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ca_transaction_observer.mm
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ca_transaction_observer.mm
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// Copyright 2018 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 "ui/accelerated_widget_mac/ca_transaction_observer.h"
#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"
#import <AppKit/AppKit.h>
#import <CoreFoundation/CoreFoundation.h>
#import <QuartzCore/QuartzCore.h>
typedef enum {
kCATransactionPhasePreLayout,
kCATransactionPhasePreCommit,
kCATransactionPhasePostCommit,
} CATransactionPhase;
API_AVAILABLE(macos(10.11))
@interface CATransaction ()
+ (void)addCommitHandler:(void (^)(void))block
forPhase:(CATransactionPhase)phase;
@end
namespace ui {
namespace {
NSString* kRunLoopMode = @"Chrome CATransactionCoordinator commit handler";
constexpr auto kPostCommitTimeout = base::TimeDelta::FromMilliseconds(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::TimeDelta::FromSeconds(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::any_of(
post_commit_observers_.begin(), post_commit_observers_.end(),
std::mem_fn(&PostCommitObserver::ShouldWaitInPostCommit));
if (!continue_waiting)
break; // success
base::TimeDelta time_left = deadline - clock->NowTicks();
if (time_left <= base::TimeDelta::FromSeconds(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;
if (@available(macos 10.11, *))
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