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1 // Copyright 2015 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 "cc/surfaces/display_scheduler.h" | |
6 | |
7 #include <vector> | |
8 | |
9 #include "base/stl_util.h" | |
10 #include "base/trace_event/trace_event.h" | |
11 #include "cc/output/output_surface.h" | |
12 #include "ui/gfx/frame_time.h" | |
13 | |
14 namespace cc { | |
15 | |
16 DisplayScheduler::DisplayScheduler( | |
17 DisplaySchedulerClient* client, | |
18 BeginFrameSource* begin_frame_source, | |
19 scoped_refptr<base::SingleThreadTaskRunner> task_runner, | |
20 int max_pending_swaps) | |
21 : client_(client), | |
22 begin_frame_source_(begin_frame_source), | |
23 task_runner_(task_runner), | |
24 output_surface_lost_(false), | |
25 resources_locked_by_browser_(true), | |
26 inside_begin_frame_deadline_interval_(false), | |
27 needs_draw_(false), | |
28 entire_display_damaged_(false), | |
29 all_active_surfaces_ready_to_draw_(false), | |
30 pending_swaps_(0), | |
31 max_pending_swaps_(max_pending_swaps), | |
32 weak_ptr_factory_(this) { | |
33 begin_frame_source_->AddObserver(this); | |
34 begin_frame_deadline_closure_ = base::Bind( | |
35 &DisplayScheduler::OnBeginFrameDeadline, weak_ptr_factory_.GetWeakPtr()); | |
36 } | |
37 | |
38 DisplayScheduler::~DisplayScheduler() { | |
39 begin_frame_source_->RemoveObserver(this); | |
40 } | |
41 | |
42 // If we try to draw when the Browser has locked it's resources, the | |
43 // draw will fail. | |
44 void DisplayScheduler::SetResourcesLockedByBrowser(bool locked) { | |
45 resources_locked_by_browser_ = locked; | |
46 ScheduleBeginFrameDeadline(); | |
47 } | |
48 | |
49 // Notification that there was a resize or the root surface changed and | |
50 // that we should just draw immediately. | |
51 void DisplayScheduler::EntireDisplayDamaged() { | |
52 TRACE_EVENT0("cc", "DisplayScheduler::EntireDisplayDamaged"); | |
53 needs_draw_ = true; | |
54 entire_display_damaged_ = true; | |
55 | |
56 begin_frame_source_->SetNeedsBeginFrames(!output_surface_lost_); | |
57 ScheduleBeginFrameDeadline(); | |
58 } | |
59 | |
60 // Indicates that there was damage to one of the surfaces. | |
61 // Has some logic to wait for multiple active surfaces before | |
62 // triggering the deadline. | |
63 void DisplayScheduler::SurfaceDamaged(SurfaceId surface_id) { | |
64 TRACE_EVENT1("cc", "DisplayScheduler::SurfaceDamaged", "surface_id", | |
65 surface_id.id); | |
66 | |
67 needs_draw_ = true; | |
68 | |
69 surface_ids_damaged_.insert(surface_id); | |
70 | |
71 // TODO(mithro): Use hints from SetNeedsBeginFrames. | |
72 all_active_surfaces_ready_to_draw_ = base::STLIncludes( | |
73 surface_ids_damaged_, surface_ids_to_expect_damage_from_); | |
74 | |
75 begin_frame_source_->SetNeedsBeginFrames(!output_surface_lost_); | |
76 ScheduleBeginFrameDeadline(); | |
77 } | |
78 | |
79 void DisplayScheduler::OutputSurfaceLost() { | |
80 TRACE_EVENT0("cc", "DisplayScheduler::OutputSurfaceLost"); | |
81 output_surface_lost_ = true; | |
82 begin_frame_source_->SetNeedsBeginFrames(false); | |
83 ScheduleBeginFrameDeadline(); | |
84 } | |
85 | |
86 void DisplayScheduler::DrawAndSwap() { | |
87 TRACE_EVENT0("cc", "DisplayScheduler::DrawAndSwap"); | |
88 DCHECK_LT(pending_swaps_, max_pending_swaps_); | |
89 DCHECK(!output_surface_lost_); | |
90 | |
91 bool success = client_->DrawAndSwap(); | |
92 if (!success) | |
93 return; | |
94 | |
95 needs_draw_ = false; | |
96 entire_display_damaged_ = false; | |
97 all_active_surfaces_ready_to_draw_ = false; | |
98 | |
99 surface_ids_to_expect_damage_from_ = | |
100 base::STLSetIntersection<std::vector<SurfaceId>>( | |
101 surface_ids_damaged_, surface_ids_damaged_prev_); | |
102 | |
103 surface_ids_damaged_prev_.swap(surface_ids_damaged_); | |
104 surface_ids_damaged_.clear(); | |
105 } | |
106 | |
107 bool DisplayScheduler::OnBeginFrameMixInDelegate(const BeginFrameArgs& args) { | |
108 TRACE_EVENT1("cc", "DisplayScheduler::BeginFrame", "args", args.AsValue()); | |
109 | |
110 // If we get another BeginFrame before the previous deadline, | |
111 // synchronously trigger the previous deadline before progressing. | |
112 if (inside_begin_frame_deadline_interval_) { | |
113 OnBeginFrameDeadline(); | |
114 } | |
115 | |
116 // Schedule the deadline. | |
117 current_begin_frame_args_ = args; | |
118 current_begin_frame_args_.deadline -= | |
119 BeginFrameArgs::DefaultEstimatedParentDrawTime(); | |
120 inside_begin_frame_deadline_interval_ = true; | |
121 ScheduleBeginFrameDeadline(); | |
122 | |
123 return true; | |
124 } | |
125 | |
126 base::TimeTicks DisplayScheduler::DesiredBeginFrameDeadlineTime() { | |
127 if (output_surface_lost_) { | |
128 TRACE_EVENT_INSTANT0("cc", "Lost output surface", TRACE_EVENT_SCOPE_THREAD); | |
129 return base::TimeTicks(); | |
130 } | |
131 | |
132 if (!needs_draw_) { | |
133 TRACE_EVENT_INSTANT0("cc", "No damage yet", TRACE_EVENT_SCOPE_THREAD); | |
134 return current_begin_frame_args_.frame_time + | |
135 current_begin_frame_args_.interval; | |
136 } | |
137 | |
138 if (pending_swaps_ >= max_pending_swaps_) { | |
139 TRACE_EVENT_INSTANT0("cc", "Swap throttled", TRACE_EVENT_SCOPE_THREAD); | |
140 return current_begin_frame_args_.frame_time + | |
141 current_begin_frame_args_.interval; | |
142 } | |
143 | |
144 if (resources_locked_by_browser_) { | |
145 TRACE_EVENT_INSTANT0("cc", "Resources locked by Browser", | |
146 TRACE_EVENT_SCOPE_THREAD); | |
147 return current_begin_frame_args_.frame_time + | |
148 current_begin_frame_args_.interval; | |
149 } | |
150 | |
151 // TODO(mithro): Be smarter about resize deadlines. | |
152 if (entire_display_damaged_) { | |
153 TRACE_EVENT_INSTANT0("cc", "Entire display damaged", | |
154 TRACE_EVENT_SCOPE_THREAD); | |
155 return base::TimeTicks(); | |
156 } | |
157 | |
158 if (all_active_surfaces_ready_to_draw_) { | |
159 TRACE_EVENT_INSTANT0("cc", "Active surfaces ready", | |
160 TRACE_EVENT_SCOPE_THREAD); | |
161 return base::TimeTicks(); | |
162 } | |
163 | |
164 TRACE_EVENT_INSTANT0("cc", "More damage expected soon", | |
165 TRACE_EVENT_SCOPE_THREAD); | |
166 return current_begin_frame_args_.deadline; | |
167 } | |
168 | |
169 void DisplayScheduler::ScheduleBeginFrameDeadline() { | |
170 TRACE_EVENT0("cc", "DisplayScheduler::ScheduleBeginFrameDeadline"); | |
171 | |
172 // We need to wait for the next BeginFrame before scheduling a deadline. | |
173 if (!inside_begin_frame_deadline_interval_) { | |
174 TRACE_EVENT_INSTANT0("cc", "Waiting for next BeginFrame", | |
175 TRACE_EVENT_SCOPE_THREAD); | |
176 DCHECK(begin_frame_deadline_task_.IsCancelled()); | |
177 return; | |
178 } | |
179 | |
180 // Determine the deadline we want to use. | |
181 base::TimeTicks desired_deadline = DesiredBeginFrameDeadlineTime(); | |
182 | |
183 // Avoid re-scheduling the deadline if it's already correctly scheduled. | |
184 if (!begin_frame_deadline_task_.IsCancelled() && | |
185 desired_deadline == begin_frame_deadline_task_time_) | |
186 return; | |
187 | |
188 // Schedule the deadline. | |
189 begin_frame_deadline_task_time_ = desired_deadline; | |
190 begin_frame_deadline_task_.Cancel(); | |
191 begin_frame_deadline_task_.Reset(begin_frame_deadline_closure_); | |
192 | |
193 base::TimeDelta delta = | |
194 std::max(base::TimeDelta(), desired_deadline - base::TimeTicks::Now()); | |
195 task_runner_->PostDelayedTask(FROM_HERE, | |
196 begin_frame_deadline_task_.callback(), delta); | |
197 } | |
198 | |
199 void DisplayScheduler::OnBeginFrameDeadline() { | |
200 TRACE_EVENT0("cc", "DisplayScheduler::OnBeginFrameDeadline"); | |
201 inside_begin_frame_deadline_interval_ = false; | |
202 begin_frame_deadline_task_.Cancel(); | |
203 begin_frame_deadline_task_time_ = base::TimeTicks(); | |
204 | |
205 if (needs_draw_ && !output_surface_lost_) { | |
206 if (pending_swaps_ < max_pending_swaps_ && !resources_locked_by_browser_) | |
207 DrawAndSwap(); | |
208 } else { | |
209 begin_frame_source_->SetNeedsBeginFrames(false); | |
210 } | |
211 | |
212 begin_frame_source_->DidFinishFrame(0); | |
213 } | |
214 | |
215 void DisplayScheduler::DidSwapBuffers() { | |
216 pending_swaps_++; | |
217 TRACE_EVENT1("cc", "DisplayScheduler::DidSwapBuffers", "pending_frames", | |
218 pending_swaps_); | |
219 } | |
220 | |
221 void DisplayScheduler::DidSwapBuffersComplete() { | |
222 pending_swaps_--; | |
223 TRACE_EVENT1("cc", "DisplayScheduler::DidSwapBuffersComplete", | |
224 "pending_frames", pending_swaps_); | |
225 ScheduleBeginFrameDeadline(); | |
226 } | |
227 | |
228 } // namespace cc | |
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