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
|
// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/accelerated_widget_mac/ca_transaction_observer.h"
#import <AppKit/AppKit.h>
#import <CoreFoundation/CoreFoundation.h>
#import <QuartzCore/QuartzCore.h>
#include <algorithm>
#include "base/no_destructor.h"
#include "base/time/default_tick_clock.h"
#include "base/trace_event/trace_event.h"
#include "ui/accelerated_widget_mac/window_resize_helper_mac.h"
typedef NS_ENUM(unsigned int, CATransactionPhase) {
kCATransactionPhasePreLayout,
kCATransactionPhasePreCommit,
kCATransactionPhasePostCommit,
};
@interface CATransaction ()
+ (void)addCommitHandler:(void (^)(void))block
forPhase:(CATransactionPhase)phase;
@end
namespace ui {
namespace {
NSString* kRunLoopMode = @"Chrome CATransactionCoordinator commit handler";
constexpr auto kPostCommitTimeout = base::Milliseconds(50);
} // namespace
CATransactionCoordinator& CATransactionCoordinator::Get() {
static base::NoDestructor<CATransactionCoordinator> instance;
return *instance;
}
void CATransactionCoordinator::SynchronizeImpl() {
static bool registeredRunLoopMode = false;
if (!registeredRunLoopMode) {
CFRunLoopAddCommonMode(CFRunLoopGetCurrent(),
static_cast<CFStringRef>(kRunLoopMode));
registeredRunLoopMode = true;
}
if (active_)
return;
active_ = true;
for (auto& observer : post_commit_observers_)
observer->OnActivateForTransaction();
[CATransaction addCommitHandler:^{
PreCommitHandler();
}
forPhase:kCATransactionPhasePreCommit];
[CATransaction addCommitHandler:^{
PostCommitHandler();
}
forPhase:kCATransactionPhasePostCommit];
}
void CATransactionCoordinator::PreCommitHandler() {
TRACE_EVENT0("ui", "CATransactionCoordinator: pre-commit handler");
auto* clock = base::DefaultTickClock::GetInstance();
const base::TimeTicks start_time = clock->NowTicks();
while (true) {
bool continue_waiting = false;
base::TimeTicks deadline = start_time;
for (auto& observer : pre_commit_observers_) {
if (observer.ShouldWaitInPreCommit()) {
continue_waiting = true;
deadline = std::max(deadline, start_time + observer.PreCommitTimeout());
}
}
if (!continue_waiting)
break; // success
base::TimeDelta time_left = deadline - clock->NowTicks();
if (time_left <= base::Seconds(0))
break; // timeout
ui::WindowResizeHelperMac::Get()->WaitForSingleTaskToRun(time_left);
}
}
void CATransactionCoordinator::PostCommitHandler() {
TRACE_EVENT0("ui", "CATransactionCoordinator: post-commit handler");
for (auto& observer : post_commit_observers_)
observer->OnEnterPostCommit();
auto* clock = base::DefaultTickClock::GetInstance();
const base::TimeTicks deadline = clock->NowTicks() + kPostCommitTimeout;
while (true) {
bool continue_waiting = std::ranges::any_of(
post_commit_observers_, &PostCommitObserver::ShouldWaitInPostCommit);
if (!continue_waiting)
break; // success
base::TimeDelta time_left = deadline - clock->NowTicks();
if (time_left <= base::Seconds(0))
break; // timeout
ui::WindowResizeHelperMac::Get()->WaitForSingleTaskToRun(time_left);
}
active_ = false;
}
CATransactionCoordinator::CATransactionCoordinator() = default;
CATransactionCoordinator::~CATransactionCoordinator() = default;
void CATransactionCoordinator::Synchronize() {
if (disabled_for_testing_)
return;
SynchronizeImpl();
}
void CATransactionCoordinator::AddPreCommitObserver(
PreCommitObserver* observer) {
pre_commit_observers_.AddObserver(observer);
}
void CATransactionCoordinator::RemovePreCommitObserver(
PreCommitObserver* observer) {
pre_commit_observers_.RemoveObserver(observer);
}
void CATransactionCoordinator::AddPostCommitObserver(
scoped_refptr<PostCommitObserver> observer) {
DCHECK(!post_commit_observers_.count(observer));
post_commit_observers_.insert(std::move(observer));
}
void CATransactionCoordinator::RemovePostCommitObserver(
scoped_refptr<PostCommitObserver> observer) {
DCHECK(post_commit_observers_.count(observer));
post_commit_observers_.erase(std::move(observer));
}
} // namespace ui
|
