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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 #include "components/viz/service/hit_test/hit_test_aggregator.h" | |
6 #include "components/viz/common/display_hit_test_region.h" | |
7 | |
8 namespace viz { | |
9 namespace hit_test { | |
10 | |
11 namespace { | |
12 // TODO(gklassen): Review and select appropriate sizes based on | |
13 // telemetry / UMA. | |
14 constexpr int kInitialSize = 1024; | |
15 constexpr int kIncrementalSize = 1024; | |
16 constexpr int kMaxRegionsPerSurface = 1024; | |
17 constexpr int kMaxSize = 100 * 1024; | |
18 | |
19 bool ValidateHitTestRegion( | |
20 const hit_test::mojom::HitTestRegionPtr& hit_test_region) { | |
21 if (hit_test_region->flags == hit_test::mojom::kHitTestChildSurface) { | |
22 if (!hit_test_region->surface_id.is_valid()) | |
23 return false; | |
24 } | |
25 | |
26 return true; | |
27 } | |
varkha
2017/06/28 19:20:38
nit: ws
gklassen
2017/06/29 11:56:26
Done.
| |
28 bool ValidateHitTestRegionList( | |
29 const hit_test::mojom::HitTestRegionListPtr& hit_test_region_list) { | |
30 if (hit_test_region_list->regions.size() > kMaxRegionsPerSurface) | |
31 return false; | |
32 for (auto& region : hit_test_region_list->regions) { | |
33 if (!ValidateHitTestRegion(region)) | |
34 return false; | |
35 } | |
36 return true; | |
37 } | |
38 | |
39 } // namespace | |
40 | |
41 HitTestAggregator::HitTestAggregator() | |
42 : active_region_count_(0), weak_ptr_factory_(this) { | |
43 AllocateDisplayHitTestRegionList(); | |
44 } | |
varkha
2017/06/28 19:20:38
ditto
gklassen
2017/06/29 11:56:26
Done.
| |
45 HitTestAggregator::~HitTestAggregator() {} | |
46 | |
47 void HitTestAggregator::SubmitHitTestRegionList( | |
48 hit_test::mojom::HitTestRegionListPtr hit_test_region_list) { | |
49 DCHECK(ValidateHitTestRegionList(hit_test_region_list)); | |
50 // TODO(gklassen): Runtime validation that hit_test_region_list is valid. | |
51 // TODO(gklassen): Inform FrameSink that the hit_test_region_list is invalid. | |
52 // TODO(gklassen): FrameSink needs to inform the host of a difficult renderer. | |
53 pending_[hit_test_region_list->surface_id] = std::move(hit_test_region_list); | |
54 } | |
55 | |
56 bool HitTestAggregator::OnSurfaceDamaged(const cc::SurfaceId& surface_id, | |
57 const cc::BeginFrameAck& ack) { | |
58 return false; | |
59 } | |
60 | |
61 void HitTestAggregator::OnSurfaceDiscarded(const cc::SurfaceId& surface_id) { | |
62 pending_.erase(surface_id); | |
63 active_.erase(surface_id); | |
64 } | |
65 | |
66 void HitTestAggregator::OnSurfaceWillDraw(const cc::SurfaceId& surface_id) { | |
67 auto pending_search = pending_.find(surface_id); | |
68 if (pending_search == pending_.end()) { | |
69 // Have already activated pending hit_test_region_list objects for this | |
70 // surface. | |
71 return; | |
72 } | |
73 hit_test::mojom::HitTestRegionList* hit_test_region_list = | |
74 pending_search->second.get(); | |
75 | |
76 // Update the region count. | |
77 auto active_search = active_.find(surface_id); | |
78 if (active_search != active_.end()) { | |
79 hit_test::mojom::HitTestRegionList* old_hit_test_data = | |
80 active_search->second.get(); | |
81 active_region_count_ -= old_hit_test_data->regions.size(); | |
82 } | |
83 active_region_count_ += hit_test_region_list->regions.size(); | |
84 DCHECK_GE(active_region_count_, 0); | |
85 | |
86 active_[surface_id] = std::move(pending_[surface_id]); | |
87 pending_.erase(surface_id); | |
88 } | |
89 | |
90 void HitTestAggregator::AllocateDisplayHitTestRegionList() { | |
91 AllocateDisplayHitTestRegionList(kInitialSize); | |
92 Swap(); | |
93 AllocateDisplayHitTestRegionList(kInitialSize); | |
94 } | |
95 | |
96 void HitTestAggregator::AllocateDisplayHitTestRegionList(int size) { | |
97 size_t num_bytes = size * sizeof(DisplayHitTestRegion); | |
98 write_handle_ = mojo::SharedBufferHandle::Create(num_bytes); | |
99 write_size_ = size; | |
100 write_buffer_ = write_handle_->Map(num_bytes); | |
101 | |
102 DisplayHitTestRegion* region = (DisplayHitTestRegion*)write_buffer_.get(); | |
103 region[0].child_count = kEndOfList; | |
104 } | |
105 | |
106 void HitTestAggregator::PostTaskAggregate(cc::SurfaceId display_surface_id) { | |
107 base::ThreadTaskRunnerHandle::Get()->PostTask( | |
108 FROM_HERE, | |
109 base::BindOnce(&HitTestAggregator::Aggregate, | |
110 weak_ptr_factory_.GetWeakPtr(), display_surface_id)); | |
111 } | |
112 | |
113 void HitTestAggregator::Aggregate(cc::SurfaceId display_surface_id) { | |
114 // Size check. | |
varkha
2017/06/28 19:20:38
nit: comments need to be complete sentences.
gklassen
2017/06/29 11:56:26
Done.
| |
115 int size = write_size_; | |
116 int max_size = active_region_count_ + active_.size() + 1; | |
117 if (max_size > kMaxSize) | |
118 max_size = kMaxSize; | |
119 | |
120 if (max_size > size) { | |
121 size = (1 + max_size / kIncrementalSize) * kIncrementalSize; | |
122 AllocateDisplayHitTestRegionList(size); | |
123 } | |
124 | |
125 AppendRoot(display_surface_id); | |
126 } | |
127 | |
128 void HitTestAggregator::AppendRoot(cc::SurfaceId surface_id) { | |
129 auto search = active_.find(surface_id); | |
130 CHECK(search != active_.end()); | |
131 | |
132 hit_test::mojom::HitTestRegionList* hit_test_region_list = | |
133 search->second.get(); | |
134 | |
135 DisplayHitTestRegion* regions = (DisplayHitTestRegion*)write_buffer_.get(); | |
136 | |
137 regions[0].frame_sink_id = hit_test_region_list->surface_id.frame_sink_id(); | |
138 regions[0].flags = hit_test_region_list->flags; | |
139 regions[0].rect = hit_test_region_list->bounds; | |
140 regions[0].transform = hit_test_region_list->transform; | |
141 | |
142 int index = 1; | |
143 for (auto& region : hit_test_region_list->regions) | |
144 index = AppendRegion(regions, region, index); | |
145 | |
146 DCHECK_GE(index, 1); | |
147 regions[0].child_count = index - 1; | |
148 regions[index].child_count = kEndOfList; | |
149 } | |
150 | |
151 int HitTestAggregator::AppendRegion( | |
152 DisplayHitTestRegion* regions, | |
153 const hit_test::mojom::HitTestRegionPtr& region, | |
154 int index) { | |
155 DisplayHitTestRegion* element = ®ions[index]; | |
156 | |
157 element->frame_sink_id = region->surface_id.frame_sink_id(); | |
158 element->flags = region->flags; | |
159 element->rect = region->rect; | |
160 element->transform = region->transform; | |
161 | |
162 int parent_index = index++; | |
163 | |
164 if (region->flags == hit_test::mojom::kHitTestChildSurface) { | |
165 auto search = active_.find(region->surface_id); | |
166 if (search == active_.end()) { | |
167 // Surface HitTestRegionList not found - it may be late. | |
168 // Don't include this region so that it doesn't receive events. | |
169 return parent_index; | |
170 } | |
171 | |
172 // Rather than add a node in the tree for this hit_test_region_list element | |
173 // we can simplify the tree by merging the flags and transform into | |
174 // the kHitTestChildSurface element. | |
175 hit_test::mojom::HitTestRegionList* hit_test_region_list = | |
176 search->second.get(); | |
177 if (!hit_test_region_list->transform.IsIdentity()) | |
178 element->transform.PreconcatTransform(hit_test_region_list->transform); | |
179 | |
180 element->flags |= hit_test_region_list->flags; | |
181 | |
182 for (auto& child_region : hit_test_region_list->regions) { | |
183 if (index < write_size_ - 1) | |
184 index = AppendRegion(regions, child_region, index); | |
185 } | |
186 } | |
187 DCHECK_GE(index - parent_index - 1, 0); | |
188 element->child_count = index - parent_index - 1; | |
189 return index; | |
190 } | |
191 | |
192 void HitTestAggregator::Swap() { | |
193 std::swap(read_handle_, write_handle_); | |
194 std::swap(read_size_, write_size_); | |
195 std::swap(read_buffer_, write_buffer_); | |
196 } | |
197 | |
198 } // namespace hit_test | |
199 } // namespace viz | |
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