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1 // Copyright 2017 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef COMPONENTS_VIZ_SERVICE_HIT_TEST_HIT_TEST_AGGREGATOR_H_ | |
6 #define COMPONENTS_VIZ_SERVICE_HIT_TEST_HIT_TEST_AGGREGATOR_H_ | |
7 | |
8 #include "cc/surfaces/surface_observer.h" | |
9 #include "components/viz/common/hit_test/aggregated_hit_test_region.h" | |
10 #include "components/viz/common/surface_id.h" | |
11 #include "components/viz/service/viz_service_export.h" | |
12 #include "services/viz/public/interfaces/hit_test_region_list.mojom.h" | |
13 | |
14 namespace viz { | |
15 | |
16 class HitTestAggregatorTest; | |
17 | |
18 // HitTestAggregator collects HitTestRegionList objects from surfaces and | |
19 // aggregates them into a DisplayHitTesData structue made available in | |
20 // shared memory to enable efficient hit testing across processes. | |
21 // | |
22 // This is intended to be created in the viz or GPU process. For mus+ash this | |
23 // will be true after the mus process split. | |
24 class VIZ_SERVICE_EXPORT HitTestAggregator : public cc::SurfaceObserver { | |
25 public: | |
26 HitTestAggregator(); | |
27 ~HitTestAggregator(); | |
28 | |
29 // Called when HitTestRegionList is submitted along with every call | |
30 // to SubmitCompositorFrame. This is collected in pending_ until | |
31 // surfaces are aggregated and put on the display. | |
32 void SubmitHitTestRegionList( | |
33 mojom::HitTestRegionListPtr hit_test_region_list); | |
34 | |
35 // Called after surfaces have been aggregated into the DisplayFrame. | |
36 // In this call HitTestRegionList structures received from active surfaces | |
37 // are aggregated into the HitTestRegionList structure in | |
38 // shared memory used for event targetting. | |
39 void Aggregate(SurfaceId display_surface_id); | |
40 | |
41 // Performs the work of Aggregate by creating a PostTask so that | |
42 // the work is not directly on the call. | |
43 void PostTaskAggregate(SurfaceId display_surface_id); | |
44 | |
45 // Called at BeginFrame. Swaps buffers in shared memory. | |
46 void Swap(); | |
47 | |
48 private: | |
49 friend class HitTestAggregatorTest; | |
50 | |
51 // Allocates memory for the AggregatedHitTestRegion array. | |
52 void AllocateHitTestRegionArray(); | |
53 void AllocateHitTestRegionArray(int length); | |
54 | |
55 // Appends the root element to the AggregatedHitTestRegion array. | |
56 void AppendRoot(SurfaceId surface_id); | |
57 | |
58 // Appends a region to the HitTestRegionList structure to recursively | |
59 // build the tree. | |
60 int AppendRegion(AggregatedHitTestRegion* regions, | |
61 int region_index, | |
62 const mojom::HitTestRegionPtr& region); | |
63 | |
64 // cc::SurfaceObserver: | |
65 void OnSurfaceCreated(const cc::SurfaceInfo& surface_info) override {} | |
66 void OnSurfaceDestroyed(const SurfaceId& surface_id) override {} | |
67 bool OnSurfaceDamaged(const SurfaceId& surface_id, | |
68 const cc::BeginFrameAck& ack) override; | |
69 void OnSurfaceDiscarded(const SurfaceId& surface_id) override; | |
70 void OnSurfaceDamageExpected(const SurfaceId& surface_id, | |
71 const cc::BeginFrameArgs& args) override {} | |
72 | |
73 // Called when a surface has been aggregated and added to the | |
74 // display frame. HitTestRegionList objects are held but ignored until | |
75 // this happens. HitTestRegionList for the surface is copied from |pending_| | |
76 // to |active_| in this method. | |
77 void OnSurfaceWillDraw(const SurfaceId& surface_id) override; | |
78 | |
79 // The collection of received HitTestRegionList objects that have not yet | |
80 // been added to the DisplayFrame (OnSurfaceWillDraw has not been called). | |
81 std::map<SurfaceId, mojom::HitTestRegionListPtr> pending_; | |
82 | |
83 // The collection of HitTestRegionList objects that have been added to the | |
84 // DisplayFrame (OnSurfaceWillDraw has been called). | |
85 std::map<SurfaceId, mojom::HitTestRegionListPtr> active_; | |
86 | |
87 // Keeps track of the number of regions in the active list | |
88 // so that we know when we exceed the available length. | |
89 int active_region_count_ = 0; | |
90 | |
91 mojo::ScopedSharedBufferHandle read_handle_; | |
92 mojo::ScopedSharedBufferHandle write_handle_; | |
93 | |
94 // The number of elements allocated. | |
95 int read_size_; | |
danakj
2017/07/14 15:27:37
Can you init these?
gklassen
2017/07/14 16:54:45
Done.
| |
96 int write_size_; | |
97 | |
98 mojo::ScopedSharedBufferMapping read_buffer_; | |
99 mojo::ScopedSharedBufferMapping write_buffer_; | |
100 | |
101 // Handles the case when this object is deleted after | |
102 // the PostTaskAggregation call is scheduled but before invocation. | |
103 base::WeakPtrFactory<HitTestAggregator> weak_ptr_factory_; | |
104 | |
105 DISALLOW_COPY_AND_ASSIGN(HitTestAggregator); | |
106 }; | |
107 | |
108 } // namespace viz | |
109 | |
110 #endif // COMPONENTS_VIZ_SERVICE_HIT_TEST_HIT_TEST_AGGREGATOR_H_ | |
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