 52 | */ |
| michael@0 | 53 | uint64_t mSequenceCounter; |
| michael@0 | 54 | }; |
| michael@0 | 55 | /** |
| michael@0 | 56 | * Appends any ReadbackLayers that need to be updated, and the rects that |
| michael@0 | 57 | * need to be updated, to aUpdates. Only need to call this for ThebesLayers |
| michael@0 | 58 | * that have been marked UsedForReadback(). |
| michael@0 | 59 | * Each Update's mLayer's mBackgroundLayer will have been set to aLayer. |
| michael@0 | 60 | * If a ThebesLayer doesn't call GetThebesLayerUpdates, then all the |
| michael@0 | 61 | * ReadbackLayers that needed data from that ThebesLayer will be marked |
| michael@0 | 62 | * as having unknown backgrounds. |
| michael@0 | 63 | * @param aUpdateRegion if non-null, this region is set to the union |
| michael@0 | 64 | * of the mUpdateRects. |
| michael@0 | 65 | */ |
| michael@0 | 66 | void GetThebesLayerUpdates(ThebesLayer* aLayer, |
| michael@0 | 67 | nsTArray<Update>* aUpdates, |
| michael@0 | 68 | nsIntRegion* aUpdateRegion = nullptr); |
| michael@0 | 69 | |
| michael@0 | 70 | ~ReadbackProcessor(); |
| michael@0 | 71 | |
| michael@0 | 72 | protected: |
| michael@0 | 73 | void BuildUpdatesForLayer(ReadbackLayer* aLayer); |
| michael@0 | 74 | |
| michael@0 | 75 | nsTArray<Update> mAllUpdates; |
| michael@0 | 76 | }; |
| michael@0 | 77 | |
| michael@0 | 78 | } |
| michael@0 | 79 | } |
| michael@0 | 80 | #endif /* GFX_READBACKPROCESSOR_H */ |
