1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
|
// Copyright 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/scheduler/scheduler.h"
#include "base/auto_reset.h"
#include "base/debug/trace_event.h"
#include "base/logging.h"
namespace cc {
Scheduler::Scheduler(SchedulerClient* client,
const SchedulerSettings& scheduler_settings)
: settings_(scheduler_settings),
client_(client),
weak_factory_(this),
last_set_needs_begin_frame_(false),
has_pending_begin_frame_(false),
safe_to_expect_begin_frame_(false),
state_machine_(scheduler_settings),
inside_process_scheduled_actions_(false) {
DCHECK(client_);
DCHECK(!state_machine_.BeginFrameNeededToDrawByImplThread());
}
Scheduler::~Scheduler() {
client_->SetNeedsBeginFrameOnImplThread(false);
}
void Scheduler::SetCanStart() {
state_machine_.SetCanStart();
ProcessScheduledActions();
}
void Scheduler::SetVisible(bool visible) {
state_machine_.SetVisible(visible);
ProcessScheduledActions();
}
void Scheduler::SetCanDraw(bool can_draw) {
state_machine_.SetCanDraw(can_draw);
ProcessScheduledActions();
}
void Scheduler::SetHasPendingTree(bool has_pending_tree) {
state_machine_.SetHasPendingTree(has_pending_tree);
ProcessScheduledActions();
}
void Scheduler::SetNeedsCommit() {
state_machine_.SetNeedsCommit();
ProcessScheduledActions();
}
void Scheduler::SetNeedsForcedCommit() {
state_machine_.SetNeedsCommit();
state_machine_.SetNeedsForcedCommit();
ProcessScheduledActions();
}
void Scheduler::SetNeedsRedraw() {
state_machine_.SetNeedsRedraw();
ProcessScheduledActions();
}
void Scheduler::DidSwapUseIncompleteTile() {
state_machine_.DidSwapUseIncompleteTile();
ProcessScheduledActions();
}
void Scheduler::SetNeedsForcedRedraw() {
state_machine_.SetNeedsForcedRedraw();
ProcessScheduledActions();
}
void Scheduler::SetMainThreadNeedsLayerTextures() {
state_machine_.SetMainThreadNeedsLayerTextures();
ProcessScheduledActions();
}
void Scheduler::FinishCommit() {
TRACE_EVENT0("cc", "Scheduler::FinishCommit");
state_machine_.FinishCommit();
ProcessScheduledActions();
}
void Scheduler::BeginFrameAbortedByMainThread() {
TRACE_EVENT0("cc", "Scheduler::BeginFrameAbortedByMainThread");
state_machine_.BeginFrameAbortedByMainThread();
ProcessScheduledActions();
}
void Scheduler::DidLoseOutputSurface() {
TRACE_EVENT0("cc", "Scheduler::DidLoseOutputSurface");
state_machine_.DidLoseOutputSurface();
ProcessScheduledActions();
}
void Scheduler::DidCreateAndInitializeOutputSurface() {
TRACE_EVENT0("cc", "Scheduler::DidCreateAndInitializeOutputSurface");
state_machine_.DidCreateAndInitializeOutputSurface();
has_pending_begin_frame_ = false;
last_set_needs_begin_frame_ = false;
safe_to_expect_begin_frame_ = false;
ProcessScheduledActions();
}
base::TimeTicks Scheduler::AnticipatedDrawTime() {
TRACE_EVENT0("cc", "Scheduler::AnticipatedDrawTime");
if (!last_set_needs_begin_frame_ ||
last_begin_frame_args_.interval <= base::TimeDelta())
return base::TimeTicks();
// TODO(brianderson): Express this in terms of the deadline.
base::TimeTicks now = base::TimeTicks::Now();
int64 intervals = 1 + ((now - last_begin_frame_args_.frame_time) /
last_begin_frame_args_.interval);
return last_begin_frame_args_.frame_time +
(last_begin_frame_args_.interval * intervals);
}
base::TimeTicks Scheduler::LastBeginFrameOnImplThreadTime() {
return last_begin_frame_args_.frame_time;
}
void Scheduler::SetupNextBeginFrameIfNeeded() {
bool needs_begin_frame_to_draw =
state_machine_.BeginFrameNeededToDrawByImplThread();
// We want to avoid proactive begin frames with the synchronous compositor
// because every SetNeedsBeginFrame will force a redraw.
bool proactive_begin_frame_wanted =
state_machine_.ProactiveBeginFrameWantedByImplThread() &&
!settings_.using_synchronous_renderer_compositor;
bool needs_begin_frame = needs_begin_frame_to_draw ||
proactive_begin_frame_wanted;
bool immediate_disables_needed =
settings_.using_synchronous_renderer_compositor;
if (needs_begin_frame_to_draw)
safe_to_expect_begin_frame_ = true;
// Determine if we need BeginFrame notifications.
// If we do, always request the BeginFrame immediately.
// If not, only disable on the next BeginFrame to avoid unnecessary toggles.
// The synchronous renderer compositor requires immediate disables though.
if ((needs_begin_frame ||
state_machine_.inside_begin_frame() ||
immediate_disables_needed) &&
(needs_begin_frame != last_set_needs_begin_frame_)) {
has_pending_begin_frame_ = false;
client_->SetNeedsBeginFrameOnImplThread(needs_begin_frame);
if (safe_to_expect_begin_frame_)
last_set_needs_begin_frame_ = needs_begin_frame;
}
// Request another BeginFrame if we haven't drawn for now until we have
// deadlines implemented.
if (state_machine_.inside_begin_frame() && has_pending_begin_frame_) {
has_pending_begin_frame_ = false;
client_->SetNeedsBeginFrameOnImplThread(true);
return;
}
}
void Scheduler::BeginFrame(const BeginFrameArgs& args) {
TRACE_EVENT0("cc", "Scheduler::BeginFrame");
DCHECK(!has_pending_begin_frame_);
has_pending_begin_frame_ = true;
safe_to_expect_begin_frame_ = true;
last_begin_frame_args_ = args;
state_machine_.DidEnterBeginFrame(args);
ProcessScheduledActions();
state_machine_.DidLeaveBeginFrame();
}
void Scheduler::DrawAndSwapIfPossible() {
ScheduledActionDrawAndSwapResult result =
client_->ScheduledActionDrawAndSwapIfPossible();
state_machine_.DidDrawIfPossibleCompleted(result.did_draw);
if (result.did_swap)
has_pending_begin_frame_ = false;
}
void Scheduler::DrawAndSwapForced() {
ScheduledActionDrawAndSwapResult result =
client_->ScheduledActionDrawAndSwapForced();
if (result.did_swap)
has_pending_begin_frame_ = false;
}
void Scheduler::ProcessScheduledActions() {
// We do not allow ProcessScheduledActions to be recursive.
// The top-level call will iteratively execute the next action for us anyway.
if (inside_process_scheduled_actions_)
return;
base::AutoReset<bool> mark_inside(&inside_process_scheduled_actions_, true);
SchedulerStateMachine::Action action = state_machine_.NextAction();
while (action != SchedulerStateMachine::ACTION_NONE) {
state_machine_.UpdateState(action);
switch (action) {
case SchedulerStateMachine::ACTION_NONE:
break;
case SchedulerStateMachine::ACTION_SEND_BEGIN_FRAME_TO_MAIN_THREAD:
client_->ScheduledActionSendBeginFrameToMainThread();
break;
case SchedulerStateMachine::ACTION_COMMIT:
client_->ScheduledActionCommit();
break;
case SchedulerStateMachine::ACTION_CHECK_FOR_COMPLETED_TILE_UPLOADS:
client_->ScheduledActionCheckForCompletedTileUploads();
break;
case SchedulerStateMachine::ACTION_ACTIVATE_PENDING_TREE_IF_NEEDED:
client_->ScheduledActionActivatePendingTreeIfNeeded();
break;
case SchedulerStateMachine::ACTION_DRAW_IF_POSSIBLE:
DrawAndSwapIfPossible();
break;
case SchedulerStateMachine::ACTION_DRAW_FORCED:
DrawAndSwapForced();
break;
case SchedulerStateMachine::ACTION_BEGIN_OUTPUT_SURFACE_CREATION:
client_->ScheduledActionBeginOutputSurfaceCreation();
break;
case SchedulerStateMachine::ACTION_ACQUIRE_LAYER_TEXTURES_FOR_MAIN_THREAD:
client_->ScheduledActionAcquireLayerTexturesForMainThread();
break;
}
action = state_machine_.NextAction();
}
SetupNextBeginFrameIfNeeded();
client_->DidAnticipatedDrawTimeChange(AnticipatedDrawTime());
}
bool Scheduler::WillDrawIfNeeded() const {
return !state_machine_.DrawSuspendedUntilCommit();
}
} // namespace cc
|
